release 0.4.1

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

.build.yml

@@ -0,0 +1,16 @@
+image: archlinux
+packages:
+  - rust
+  - libpulse
+  - alsa-lib
+  - fontconfig
+  - libxkbcommon
+sources:
+  - https://git.sr.ht/~kennylevinsen/wldash
+tasks:
+  - rustfmt-check: |
+      cd wldash
+      cargo fmt -- --check
+  - build: |
+      cd wldash
+      cargo build

.gitea/workflows/release.yml

@@ -0,0 +1,114 @@
+name: Release
+
+# A `v*` tag builds the package on each architecture's own runner
+# (x86_64 on ergo's bare runner, aarch64 on klokka's) and uploads it
+# to the [uhhm] Arch registry, like uhhm/gdo and bl/djdeck. Hosts then
+# `pacman -S wldash`. The tag has to agree with PKGBUILD's pkgver and
+# Cargo.toml's version, and CHANGELOG.md has to have the section; a
+# release with the tag's notes is created from the x86_64 job.
+
+on:
+  push:
+    tags: ["v*"]
+
+jobs:
+  package:
+    strategy:
+      matrix:
+        include:
+          - arch: x86_64
+            runs-on: bare
+            # The bare runner's shared toolchain and caches, with the
+            # writable cargo home uhhm/iris and uhhm/gdo use.
+            cargo_home: /var/local/cargo-target/iris-cargo-home
+            rustc_wrapper: /usr/bin/sccache
+            rustup_home: /var/local/rustup
+            target_dir: /var/local/cargo-target
+          - arch: aarch64
+            runs-on: aarch64
+            # klokka's host runner: rustup's stable (step below), defaults everywhere.
+            cargo_home: ""
+            rustc_wrapper: ""
+            rustup_home: ""
+            target_dir: ""
+    runs-on: ${{ matrix.runs-on }}
+    env:
+      CARGO_HOME: ${{ matrix.cargo_home }}
+      RUSTC_WRAPPER: ${{ matrix.rustc_wrapper }}
+      RUSTUP_HOME: ${{ matrix.rustup_home }}
+      CARGO_TARGET_DIR: ${{ matrix.target_dir }}
+      PATH: /var/local/cargo/bin:/usr/local/sbin:/usr/local/bin:/usr/bin
+      SCCACHE_DIR: /var/local/sccache
+      SCCACHE_SERVER_PORT: "4228"
+    steps:
+      # v4 built-in checkout: native Go, needs no Node (the aarch64 host runner
+      # has none) and keeps the token out of a fetch URL.
+      - name: Checkout
+        uses: builtin:checkout
+
+      # klokka's runner has rustup but no default toolchain, so its cargo
+      # proxy refuses to run without this.
+      - name: Install Rust stable (aarch64)
+        if: matrix.arch == 'aarch64'
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Check tag matches pkgver and Cargo.toml
+        run: |
+          want="${GITHUB_REF_NAME#v}"
+          have=$(sed -n 's/^pkgver=//p' PKGBUILD)
+          [ "$want" = "$have" ] || { echo "tag $GITHUB_REF_NAME != pkgver $have" >&2; exit 1; }
+          cargo_ver=$(sed -n 's/^version = "\(.*\)"/\1/p' Cargo.toml | head -1)
+          [ "$want" = "$cargo_ver" ] || { echo "tag $GITHUB_REF_NAME != Cargo.toml version $cargo_ver" >&2; exit 1; }
+          notes=$(awk -v v="$want" '/^## /{p = ($2 == v)} p' CHANGELOG.md | tail -n +2)
+          [ -n "$(printf "%s" "$notes" | tr -d "[:space:]")" ] || { echo "CHANGELOG.md has no section for $GITHUB_REF_NAME" >&2; exit 1; }
+
+      # Bare runners are never mutated by CI: wldash's system libraries
+      # (dbus, libpulse, libxkbcommon, fontconfig, wayland) must already be
+      # installed on the host. Fail loud if one is missing.
+      - name: Check system build deps
+        run: |
+          missing=""
+          for lib in dbus-1 libpulse xkbcommon fontconfig wayland-client; do
+            pkg-config --exists "$lib" || missing="$missing $lib"
+          done
+          [ -z "$missing" ] || { echo "::error::bare runner missing:$missing — install once on the host" >&2; exit 1; }
+
+      # -d: cargo is the shared toolchain, not a pacman package the
+      # runner could verify. Builds and tests from the checkout. Empty
+      # env values above are unset here so cargo's defaults apply.
+      - name: Build package
+        run: |
+          for v in CARGO_HOME RUSTC_WRAPPER RUSTUP_HOME CARGO_TARGET_DIR; do
+            eval "[ -n \"\$$v\" ]" || unset "$v"
+          done
+          makepkg -f -d --noconfirm
+
+      # REGISTRY_TOKEN is a write:package token for bl, a secret on this
+      # repo. The registry namespace is always bl: pacman.conf's [uhhm]
+      # points at /api/packages/bl/arch/uhhm. Without the secret the build
+      # still runs so the tag is verified; re-run the job once it is set.
+      - name: Publish to the Arch package registry
+        run: |
+          set -euo pipefail
+          if [ -z "${{ secrets.REGISTRY_TOKEN }}" ]; then
+            echo "::warning::REGISTRY_TOKEN not set — skipping Arch registry publish"
+            exit 0
+          fi
+          for pkg in $(makepkg --packagelist); do
+            echo "==> $pkg"
+            curl --fail-with-body --user "bl:${{ secrets.REGISTRY_TOKEN }}" \
+              --upload-file "$pkg" \
+              "${{ gitea.server_url }}/api/packages/bl/arch/uhhm"
+          done
+
+      - name: Release notes
+        if: matrix.arch == 'x86_64'
+        run: |
+          set -euo pipefail
+          tag="${{ github.ref_name }}"
+          api="${{ github.server_url }}/api/v1/repos/${{ github.repository }}"
+          auth="Authorization: token ${{ secrets.GITHUB_TOKEN }}"
+          notes=$(awk -v v="${tag#v}" '/^## /{p = ($2 == v)} p' CHANGELOG.md | tail -n +2)
+          body=$(jq -n --arg tag "$tag" --arg notes "$notes" '{tag_name: $tag, name: $tag, body: $notes}')
+          curl -sf -X POST -H "$auth" -H 'Content-Type: application/json' -d "$body" "$api/releases" > /dev/null \
+            || echo "release $tag exists"

.github/FUNDING.yml

@@ -0,0 +1,3 @@
+# These are supported funding model platforms
+
+liberapay: kennylevinsen

.gitignore

@@ -0,0 +1 @@
+/target

CHANGELOG.md

@@ -0,0 +1,22 @@
+# Changelog
+
+## 0.4.1 (2026-10-03)
+
+- No more desktop-file cache: wldash scanned `~/.cache/wldash/desktop.json` (on NFS for shared homes, and stale after every package install) and needed a manual `--desktop-refresh`. Desktop files are now scanned on a background thread at every start, a few milliseconds over local `/usr/share`. `--desktop-refresh` is a no-op kept for key bindings; `simd-json` is gone.
+- Calculator history and the Escape-saved prompt moved from `$XDG_CACHE_HOME/wldash` to `$XDG_STATE_HOME/wldash` (`~/.local/state`), where small roaming state belongs; old files are still read.
+- Launcher: `Type=Link` entries open their URL with `xdg-open`; `Terminal=true` entries run inside `$TERMINAL -e` when that variable is set.
+
+## 0.4.0 (2026-10-03)
+
+First release of the project.uhhm.no fork, packaged for the `[uhhm]` Arch registry. Numbering: upstream's old code base was tagged up to v0.3.0 and the rewrite called itself 0.2.0; this fork continues above both so pacman sees a monotonic version.
+
+- Launcher: the prompt cursor was a byte offset in some places and a grapheme index in others, so typing æøå and then End or another key crashed wldash. The cursor is grapheme-based everywhere, Up stops at the last row, mouse selection can't underflow, and all desktop Exec field codes (`%i`, `%c`, `%k`, `%%`, ...) are stripped.
+- No more aborting on machines without a backlight, battery or PulseAudio: `/sys/class/backlight` itself was taken for a device, UPower's always-present DisplayDevice for a battery, and a failed audio connection panicked a thread (fatal with `panic = "abort"`).
+- Redraws: `Geometry::expand` computed the damage height from the wrong field; buffer refcounts no longer underflow; `wl_shm_pool`s are destroyed on resize.
+- Input: a key-repeat rate of 0 divided by zero; Escape is now seen by the launcher first so the prompt is saved for Ctrl+R; the first layer-surface configure always lays out.
+- Config: `/etc/wldash/config.yml` takes precedence over `~/.config/wldash/config.yml` when present (machine-local layout on NFS-shared homes); `--config` overrides both. Errors print one line and exit 1 instead of panicking.
+- Housekeeping: `memmap` → `memmap2`, unused `shlex` dropped, zero rustc/clippy warnings, rustfmt applied, unit tests for the prompt, Exec parsing and geometry.
+
+## 0.2.0
+
+Upstream (kennylevinsen/wldash) rewrite, the state this fork started from.

CNAME

@@ -1 +0,0 @@
-wldash.org

Cargo.toml

@@ -0,0 +1,41 @@
+[package]
+name = "wldash"
+version = "0.4.1"
+edition = "2024"
+
+[profile.release]
+#debug = true
+lto = "fat"
+panic = "abort"
+
+[features]
+default = ["fontconfig"]
+
+[dependencies]
+wayland-client = { version = "0.30", features = ["calloop", "log"] }
+wayland-protocols = { version = "0.30", features = ["client", "unstable", "staging"] }
+wayland-protocols-wlr = { version = "0.1", features = ["client"] }
+nix = "0.26" # 0.27 is breaking
+memmap2 = "0.9"
+fontconfig = { version = "0.8.0", optional = true }
+rusttype = "0.9"
+# fontdue = "0.7"
+calloop = { version = "0.10" } # update breaks
+chrono = "0.4"
+
+walkdir = "2.4"
+
+unicode-segmentation = "1.10"
+fuzzy-matcher = "0.3"
+
+xkbcommon = { version = "0.8", features = ["wayland"] }
+
+rcalc_lib = "1.0"
+
+#alsa = { version = "0.7", optional = true }
+dbus = "0.9"
+libpulse-binding = "2.28"
+
+serde = { version = "1.0", features = ["derive"] }
+serde_yaml = "0.9"
+

LICENSE

@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
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+
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+
+                     END OF TERMS AND CONDITIONS
+
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+
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+    Copyright (C) <year>  <name of author>
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+    it under the terms of the GNU General Public License as published by
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+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

PKGBUILD

@@ -0,0 +1,40 @@
+# Maintainer: Bendik Aagaard Lynghaug <bendik.lynghaug@gmail.com>
+# Built from the tagged checkout by .gitea/workflows/release.yml, once
+# per architecture, and uploaded to the [uhhm] registry on
+# project.uhhm.no (namespace bl). pkgver is the version; the tag has
+# to agree with it and with Cargo.toml.
+pkgname=wldash
+pkgver=0.4.1
+pkgrel=1
+pkgdesc="Dashboard/launcher/control-panel for wlroots-style Wayland compositors (layer-shell)"
+arch=('x86_64' 'aarch64')
+url="https://project.uhhm.no/bl/wldash"
+license=('GPL-3.0-only')
+depends=('glibc' 'gcc-libs' 'dbus' 'libpulse' 'libxkbcommon' 'fontconfig' 'wayland')
+makedepends=('cargo')
+optdepends=('upower: battery widget'
+            'pipewire-pulse: volume widget (or pulseaudio)')
+# !lto: Cargo.toml already does lto = "fat"; makepkg's -flto in RUSTFLAGS
+# would only fight it. !debug: panic = "abort" release, nothing to strip.
+options=('!debug' '!lto')
+
+# Sources are the checkout itself: makepkg resolves local sources by
+# basename next to the PKGBUILD, so the tagged tree CI builds from is
+# the source of truth, as in uhhm/gdo.
+
+build() {
+    cd "$startdir"
+    cargo build --release --locked
+}
+
+check() {
+    cd "$startdir"
+    cargo test --release --locked
+}
+
+package() {
+    cd "$startdir"
+    install -Dm755 "${CARGO_TARGET_DIR:-target}/release/wldash" "$pkgdir/usr/bin/wldash"
+    install -Dm644 README.md "$pkgdir/usr/share/doc/$pkgname/README.md"
+    install -Dm644 LICENSE "$pkgdir/usr/share/licenses/$pkgname/LICENSE"
+}

README.md

@@ -0,0 +1,82 @@
+# wldash
+
+![screenshot](https://git.sr.ht/~kennylevinsen/wldash/blob/master/assets/screenshot.jpg)
+
+A dashboard/launcher/control-panel thing for Wayland. Requires wlr-layer-shell-unstable-v1.
+
+Consider this alpha-quality: While it works, *everything* is subject to change with a moments notice. You may end up pulling in the latest changes, and *poof*, wldash suddenly turns into an artisan espresso machine.
+
+## Rewrite note
+
+wldash has received a significant rewrite. The old version is available in the wldash1 branch for now.
+
+## This fork
+
+This is a maintained fork of [kennylevinsen/wldash](https://github.com/kennylevinsen/wldash)
+living at <https://project.uhhm.no/bl/wldash>. On top of upstream it fixes a number of
+crashes (non-ASCII input in the launcher, machines without a backlight, battery or
+PulseAudio, key-repeat rate 0, ...), corrects redraw damage tracking, and prefers a
+machine-local `/etc/wldash/config.yml` over the per-user config when present, which keeps
+per-host layouts apart on NFS-shared homes.
+
+## How to use
+
+1. Checkout: `git clone https://project.uhhm.no/bl/wldash`
+2. Build: `cargo build --release`
+3. Put somewhere: `cp target/release/wldash /usr/local/bin/wldash`
+4. Run: `wldash`
+
+To generate a new default configuration, run `wldash --write-default-config`. To configure, edit `$XDG_CONFIG_HOME/wldash/config.yml` (or if `XDG_CONFIG_HOME` is not set, `~/.config/wldash/config.yml`). If `/etc/wldash/config.yml` exists it takes precedence over the per-user file; `--config FILE` overrides both.
+
+Desktop files are scanned every time wldash starts (on a background thread), so there is no cache to refresh; `--desktop-refresh` is kept as a no-op for old key bindings. Calculator history and the prompt saved on Escape live in `$XDG_STATE_HOME/wldash` (`~/.local/state/wldash`); older installs' files under `~/.cache/wldash` are still read.
+
+For more info, look in `src/config.rs`.
+
+## System dependencies
+
+`dbus`. See https://github.com/diwic/dbus-rs#requirements.
+
+## How to use launcher
+
+The launcher for wldash is built-in, based on https://github.com/kennylevinsen/dot-desktop. Pluggable systems may come back in the future.
+
+The environment variables `XDG_DATA_DIRS` and `XDG_DATA_HOME` are read to find the many `applications` folders that contain `desktop` files.
+
+## Features
+
+### Date and time
+
+In nice, big letters!
+
+### 3 month calendar
+
+Scroll or click on the months to navigate.
+
+### Battery level
+
+Over upower, only visible if upower battery is detected
+
+### Audio volume
+
+Over pulseaudio, only visible if pulseaudio connection is successful. Scroll to adjust volume, right-click to toggle mute.
+
+### Backlight control
+
+Using backlight sys file, only visible of backlight is detected. Scroll to adjust, right-click to toggle between the extreme values.
+
+### Launcher
+
+Loads desktop files from the usual locations.
+
+The launcher also accepts prefix operators to change its mode:
+
+- `!`: Arbitrary command
+- `=`: Calculator based on rcalc_lib. See https://docs.rs/rcalc_lib/0.9.3/rcalc_lib/
+
+## Notable missing features:
+
+- Scaling of any kind - all sizes are currently hardcoded in pixels
+
+## How to discuss
+
+Go to #kennylevinsen @ irc.libera.chat to discuss, or use [~kennylevinsen/public-inbox@lists.sr.ht](https://lists.sr.ht/~kennylevinsen/public-inbox).

index.html

@@ -1,102 +0,0 @@
-<!DOCTYPE html>
-<html>
-	<head>
-		<title>wldash</title>
-		<meta http-equiv="refresh" content="0; URL=https://kl.wtf/projects/wldash">
-		<link rel="canonical" href="https://kl.wtf/projects/wldash">
-		<meta name="viewport" content="width=device-width, initial-scale=1.0">
-		<style>
-			body {
-				display: grid;
-				justify-items: center;
-				align-items: center;
-			}
-			h1 {
-				font-size: 3em;
-				text-align: center;
-				font-family: monospace;
-			}
-			h2 {
-				text-align: center;
-				font-family: monospace;
-			}
-			h3 {
-				font-family: monospace;
-			}
-			header {
-				width: 100%;
-				max-width: 720px;
-			}
-			section {
-				width: 100%;
-				max-width: 720px;
-			}
-			a {
-				text-decoration: unset;
-				color: rgb(100, 100, 100);
-			}
-			li {
-				list-style-type: '— ';
-			}
-			p {
-				margin-bottom: 2em;
-			}
-			img {
-				width: 100%;
-				border-radius: 10px;
-			}
-		</style>
-	</head>
-	<body>
-		<header>
-			<h1>wldash</h1>
-			<h2>wayland launcher/dashboard</h2>
-		</header>
-		<section>
-			<img src="images/wldash.jpg" alt="screenshot of wldash" />
-			<p>
-				<a href="https://github.com/kennylevinsen/wldash"><code>wldash</code></a> is a convenient dashboard and launcher for Wayland (requires wlr-layer-shell-unstable-v1 support), allowing easy access to things like date and time, backlight and volume control.
-			</p>
-			<h3>How to get wldash</h3>
-			<ul>
-				<li><a href="https://github.com/kennylevinsen/wldash/releases">Download the latest release from GitHub</a></li>
-				<li>To build:
-					<pre><code>
-git clone https://github.com/kennylevinsen/wldash
-cd wldash
-cargo build --release
-cp ./target/release/wldash /usr/local/bin/
-wldash
-					</code></pre>
-				</li>
-			</ul>
-			<h3>Usage</h3>
-			<p>
-				Run <code>wldash print-config</code> to see the current configuration. Use that as template to write a new one to <code>~/.config/wldash/config.json</code>. The widgets, their size and layout can be configured as well.
-			</p>
-			<p>
-				To make wldash toggle itself every time it is started, instantiate with <code>wldash start-or-kill</code>.
-			</p>
-			<p>
-				To run arbitrary command, type <code>!</code>. To use built-in calculator, type <code>=</code>.
-			</p>
-			<p>
-				Hint: Try to scroll, left-click and right-click on things.
-			</p>
-			<h3>Links</h3>
-			<p>
-				<ul>
-					<li>Github link: <a href="https://github.com/kennylevinsen/wldash">https://github.com/kennylevinsen/wldash</a></li>
-					<li>IRC: #wldash @ irc.freenode.net</li>
-				</ul>
-			</p>
-			<h3>Donate</h3>
-			<ul>
-				<li><a href="https://en.liberapay.com/kennylevinsen/">LiberaPay</a></li>
-			</ul>
-			<p>
-				<a href="https://kl.wtf/">© 2019, Kenny Levinsen</a>
-			</p>
-		</section>
-	</body>
-</html>

src/buffer.rs

@@ -0,0 +1,285 @@
+use std::{
+    fs::File,
+    io,
+    os::unix::io::{FromRawFd, RawFd},
+    time::SystemTime,
+    time::UNIX_EPOCH,
+};
+
+#[cfg(target_os = "linux")]
+use nix::sys::memfd;
+use nix::{
+    errno::Errno,
+    fcntl,
+    sys::{mman, stat},
+    unistd,
+};
+
+use memmap2::MmapMut;
+
+use wayland_client::{
+    Dispatch, QueueHandle,
+    protocol::{wl_buffer, wl_shm, wl_shm_pool},
+};
+
+use crate::color::Color;
+use crate::widgets::Geometry;
+
+fn create_shm_fd() -> io::Result<RawFd> {
+    // Only try memfd on linux
+    #[cfg(target_os = "linux")]
+    loop {
+        match memfd::memfd_create(c"wldash", memfd::MemFdCreateFlag::MFD_CLOEXEC) {
+            Ok(fd) => return Ok(fd),
+            Err(Errno::EINTR) => continue,
+            Err(Errno::ENOSYS) => break,
+            Err(errno) => return Err(io::Error::from(errno)),
+        }
+    }
+
+    // Fallback to using shm_open
+    let sys_time = SystemTime::now();
+    let mut mem_file_handle = format!(
+        "/wldash-{}",
+        sys_time.duration_since(UNIX_EPOCH).unwrap().subsec_nanos()
+    );
+    loop {
+        match mman::shm_open(
+            mem_file_handle.as_str(),
+            fcntl::OFlag::O_CREAT
+                | fcntl::OFlag::O_EXCL
+                | fcntl::OFlag::O_RDWR
+                | fcntl::OFlag::O_CLOEXEC,
+            stat::Mode::S_IRUSR | stat::Mode::S_IWUSR,
+        ) {
+            Ok(fd) => match mman::shm_unlink(mem_file_handle.as_str()) {
+                Ok(_) => return Ok(fd),
+                Err(errno) => match unistd::close(fd) {
+                    Ok(_) => return Err(io::Error::from(errno)),
+                    Err(errno) => return Err(io::Error::from(errno)),
+                },
+            },
+            Err(Errno::EEXIST) => {
+                // If a file with that handle exists then change the handle
+                mem_file_handle = format!(
+                    "/wldash-{}",
+                    sys_time.duration_since(UNIX_EPOCH).unwrap().subsec_nanos()
+                );
+                continue;
+            }
+            Err(Errno::EINTR) => continue,
+            Err(errno) => return Err(io::Error::from(errno)),
+        }
+    }
+}
+
+pub struct ShmBuffer {
+    // Keeps the memfd alive for as long as the mapping and pool exist.
+    #[allow(dead_code)]
+    pub file: File,
+    pub mmap: MmapMut,
+    pub pool: wl_shm_pool::WlShmPool,
+    pub buffer: wl_buffer::WlBuffer,
+    pub refcnt: u32,
+    pub last_damage: Vec<Geometry>,
+}
+
+impl ShmBuffer {
+    fn new<D>(
+        shm: &wl_shm::WlShm,
+        qh: &QueueHandle<D>,
+        width: i32,
+        height: i32,
+        stride: i32,
+        format: wl_shm::Format,
+    ) -> io::Result<ShmBuffer>
+    where
+        D: Dispatch<wl_shm_pool::WlShmPool, ()> + Dispatch<wl_buffer::WlBuffer, ()> + 'static,
+    {
+        let mem_fd = create_shm_fd()?;
+        let file = unsafe { File::from_raw_fd(mem_fd) };
+        file.set_len((height * stride) as u64)?;
+        let pool = shm.create_pool(mem_fd, height * stride, qh, ());
+        let mmap = unsafe { MmapMut::map_mut(&file)? };
+        let buffer = pool.create_buffer(0, width, height, stride, format, qh, ());
+
+        Ok(ShmBuffer {
+            refcnt: 0,
+            file,
+            mmap,
+            pool,
+            buffer,
+            last_damage: Vec::new(),
+        })
+    }
+
+    pub fn acquire(&mut self) {
+        self.refcnt += 1;
+    }
+
+    pub fn release(&mut self) {
+        // A compositor may release a buffer we never considered acquired
+        // (e.g. after a resize); never underflow and wedge the buffer.
+        self.refcnt = self.refcnt.saturating_sub(1);
+    }
+}
+
+pub struct BufferManager {
+    pub buffers: Vec<ShmBuffer>,
+}
+
+impl BufferManager {
+    pub fn new() -> BufferManager {
+        BufferManager {
+            buffers: Vec::new(),
+        }
+    }
+
+    pub fn clear_buffers(&mut self) {
+        for buf in self.buffers.iter_mut() {
+            buf.buffer.destroy();
+            buf.pool.destroy();
+        }
+        self.buffers.clear()
+    }
+
+    pub fn next_buffer(&mut self) -> Option<&mut ShmBuffer> {
+        self.buffers.iter_mut().find(|buf| buf.refcnt == 0)
+    }
+
+    pub fn add_buffer<D>(
+        &mut self,
+        wl_shm: &wl_shm::WlShm,
+        dimensions: (i32, i32),
+        qh: &QueueHandle<D>,
+    ) where
+        D: Dispatch<wl_shm_pool::WlShmPool, ()> + Dispatch<wl_buffer::WlBuffer, ()> + 'static,
+    {
+        let buf = ShmBuffer::new(
+            wl_shm,
+            qh,
+            dimensions.0,
+            dimensions.1,
+            dimensions.0 * 4,
+            wl_shm::Format::Argb8888,
+        )
+        .expect("unable to add buffer");
+        self.buffers.push(buf);
+    }
+}
+
+pub struct BufferView<'a> {
+    view: &'a mut [u32],
+    dimensions: (u32, u32),
+    subdimensions: Option<(u32, u32, u32, u32)>,
+}
+
+impl<'a> BufferView<'a> {
+    pub fn new(buf: &'a mut MmapMut, dimensions: (u32, u32)) -> BufferView<'a> {
+        let view = unsafe {
+            std::slice::from_raw_parts_mut(
+                buf.as_mut_ptr() as *mut u32,
+                (dimensions.0 * dimensions.1) as usize,
+            )
+        };
+        BufferView {
+            view,
+            dimensions,
+            subdimensions: None,
+        }
+    }
+
+    #[inline]
+    pub fn get_bounds(&self) -> (u32, u32, u32, u32) {
+        if let Some(subdim) = self.subdimensions {
+            subdim
+        } else {
+            (0, 0, self.dimensions.0, self.dimensions.1)
+        }
+    }
+
+    pub fn subdimensions(&mut self, subdimensions: (u32, u32, u32, u32)) -> BufferView<'_> {
+        let bounds = self.get_bounds();
+        if cfg!(debug_assertions)
+            && (subdimensions.0 + subdimensions.2 > bounds.2
+                || subdimensions.1 + subdimensions.3 > bounds.3)
+        {
+            panic!(
+                "cannot create subdimensions larger than buffer: {:?} > {:?}",
+                subdimensions, bounds
+            );
+        }
+
+        BufferView {
+            view: self.view,
+            dimensions: self.dimensions,
+            subdimensions: Some((
+                subdimensions.0 + bounds.0,
+                subdimensions.1 + bounds.1,
+                subdimensions.2,
+                subdimensions.3,
+            )),
+        }
+    }
+
+    pub fn subgeometry(&mut self, geo: Geometry) -> BufferView<'_> {
+        self.subdimensions((geo.x, geo.y, geo.width, geo.height))
+    }
+
+    pub fn offset(&mut self, offset: (u32, u32)) -> BufferView<'_> {
+        let bounds = self.get_bounds();
+        if cfg!(debug_assertions) && (offset.0 > bounds.2 || offset.1 > bounds.3) {
+            panic!(
+                "cannot create offset outside buffer: {:?} > {:?}",
+                offset, bounds
+            );
+        }
+
+        BufferView {
+            view: self.view,
+            dimensions: self.dimensions,
+            subdimensions: Some((
+                offset.0 + bounds.0,
+                offset.1 + bounds.1,
+                bounds.2 - offset.0,
+                bounds.3 - offset.1,
+            )),
+        }
+    }
+
+    pub fn memset(&mut self, c: Color) {
+        if let Some(subdim) = self.subdimensions {
+            for y in subdim.1..(subdim.1 + subdim.3) {
+                let start = (subdim.0 + y * self.dimensions.0) as usize;
+                let end = start + subdim.2 as usize;
+                self.view[start..end].fill(c.0);
+            }
+        } else {
+            self.view.fill(c.0);
+        }
+    }
+
+    pub fn clear(&mut self) {
+        if let Some(subdim) = self.subdimensions {
+            for y in subdim.1..(subdim.1 + subdim.3) {
+                let start = (subdim.0 + y * self.dimensions.0) as usize;
+                let end = start + subdim.2 as usize;
+                self.view[start..end].fill(0x0);
+            }
+        } else {
+            self.view.fill(0x0);
+        }
+    }
+
+    #[inline]
+    pub fn put_raw(&mut self, pos: (u32, u32), c: Color) {
+        self.view[(pos.0 + pos.1 * self.dimensions.0) as usize] = c.0
+    }
+
+    #[inline]
+    pub fn put_line_raw(&mut self, pos: (u32, u32), len: u32, c: Color) {
+        let start = (pos.0 + (pos.1 * self.dimensions.0)) as usize;
+        let len = len as usize;
+        self.view[start..start + len].fill(c.0);
+    }
+}

src/color.rs

@@ -0,0 +1,42 @@
+#[derive(Copy, Clone)]
+pub struct Color(pub u32);
+
+impl Color {
+    pub const WHITE: Color = Color(0xFFFFFFFF);
+    pub const GREY35: Color = Color(0xFF595959);
+    pub const GREY50: Color = Color(0xFF7F7F7F);
+    pub const GREY75: Color = Color(0xFFBFBFBF);
+    pub const GREY80: Color = Color(0xFFCCCCCC);
+    pub const RED: Color = Color(0xFFFF0000);
+    pub const YELLOW: Color = Color(0xFFFFFF00);
+    pub const LIGHTGREEN: Color = Color(0xFF7FFF7F);
+    pub const LIGHTORANGE: Color = Color(0xFFFFBF00);
+    pub const DARKORANGE: Color = Color(0xFFFF7F00);
+    pub const BUFF: Color = Color(0xFFFFBF7F);
+
+    #[allow(unused)]
+    pub fn new(red: u8, green: u8, blue: u8, opacity: u8) -> Color {
+        Color((opacity as u32) << 24 | (red as u32) << 16 | (green as u32) << 8 | (blue as u32))
+    }
+
+    fn red(self) -> u8 {
+        ((self.0 >> 16) & 0xFF) as u8
+    }
+    fn green(self) -> u8 {
+        ((self.0 >> 8) & 0xFF) as u8
+    }
+    fn blue(self) -> u8 {
+        (self.0 & 0xFF) as u8
+    }
+
+    pub fn alpha(self, alpha: f32) -> Color {
+        unsafe {
+            Color(
+                (255. * alpha).to_int_unchecked::<u32>() << 24
+                    | (self.red() as f32 * alpha).to_int_unchecked::<u32>() << 16
+                    | (self.green() as f32 * alpha).to_int_unchecked::<u32>() << 8
+                    | (self.blue() as f32 * alpha).to_int_unchecked::<u32>(),
+            )
+        }
+    }
+}

src/config.rs

@@ -0,0 +1,387 @@
+use serde::{self, Deserialize, Serialize};
+
+use std::collections::HashMap;
+use std::default::Default;
+use std::sync::{Arc, Mutex};
+
+use crate::{
+    event::Events,
+    fonts::{FontMap, find_font},
+    widgets::{
+        Backlight, Battery, Calendar, Clock, Date, HorizontalLayout, IndexedLayout, Interface,
+        InvertedHorizontalLayout, InvertedVerticalLayout, Layout, Line, Margin, PulseAudio,
+        VerticalLayout, Widget as RealWidget,
+    },
+};
+
+#[derive(Serialize, Deserialize, Clone, Debug)]
+#[serde(rename_all = "snake_case")]
+pub enum OperationMode {
+    LayerSurface((u32, u32)),
+    XdgToplevel,
+}
+
+#[derive(Serialize, Deserialize, Clone, Debug)]
+#[serde(rename_all = "snake_case")]
+pub enum Widget {
+    Margin {
+        margins: (u32, u32, u32, u32),
+        widget: Box<Widget>,
+    },
+    HorizontalLayout(Vec<Widget>),
+    InvertedHorizontalLayout(Vec<Widget>),
+    VerticalLayout(Vec<Widget>),
+    InvertedVerticalLayout(Vec<Widget>),
+    HorizontalLine(u32),
+    VerticalLine(u32),
+    Clock {
+        font: Option<String>,
+        font_size: f32,
+    },
+    Date {
+        font: Option<String>,
+        font_size: f32,
+    },
+    Calendar {
+        font_primary: Option<String>,
+        font_secondary: Option<String>,
+        font_size: f32,
+        sections_x: i32,
+        sections_y: i32,
+    },
+    Launcher {
+        font: Option<String>,
+        font_size: f32,
+        launch_cmd: Option<String>,
+    },
+    Battery {
+        font: Option<String>,
+        font_size: f32,
+    },
+    Backlight {
+        device: Option<String>,
+        font: Option<String>,
+        font_size: f32,
+    },
+    PulseAudio {
+        font: Option<String>,
+        font_size: f32,
+    },
+}
+
+impl Default for OperationMode {
+    fn default() -> OperationMode {
+        OperationMode::LayerSurface((1024, 768))
+    }
+}
+
+#[derive(Serialize, Deserialize, Clone, Debug)]
+#[serde(rename_all = "snake_case")]
+pub struct Config {
+    pub font_paths: Option<HashMap<String, String>>,
+    pub widget: Widget,
+    pub mode: OperationMode,
+    pub background: Option<u32>,
+    pub server: Option<bool>,
+}
+
+impl Config {
+    pub fn generate_v1() -> Config {
+        let has_battery = Battery::detect();
+        let has_backlight = Backlight::detect();
+        let sans = find_font("sans");
+        let monospace = find_font("monospace");
+
+        let mut bars = Vec::new();
+        if has_battery {
+            bars.push(Widget::Margin {
+                margins: (0, 0, 0, 8),
+                widget: Box::new(Widget::Battery {
+                    font: None,
+                    font_size: 24.,
+                }),
+            });
+        }
+        if has_backlight {
+            bars.push(Widget::Margin {
+                margins: (0, 0, 0, 8),
+                widget: Box::new(Widget::Backlight {
+                    device: None,
+                    font: None,
+                    font_size: 24.,
+                }),
+            });
+        }
+        bars.push(Widget::Margin {
+            margins: (0, 0, 0, 8),
+            widget: Box::new(Widget::PulseAudio {
+                font: None,
+                font_size: 24.,
+            }),
+        });
+
+        let widget = Widget::Margin {
+            margins: (20, 20, 20, 20),
+            widget: Box::new(Widget::VerticalLayout(vec![
+                Widget::HorizontalLayout(vec![
+                    Widget::VerticalLayout(vec![
+                        Widget::Date {
+                            font: None,
+                            font_size: 48.,
+                        },
+                        Widget::Clock {
+                            font: None,
+                            font_size: 256.,
+                        },
+                    ]),
+                    Widget::Margin {
+                        margins: (88, 0, 0, 0),
+                        widget: Box::new(Widget::VerticalLayout(bars)),
+                    },
+                ]),
+                Widget::Calendar {
+                    font_primary: None,
+                    font_secondary: None,
+                    font_size: 36.,
+                    sections_x: 3,
+                    sections_y: 1,
+                },
+                Widget::Launcher {
+                    font: None,
+                    font_size: 32.,
+                    launch_cmd: None,
+                },
+            ])),
+        };
+
+        let map = HashMap::from([
+            ("sans".to_string(), sans),
+            ("monospace".to_string(), monospace),
+        ]);
+
+        Config {
+            font_paths: Some(map),
+            widget,
+            mode: OperationMode::LayerSurface((1024, 768)),
+            background: Some(0xFAFAFAFA),
+            server: None,
+        }
+    }
+
+    pub fn generate_v2(clay: bool) -> Config {
+        let has_battery = Battery::detect();
+        let has_backlight = Backlight::detect();
+        let sans = find_font("sans");
+        let monospace = find_font("monospace");
+
+        let mut bars = Vec::new();
+        if has_battery {
+            bars.push(Widget::Margin {
+                margins: (16, 8, 8, 0),
+                widget: Box::new(Widget::Battery {
+                    font: None,
+                    font_size: 24.,
+                }),
+            });
+        }
+        if has_backlight {
+            bars.push(Widget::Margin {
+                margins: (16, 8, 8, 0),
+                widget: Box::new(Widget::Backlight {
+                    device: None,
+                    font: None,
+                    font_size: 24.,
+                }),
+            });
+        }
+        bars.push(Widget::Margin {
+            margins: (16, 8, 8, 0),
+            widget: Box::new(Widget::PulseAudio {
+                font: None,
+                font_size: 24.,
+            }),
+        });
+
+        let widget = Widget::VerticalLayout(vec![
+            Widget::HorizontalLayout(vec![
+                Widget::Margin {
+                    margins: (8, 0, 0, 0),
+                    widget: Box::new(Widget::Clock {
+                        font: None,
+                        font_size: 128.,
+                    }),
+                },
+                Widget::Margin {
+                    margins: (16, 64, 0, 0),
+                    widget: Box::new(Widget::Date {
+                        font: None,
+                        font_size: 48.,
+                    }),
+                },
+                Widget::VerticalLayout(bars),
+            ]),
+            Widget::HorizontalLine(1),
+            Widget::InvertedHorizontalLayout(vec![
+                Widget::Margin {
+                    margins: (16, 8, 16, 0),
+                    widget: Box::new(Widget::Calendar {
+                        font_primary: None,
+                        font_secondary: None,
+                        font_size: 24.,
+                        sections_x: 1,
+                        sections_y: if clay { -1 } else { 3 },
+                    }),
+                },
+                Widget::VerticalLine(1),
+                Widget::Margin {
+                    margins: (8, 0, 0, 0),
+                    widget: Box::new(Widget::Launcher {
+                        font: None,
+                        font_size: 32.,
+                        launch_cmd: None,
+                    }),
+                },
+            ]),
+        ]);
+
+        let map = HashMap::from([
+            ("sans".to_string(), sans),
+            ("monospace".to_string(), monospace),
+        ]);
+
+        Config {
+            font_paths: Some(map),
+            widget,
+            mode: if clay {
+                OperationMode::XdgToplevel
+            } else {
+                OperationMode::LayerSurface((1024, 1))
+            },
+            background: Some(0xFAFAFAFA),
+            server: None,
+        }
+    }
+}
+
+fn leak_or_default(v: Option<String>, d: &'static str) -> &'static str {
+    match v {
+        Some(v) => Box::leak(v.into_boxed_str()),
+        None => d,
+    }
+}
+
+fn leak_or_none(v: Option<String>) -> Option<&'static str> {
+    match v {
+        Some(v) => Some(Box::leak(v.into_boxed_str())),
+        None => None,
+    }
+}
+
+impl Widget {
+    pub fn construct_widgets(
+        self,
+        v: &mut Vec<Box<dyn RealWidget>>,
+        fm: &mut FontMap,
+        events: &Arc<Mutex<Events>>,
+    ) {
+        match self {
+            Widget::Margin { widget, .. } => widget.construct_widgets(v, fm, events),
+            Widget::HorizontalLayout(widgets) => widgets
+                .into_iter()
+                .for_each(|w| w.construct_widgets(v, fm, events)),
+            Widget::InvertedHorizontalLayout(widgets) => widgets
+                .into_iter()
+                .for_each(|w| w.construct_widgets(v, fm, events)),
+            Widget::VerticalLayout(widgets) => widgets
+                .into_iter()
+                .for_each(|w| w.construct_widgets(v, fm, events)),
+            Widget::InvertedVerticalLayout(widgets) => widgets
+                .into_iter()
+                .for_each(|w| w.construct_widgets(v, fm, events)),
+            Widget::HorizontalLine(width) => v.push(Box::new(Line::new(width, false))),
+            Widget::VerticalLine(width) => v.push(Box::new(Line::new(width, true))),
+            Widget::Clock { font, font_size } => v.push(Box::new(Clock::new(
+                fm,
+                leak_or_default(font, "sans"),
+                font_size,
+            ))),
+            Widget::Date { font, font_size } => v.push(Box::new(Date::new(
+                fm,
+                leak_or_default(font, "sans"),
+                font_size,
+            ))),
+            Widget::Calendar {
+                font_primary,
+                font_secondary,
+                font_size,
+                sections_x,
+                sections_y,
+            } => v.push(Box::new(Calendar::new(
+                fm,
+                leak_or_default(font_primary, "monospace"),
+                leak_or_default(font_secondary, "sans"),
+                font_size,
+                sections_x,
+                sections_y,
+            ))),
+            Widget::Launcher {
+                font,
+                font_size,
+                launch_cmd,
+            } => v.push(Box::new(Interface::new(
+                events.clone(),
+                fm,
+                leak_or_default(font, "sans"),
+                font_size,
+                launch_cmd,
+            ))),
+            Widget::Battery { font, font_size } => v.push(Box::new(Battery::new(
+                events.clone(),
+                fm,
+                leak_or_default(font, "sans"),
+                font_size,
+            ))),
+            Widget::Backlight {
+                device,
+                font,
+                font_size,
+            } => v.push(Box::new(Backlight::new(
+                leak_or_none(device),
+                fm,
+                leak_or_default(font, "sans"),
+                font_size,
+            ))),
+            Widget::PulseAudio { font, font_size } => v.push(Box::new(PulseAudio::new(
+                events.clone(),
+                fm,
+                Box::leak(font.unwrap_or_else(|| "sans".to_string()).into_boxed_str()),
+                font_size,
+            ))),
+        }
+    }
+
+    pub fn construct_layout(&self, idx: &mut usize) -> Box<dyn Layout> {
+        match self {
+            Widget::Margin { margins, widget } => {
+                Margin::new(widget.construct_layout(idx), *margins)
+            }
+            Widget::HorizontalLayout(widgets) => {
+                HorizontalLayout::new(widgets.iter().map(|w| w.construct_layout(idx)).collect())
+            }
+            Widget::InvertedHorizontalLayout(widgets) => InvertedHorizontalLayout::new(
+                widgets.iter().map(|w| w.construct_layout(idx)).collect(),
+            ),
+            Widget::VerticalLayout(widgets) => {
+                VerticalLayout::new(widgets.iter().map(|w| w.construct_layout(idx)).collect())
+            }
+            Widget::InvertedVerticalLayout(widgets) => InvertedVerticalLayout::new(
+                widgets.iter().map(|w| w.construct_layout(idx)).collect(),
+            ),
+            _ => IndexedLayout::new({
+                let i = *idx;
+                *idx += 1;
+                i
+            }),
+        }
+    }
+}

src/draw.rs

@@ -0,0 +1,346 @@
+use crate::buffer::BufferView;
+use crate::{color::Color, fonts::FontRef};
+
+use rusttype::{Scale, point};
+use std::collections::HashMap;
+
+struct CachedGlyph {
+    dimensions: (u32, u32),
+    origin: (i32, i32),
+    render: Vec<f32>,
+    advance: i32,
+}
+
+impl CachedGlyph {
+    fn new(font: FontRef, size: f32, ch: char) -> CachedGlyph {
+        let scale = Scale::uniform(size);
+        let v_metrics = font.v_metrics(scale);
+        let glyph = font.glyph(ch).scaled(scale);
+        let advance = glyph.h_metrics().advance_width as i32;
+        let glyph = glyph.positioned(point(0.0, v_metrics.ascent));
+
+        if let Some(bounding_box) = glyph.pixel_bounding_box() {
+            let origin = (bounding_box.min.x, bounding_box.min.y);
+            let dimensions = (
+                (bounding_box.max.x - bounding_box.min.x) as u32,
+                (bounding_box.max.y - bounding_box.min.y) as u32,
+            );
+            let mut render = vec![0.0; (dimensions.0 * dimensions.1) as usize];
+            glyph.draw(|x, y, o| {
+                let pos = x + (y * dimensions.0);
+                render[pos as usize] = o;
+            });
+            CachedGlyph {
+                origin,
+                dimensions,
+                render,
+                advance,
+            }
+        } else {
+            CachedGlyph {
+                origin: (0, 0),
+                dimensions: (0, 0),
+                render: Vec::new(),
+                advance: (size / 4.0) as i32,
+            }
+        }
+    }
+
+    fn draw(&self, buf: &mut BufferView, pos: (i32, i32), c: Color) {
+        let bounds = buf.get_bounds();
+        if pos.0 as u32 + self.dimensions.0 > bounds.2 {
+            return;
+        }
+
+        let offset = (bounds.0 as i32, bounds.1 as i32);
+        let width = self.dimensions.0 as i32 - 1;
+        let mut x = 0;
+        let mut y = 0;
+        for v in &self.render {
+            buf.put_raw(
+                (
+                    (x + pos.0 + self.origin.0 + offset.0) as u32,
+                    (y + pos.1 + self.origin.1 + offset.1) as u32,
+                ),
+                c.alpha(*v),
+            );
+
+            if x == width {
+                y += 1;
+                x = 0;
+            } else {
+                x += 1;
+            }
+        }
+    }
+}
+
+pub struct Font<'a> {
+    glyphs: HashMap<char, CachedGlyph>,
+    font: FontRef<'a>,
+    size: f32,
+}
+
+impl<'a> Font<'a> {
+    pub fn new(font: FontRef<'a>, size: f32) -> Font<'a> {
+        Font {
+            glyphs: HashMap::new(),
+            font,
+            size,
+        }
+    }
+
+    pub fn height(&self) -> f32 {
+        let scale = Scale::uniform(self.size);
+        let m = self.font.v_metrics(scale);
+        m.ascent - m.descent
+    }
+
+    pub fn add_str_to_cache(&mut self, s: &str) {
+        for ch in s.chars() {
+            if !self.glyphs.contains_key(&ch) {
+                let glyph = CachedGlyph::new(self.font, self.size, ch);
+                self.glyphs.insert(ch, glyph);
+            }
+        }
+    }
+
+    pub fn draw_text(
+        &self,
+        buf: &mut BufferView,
+        c: Color,
+        s: &str,
+    ) -> Result<(u32, u32), ::std::io::Error> {
+        let mut x_off = 0;
+        let mut off = 0;
+        let mut glyphs = Vec::with_capacity(s.len());
+        for ch in s.chars() {
+            let glyph = match self.glyphs.get(&ch) {
+                Some(glyph) => glyph,
+                None => {
+                    return Err(::std::io::Error::other(format!(
+                        "glyph for {:} not in cache",
+                        ch
+                    )));
+                }
+            };
+            glyphs.push(glyph);
+            if glyph.origin.1 < off {
+                off = glyph.origin.1
+            }
+        }
+        for glyph in glyphs {
+            glyph.draw(buf, (x_off, -off), c);
+            x_off += glyph.advance;
+        }
+
+        Ok((x_off as u32, self.size as u32))
+    }
+
+    pub fn draw_text_with_cursor(
+        &self,
+        buf: &mut BufferView,
+        c: Color,
+        s: &str,
+        cursor: usize,
+    ) -> Result<(u32, u32), ::std::io::Error> {
+        let mut x_off: i32 = 0;
+        let mut off: i32 = 0;
+        let mut glyphs = Vec::with_capacity(s.len());
+        for ch in s.chars() {
+            let glyph = match self.glyphs.get(&ch) {
+                Some(glyph) => glyph,
+                None => {
+                    return Err(::std::io::Error::other(format!(
+                        "glyph for {:} not in cache",
+                        ch
+                    )));
+                }
+            };
+            glyphs.push(glyph);
+            if glyph.origin.1 < off {
+                off = glyph.origin.1
+            }
+        }
+
+        let height = self.size.ceil() as u32;
+        for (i, glyph) in glyphs.iter().enumerate() {
+            if i == cursor {
+                self.draw_cursor(buf, c, x_off as u32, height)?;
+            }
+            glyph.draw(buf, (x_off, -off), c);
+            x_off += glyph.advance;
+        }
+        if cursor == glyphs.len() {
+            self.draw_cursor(buf, c, x_off as u32, height)?;
+        }
+
+        Ok((x_off as u32, self.size as u32))
+    }
+
+    fn draw_cursor(
+        &self,
+        buf: &mut BufferView,
+        c: Color,
+        offset: u32,
+        height: u32,
+    ) -> Result<(), ::std::io::Error> {
+        // draw cursor
+        let bounds = buf.get_bounds();
+        if offset + 1 > bounds.2 {
+            return Ok(());
+        }
+        for i in bounds.1 + 1..height + bounds.1 {
+            buf.put_raw((bounds.0 + offset, i), c);
+        }
+        Ok(())
+    }
+
+    pub fn auto_widest(&mut self, s: &str) -> Result<u32, ::std::io::Error> {
+        self.add_str_to_cache(s);
+        let mut max = 0;
+        for ch in s.chars() {
+            let glyph = match self.glyphs.get(&ch) {
+                Some(glyph) => glyph,
+                None => {
+                    return Err(::std::io::Error::other(format!(
+                        "glyph for {:} not in cache",
+                        ch
+                    )));
+                }
+            };
+            let width = glyph.advance;
+            if width > max {
+                max = width
+            }
+        }
+        Ok(max as u32)
+    }
+
+    pub fn auto_draw_text(
+        &mut self,
+        buf: &mut BufferView,
+        c: Color,
+        s: &str,
+    ) -> Result<(u32, u32), ::std::io::Error> {
+        self.add_str_to_cache(s);
+        self.draw_text(buf, c, s)
+    }
+
+    pub fn auto_draw_text_with_cursor(
+        &mut self,
+        buf: &mut BufferView,
+        c: Color,
+        s: &str,
+        cursor: usize,
+    ) -> Result<(u32, u32), ::std::io::Error> {
+        self.add_str_to_cache(s);
+        self.draw_text_with_cursor(buf, c, s, cursor)
+    }
+
+    pub fn draw_text_fixed_width(
+        &self,
+        buf: &mut BufferView,
+        c: Color,
+        distances: &[u32],
+        s: &str,
+    ) -> Result<(u32, u32), ::std::io::Error> {
+        let mut x_off = 0;
+        let mut off = 0;
+        let mut glyphs = Vec::with_capacity(s.len());
+        for ch in s.chars() {
+            let glyph = match self.glyphs.get(&ch) {
+                Some(glyph) => glyph,
+                None => {
+                    return Err(::std::io::Error::other(format!(
+                        "glyph for {:} not in cache",
+                        ch
+                    )));
+                }
+            };
+            glyphs.push(glyph);
+            if glyph.origin.1 < off {
+                off = glyph.origin.1
+            }
+        }
+        for (idx, glyph) in glyphs.into_iter().enumerate() {
+            glyph.draw(buf, (x_off, -off), c);
+            x_off += distances[idx] as i32;
+        }
+
+        Ok((x_off as u32, self.size as u32))
+    }
+
+    pub fn draw_text_individual_colors(
+        &self,
+        buf: &mut BufferView,
+        color: &[Color],
+        s: &str,
+    ) -> Result<(u32, u32), ::std::io::Error> {
+        let mut x_off = 0;
+        let mut off = 0;
+        let mut glyphs = Vec::with_capacity(s.len());
+        for ch in s.chars() {
+            let glyph = match self.glyphs.get(&ch) {
+                Some(glyph) => glyph,
+                None => {
+                    return Err(::std::io::Error::other(format!(
+                        "glyph for {:} not in cache",
+                        ch
+                    )));
+                }
+            };
+            glyphs.push(glyph);
+            if glyph.origin.1 < off {
+                off = glyph.origin.1
+            }
+        }
+        for (idx, glyph) in glyphs.into_iter().enumerate() {
+            glyph.draw(buf, (x_off, -off), color[idx]);
+            x_off += glyph.advance;
+        }
+
+        Ok((x_off as u32, self.size as u32))
+    }
+
+    pub fn auto_draw_text_individual_colors(
+        &mut self,
+        buf: &mut BufferView,
+        color: &[Color],
+        s: &str,
+    ) -> Result<(u32, u32), ::std::io::Error> {
+        self.add_str_to_cache(s);
+        self.draw_text_individual_colors(buf, color, s)
+    }
+}
+
+pub fn draw_box(buf: &mut BufferView, c: Color, dim: (u32, u32)) -> Result<(), ::std::io::Error> {
+    let bounds = buf.get_bounds();
+    buf.put_line_raw((bounds.0, bounds.1), dim.0, c);
+    buf.put_line_raw((bounds.0, bounds.1 + dim.1 - 1), dim.0, c);
+    for y in bounds.1..dim.1 + bounds.1 {
+        buf.put_raw((bounds.0, y), c);
+        buf.put_raw((bounds.0 + dim.0 - 1, y), c);
+    }
+
+    Ok(())
+}
+
+pub fn draw_bar(
+    buf: &mut BufferView,
+    color: Color,
+    length: u32,
+    height: u32,
+    fill: f32,
+) -> Result<(), ::std::io::Error> {
+    let mut fill_pos = ((length as f32) * fill) as u32;
+    if fill_pos > length {
+        fill_pos = length;
+    }
+    let bounds = buf.get_bounds();
+    for y in bounds.1..height + bounds.1 {
+        buf.put_line_raw((bounds.0, y), fill_pos, color);
+    }
+
+    Ok(())
+}

src/event.rs

@@ -0,0 +1,61 @@
+use std::sync::{Arc, Mutex};
+
+use calloop::ping::Ping;
+
+use crate::keyboard::KeyEvent;
+
+#[derive(Copy, Clone, Debug)]
+pub enum PointerButton {
+    Left,
+    Right,
+    Middle,
+    ScrollVertical(f64),
+    ScrollHorizontal(f64),
+}
+
+#[derive(Debug)]
+pub struct PointerEvent {
+    pub button: PointerButton,
+    pub pos: (u32, u32),
+}
+
+#[derive(Debug)]
+pub enum Event {
+    NewMinute,
+    PowerUpdate,
+    LauncherUpdate,
+    AudioUpdate,
+    KeyEvent(KeyEvent),
+    PointerEvent(PointerEvent),
+    TokenUpdate(String),
+    FocusLost,
+}
+
+pub struct Events {
+    dirty: bool,
+    events: Vec<Event>,
+    ping: Ping,
+}
+
+impl Events {
+    pub fn new(ping: Ping) -> Arc<Mutex<Events>> {
+        Arc::new(Mutex::new(Events {
+            dirty: false,
+            events: Vec::new(),
+            ping,
+        }))
+    }
+
+    pub fn add_event(&mut self, ev: Event) {
+        self.events.push(ev);
+        if !self.dirty {
+            self.dirty = true;
+            self.ping.ping();
+        }
+    }
+
+    pub fn flush(&mut self) -> Vec<Event> {
+        self.dirty = false;
+        std::mem::take(&mut self.events)
+    }
+}

src/fonts.rs

@@ -0,0 +1,162 @@
+//! Utility module for fonts
+
+use crate::draw;
+use rusttype::Font;
+use std::{
+    cell::RefCell, collections::HashMap, fs::File, hash, io::Read, mem, path::Path, rc::Rc, thread,
+};
+
+/// FontRef is used to store Fonts on widgets.
+pub type FontRef<'a> = &'a rusttype::Font<'a>;
+
+#[cfg(feature = "fontconfig")]
+pub(crate) fn find_font(name: &str) -> String {
+    use fontconfig::Fontconfig as FontConfig;
+    let fc = FontConfig::new().unwrap();
+    fc.find(name, None)
+        .unwrap()
+        .path
+        .to_str()
+        .unwrap()
+        .to_string()
+}
+
+#[cfg(not(feature = "fontconfig"))]
+pub(crate) fn find_font(_name: &str) -> String {
+    panic!("fontconfig not enabled so font search not available");
+}
+
+/// FontLoader is a marker struct that is used to load files
+pub(crate) struct FontLoader;
+
+impl FontLoader {
+    /// Given a path, loads it as a Font, which can be rendered to the screen.
+    pub(crate) fn from_path<'a, P>(path: P) -> Option<Font<'a>>
+    where
+        P: AsRef<Path>,
+    {
+        let mut file = File::open(path).expect("Font file not found");
+        let mut data = match file.metadata() {
+            Ok(metadata) => Vec::with_capacity(metadata.len() as usize),
+            Err(_) => vec![],
+        };
+        file.read_to_end(&mut data).unwrap();
+        Font::try_from_vec(data)
+    }
+}
+
+#[derive(Debug, Copy, Clone)]
+struct ComparableF32(f32);
+impl ComparableF32 {
+    fn key(&self) -> u64 {
+        self.0.to_bits() as u64
+    }
+}
+
+impl hash::Hash for ComparableF32 {
+    fn hash<H>(&self, state: &mut H)
+    where
+        H: hash::Hasher,
+    {
+        self.key().hash(state)
+    }
+}
+
+impl PartialEq for ComparableF32 {
+    fn eq(&self, other: &ComparableF32) -> bool {
+        self.key() == other.key()
+    }
+}
+
+impl Eq for ComparableF32 {}
+
+/// font name -> (font name, [(size, glyphs to preload)])
+type RequiredFonts = HashMap<&'static str, (&'static str, Vec<(f32, &'static str)>)>;
+
+pub struct FontMap {
+    fonts: HashMap<(&'static str, ComparableF32), draw::Font<'static>>,
+    font_paths: HashMap<&'static str, String>,
+    required_fonts: RequiredFonts,
+}
+
+impl FontMap {
+    pub fn new() -> FontMap {
+        FontMap {
+            fonts: HashMap::new(),
+            font_paths: HashMap::new(),
+            required_fonts: HashMap::new(),
+        }
+    }
+
+    pub fn queue_font(&mut self, font_name: &'static str, size: f32, preload: &'static str) {
+        match self.required_fonts.get_mut(font_name) {
+            Some(v) => v.1.push((size, preload)),
+            None => {
+                self.required_fonts
+                    .insert(font_name, (font_name, vec![(size, preload)]));
+            }
+        }
+    }
+
+    pub fn add_font_path(&mut self, font_name: &'static str, font_path: String) {
+        self.font_paths.insert(font_name, font_path);
+    }
+
+    pub fn load_fonts(&mut self) {
+        for (font_name, v) in self.required_fonts.iter() {
+            let path = match self.font_paths.get(font_name) {
+                Some(res) => res,
+                _ => {
+                    let s = find_font(font_name);
+                    self.font_paths.insert(font_name, s);
+                    self.font_paths.get(font_name).unwrap()
+                }
+            };
+            let fontref = Box::leak(Box::new(
+                FontLoader::from_path(path).expect("unable to load font"),
+            ));
+            for (size, preload) in &v.1 {
+                if let Some(font) = self.fonts.get_mut(&(font_name, ComparableF32(*size))) {
+                    font.add_str_to_cache(preload);
+                } else {
+                    let mut font = draw::Font::new(fontref, *size);
+                    font.add_str_to_cache(preload);
+                    self.fonts.insert((font_name, ComparableF32(*size)), font);
+                }
+            }
+        }
+    }
+
+    pub fn get_font(&mut self, font_name: &'static str, size: f32) -> &mut draw::Font<'static> {
+        self.fonts
+            .get_mut(&(font_name, ComparableF32(size)))
+            .expect("no font at specified size")
+    }
+}
+
+pub enum MaybeFontMap {
+    Waiting(thread::JoinHandle<FontMap>),
+    Ready(Rc<RefCell<FontMap>>),
+    Invalid,
+}
+
+impl MaybeFontMap {
+    pub fn unwrap(&self) -> Rc<RefCell<FontMap>> {
+        match self {
+            MaybeFontMap::Ready(f) => f.clone(),
+            _ => panic!("fontmap not yet ready"),
+        }
+    }
+
+    pub fn resolve(&mut self) {
+        if matches!(self, MaybeFontMap::Waiting(_)) {
+            let s = mem::replace(self, MaybeFontMap::Invalid);
+            match s {
+                MaybeFontMap::Waiting(handle) => {
+                    *self = MaybeFontMap::Ready(Rc::new(RefCell::new(handle.join().unwrap())));
+                }
+                _ => unreachable!(),
+            }
+        }
+    }
+}

src/keyboard/mod.rs

@@ -0,0 +1,160 @@
+//! Utilities for keymap interpretation of keyboard input
+//!
+//! This module provides an implementation for `wl_keyboard`
+//! objects using `libxkbcommon` to interpret the keyboard input
+//! given the user keymap.
+//!
+//! The entry point of this module is the [`map_keyboard`](fn.map_keyboard.html)
+//! function which, given a `wl_seat` and a callback, setup keymap interpretation
+//! and key repetition for the `wl_keyboard` of this seat.
+//!
+//! Key repetition relies on an event source, that needs to be inserted in your
+//! calloop event loop. Not doing so will prevent key repetition to work
+//! (but the rest of the functionnality will not be affected).
+
+use std::{default::Default, os::unix::io::OwnedFd};
+
+use wayland_client::{WEnum, protocol::wl_keyboard};
+use xkbcommon::xkb;
+
+pub use xkbcommon::xkb::keysyms;
+
+mod repeat;
+mod state;
+
+pub use self::repeat::{KeyRepeatSource, RepeatMessage};
+use self::state::KbState;
+pub use self::state::ModifiersState;
+
+#[derive(Debug, Clone)]
+pub struct KeyEvent {
+    #[allow(dead_code)]
+    pub rawkey: u32,
+    pub keysym: u32,
+    pub state: WEnum<wl_keyboard::KeyState>,
+    pub modifiers: ModifiersState,
+    pub utf8: Option<String>,
+    pub repeats: bool,
+}
+
+pub struct KeymapDescription {
+    fd: OwnedFd,
+    size: u32,
+}
+
+impl KeymapDescription {
+    fn new(fd: OwnedFd, size: u32) -> KeymapDescription {
+        KeymapDescription { fd, size }
+    }
+}
+
+impl Clone for KeymapDescription {
+    fn clone(&self) -> Self {
+        KeymapDescription::new(self.fd.try_clone().expect("unable to clone fd"), self.size)
+    }
+}
+
+pub struct Keyboard {
+    state: Option<KbState>,
+    desc: Option<KeymapDescription>,
+}
+
+impl Keyboard {
+    pub fn new() -> Keyboard {
+        Keyboard {
+            state: None,
+            desc: None,
+        }
+    }
+
+    pub fn keymap(&mut self, format: WEnum<wl_keyboard::KeymapFormat>, fd: OwnedFd, size: u32) {
+        match format {
+            WEnum::Value(wl_keyboard::KeymapFormat::XkbV1) => {
+                self.desc = Some(KeymapDescription::new(fd, size));
+            }
+            WEnum::Value(wl_keyboard::KeymapFormat::NoKeymap) => {
+                // TODO: how to handle this (hopefully never occuring) case?
+            }
+            // Unknown format from a newer protocol version: ignore rather than
+            // abort the whole process.
+            _ => (),
+        }
+    }
+
+    pub fn resolve(&mut self) {
+        if self.state.is_some() {
+            return;
+        }
+
+        if let Some(desc) = self.desc.take() {
+            self.state = Some(
+                KbState::new_from_fd(desc.fd, desc.size as usize).expect("unable to load keymap"),
+            );
+        }
+    }
+
+    pub fn key(&mut self, key: u32, key_state: WEnum<wl_keyboard::KeyState>) -> KeyEvent {
+        if let Some(state) = &mut self.state {
+            let (sym, utf8, repeats) = {
+                // Get the values to generate a key event
+                let sym = state.get_one_sym_raw(key);
+                let utf8 = if key_state == WEnum::Value(wl_keyboard::KeyState::Pressed) {
+                    match state.compose_feed(sym) {
+                        Some(xkb::compose::FeedResult::Accepted) => {
+                            if let Some(status) = state.compose_status() {
+                                match status {
+                                    xkb::compose::Status::Composed => state.compose_get_utf8(),
+                                    xkb::compose::Status::Nothing => state.get_utf8_raw(key),
+                                    _ => None,
+                                }
+                            } else {
+                                state.get_utf8_raw(key)
+                            }
+                        }
+                        Some(_) => {
+                            // XKB_COMPOSE_FEED_IGNORED
+                            None
+                        }
+                        None => {
+                            // XKB COMPOSE is not initialized
+                            state.get_utf8_raw(key)
+                        }
+                    }
+                } else {
+                    None
+                };
+                let repeats = state.key_repeats(xkb::Keycode::new(key + 8));
+                (sym, utf8, repeats)
+            };
+            KeyEvent {
+                rawkey: key,
+                keysym: sym,
+                state: key_state,
+                modifiers: state.mods_state(),
+                utf8,
+                repeats,
+            }
+        } else {
+            KeyEvent {
+                rawkey: key,
+                keysym: 0,
+                state: key_state,
+                modifiers: Default::default(),
+                utf8: None,
+                repeats: false,
+            }
+        }
+    }
+
+    pub fn modifiers(
+        &mut self,
+        mods_depressed: u32,
+        mods_latched: u32,
+        mods_locked: u32,
+        group: u32,
+    ) {
+        if let Some(state) = &mut self.state {
+            state.update_modifiers(mods_depressed, mods_latched, mods_locked, group);
+        }
+    }
+}

src/keyboard/repeat.rs

@@ -0,0 +1,182 @@
+use std::time::Duration;
+
+use calloop::{
+    EventSource, Poll, PostAction, Readiness, Token, TokenFactory,
+    channel::{self, Channel},
+    timer::{TimeoutAction, Timer},
+};
+use wayland_client::{WEnum, protocol::wl_keyboard};
+
+use super::KeyEvent;
+
+#[derive(Debug)]
+pub enum RepeatMessage {
+    StopRepeat,
+    KeyEvent(KeyEvent),
+    RepeatInfo((u32, u32)),
+}
+
+#[derive(Debug)]
+pub struct KeyRepeatSource {
+    channel: Channel<RepeatMessage>,
+    timer: Timer,
+    rate: Duration,
+    delay: Duration,
+    disabled: bool,
+    key: Option<KeyEvent>,
+}
+
+impl KeyRepeatSource {
+    pub fn new(ch: channel::Channel<RepeatMessage>) -> KeyRepeatSource {
+        KeyRepeatSource {
+            channel: ch,
+            timer: Timer::immediate(),
+            delay: Duration::ZERO,
+            rate: Duration::ZERO,
+            disabled: true,
+            key: None,
+        }
+    }
+}
+
+impl EventSource for KeyRepeatSource {
+    type Event = KeyEvent;
+    type Metadata = ();
+    type Ret = ();
+    type Error = calloop::Error;
+
+    fn process_events<F>(
+        &mut self,
+        readiness: Readiness,
+        token: Token,
+        mut callback: F,
+    ) -> calloop::Result<PostAction>
+    where
+        F: FnMut(Self::Event, &mut Self::Metadata) -> Self::Ret,
+    {
+        let mut removed = false;
+
+        let timer = &mut self.timer;
+        let rate = &mut self.rate;
+        let delay = &mut self.delay;
+        let key = &mut self.key;
+        let disabled = &mut self.disabled;
+
+        let mut reregister = false;
+
+        let now = std::time::Instant::now();
+
+        // Check if the key repeat should stop
+        let channel_pa = self
+            .channel
+            .process_events(readiness, token, |event, _| match event {
+                channel::Event::Msg(message) => match message {
+                    RepeatMessage::StopRepeat => {
+                        key.take();
+                    }
+                    RepeatMessage::KeyEvent(event) => match event.state {
+                        WEnum::Value(wl_keyboard::KeyState::Pressed) => {
+                            key.replace(event);
+                            reregister = true;
+                            timer.set_deadline(now + *delay);
+                        }
+                        WEnum::Value(wl_keyboard::KeyState::Released) => match key {
+                            Some(k) if k.keysym == event.keysym => {
+                                key.take();
+                            }
+                            _ => (),
+                        },
+                        _ => (),
+                    },
+                    RepeatMessage::RepeatInfo((new_rate, new_delay)) => {
+                        // Per wl_keyboard.repeat_info, a rate of 0 disables
+                        // key repeat entirely. Dividing by it would panic.
+                        if new_rate == 0 {
+                            *disabled = true;
+                            key.take();
+                        } else {
+                            *rate = Duration::from_micros(1_000_000 / new_rate as u64);
+                            *delay = Duration::from_millis(new_delay as u64);
+                            *disabled = false;
+                            if key.is_some() {
+                                timer.set_deadline(now + *delay);
+                            }
+                        }
+                    }
+                },
+
+                channel::Event::Closed => {
+                    removed = true;
+                }
+            })
+            .map_err(|err| calloop::Error::OtherError(Box::new(err)))?;
+
+        // Keyboard was destroyed
+        if removed {
+            return Ok(PostAction::Remove);
+        }
+
+        // Re-register the timer to start it again
+        if reregister {
+            return Ok(PostAction::Reregister);
+        }
+
+        let timer_pa = timer.process_events(readiness, token, |deadline, _| {
+            if self.disabled || key.is_none() {
+                return TimeoutAction::Drop;
+            }
+            if deadline - now > std::time::Duration::from_millis(5) {
+                // We have not yet reached the deadline within our tolerance
+                return TimeoutAction::ToInstant(deadline);
+            }
+
+            // Invoke the event
+            callback(key.as_ref().unwrap().clone(), &mut ());
+
+            let mut next_deadline = deadline;
+            if now - deadline > *rate * 2 {
+                // We're way behind, let's just set a new time
+                println!(
+                    "KeyRepeatSource::process_events: More than two repeat cycles behind, resetting"
+                );
+                next_deadline = now + *rate;
+            } else {
+                while next_deadline < now {
+                    next_deadline += *rate;
+                }
+            }
+            TimeoutAction::ToInstant(next_deadline)
+        })?;
+
+        // Only disable or remove if both want to, otherwise continue or re-register
+        Ok(match (timer_pa, channel_pa) {
+            (PostAction::Disable, PostAction::Disable) => PostAction::Disable,
+            (PostAction::Remove, PostAction::Remove) => PostAction::Remove,
+            (PostAction::Reregister, _) | (_, PostAction::Reregister) => PostAction::Reregister,
+            _ => PostAction::Continue,
+        })
+    }
+
+    fn register(
+        &mut self,
+        poll: &mut Poll,
+        token_factory: &mut TokenFactory,
+    ) -> calloop::Result<()> {
+        self.channel.register(poll, token_factory)?;
+        self.timer.register(poll, token_factory)
+    }
+
+    fn reregister(
+        &mut self,
+        poll: &mut Poll,
+        token_factory: &mut TokenFactory,
+    ) -> calloop::Result<()> {
+        self.channel.reregister(poll, token_factory)?;
+        self.timer.reregister(poll, token_factory)
+    }
+
+    fn unregister(&mut self, poll: &mut Poll) -> calloop::Result<()> {
+        self.channel.unregister(poll)?;
+        self.timer.unregister(poll)
+    }
+}

src/keyboard/state.rs

@@ -0,0 +1,161 @@
+use std::{env, os::unix::io::OwnedFd};
+
+use xkbcommon::xkb;
+
+pub struct KbState {
+    xkb_context: xkb::Context,
+    xkb_keymap: xkb::Keymap,
+    xkb_state: xkb::State,
+    xkb_compose_table: Option<xkb::compose::Table>,
+    xkb_compose_state: Option<xkb::compose::State>,
+    mods_state: ModifiersState,
+}
+
+/// Represents the current state of the keyboard modifiers
+///
+/// Each field of this struct represents a modifier and is `true` if this modifier is active.
+///
+/// For some modifiers, this means that the key is currently pressed, others are toggled
+/// (like caps lock).
+#[derive(Copy, Clone, Debug, Default)]
+pub struct ModifiersState {
+    /// The "control" key
+    pub ctrl: bool,
+    /// The "alt" key
+    pub alt: bool,
+    /// The "shift" key
+    pub shift: bool,
+    /// The "Caps lock" key
+    pub caps_lock: bool,
+    /// The "logo" key
+    ///
+    /// Also known as the "windows" key on most keyboards
+    pub logo: bool,
+    /// The "Num lock" key
+    pub num_lock: bool,
+}
+
+impl ModifiersState {
+    fn new() -> ModifiersState {
+        ModifiersState::default()
+    }
+
+    fn update_with(&mut self, state: &xkb::State) {
+        self.ctrl = state.mod_name_is_active("Control", xkb::STATE_MODS_EFFECTIVE);
+        self.alt = state.mod_name_is_active("Mod1", xkb::STATE_MODS_EFFECTIVE);
+        self.shift = state.mod_name_is_active("Shift", xkb::STATE_MODS_EFFECTIVE);
+        self.caps_lock = state.mod_name_is_active("Lock", xkb::STATE_MODS_EFFECTIVE);
+        self.num_lock = state.mod_name_is_active("Mod2", xkb::STATE_MODS_EFFECTIVE);
+        self.logo = state.mod_name_is_active("Mod4", xkb::STATE_MODS_EFFECTIVE);
+    }
+}
+
+// Safety: No.
+unsafe impl Send for KbState {}
+
+impl KbState {
+    pub(crate) fn update_modifiers(
+        &mut self,
+        mods_depressed: u32,
+        mods_latched: u32,
+        mods_locked: u32,
+        group: u32,
+    ) {
+        let mask =
+            self.xkb_state
+                .update_mask(mods_depressed, mods_latched, mods_locked, 0, 0, group);
+        if (mask & xkb::STATE_MODS_EFFECTIVE) > 0 {
+            // effective value of mods have changed, we need to update our state
+            self.mods_state.update_with(&self.xkb_state);
+        }
+    }
+
+    pub(crate) fn get_one_sym_raw(&mut self, keycode: u32) -> u32 {
+        self.xkb_state
+            .key_get_one_sym(xkb::Keycode::new(keycode + 8))
+            .raw()
+    }
+
+    pub(crate) fn get_utf8_raw(&mut self, keycode: u32) -> Option<String> {
+        Some(self.xkb_state.key_get_utf8(xkb::Keycode::new(keycode + 8)))
+    }
+
+    pub(crate) fn compose_feed(&mut self, keysym: u32) -> Option<xkb::compose::FeedResult> {
+        self.xkb_compose_state
+            .as_mut()
+            .map(|compose_state| compose_state.feed(xkb::Keysym::new(keysym)))
+    }
+
+    pub(crate) fn compose_status(&mut self) -> Option<xkb::compose::Status> {
+        self.xkb_compose_state
+            .as_mut()
+            .map(|compose_state| compose_state.status())
+    }
+
+    pub(crate) fn compose_get_utf8(&mut self) -> Option<String> {
+        match &mut self.xkb_compose_state {
+            Some(compose_state) => compose_state.utf8(),
+            None => None,
+        }
+    }
+
+    pub(crate) fn new_from_fd(fd: OwnedFd, size: usize) -> Result<KbState, std::io::Error> {
+        let xkb_context = xkb::Context::new(xkb::CONTEXT_NO_FLAGS);
+        let xkb_keymap = unsafe {
+            xkb::Keymap::new_from_fd(
+                &xkb_context,
+                fd,
+                size,
+                xkb::KEYMAP_FORMAT_TEXT_V1,
+                xkb::KEYMAP_COMPILE_NO_FLAGS,
+            )?
+            .unwrap()
+        };
+        let xkb_state = xkb::State::new(&xkb_keymap);
+        let mut me = KbState {
+            xkb_context,
+            xkb_keymap,
+            xkb_state,
+            xkb_compose_table: None,
+            xkb_compose_state: None,
+            mods_state: ModifiersState::new(),
+        };
+
+        me.init_compose();
+
+        Ok(me)
+    }
+
+    pub(crate) fn init_compose(&mut self) {
+        let locale = env::var_os("LC_ALL")
+            .filter(|v| !v.is_empty())
+            .or_else(|| env::var_os("LC_CTYPE"))
+            .filter(|v| !v.is_empty())
+            .or_else(|| env::var_os("LANG"))
+            .filter(|v| !v.is_empty())
+            .unwrap_or_else(|| "C".into());
+
+        let compose_table = match xkb::compose::Table::new_from_locale(
+            &self.xkb_context,
+            &locale,
+            xkb::compose::COMPILE_NO_FLAGS,
+        ) {
+            Ok(t) => t,
+            Err(_) => return,
+        };
+
+        let compose_state = xkb::compose::State::new(&compose_table, xkb::compose::STATE_NO_FLAGS);
+
+        self.xkb_compose_table = Some(compose_table);
+        self.xkb_compose_state = Some(compose_state);
+    }
+
+    pub(crate) fn key_repeats(&mut self, keycode: xkb::Keycode) -> bool {
+        self.xkb_keymap.key_repeats(keycode)
+    }
+
+    #[inline]
+    pub(crate) fn mods_state(&self) -> ModifiersState {
+        self.mods_state
+    }
+}

src/main.rs

@@ -0,0 +1,392 @@
+mod buffer;
+mod color;
+mod config;
+mod draw;
+mod event;
+mod fonts;
+mod keyboard;
+mod state;
+mod utils;
+mod widgets;
+
+use wayland_client::{Connection, QueueHandle, WaylandSource};
+
+use calloop::{
+    EventLoop,
+    timer::{TimeoutAction, Timer},
+};
+use chrono::{Duration, Local, Timelike};
+
+use buffer::BufferView;
+use config::Config;
+use event::{Event, Events};
+use fonts::{FontMap, MaybeFontMap};
+use keyboard::{KeyRepeatSource, RepeatMessage};
+use state::State;
+use utils::xdg;
+use widgets::{Geometry, Widget};
+
+use std::{
+    env, fs,
+    fs::File,
+    io::{BufRead, BufReader, Write},
+    os::unix::net::{UnixListener, UnixStream},
+    path::Path,
+    rc::Rc,
+    thread,
+};
+
+fn print_usage() {
+    println!(
+        "
+usage: wldash [OPTIONS]
+
+OPTIONS:
+  --config CONFIG_FILE                     use the specified config file
+                                           (/etc/wldash/config.yml if present,
+                                           else ~/.config/wldash/config.yml)
+  --write-default-config [v1|v2|toplevel]  generate and write a new config file
+                                           (v2 by default)
+  --desktop-refresh                        no-op kept for old key bindings
+                                           (desktop files are scanned at start)
+"
+    );
+}
+
+fn die(msg: String) -> ! {
+    eprintln!("wldash: {}", msg);
+    std::process::exit(1);
+}
+
+fn ensure_dir_exists(path: &str) {
+    if let Err(err) = fs::create_dir_all(path) {
+        die(format!("error creating directory {}: {}", path, err));
+    }
+}
+
+fn create_required_directories() {
+    let dir_config_wldash = format!("{}/wldash", xdg::config_folder());
+    ensure_dir_exists(&dir_config_wldash);
+}
+
+/// Default config path. On a shared (e.g. NFS-roamed) home, a host-specific
+/// config at /etc/wldash/config.yml takes precedence over the roamed
+/// ~/.config/wldash/config.yml, so each machine can keep its own layout
+/// without conflicting. An explicit --config still overrides both.
+fn default_config_file() -> String {
+    let etc = "/etc/wldash/config.yml";
+    if Path::new(etc).exists() {
+        return etc.to_string();
+    }
+    format!("{}/wldash/config.yml", xdg::config_folder())
+}
+
+fn main() {
+    let mut args = env::args();
+    // Skip program name
+    _ = args.next();
+
+    create_required_directories();
+
+    let mut config_file = default_config_file();
+
+    loop {
+        match args.next() {
+            Some(ref s) if s == "--config" => match args.next() {
+                Some(ref s) => config_file = s.clone(),
+                None => die("missing argument to --config".to_string()),
+            },
+            Some(ref s) if s == "--write-default-config" => {
+                let config = match args.next() {
+                    Some(ref s) if s == "v1" => Config::generate_v1(),
+                    Some(ref s) if s == "v2" => Config::generate_v2(false),
+                    Some(ref s) if s == "toplevel" => Config::generate_v2(true),
+                    None => Config::generate_v2(false),
+                    Some(s) => die(format!("unknown argument to --write-default-config: {}", s)),
+                };
+                match File::create(&config_file) {
+                    Ok(f) => {
+                        if let Err(e) = serde_yaml::to_writer(f, &config) {
+                            die(format!("could not serialize config: {}", e));
+                        }
+                    }
+                    Err(e) => die(format!("could not write {}: {}", config_file, e)),
+                }
+                std::process::exit(0);
+            }
+            Some(ref s) if s == "--desktop-refresh" => {
+                eprintln!("wldash: desktop files are scanned at every start; nothing to refresh");
+                std::process::exit(0);
+            }
+            Some(ref s) if s == "--help" => {
+                print_usage();
+                std::process::exit(0);
+            }
+            Some(_) => {
+                print_usage();
+                std::process::exit(1);
+            }
+            None => break,
+        }
+    }
+
+    let conn = match Connection::connect_to_env() {
+        Ok(c) => c,
+        Err(e) => die(format!("could not connect to the Wayland display: {}", e)),
+    };
+
+    let event_queue = conn.new_event_queue();
+    let qhandle: QueueHandle<State> = event_queue.handle();
+
+    let display = conn.display();
+    display.get_registry(&qhandle, ());
+    display.sync(&qhandle, ());
+
+    let (ping_sender, ping_source) = calloop::ping::make_ping().unwrap();
+    let (keyrepeat_sender, keyrepeat_channel) = calloop::channel::channel::<RepeatMessage>();
+
+    let mut event_loop: EventLoop<State> =
+        EventLoop::try_new().expect("Failed to initialize the event loop!");
+
+    let handle = event_loop.handle();
+    handle
+        .insert_source(
+            WaylandSource::new(event_queue).expect("Could not create WaylandSource!"),
+            |_event, queue, state| queue.dispatch_pending(state),
+        )
+        .expect("Failed to insert event source!");
+
+    handle
+        .insert_source(ping_source, |(), &mut (), state| {
+            let events = state.events.lock().unwrap().flush();
+            for widget in state.widgets.iter_mut() {
+                for event in events.iter() {
+                    widget.event(event);
+                }
+            }
+            state.dirty = true;
+        })
+        .expect("Failed to insert ping source!");
+
+    let clock_source = Timer::from_duration(std::time::Duration::from_secs(1));
+    handle
+        .insert_source(clock_source, |_event, _metadata, state| {
+            let now = Local::now().naive_local();
+            let target = (now + Duration::seconds(60))
+                .with_second(0)
+                .unwrap()
+                .with_nanosecond(0)
+                .unwrap();
+            let d = target - now;
+            for widget in state.widgets.iter_mut() {
+                widget.event(&Event::NewMinute);
+            }
+            state.dirty = true;
+
+            // The timer event source requires us to return a TimeoutAction to
+            // specify if the timer should be rescheduled. In our case we just drop it.
+            TimeoutAction::ToDuration(d.to_std().unwrap())
+        })
+        .expect("Failed to insert event source!");
+
+    let keyrepeat_source = KeyRepeatSource::new(keyrepeat_channel);
+    handle
+        .insert_source(keyrepeat_source, |event, _metadata, state| {
+            let ev = Event::KeyEvent(event);
+            for widget in state.widgets.iter_mut() {
+                widget.event(&ev);
+            }
+            state.dirty = true;
+        })
+        .expect("Failed to insert keyrepeat source!");
+
+    let socket_path = match env::var("XDG_RUNTIME_DIR") {
+        Ok(dir) => dir + "/wldash",
+        Err(_) => "/tmp/wldash".to_string(),
+    };
+
+    let events = Events::new(ping_sender);
+
+    let mut fm = FontMap::new();
+
+    let config: Config = match File::open(&config_file) {
+        Ok(f) => match serde_yaml::from_reader(f) {
+            Ok(c) => c,
+            Err(e) => die(format!("invalid configuration {}: {}", config_file, e)),
+        },
+        Err(e) => die(format!(
+            "could not open configuration {}: {} (try 'wldash --write-default-config')",
+            config_file, e
+        )),
+    };
+
+    if let Some(true) = config.server {
+        if let Ok(mut socket) = UnixStream::connect(socket_path.clone()) {
+            socket.write_all(b"kill\n").unwrap();
+            return;
+        };
+
+        let _ = std::fs::remove_file(socket_path.clone());
+        let _ = thread::Builder::new()
+            .name("ipc_server".to_string())
+            .spawn(move || {
+                let listener = UnixListener::bind(socket_path.clone()).unwrap();
+                loop {
+                    if let Ok((stream, _)) = listener.accept() {
+                        let _ = thread::Builder::new().name("ipc_client".to_string()).spawn(
+                            move || {
+                                let r = BufReader::new(stream);
+                                for line in r.lines() {
+                                    match line {
+                                        Ok(ref cmd) if cmd == "kill" => {
+                                            std::process::exit(0);
+                                        }
+                                        _ => {}
+                                    }
+                                }
+                            },
+                        );
+                    }
+                }
+            });
+    }
+
+    if let Some(font_paths) = config.font_paths {
+        for (key, value) in font_paths.into_iter() {
+            fm.add_font_path(Box::leak(key.into_boxed_str()), value);
+        }
+    }
+
+    let layout = Rc::new(config.widget.construct_layout(&mut 0));
+    let mut widgets: Vec<Box<dyn Widget>> = Vec::new();
+    config
+        .widget
+        .construct_widgets(&mut widgets, &mut fm, &events);
+
+    let font_thread = thread::Builder::new()
+        .name("fontloader".to_string())
+        .spawn(move || {
+            fm.load_fonts();
+            fm
+        })
+        .unwrap();
+
+    let mut state = State::new(
+        config.mode,
+        config.background,
+        widgets,
+        layout,
+        MaybeFontMap::Waiting(font_thread),
+        events,
+        keyrepeat_sender,
+    );
+
+    // Initial setup
+    //
+    while state.running && !state.ready {
+        event_loop
+            .dispatch(None, &mut state)
+            .expect("Could not dispatch event loop");
+    }
+    state.check_registry(&qhandle);
+
+    while state.running {
+        event_loop
+            .dispatch(None, &mut state)
+            .expect("Could not dispatch event loop");
+
+        if !state.configured || !state.dirty || !state.ready {
+            continue;
+        }
+
+        let mut force = false;
+        if state.bufmgr.buffers.is_empty() {
+            state.add_buffer(&qhandle);
+            force = true;
+        }
+
+        let mut bufcnt = state.bufmgr.buffers.len();
+        let buf = match state.bufmgr.next_buffer() {
+            Some(b) => b,
+            None => {
+                if state.bufmgr.buffers.len() >= 3 {
+                    continue;
+                }
+                state.add_buffer(&qhandle);
+                bufcnt = state.bufmgr.buffers.len();
+
+                match state.bufmgr.next_buffer() {
+                    Some(b) => b,
+                    None => {
+                        continue;
+                    }
+                }
+            }
+        };
+
+        if buf.last_damage.is_empty() {
+            for _ in 0..state.widgets.len() {
+                buf.last_damage.push(Geometry::new());
+            }
+        }
+
+        state.dirty = false;
+        buf.acquire();
+        let mut bufview = BufferView::new(
+            &mut buf.mmap,
+            (state.dimensions.0 as u32, state.dimensions.1 as u32),
+        );
+
+        let surface = state.main_surface.wl_surface.as_ref().unwrap().clone();
+        if force {
+            for (idx, widget) in state.widgets.iter_mut().enumerate() {
+                if force || widget.get_dirty() {
+                    let geo = widget.geometry();
+                    let mut subview = bufview.subgeometry(geo);
+                    buf.last_damage[idx] =
+                        widget.draw(&mut state.fonts.unwrap().borrow_mut(), &mut subview);
+                }
+            }
+            surface.damage_buffer(0, 0, 0x7FFFFFFF, 0x7FFFFFFF);
+        } else {
+            let mut drew = false;
+            for (idx, widget) in state.widgets.iter_mut().enumerate() {
+                if bufcnt > 1 || widget.get_dirty() {
+                    drew = true;
+
+                    let old_damage = buf.last_damage[idx];
+                    bufview.subgeometry(old_damage).clear();
+
+                    let geo = widget.geometry();
+                    let mut subview = bufview.subgeometry(geo);
+
+                    let new_damage =
+                        widget.draw(&mut state.fonts.unwrap().borrow_mut(), &mut subview);
+                    let combined_damage = new_damage.expand(old_damage);
+                    buf.last_damage[idx] = new_damage;
+
+                    surface.damage_buffer(
+                        combined_damage.x as i32,
+                        combined_damage.y as i32,
+                        combined_damage.width as i32,
+                        combined_damage.height as i32,
+                    );
+                }
+            }
+            if !drew {
+                buf.release();
+                conn.flush().unwrap();
+                continue;
+            }
+        }
+
+        state.ready = false;
+        surface.attach(Some(&buf.buffer), 0, 0);
+        surface.frame(&qhandle, ());
+        surface.commit();
+        conn.flush().unwrap();
+
+        // Now is a good as time as any to load the keymap
+        state.keyboard.resolve();
+    }
+}

src/state.rs

@@ -0,0 +1,859 @@
+use std::{
+    cmp::max,
+    default::Default,
+    env,
+    rc::Rc,
+    sync::{Arc, Mutex},
+};
+
+use wayland_client::{
+    Connection, Dispatch, QueueHandle, WEnum,
+    protocol::{
+        wl_buffer, wl_callback, wl_compositor, wl_keyboard, wl_pointer, wl_registry, wl_seat,
+        wl_shm, wl_shm_pool, wl_subcompositor, wl_subsurface, wl_surface,
+    },
+};
+
+use wayland_protocols::{
+    wp::{
+        single_pixel_buffer::v1::client::wp_single_pixel_buffer_manager_v1,
+        viewporter::client::{wp_viewport, wp_viewporter},
+    },
+    xdg::{
+        activation::v1::client::{xdg_activation_token_v1, xdg_activation_v1},
+        shell::client::{xdg_surface, xdg_toplevel, xdg_wm_base},
+    },
+};
+
+use wayland_protocols_wlr::layer_shell::v1::client::{zwlr_layer_shell_v1, zwlr_layer_surface_v1};
+
+use crate::{
+    buffer::BufferManager,
+    config::OperationMode,
+    event::{Event, Events, PointerButton, PointerEvent},
+    fonts::{FontMap, MaybeFontMap},
+    keyboard::{Keyboard, RepeatMessage},
+    widgets::{Geometry, Layout, Widget, WidgetUpdater},
+};
+
+use calloop::channel::Sender;
+
+#[derive(Default)]
+pub struct MainSurface {
+    pub wl_surface: Option<wl_surface::WlSurface>,
+    xdg_surface: Option<(xdg_surface::XdgSurface, xdg_toplevel::XdgToplevel)>,
+    layer_surface: Option<zwlr_layer_surface_v1::ZwlrLayerSurfaceV1>,
+}
+
+#[derive(Default)]
+pub struct BackgroundSurface {
+    wl_surface: Option<wl_surface::WlSurface>,
+    subsurface: Option<wl_subsurface::WlSubsurface>,
+    viewport: Option<wp_viewport::WpViewport>,
+}
+
+#[derive(Default)]
+pub struct Protocols {
+    wl_compositor: Option<wl_compositor::WlCompositor>,
+    wl_subcompositor: Option<wl_subcompositor::WlSubcompositor>,
+    wl_shm: Option<wl_shm::WlShm>,
+    xdg_wm_base: Option<xdg_wm_base::XdgWmBase>,
+    xdg_activation: Option<xdg_activation_v1::XdgActivationV1>,
+    zwlr_layer_shell: Option<zwlr_layer_shell_v1::ZwlrLayerShellV1>,
+    viewporter: Option<wp_viewporter::WpViewporter>,
+    wp_single_pixel_buffer_manager:
+        Option<wp_single_pixel_buffer_manager_v1::WpSinglePixelBufferManagerV1>,
+}
+
+pub struct State {
+    mode: OperationMode,
+    background: Option<u32>,
+    pub main_surface: MainSurface,
+    pub bg_surface: BackgroundSurface,
+    pub protocols: Protocols,
+    pub running: bool,
+    pub ready: bool,
+    pub dirty: bool,
+    activated: bool,
+    pub configured: bool,
+    pub dimensions: (i32, i32),
+    pub bufmgr: BufferManager,
+    pub widgets: Vec<Box<dyn Widget>>,
+    pub keyboard: Keyboard,
+    pub keyrepeat_sender: Sender<RepeatMessage>,
+    pointer: Option<(f64, f64)>,
+    pub fonts: MaybeFontMap,
+    pub events: Arc<Mutex<Events>>,
+    layout: Rc<Box<dyn Layout>>,
+}
+
+impl State {
+    pub fn new(
+        mode: OperationMode,
+        background: Option<u32>,
+        widgets: Vec<Box<dyn Widget>>,
+        layout: Rc<Box<dyn Layout>>,
+        fonts: MaybeFontMap,
+        events: Arc<Mutex<Events>>,
+        keyrepeat_sender: Sender<RepeatMessage>,
+    ) -> State {
+        State {
+            protocols: Default::default(),
+            bg_surface: Default::default(),
+            main_surface: Default::default(),
+            running: true,
+            dirty: true,
+            activated: false,
+            configured: false,
+            dimensions: (320, 240),
+            bufmgr: BufferManager::new(),
+            keyboard: Keyboard::new(),
+            pointer: None,
+            keyrepeat_sender,
+            mode,
+            background,
+            widgets,
+            fonts,
+            events,
+            layout,
+            ready: false,
+        }
+    }
+
+    pub fn add_buffer(&mut self, qh: &QueueHandle<Self>) {
+        self.bufmgr.add_buffer(
+            self.protocols.wl_shm.as_ref().expect("missing wl_shm"),
+            self.dimensions,
+            qh,
+        );
+    }
+
+    pub fn activate(&mut self, qh: &QueueHandle<Self>) {
+        let key = match env::var("XDG_ACTIVATION_TOKEN") {
+            Ok(token) => token,
+            Err(_) => return,
+        };
+        if let (Some(surface), Some(activation)) = (
+            &self.main_surface.wl_surface,
+            &self.protocols.xdg_activation,
+        ) {
+            activation.activate(key, surface);
+            let activation_token = activation.get_activation_token(qh, ());
+            activation_token.commit();
+            unsafe {
+                env::remove_var("XDG_ACTIVATION_TOKEN");
+            }
+        }
+    }
+}
+
+impl WidgetUpdater for State {
+    fn geometry_update(
+        &mut self,
+        idx: usize,
+        fonts: &mut FontMap,
+        geometry: &Geometry,
+    ) -> Geometry {
+        self.widgets[idx].geometry_update(fonts, geometry)
+    }
+
+    fn minimum_size(&mut self, idx: usize, fonts: &mut FontMap) -> Geometry {
+        self.widgets[idx].minimum_size(fonts)
+    }
+}
+
+impl State {
+    pub fn check_registry(&mut self, qh: &QueueHandle<Self>) {
+        let wl_compositor = self
+            .protocols
+            .wl_compositor
+            .as_ref()
+            .expect("wl_compositor missing");
+        let main_surface = wl_compositor.create_surface(qh, ());
+        let bg_surface = wl_compositor.create_surface(qh, ());
+        self.main_surface.wl_surface = Some(main_surface.clone());
+        self.bg_surface.wl_surface = Some(bg_surface.clone());
+        self.activate(qh);
+
+        let wl_subcompositor = self
+            .protocols
+            .wl_subcompositor
+            .as_ref()
+            .expect("wl_subcompositor missing");
+        let subsurface = wl_subcompositor.get_subsurface(&bg_surface, &main_surface, qh, ());
+        subsurface.place_below(&main_surface);
+        self.bg_surface.subsurface = Some(subsurface.clone());
+
+        match self.mode {
+            OperationMode::XdgToplevel => {
+                self.fonts.resolve();
+                let xdg_wm_base = self
+                    .protocols
+                    .xdg_wm_base
+                    .as_ref()
+                    .expect("xdg_wm_base missing");
+                let xdg_surface = xdg_wm_base.get_xdg_surface(&main_surface, qh, ());
+                let toplevel = xdg_surface.get_toplevel(qh, ());
+                toplevel.set_title("wldash".into());
+                main_surface.commit();
+
+                self.main_surface.xdg_surface = Some((xdg_surface, toplevel));
+            }
+            OperationMode::LayerSurface(size) => {
+                self.fonts.resolve();
+                let layer_shell = self
+                    .protocols
+                    .zwlr_layer_shell
+                    .as_ref()
+                    .expect("zwlr_layer_shell_v1 missing");
+                let layer_surface = layer_shell.get_layer_surface(
+                    &main_surface,
+                    None,
+                    zwlr_layer_shell_v1::Layer::Overlay,
+                    "launcher".to_string(),
+                    qh,
+                    (),
+                );
+                let fonts = self.fonts.unwrap();
+                let layout = self.layout.clone();
+                let min_size = layout.minimum_size(&mut fonts.borrow_mut(), self);
+                layer_surface.set_keyboard_interactivity(
+                    zwlr_layer_surface_v1::KeyboardInteractivity::Exclusive,
+                );
+                layer_surface.set_anchor(
+                    zwlr_layer_surface_v1::Anchor::Left
+                        .union(zwlr_layer_surface_v1::Anchor::Bottom)
+                        .union(zwlr_layer_surface_v1::Anchor::Right)
+                        .union(zwlr_layer_surface_v1::Anchor::Top),
+                );
+                layer_surface.set_size(max(size.0, min_size.width), max(size.1, min_size.height));
+
+                main_surface.commit();
+                self.main_surface.layer_surface = Some(layer_surface);
+            }
+        }
+
+        let viewporter = self
+            .protocols
+            .viewporter
+            .as_ref()
+            .expect("wp_viewporter missing");
+        let viewport = viewporter.get_viewport(&bg_surface, qh, ());
+        self.bg_surface.viewport = Some(viewport);
+
+        if let Some(background) = self.background {
+            let wp_single_pixel_buffer_manager = self
+                .protocols
+                .wp_single_pixel_buffer_manager
+                .as_ref()
+                .expect("wp_single_pixel_buffer_manager_v1 missing");
+            let buffer =
+                wp_single_pixel_buffer_manager.create_u32_rgba_buffer(0, 0, 0, background, qh, ());
+            bg_surface.attach(Some(&buffer), 0, 0);
+            bg_surface.damage_buffer(0, 0, 1, 1);
+        }
+    }
+}
+
+impl Dispatch<wl_registry::WlRegistry, ()> for State {
+    fn event(
+        state: &mut Self,
+        registry: &wl_registry::WlRegistry,
+        event: wl_registry::Event,
+        _: &(),
+        _: &Connection,
+        qh: &QueueHandle<Self>,
+    ) {
+        if let wl_registry::Event::Global {
+            name, interface, ..
+        } = event
+        {
+            match &interface[..] {
+                "wl_compositor" => {
+                    state.protocols.wl_compositor =
+                        Some(registry.bind::<wl_compositor::WlCompositor, _, _>(name, 5, qh, ()));
+                }
+                "wl_subcompositor" => {
+                    state.protocols.wl_subcompositor = Some(
+                        registry.bind::<wl_subcompositor::WlSubcompositor, _, _>(name, 1, qh, ()),
+                    );
+                }
+                "wl_shm" => {
+                    state.protocols.wl_shm =
+                        Some(registry.bind::<wl_shm::WlShm, _, _>(name, 1, qh, ()));
+                }
+                "wl_seat" => {
+                    registry.bind::<wl_seat::WlSeat, _, _>(name, 8, qh, ());
+                }
+                "xdg_wm_base" => {
+                    if let OperationMode::XdgToplevel = state.mode {
+                        state.protocols.xdg_wm_base =
+                            Some(registry.bind::<xdg_wm_base::XdgWmBase, _, _>(name, 2, qh, ()));
+                    }
+                }
+                "xdg_activation_v1" => {
+                    state.protocols.xdg_activation = Some(
+                        registry.bind::<xdg_activation_v1::XdgActivationV1, _, _>(name, 1, qh, ()),
+                    );
+                }
+                "zwlr_layer_shell_v1" => {
+                    if let OperationMode::LayerSurface(_) = state.mode {
+                        state.protocols.zwlr_layer_shell = Some(
+                            registry.bind::<zwlr_layer_shell_v1::ZwlrLayerShellV1, _, _>(
+                                name,
+                                4,
+                                qh,
+                                (),
+                            ),
+                        );
+                    }
+                }
+                "wp_viewporter" => {
+                    state.protocols.viewporter =
+                        Some(registry.bind::<wp_viewporter::WpViewporter, _, _>(name, 1, qh, ()));
+                }
+                "wp_single_pixel_buffer_manager_v1" => {
+                    state.protocols.wp_single_pixel_buffer_manager = Some(registry.bind::<wp_single_pixel_buffer_manager_v1::WpSinglePixelBufferManagerV1, _, _>(name, 1, qh, ()));
+                }
+                _ => {}
+            }
+        }
+    }
+}
+
+impl Dispatch<wl_callback::WlCallback, ()> for State {
+    fn event(
+        state: &mut Self,
+        _: &wl_callback::WlCallback,
+        event: wl_callback::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<Self>,
+    ) {
+        if let wl_callback::Event::Done { callback_data: _ } = event {
+            state.ready = true
+        }
+    }
+}
+
+impl Dispatch<wl_compositor::WlCompositor, ()> for State {
+    fn event(
+        _: &mut Self,
+        _: &wl_compositor::WlCompositor,
+        _: wl_compositor::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<Self>,
+    ) {
+    }
+}
+
+impl Dispatch<wl_subcompositor::WlSubcompositor, ()> for State {
+    fn event(
+        _: &mut Self,
+        _: &wl_subcompositor::WlSubcompositor,
+        _: wl_subcompositor::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<Self>,
+    ) {
+    }
+}
+
+impl Dispatch<wl_surface::WlSurface, ()> for State {
+    fn event(
+        _: &mut Self,
+        _: &wl_surface::WlSurface,
+        _: wl_surface::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<Self>,
+    ) {
+    }
+}
+
+impl Dispatch<wl_subsurface::WlSubsurface, ()> for State {
+    fn event(
+        _: &mut Self,
+        _: &wl_subsurface::WlSubsurface,
+        _: wl_subsurface::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<Self>,
+    ) {
+    }
+}
+
+impl Dispatch<wl_shm::WlShm, ()> for State {
+    fn event(
+        _: &mut Self,
+        _: &wl_shm::WlShm,
+        _: wl_shm::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<Self>,
+    ) {
+    }
+}
+
+impl Dispatch<wl_shm_pool::WlShmPool, ()> for State {
+    fn event(
+        _: &mut Self,
+        _: &wl_shm_pool::WlShmPool,
+        _: wl_shm_pool::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<Self>,
+    ) {
+    }
+}
+
+impl Dispatch<wl_buffer::WlBuffer, ()> for State {
+    fn event(
+        state: &mut Self,
+        buffer: &wl_buffer::WlBuffer,
+        _: wl_buffer::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<Self>,
+    ) {
+        for buf in state.bufmgr.buffers.iter_mut() {
+            if &buf.buffer == buffer {
+                buf.release();
+            }
+        }
+    }
+}
+
+impl Dispatch<zwlr_layer_shell_v1::ZwlrLayerShellV1, ()> for State {
+    fn event(
+        _: &mut Self,
+        _: &zwlr_layer_shell_v1::ZwlrLayerShellV1,
+        _: zwlr_layer_shell_v1::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<Self>,
+    ) {
+    }
+}
+
+impl Dispatch<zwlr_layer_surface_v1::ZwlrLayerSurfaceV1, ()> for State {
+    fn event(
+        state: &mut Self,
+        layer_surface: &zwlr_layer_surface_v1::ZwlrLayerSurfaceV1,
+        event: zwlr_layer_surface_v1::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<Self>,
+    ) {
+        match event {
+            zwlr_layer_surface_v1::Event::Configure {
+                serial,
+                mut width,
+                mut height,
+            } => {
+                if (width, height) == (0, 0) {
+                    if state.configured {
+                        return;
+                    }
+                    (width, height) = (640, 480);
+                }
+                layer_surface.ack_configure(serial);
+                let first_configure = !state.configured;
+                state.configured = true;
+                state.dirty = true;
+
+                let dim = (width as i32, height as i32);
+
+                // Always lay out on the first configure, even if the
+                // compositor happens to hand us our placeholder dimensions.
+                if !first_configure && state.dimensions == dim {
+                    return;
+                }
+                state.bufmgr.clear_buffers();
+                state.dimensions = dim;
+                let fonts = state.fonts.unwrap();
+                let layout = state.layout.clone();
+                layout.geometry_update(
+                    &mut fonts.borrow_mut(),
+                    &Geometry {
+                        x: 0,
+                        y: 0,
+                        width,
+                        height,
+                    },
+                    state,
+                );
+
+                let surface = state
+                    .bg_surface
+                    .wl_surface
+                    .as_ref()
+                    .expect("bg surface was not ready");
+                let viewport = state
+                    .bg_surface
+                    .viewport
+                    .as_ref()
+                    .expect("bg viewport was not ready");
+                viewport.set_destination(dim.0, dim.1);
+                surface.commit();
+            }
+            zwlr_layer_surface_v1::Event::Closed => {
+                std::process::exit(0);
+            }
+            _ => (),
+        }
+    }
+}
+
+impl Dispatch<xdg_wm_base::XdgWmBase, ()> for State {
+    fn event(
+        _: &mut Self,
+        wm_base: &xdg_wm_base::XdgWmBase,
+        event: xdg_wm_base::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<Self>,
+    ) {
+        if let xdg_wm_base::Event::Ping { serial } = event {
+            wm_base.pong(serial);
+        }
+    }
+}
+
+impl Dispatch<xdg_surface::XdgSurface, ()> for State {
+    fn event(
+        state: &mut Self,
+        xdg_surface: &xdg_surface::XdgSurface,
+        event: xdg_surface::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<Self>,
+    ) {
+        if let xdg_surface::Event::Configure { serial, .. } = event {
+            xdg_surface.ack_configure(serial);
+            state.configured = true;
+            state.dirty = true;
+        }
+    }
+}
+
+impl Dispatch<xdg_toplevel::XdgToplevel, ()> for State {
+    fn event(
+        state: &mut Self,
+        _: &xdg_toplevel::XdgToplevel,
+        event: xdg_toplevel::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<Self>,
+    ) {
+        match event {
+            xdg_toplevel::Event::Configure {
+                mut width,
+                mut height,
+                states,
+                ..
+            } => {
+                if (width, height) == (0, 0) {
+                    if state.configured {
+                        return;
+                    }
+                    (width, height) = (1280, 720);
+                }
+                let activated = states
+                    .iter()
+                    .find(|&st| *st as u32 == xdg_toplevel::State::Activated as u32)
+                    .is_some();
+
+                if activated {
+                    state.activated = true;
+                } else if state.activated && !activated {
+                    let ev = Event::FocusLost;
+                    for widget in state.widgets.iter_mut() {
+                        widget.event(&ev);
+                    }
+                }
+
+                if !state.configured || state.dimensions != (width, height) {
+                    let surface = state
+                        .bg_surface
+                        .wl_surface
+                        .as_ref()
+                        .expect("bg surface was not ready");
+                    let viewport = state
+                        .bg_surface
+                        .viewport
+                        .as_ref()
+                        .expect("bg viewportw as not ready");
+                    viewport.set_destination(width, height);
+                    surface.commit();
+
+                    state.bufmgr.clear_buffers();
+                    state.dimensions = (width, height);
+                    state.fonts.resolve();
+                    let fonts = state.fonts.unwrap();
+                    let layout = state.layout.clone();
+                    layout.geometry_update(
+                        &mut fonts.borrow_mut(),
+                        &Geometry {
+                            x: 0,
+                            y: 0,
+                            width: width as u32,
+                            height: height as u32,
+                        },
+                        state,
+                    );
+                }
+            }
+            xdg_toplevel::Event::Close => {
+                state.running = false;
+            }
+            _ => (),
+        }
+    }
+}
+
+impl Dispatch<wl_seat::WlSeat, ()> for State {
+    fn event(
+        _: &mut Self,
+        seat: &wl_seat::WlSeat,
+        event: wl_seat::Event,
+        _: &(),
+        _: &Connection,
+        qh: &QueueHandle<Self>,
+    ) {
+        if let wl_seat::Event::Capabilities {
+            capabilities: WEnum::Value(capabilities),
+        } = event
+        {
+            if capabilities.contains(wl_seat::Capability::Keyboard) {
+                seat.get_keyboard(qh, ());
+            }
+            if capabilities.contains(wl_seat::Capability::Pointer) {
+                seat.get_pointer(qh, ());
+            }
+        }
+    }
+}
+
+impl Dispatch<wl_keyboard::WlKeyboard, ()> for State {
+    fn event(
+        state: &mut Self,
+        _: &wl_keyboard::WlKeyboard,
+        event: wl_keyboard::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<Self>,
+    ) {
+        match event {
+            wl_keyboard::Event::Leave { .. } => {
+                state
+                    .keyrepeat_sender
+                    .send(RepeatMessage::StopRepeat)
+                    .unwrap();
+            }
+            wl_keyboard::Event::Key {
+                key,
+                state: kbstate,
+                ..
+            } => {
+                state.keyboard.resolve();
+                let k = state.keyboard.key(key, kbstate);
+                let repeats = k.repeats;
+                let ev = Event::KeyEvent(k);
+                // Widgets see the key first so the launcher gets to save its
+                // prompt on Escape (the early-return used to swallow it).
+                for widget in state.widgets.iter_mut() {
+                    widget.event(&ev);
+                }
+                // Raw keycode 1 is KEY_ESC: fall back to quitting even when no
+                // keymap could be loaded and no widget handled it.
+                if key == 1 && kbstate == WEnum::Value(wl_keyboard::KeyState::Pressed) {
+                    state.running = false;
+                    return;
+                }
+                if repeats && let Event::KeyEvent(k) = ev {
+                    state
+                        .keyrepeat_sender
+                        .send(RepeatMessage::KeyEvent(k))
+                        .unwrap();
+                }
+                state.dirty = true;
+            }
+            wl_keyboard::Event::Modifiers {
+                mods_depressed,
+                mods_latched,
+                mods_locked,
+                group,
+                ..
+            } => {
+                state
+                    .keyboard
+                    .modifiers(mods_depressed, mods_latched, mods_locked, group);
+            }
+            wl_keyboard::Event::Keymap { format, fd, size } => {
+                // TODO: Keymap loading blocks xdg configure, consider delaying
+                state.keyboard.keymap(format, fd, size);
+            }
+            wl_keyboard::Event::RepeatInfo { rate, delay } => {
+                state
+                    .keyrepeat_sender
+                    .send(RepeatMessage::RepeatInfo((rate as u32, delay as u32)))
+                    .unwrap();
+            }
+            _ => (),
+        }
+    }
+}
+
+// TODO: Move to dedicated pointer module
+const BTN_LEFT: u32 = 0x110;
+const BTN_RIGHT: u32 = 0x111;
+const BTN_MIDDLE: u32 = 0x112;
+
+impl Dispatch<wl_pointer::WlPointer, ()> for State {
+    fn event(
+        state: &mut Self,
+        _: &wl_pointer::WlPointer,
+        event: wl_pointer::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<Self>,
+    ) {
+        match event {
+            wl_pointer::Event::Enter {
+                surface_x,
+                surface_y,
+                ..
+            } => {
+                state.pointer = Some((surface_x, surface_y));
+            }
+            wl_pointer::Event::Motion {
+                surface_x,
+                surface_y,
+                ..
+            } => {
+                state.pointer = Some((surface_x, surface_y));
+            }
+            wl_pointer::Event::Leave { .. } => state.pointer = None,
+            wl_pointer::Event::Axis { axis, value, .. } => {
+                if let Some((x, y)) = state.pointer {
+                    let axis = match axis {
+                        WEnum::Value(wl_pointer::Axis::VerticalScroll) => {
+                            PointerButton::ScrollVertical(value)
+                        }
+                        WEnum::Value(wl_pointer::Axis::HorizontalScroll) => {
+                            PointerButton::ScrollHorizontal(value)
+                        }
+                        _ => return,
+                    };
+                    let pos = (x as u32, y as u32);
+                    for widget in state.widgets.iter_mut() {
+                        let geo = widget.geometry();
+                        if geo.contains(pos) {
+                            let pos = (pos.0 - geo.x, pos.1 - geo.y);
+                            let ev = Event::PointerEvent(PointerEvent { button: axis, pos });
+                            widget.event(&ev);
+                            state.dirty = true;
+                            break;
+                        }
+                    }
+                }
+            }
+            wl_pointer::Event::Button {
+                button,
+                state: button_state,
+                ..
+            } => {
+                if let (button, WEnum::Value(wl_pointer::ButtonState::Pressed), Some((x, y))) =
+                    (button, button_state, state.pointer)
+                {
+                    let button = match button {
+                        BTN_LEFT => PointerButton::Left,
+                        BTN_RIGHT => PointerButton::Right,
+                        BTN_MIDDLE => PointerButton::Middle,
+                        _ => return,
+                    };
+                    let pos = (x as u32, y as u32);
+                    for widget in state.widgets.iter_mut() {
+                        let geo = widget.geometry();
+                        if geo.contains(pos) {
+                            let pos = (pos.0 - geo.x, pos.1 - geo.y);
+                            let ev = Event::PointerEvent(PointerEvent { button, pos });
+                            widget.event(&ev);
+                            state.dirty = true;
+                            break;
+                        }
+                    }
+                }
+            }
+            _ => (),
+        }
+    }
+}
+
+impl Dispatch<wp_single_pixel_buffer_manager_v1::WpSinglePixelBufferManagerV1, ()> for State {
+    fn event(
+        _: &mut Self,
+        _: &wp_single_pixel_buffer_manager_v1::WpSinglePixelBufferManagerV1,
+        _: wp_single_pixel_buffer_manager_v1::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<Self>,
+    ) {
+    }
+}
+
+impl Dispatch<wp_viewporter::WpViewporter, ()> for State {
+    fn event(
+        _: &mut Self,
+        _: &wp_viewporter::WpViewporter,
+        _: wp_viewporter::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<Self>,
+    ) {
+    }
+}
+
+impl Dispatch<wp_viewport::WpViewport, ()> for State {
+    fn event(
+        _: &mut Self,
+        _: &wp_viewport::WpViewport,
+        _: wp_viewport::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<Self>,
+    ) {
+    }
+}
+
+impl Dispatch<xdg_activation_v1::XdgActivationV1, ()> for State {
+    fn event(
+        _: &mut Self,
+        _: &xdg_activation_v1::XdgActivationV1,
+        _: xdg_activation_v1::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<Self>,
+    ) {
+    }
+}
+
+impl Dispatch<xdg_activation_token_v1::XdgActivationTokenV1, ()> for State {
+    fn event(
+        state: &mut Self,
+        _: &xdg_activation_token_v1::XdgActivationTokenV1,
+        event: xdg_activation_token_v1::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<Self>,
+    ) {
+        if let xdg_activation_token_v1::Event::Done { token } = event {
+            let ev = Event::TokenUpdate(token);
+            for widget in state.widgets.iter_mut() {
+                widget.event(&ev);
+            }
+        }
+    }
+}

src/utils/desktop.rs

@@ -0,0 +1,125 @@
+use std::{
+    cmp::Ordering,
+    collections::HashSet,
+    error::Error,
+    fs::read_to_string,
+    hash::{Hash, Hasher},
+    io::{Error as io_error, ErrorKind},
+    path::Path,
+};
+
+use walkdir::WalkDir;
+
+use crate::utils::{inish, xdg};
+
+#[derive(Clone, Debug, Eq)]
+pub struct Desktop {
+    pub entry_type: String,
+    pub name: String,
+    pub no_display: bool,
+    pub hidden: bool,
+    pub exec: Option<String>,
+    pub url: Option<String>,
+    pub term: bool,
+    pub keywords: Vec<String>,
+}
+
+impl Desktop {
+    fn parse(f: &Path) -> Result<Desktop, Box<dyn Error>> {
+        let s = read_to_string(f)?;
+        let config = inish::parse(&s)?;
+        match config.get("Desktop Entry") {
+            Some(section) => Ok(Desktop {
+                entry_type: section.get("Type").unwrap_or(&"").to_string(),
+                name: section.get("Name").unwrap_or(&"").to_string(),
+                term: section.get("Terminal").unwrap_or(&"") == &"true",
+                no_display: section.get("NoDisplay").unwrap_or(&"") == &"true",
+                hidden: section.get("Hidden").unwrap_or(&"") == &"true",
+                exec: section.get("Exec").map(|x| x.to_string()),
+                url: section.get("URL").map(|x| x.to_string()),
+                keywords: section
+                    .get("Keywords")
+                    .map(|x| {
+                        x.split(';')
+                            .map(|y| y.trim().to_string())
+                            .filter(|z| !z.is_empty())
+                            .collect()
+                    })
+                    .unwrap_or_else(std::vec::Vec::new),
+            }),
+            None => Err(Box::new(io_error::new(
+                ErrorKind::NotFound,
+                "no desktop entry in file",
+            ))),
+        }
+    }
+}
+
+impl Ord for Desktop {
+    fn cmp(&self, other: &Self) -> Ordering {
+        self.name.cmp(&other.name)
+    }
+}
+
+impl PartialOrd for Desktop {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+impl PartialEq for Desktop {
+    fn eq(&self, other: &Self) -> bool {
+        self.name == other.name
+    }
+}
+
+// Must agree with PartialEq: equal entries (same name) must hash equally.
+impl Hash for Desktop {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.name.hash(state)
+    }
+}
+
+/// Scan every XDG applications directory for launchable entries.
+///
+/// This used to be cached as JSON under XDG_CACHE_HOME and refreshed by
+/// hand with `--desktop-refresh`. The scan is a few milliseconds over
+/// local /usr/share and runs on a background thread, while the cache sat
+/// on the (possibly NFS-mounted) home directory and went stale whenever a
+/// package was installed. So: no cache.
+pub fn load_desktop_files() -> Vec<Desktop> {
+    let dirs = xdg::data_folders();
+
+    let mut desktop: Vec<Desktop> = Vec::new();
+    let mut seen: HashSet<String> = HashSet::new();
+
+    for dir in dirs {
+        for entry in WalkDir::new(format!("{}/applications", dir))
+            .into_iter()
+            .flatten()
+        {
+            // Entries are often symlinks, so only rule out directories.
+            if entry.file_type().is_dir()
+                || entry.path().extension().and_then(|e| e.to_str()) != Some("desktop")
+            {
+                continue;
+            }
+            {
+                if let Ok(d) = Desktop::parse(entry.path()) {
+                    if d.hidden
+                        || d.no_display
+                        || (d.entry_type != "Application" && d.entry_type != "Link")
+                    {
+                        continue;
+                    }
+                    if !seen.contains(&d.name) {
+                        seen.insert(d.name.to_string());
+                        desktop.push(d);
+                    }
+                }
+            }
+        }
+    }
+
+    desktop
+}

src/utils/inish.rs

@@ -0,0 +1,134 @@
+use std::{collections::HashMap, error::Error};
+
+fn parse_field(line: &str) -> Result<(&str, &str), Box<dyn Error>> {
+    let split = match line.find('=') {
+        Some(v) => v,
+        None => return Err("expected equals sign on line, but found none".into()),
+    };
+
+    let (key, value) = line.split_at(split);
+    let (key, value) = (key.trim(), value.trim_matches('=').trim());
+
+    Ok((key, value))
+}
+
+type InishSection<'a> = HashMap<&'a str, &'a str>;
+type Inish<'a> = HashMap<&'a str, InishSection<'a>>;
+
+pub fn parse<'a>(s: &'a str) -> Result<Inish<'a>, Box<dyn Error>> {
+    let mut sections: Inish<'a> = HashMap::new();
+    let mut current_section = HashMap::new();
+    let mut current_section_name = "";
+
+    for line in s.lines() {
+        let line = line.trim();
+        let mut chars = line.chars();
+        let start = chars.next();
+        let end = chars.last();
+        match (start, end) {
+            (Some('#'), _) => continue,
+            (Some('['), Some(']')) => {
+                sections.insert(current_section_name, current_section);
+                current_section = HashMap::new();
+                let len = line.len();
+                current_section_name = line[1..len - 1].trim();
+            }
+            (Some('['), v) => {
+                return Err(format!(
+                    "expected Some(']') to terminate section name, but got {:?}",
+                    v
+                )
+                .into());
+            }
+            _ if line.is_empty() => continue,
+            _ => {
+                let (key, value) = parse_field(line)?;
+                current_section.insert(key, value);
+            }
+        }
+    }
+
+    sections.insert(current_section_name, current_section);
+    Ok(sections)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn sections() {
+        let config = parse(
+            "
+[section_a]
+[section_b]
+",
+        )
+        .expect("config didn't parse");
+
+        if !config.contains_key("section_a") {
+            panic!("named section did not exist");
+        }
+
+        if !config.contains_key("section_b") {
+            panic!("named section did not exist");
+        }
+
+        if !config.contains_key("") {
+            panic!("unnamed section did not exist");
+        }
+    }
+
+    #[test]
+    fn fields() {
+        let config = parse(
+            "
+field_outside = 'hello'
+[section_a]
+field_a = 1234
+",
+        )
+        .expect("config didn't parse");
+
+        let section_a = match config.get("section_a") {
+            Some(v) => v,
+            None => panic!("named section did not exist"),
+        };
+
+        assert_eq!(section_a.get("field_a"), Some(&"1234"));
+
+        let section_unnamed = match config.get("") {
+            Some(v) => v,
+            None => panic!("unnamed section did not exist"),
+        };
+
+        assert_eq!(section_unnamed.get("field_outside"), Some(&"'hello'"));
+    }
+
+    #[test]
+    fn whitespaces() {
+        let config = parse(
+            "
+
+ field outside  =   'hello'
+
+[ section a   ]
+   field a   =   1234   ",
+        )
+        .expect("config didn't parse");
+
+        let section_a = match config.get("section a") {
+            Some(v) => v,
+            None => panic!("named section did not exist"),
+        };
+
+        assert_eq!(section_a.get("field a"), Some(&"1234"));
+
+        let section_unnamed = match config.get("") {
+            Some(v) => v,
+            None => panic!("unnamed section did not exist"),
+        };
+
+        assert_eq!(section_unnamed.get("field outside"), Some(&"'hello'"));
+    }
+}

src/utils/mod.rs

@@ -0,0 +1,3 @@
+pub mod desktop;
+mod inish;
+pub mod xdg;

src/utils/xdg.rs

@@ -0,0 +1,52 @@
+use std::env;
+
+pub fn cache_folder() -> String {
+    match env::var_os("XDG_CACHE_HOME") {
+        Some(s) => s.into_string().unwrap(),
+        None => {
+            let home = env::var_os("HOME").unwrap().into_string().unwrap();
+            format!("{}/.cache", home)
+        }
+    }
+}
+
+/// XDG_STATE_HOME: small persistent state (calculator history, saved
+/// prompt). Unlike a cache this is worth roaming with the home directory.
+pub fn state_folder() -> String {
+    match env::var_os("XDG_STATE_HOME") {
+        Some(s) => s.into_string().unwrap(),
+        None => {
+            let home = env::var_os("HOME").unwrap().into_string().unwrap();
+            format!("{}/.local/state", home)
+        }
+    }
+}
+
+pub fn config_folder() -> String {
+    match env::var_os("XDG_CONFIG_HOME") {
+        Some(s) => s.into_string().unwrap(),
+        None => {
+            let home = env::var_os("HOME").unwrap().into_string().unwrap();
+            format!("{}/.config", home)
+        }
+    }
+}
+
+pub fn data_folders() -> Vec<String> {
+    let xdg_data_home = match env::var_os("XDG_DATA_HOME") {
+        Some(s) => s.into_string().unwrap(),
+        None => {
+            let home = env::var_os("HOME").unwrap().into_string().unwrap();
+            format!("{}/.local/share", home)
+        }
+    };
+    let xdg_data_dirs = match env::var_os("XDG_DATA_DIRS") {
+        Some(s) => s.into_string().unwrap(),
+        None => "/usr/local/share:/usr/share".to_string(),
+    };
+
+    // Eww.
+    std::iter::once(xdg_data_home.to_string())
+        .chain(xdg_data_dirs.split(':').map(|x| x.to_string()))
+        .collect()
+}

src/widgets/alsaaudio.rs

@@ -0,0 +1,112 @@
+use std::{
+    thread,
+    sync::{Arc, Mutex},
+};
+
+use crate::{
+    color::Color,
+    fonts::FontMap,
+    event::{Event, Events, PointerButton},
+    widgets::bar_widget::{BarWidget, BarWidgetImpl},
+};
+
+use alsa::mixer::{
+    Mixer, Selem, SelemChannelId, SelemId,
+};
+
+#[inline]
+fn alsa_volume_to_f32(volume: i64, min: i64, max: i64) -> f32 {
+    (volume - min) as f32 / (max - min) as f32
+}
+
+#[inline]
+fn f32_to_alsa_volume(volume: f32, min: i64, max: i64) -> i64 {
+    min + ((max - min) as f32 * volume) as i64
+}
+
+fn get_master_volume(selem: &mut Selem) -> f32 {
+    let (min, max) = selem.get_playback_volume_range();
+    selem
+        .get_playback_volume(SelemChannelId::mono())
+        .map(|volume| alsa_volume_to_f32(volume, min, max))
+        .unwrap()
+}
+
+fn get_mute(selem: &mut Selem) -> bool {
+    let res = selem.get_playback_switch(SelemChannelId::FrontLeft);
+    false
+}
+
+fn set_master_volume(selem: &mut Selem, volume: f32) {
+    let (min, max) = selem.get_playback_volume_range();
+    let volume = f32_to_alsa_volume(volume, min, max);
+    selem.set_playback_volume_all(volume).unwrap();
+}
+
+fn start_monitor(inner: Arc<Mutex<Inner>>) {
+    thread::Builder::new()
+        .name("audiomon".to_string())
+        .spawn(move || {
+            let mixer = Mixer::new("default", true).unwrap();
+            let id = SelemId::new("Master", 0);
+            let mut selem = mixer.find_selem(&id).unwrap();
+
+            let mut inner = inner.lock().unwrap();
+            inner.volume = get_master_volume(&mut selem);
+            inner.mute = get_mute(&mut selem);
+        })
+        .unwrap();
+}
+
+struct Inner {
+    volume: f32,
+    mute: bool,
+}
+
+pub struct AlsaAudio {
+    inner: Arc<Mutex<Inner>>,
+}
+
+impl AlsaAudio {
+    pub fn new(fm: &mut FontMap, font: &'static str, size: f32) -> BarWidget {
+        let inner = Arc::new(Mutex::new(Inner{
+            mute: false,
+            volume: 0.,
+        }));
+        start_monitor(inner.clone());
+        let dev = AlsaAudio{ inner };
+        BarWidget::new(Box::new(dev), fm, font, size)
+    }
+}
+
+impl BarWidgetImpl for AlsaAudio {
+    fn name(&self) -> &'static str {
+        "audio"
+    }
+    fn get_dirty(&self) -> bool {
+        true
+    }
+    fn value(&mut self) -> f32 {
+        let inner = self.inner.lock().unwrap();
+        inner.volume
+    }
+    fn color(&self) -> Color {
+        let inner = self.inner.lock().unwrap();
+        if inner.mute {
+            Color::DARKORANGE
+        } else {
+            Color::WHITE
+        }
+    }
+    fn click(&mut self, pos: f32, btn: PointerButton) {
+        let inner = self.inner.lock().unwrap();
+        match btn {
+//            PointerButton::Left =>  inner.set_master_volume(pos),
+            //PointerButton::Right => Some(Change::ToggleMute),
+            //PointerButton::ScrollVertical(val) => Some(Change::VolumeInc((val / 512.) as f32)),
+            //PointerButton::ScrollHorizontal(val) => Some(Change::VolumeInc((val / 100.) as f32)),
+            _ => (),
+        };
+    }
+
+}

src/widgets/backlight.rs

@@ -0,0 +1,113 @@
+use std::{
+    fs::{self, OpenOptions},
+    io::{Error, Write},
+    path::{Path, PathBuf},
+};
+
+use walkdir::WalkDir;
+
+use crate::{
+    color::Color,
+    event::PointerButton,
+    fonts::FontMap,
+    widgets::bar_widget::{BarWidget, BarWidgetImpl},
+};
+
+fn read_file_as_u64(path: &Path) -> Result<u64, Error> {
+    let mut s = fs::read_to_string(path)?;
+    s.pop();
+    s.parse::<u64>()
+        .map_err(|_e| Error::other("unable to parse value"))
+}
+
+fn write_file_as_u64(path: &Path, value: u64) -> Result<(), Error> {
+    let mut file = OpenOptions::new().write(true).open(path)?;
+    file.write_fmt(format_args!("{}", value))
+}
+
+pub struct Backlight {
+    device_path: PathBuf,
+    cur: u64,
+    max: u64,
+    dirty: bool,
+}
+
+/// First device under /sys/class/backlight, if any. `min_depth(1)` skips the
+/// class directory itself, which otherwise got picked up as a "device".
+fn find_device() -> Option<PathBuf> {
+    WalkDir::new("/sys/class/backlight")
+        .min_depth(1)
+        .max_depth(1)
+        .into_iter()
+        .flatten()
+        .map(|e| e.path().to_path_buf())
+        .next()
+}
+
+impl Backlight {
+    fn update(&mut self) {
+        if let Ok(cur) = read_file_as_u64(self.device_path.join("brightness").as_path()) {
+            self.cur = cur;
+        }
+        if let Ok(max) = read_file_as_u64(self.device_path.join("max_brightness").as_path()) {
+            self.max = max;
+        }
+    }
+
+    // Wraps the impl in the generic BarWidget on purpose.
+    #[allow(clippy::new_ret_no_self)]
+    pub fn new(path: Option<&str>, fm: &mut FontMap, font: &'static str, size: f32) -> BarWidget {
+        let device_path = match path {
+            Some(path) => Some(Path::new("/sys/class/backlight").join(path)),
+            None => find_device(),
+        };
+        let mut dev = Backlight {
+            device_path: device_path.expect("did not find backlight device"),
+            cur: 0,
+            max: 0,
+            dirty: true,
+        };
+
+        dev.update();
+        BarWidget::new(Box::new(dev), fm, font, size)
+    }
+
+    pub fn detect() -> bool {
+        find_device().is_some()
+    }
+
+    pub fn set(&mut self, brightness: f32) {
+        let val = (self.max as f32 * brightness.clamp(0.0, 1.0)) as u64;
+        let _ = write_file_as_u64(self.device_path.join("brightness").as_path(), val);
+        if let Ok(cur) = read_file_as_u64(self.device_path.join("brightness").as_path()) {
+            self.cur = cur;
+        }
+    }
+}
+
+impl BarWidgetImpl for Backlight {
+    fn name(&self) -> &'static str {
+        "backlight"
+    }
+    fn get_dirty(&self) -> bool {
+        self.dirty
+    }
+    fn value(&mut self) -> f32 {
+        if self.max == 0 || self.cur > self.max {
+            // what.
+            return 1.0;
+        }
+
+        self.dirty = false;
+        self.cur as f32 / self.max as f32
+    }
+    fn color(&self) -> Color {
+        Color::WHITE
+    }
+    fn click(&mut self, pos: f32, btn: PointerButton) {
+        self.dirty = true;
+        if let PointerButton::Left = btn {
+            self.set(pos)
+        };
+    }
+}

src/widgets/bar_widget.rs

@@ -0,0 +1,108 @@
+use std::{cmp::min, default::Default};
+
+use crate::{
+    buffer::BufferView,
+    color::Color,
+    draw::{draw_bar, draw_box},
+    event::{Event, PointerButton},
+    fonts::FontMap,
+    widgets::{Geometry, Widget},
+};
+
+pub trait BarWidgetImpl {
+    fn get_dirty(&self) -> bool {
+        false
+    }
+    fn name(&self) -> &'static str;
+    fn value(&mut self) -> f32;
+    fn color(&self) -> Color;
+    fn click(&mut self, _pos: f32, _btn: PointerButton) {}
+}
+
+pub struct BarWidget {
+    font: &'static str,
+    size: f32,
+    geometry: Geometry,
+    inner_widget: Box<dyn BarWidgetImpl>,
+}
+
+impl BarWidget {
+    pub fn new(
+        inner_widget: Box<dyn BarWidgetImpl>,
+        fm: &mut FontMap,
+        font: &'static str,
+        size: f32,
+    ) -> BarWidget {
+        fm.queue_font(font, size, inner_widget.name());
+        BarWidget {
+            geometry: Default::default(),
+            inner_widget,
+            font,
+            size,
+        }
+    }
+}
+
+impl Widget for BarWidget {
+    fn geometry(&self) -> Geometry {
+        self.geometry
+    }
+
+    fn get_dirty(&self) -> bool {
+        self.inner_widget.get_dirty()
+    }
+
+    fn draw(&mut self, fonts: &mut FontMap, view: &mut BufferView) -> Geometry {
+        let font = fonts.get_font(self.font, self.size);
+        let fg = Color::WHITE;
+
+        font.draw_text(view, fg, self.inner_widget.name()).unwrap();
+        let size = self.size.ceil() as u32;
+        let bar_offset = 4 * size;
+        let val = self.inner_widget.value();
+
+        let c = self.inner_widget.color();
+        let bar_width = self.geometry.width.saturating_sub(bar_offset);
+        if bar_width < 2 {
+            return self.geometry;
+        }
+        draw_bar(&mut view.offset((bar_offset, 0)), c, bar_width, size, val).unwrap();
+
+        draw_box(&mut view.offset((bar_offset, 0)), c, (bar_width, size)).unwrap();
+        self.geometry
+    }
+
+    fn geometry_update(&mut self, _fonts: &mut FontMap, geometry: &Geometry) -> Geometry {
+        let w = min(geometry.width, 768);
+        let mut x = geometry.x;
+        if geometry.width > w {
+            x += geometry.width - w;
+        }
+        self.geometry = Geometry {
+            x,
+            y: geometry.y,
+            width: w,
+            height: self.size.ceil() as u32,
+        };
+        self.geometry
+    }
+
+    fn minimum_size(&mut self, _fonts: &mut FontMap) -> Geometry {
+        Geometry {
+            x: 0,
+            y: 0,
+            width: self.size.ceil() as u32 * 6,
+            height: self.size.ceil() as u32,
+        }
+    }
+
+    fn event(&mut self, event: &Event) {
+        if let Event::PointerEvent(ev) = event {
+            let offset = 4 * self.size.ceil() as u32;
+            if ev.pos.0 >= offset && self.geometry.width > offset {
+                let val = (ev.pos.0 - offset) as f32 / (self.geometry.width - offset) as f32;
+                self.inner_widget.click(val, ev.button);
+            }
+        }
+    }
+}

src/widgets/battery.rs

@@ -0,0 +1,186 @@
+use std::{
+    error::Error,
+    sync::{Arc, Mutex},
+    thread,
+    time::Duration,
+};
+
+use dbus::blocking::{
+    LocalConnection,
+    stdintf::org_freedesktop_dbus::{Properties, PropertiesPropertiesChanged},
+};
+
+use crate::{
+    color::Color,
+    event::{Event, Events},
+    fonts::FontMap,
+    widgets::bar_widget::{BarWidget, BarWidgetImpl},
+};
+
+enum UpowerBatteryState {
+    Unknown,
+    Charging,
+    Discharging,
+    Empty,
+    FullyCharged,
+    PendingCharge,
+    PendingDischarge,
+}
+
+impl UpowerBatteryState {
+    fn from_dbus(val: u64) -> UpowerBatteryState {
+        match val {
+            1 => UpowerBatteryState::Charging,
+            2 => UpowerBatteryState::Discharging,
+            3 => UpowerBatteryState::Empty,
+            4 => UpowerBatteryState::FullyCharged,
+            5 => UpowerBatteryState::PendingCharge,
+            6 => UpowerBatteryState::PendingDischarge,
+            _ => UpowerBatteryState::Unknown,
+        }
+    }
+}
+
+struct InnerBattery {
+    value: f32,
+    state: UpowerBatteryState,
+    dirty: bool,
+}
+
+const DEVICE_PATH: &str = "/org/freedesktop/UPower/devices/DisplayDevice";
+const DEVICE_IFACE: &str = "org.freedesktop.UPower.Device";
+
+/// True if UPower reports a present battery. The DisplayDevice object exists
+/// even on machines without a battery, so checking for mere reachability
+/// (as before) made every desktop grow a battery widget.
+fn battery_present() -> Result<bool, Box<dyn Error>> {
+    let conn = LocalConnection::new_system()?;
+    let proxy = conn.with_proxy(
+        "org.freedesktop.UPower",
+        DEVICE_PATH,
+        Duration::from_millis(500),
+    );
+    let present: bool = proxy.get(DEVICE_IFACE, "IsPresent")?;
+    Ok(present)
+}
+
+fn monitor(
+    inner: Arc<Mutex<InnerBattery>>,
+    events: Arc<Mutex<Events>>,
+) -> Result<(), Box<dyn Error>> {
+    let conn = LocalConnection::new_system()?;
+    let proxy = conn.with_proxy(
+        "org.freedesktop.UPower",
+        DEVICE_PATH,
+        Duration::from_millis(500),
+    );
+
+    let capacity: f64 = proxy.get(DEVICE_IFACE, "Percentage")?;
+    let state: u32 = proxy.get(DEVICE_IFACE, "State")?;
+
+    {
+        let mut inner = inner.lock().unwrap();
+        inner.value = capacity as f32 / 100.;
+        inner.state = UpowerBatteryState::from_dbus(state as u64);
+        inner.dirty = true;
+    }
+    events.lock().unwrap().add_event(Event::PowerUpdate);
+
+    proxy.match_signal(
+        move |c: PropertiesPropertiesChanged, _: &LocalConnection, _: &dbus::Message| {
+            if c.interface_name != DEVICE_IFACE {
+                return true;
+            }
+            let mut inner = inner.lock().unwrap();
+            for (key, value) in c.changed_properties {
+                match key.as_str() {
+                    "State" => {
+                        if let Some(v) = value.0.as_u64() {
+                            inner.state = UpowerBatteryState::from_dbus(v);
+                            inner.dirty = true;
+                            events.lock().unwrap().add_event(Event::PowerUpdate);
+                        }
+                    }
+                    "Percentage" => {
+                        if let Some(v) = value.0.as_f64() {
+                            inner.value = v as f32 / 100.;
+                            inner.dirty = true;
+                            events.lock().unwrap().add_event(Event::PowerUpdate);
+                        }
+                    }
+                    _ => (),
+                }
+            }
+            true
+        },
+    )?;
+
+    loop {
+        conn.process(Duration::from_millis(60000))?;
+    }
+}
+
+fn start_monitor(inner: Arc<Mutex<InnerBattery>>, events: Arc<Mutex<Events>>) {
+    thread::Builder::new()
+        .name("battmon".to_string())
+        .spawn(move || {
+            // The release profile uses panic = "abort": a panic here would take
+            // the whole dashboard down, so report and leave the bar at 0.
+            if let Err(e) = monitor(inner, events) {
+                eprintln!("wldash: battery monitor stopped: {}", e);
+            }
+        })
+        .unwrap();
+}
+
+pub struct Battery {
+    inner: Arc<Mutex<InnerBattery>>,
+}
+
+impl Battery {
+    // Wraps the impl in the generic BarWidget on purpose.
+    #[allow(clippy::new_ret_no_self)]
+    pub fn new(
+        events: Arc<Mutex<Events>>,
+        fm: &mut FontMap,
+        font: &'static str,
+        size: f32,
+    ) -> BarWidget {
+        let battery = Battery {
+            inner: Arc::new(Mutex::new(InnerBattery {
+                value: 0.,
+                state: UpowerBatteryState::Unknown,
+                dirty: false,
+            })),
+        };
+        start_monitor(battery.inner.clone(), events);
+        BarWidget::new(Box::new(battery), fm, font, size)
+    }
+
+    pub fn detect() -> bool {
+        battery_present().unwrap_or(false)
+    }
+}
+
+impl BarWidgetImpl for Battery {
+    fn get_dirty(&self) -> bool {
+        self.inner.lock().unwrap().dirty
+    }
+    fn name(&self) -> &'static str {
+        "battery"
+    }
+    fn value(&mut self) -> f32 {
+        let mut inner = self.inner.lock().unwrap();
+        inner.dirty = false;
+        inner.value
+    }
+    fn color(&self) -> Color {
+        let inner = self.inner.lock().unwrap();
+        match inner.state {
+            UpowerBatteryState::Charging | UpowerBatteryState::FullyCharged => Color::LIGHTGREEN,
+            _ if inner.value > 0.25 => Color::WHITE,
+            _ if inner.value > 0.1 => Color::DARKORANGE,
+            _ => Color::RED,
+        }
+    }
+}

src/widgets/calendar.rs

@@ -0,0 +1,345 @@
+use std::default::Default;
+
+use crate::{
+    buffer::BufferView,
+    color::Color,
+    event::Event,
+    fonts::FontMap,
+    widgets::{Geometry, Widget},
+};
+
+use chrono::{Datelike, Local, NaiveDate};
+
+pub struct Calendar {
+    font: &'static str,
+    month_font: &'static str,
+    sections_x: i32,
+    sections_y: i32,
+    shown_sections_x: u32,
+    shown_sections_y: u32,
+    size: f32,
+    dirty: bool,
+    geometry: Geometry,
+    year_width: u32,
+    date_width: u32,
+    day_width: u32,
+}
+
+const DAY_FACTOR: f32 = 0.6;
+const YEAR_FACTOR: f32 = 0.75;
+const MONTH_FACTOR: f32 = 1.25;
+const DATE_FACTOR: f32 = 1.;
+
+const LINE_HEIGHT: f32 = 0.85;
+
+impl Calendar {
+    pub fn new(
+        fm: &mut FontMap,
+        font: &'static str,
+        month_font: &'static str,
+        size: f32,
+        sections_x: i32,
+        sections_y: i32,
+    ) -> Calendar {
+        fm.queue_font(font, size * DAY_FACTOR, "ADEFHIMNORSTUW");
+        fm.queue_font(font, size * YEAR_FACTOR, "0123456789");
+        fm.queue_font(font, size * DATE_FACTOR, "0123456789");
+        fm.queue_font(
+            month_font,
+            size * MONTH_FACTOR,
+            "ADFJMNOSabcehgilmnoprstuvy",
+        );
+
+        Calendar {
+            font,
+            month_font,
+            size,
+            sections_x,
+            sections_y,
+            shown_sections_x: 0,
+            shown_sections_y: 0,
+            dirty: true,
+            geometry: Default::default(),
+            date_width: 0,
+            day_width: 0,
+            year_width: 0,
+        }
+    }
+
+    fn draw_month(
+        &mut self,
+        fonts: &mut FontMap,
+        view: &mut BufferView,
+        orig: NaiveDate,
+        mut time: NaiveDate,
+    ) {
+        let cal_width = 8 * self.date_width + 7 * (self.date_width / 2);
+        //
+        // Draw the week day
+        //
+        let day_offset = (self.date_width - self.day_width) / 2;
+        let date_offset = self.date_width + self.date_width / 2;
+        for idx in 1..8 {
+            let day_font = fonts.get_font(self.font, self.size * DAY_FACTOR);
+            let (wk_chr, c) = match idx {
+                1 => ("MON", Color::WHITE),
+                2 => ("TUE", Color::WHITE),
+                3 => ("WED", Color::WHITE),
+                4 => ("THU", Color::WHITE),
+                5 => ("FRI", Color::WHITE),
+                6 => ("SAT", Color::GREY80),
+                7 => ("SUN", Color::GREY80),
+                _ => panic!("impossible value"),
+            };
+
+            day_font
+                .draw_text(
+                    &mut view.offset((
+                        idx * date_offset + day_offset,
+                        (self.size * MONTH_FACTOR).ceil() as u32
+                            + (self.size * DAY_FACTOR * 0.2).ceil() as u32,
+                    )),
+                    c,
+                    wk_chr,
+                )
+                .unwrap();
+        }
+
+        //
+        // Draw the month
+        //
+        let month_font = fonts.get_font(self.month_font, self.size * MONTH_FACTOR);
+        let month_str = match time.month() {
+            1 => "January",
+            2 => "February",
+            3 => "March",
+            4 => "April",
+            5 => "May",
+            6 => "June",
+            7 => "July",
+            8 => "August",
+            9 => "September",
+            10 => "October",
+            11 => "November",
+            12 => "December",
+            _ => panic!("impossible value"),
+        };
+        month_font.draw_text(view, Color::WHITE, month_str).unwrap();
+
+        //
+        // Draw the year
+        //
+        if time.year() != orig.year() {
+            let year_font = fonts.get_font(self.font, self.size * YEAR_FACTOR);
+            year_font
+                .draw_text(
+                    &mut view.offset((cal_width - self.year_width, 0)),
+                    Color::GREY80,
+                    &format!("{:}", time.year()),
+                )
+                .unwrap();
+        }
+
+        let cal_font = fonts.get_font(self.font, self.size * DATE_FACTOR);
+        'row: for y_off in 1.. {
+            //
+            // Draw the week number
+            //
+            let wk = time.iso_week();
+            cal_font
+                .draw_text(
+                    &mut view.offset((
+                        0,
+                        y_off * (self.size * LINE_HEIGHT).ceil() as u32
+                            + (self.size * MONTH_FACTOR).ceil() as u32,
+                    )),
+                    if wk == orig.iso_week() {
+                        Color::WHITE
+                    } else {
+                        Color::GREY75
+                    },
+                    &format!("{:02}", wk.week()),
+                )
+                .unwrap();
+
+            //
+            // Draw the dates
+            //
+            let x_off = time.weekday().number_from_monday();
+            for x_pos in x_off..8 {
+                let c = if time.day() == orig.day() && time.month() == orig.month() {
+                    Color::WHITE
+                } else if x_pos < 6 {
+                    Color::GREY50
+                } else {
+                    Color::GREY35
+                };
+
+                cal_font
+                    .draw_text(
+                        &mut view.offset((
+                            x_pos * date_offset,
+                            y_off * (self.size * LINE_HEIGHT).ceil() as u32
+                                + (self.size * MONTH_FACTOR).ceil() as u32,
+                        )),
+                        c,
+                        &format!("{:02}", time.day()),
+                    )
+                    .unwrap();
+
+                let t = time.with_day(time.day() + 1);
+                if t.is_none() {
+                    break 'row;
+                }
+                time = t.unwrap();
+            }
+        }
+    }
+}
+
+impl Widget for Calendar {
+    fn get_dirty(&self) -> bool {
+        self.dirty
+    }
+
+    fn geometry(&self) -> Geometry {
+        self.geometry
+    }
+
+    fn event(&mut self, event: &Event) {
+        if let Event::NewMinute = event {
+            self.dirty = true;
+        }
+    }
+
+    fn draw(&mut self, fonts: &mut FontMap, view: &mut BufferView) -> Geometry {
+        if self.shown_sections_y == 0 || self.shown_sections_x == 0 {
+            return Geometry {
+                x: self.geometry.x,
+                y: self.geometry.y,
+                width: 0,
+                height: 0,
+            };
+        }
+
+        let time = Local::now().naive_local().date();
+
+        let cal_height =
+            (self.size * MONTH_FACTOR).ceil() as u32 + (self.size * LINE_HEIGHT * 8.).ceil() as u32;
+        let cal_width = 8 * self.date_width + 7 * (self.date_width / 2);
+        let cal_pad = self.date_width * 2;
+
+        let mut t = time.with_day(1).unwrap();
+        let cals = self.shown_sections_y * self.shown_sections_x;
+        if cals >= 3 {
+            t = t.pred_opt().unwrap().with_day(1).unwrap();
+        }
+
+        for ydx in 0..self.shown_sections_y {
+            for idx in 0..self.shown_sections_x {
+                self.draw_month(
+                    fonts,
+                    &mut view.offset(((cal_width + cal_pad) * idx, cal_height * ydx)),
+                    time,
+                    t,
+                );
+                t = if t.month() == 12 {
+                    t.with_year(t.year() + 1).unwrap().with_month(1).unwrap()
+                } else {
+                    t.with_month(t.month() + 1).unwrap()
+                };
+            }
+        }
+        self.dirty = false;
+        self.geometry
+    }
+
+    fn geometry_update(&mut self, fonts: &mut FontMap, geometry: &Geometry) -> Geometry {
+        let year_font = fonts.get_font(self.font, self.size * YEAR_FACTOR);
+        self.year_width = year_font.auto_widest("0123456789").unwrap() * 4;
+        let cal_font = fonts.get_font(self.font, self.size * DATE_FACTOR);
+        self.date_width = cal_font.auto_widest("0123456789").unwrap() * 2;
+        let day_font = fonts.get_font(self.font, self.size * DAY_FACTOR);
+        self.day_width = day_font.auto_widest("ADEFHIMNORSTUW").unwrap() * 3;
+
+        let cal_width = 8 * self.date_width + 7 * (self.date_width / 2);
+        let cal_height =
+            (self.size * MONTH_FACTOR).ceil() as u32 + (self.size * LINE_HEIGHT * 8.).ceil() as u32;
+
+        let cal_pad = self.date_width * 2;
+
+        if geometry.width < cal_width || geometry.height < cal_height {
+            self.shown_sections_x = 0;
+            self.shown_sections_y = 0;
+            self.geometry = Default::default();
+            return self.geometry;
+        }
+
+        let possible_sections_x = 1 + (geometry.width - cal_width) / (cal_width + cal_pad);
+        let possible_sections_y = 1 + (geometry.height - cal_height) / cal_height;
+
+        self.shown_sections_x =
+            if self.sections_x > 0 && self.sections_x < possible_sections_x as i32 {
+                self.sections_x as u32
+            } else {
+                possible_sections_x
+            };
+        self.shown_sections_y =
+            if self.sections_y > 0 && self.sections_y < possible_sections_y as i32 {
+                self.sections_y as u32
+            } else {
+                possible_sections_y
+            };
+
+        self.geometry = Geometry {
+            x: geometry.x,
+            y: geometry.y,
+            width: cal_width * self.shown_sections_x + cal_pad * (self.shown_sections_x - 1),
+            height: cal_height * self.shown_sections_y,
+        };
+        self.geometry
+    }
+
+    fn minimum_size(&mut self, fonts: &mut FontMap) -> Geometry {
+        let cal_font = fonts.get_font(self.font, self.size * DATE_FACTOR);
+        let date_width = cal_font.auto_widest("0123456789").unwrap() * 2;
+
+        let cal_width = 8 * date_width + 7 * (date_width / 2);
+        let cal_height =
+            (self.size * MONTH_FACTOR).ceil() as u32 + (self.size * LINE_HEIGHT * 8.).ceil() as u32;
+        let cal_pad = date_width * 2;
+
+        let sections_x = match self.sections_x {
+            -1 => 1,
+            0 => {
+                return Geometry {
+                    x: 0,
+                    y: 0,
+                    width: 0,
+                    height: 0,
+                };
+            }
+            x => x,
+        };
+        let sections_y = match self.sections_y {
+            -1 => 1,
+            0 => {
+                return Geometry {
+                    x: 0,
+                    y: 0,
+                    width: 0,
+                    height: 0,
+                };
+            }
+            y => y,
+        };
+        let width = cal_width * sections_x as u32 + cal_pad * (sections_x as u32 - 1);
+        let height = cal_height * sections_y as u32;
+        Geometry {
+            x: 0,
+            y: 0,
+            width,
+            height,
+        }
+    }
+}

src/widgets/clock.rs

@@ -0,0 +1,93 @@
+use std::default::Default;
+
+use crate::{
+    buffer::BufferView,
+    color::Color,
+    event::Event,
+    fonts::FontMap,
+    widgets::{Geometry, Widget},
+};
+
+use chrono::{Local, Timelike};
+
+pub struct Clock {
+    font: &'static str,
+    size: f32,
+    dirty: bool,
+    geometry: Geometry,
+    digit_width: u32,
+    colon_width: u32,
+}
+
+impl Clock {
+    pub fn new(fm: &mut FontMap, font: &'static str, size: f32) -> Clock {
+        fm.queue_font(font, size, "0123456789: ");
+        Clock {
+            font,
+            size,
+            dirty: true,
+            geometry: Default::default(),
+            digit_width: 0,
+            colon_width: 0,
+        }
+    }
+}
+
+impl Widget for Clock {
+    fn get_dirty(&self) -> bool {
+        self.dirty
+    }
+
+    fn geometry(&self) -> Geometry {
+        self.geometry
+    }
+
+    fn event(&mut self, event: &Event) {
+        if let Event::NewMinute = event {
+            self.dirty = true;
+        }
+    }
+
+    fn draw(&mut self, fonts: &mut FontMap, view: &mut BufferView) -> Geometry {
+        let time = Local::now().naive_local();
+        let fg = Color::WHITE;
+
+        let digit = self.digit_width;
+        let colon = self.colon_width;
+        let font = fonts.get_font(self.font, self.size);
+        font.draw_text_fixed_width(
+            view,
+            fg,
+            &[digit, digit, colon, digit, digit],
+            &format!("{:02}:{:02}", time.hour(), time.minute()),
+        )
+        .unwrap();
+        self.dirty = false;
+        self.geometry
+    }
+
+    fn geometry_update(&mut self, fonts: &mut FontMap, geometry: &Geometry) -> Geometry {
+        let font = fonts.get_font(self.font, self.size);
+        self.digit_width = font.auto_widest("0123456789").unwrap();
+        self.colon_width = font.auto_widest(":").unwrap();
+        self.geometry = Geometry {
+            x: geometry.x,
+            y: geometry.y,
+            width: self.digit_width * 4 + self.colon_width,
+            height: self.size.ceil() as u32,
+        };
+        self.geometry
+    }
+
+    fn minimum_size(&mut self, fonts: &mut FontMap) -> Geometry {
+        let font = fonts.get_font(self.font, self.size);
+        let digit_width = font.auto_widest("0123456789").unwrap();
+        let colon_width = font.auto_widest(":").unwrap();
+        Geometry {
+            x: 0,
+            y: 0,
+            width: digit_width * 4 + colon_width,
+            height: self.size.ceil() as u32,
+        }
+    }
+}

src/widgets/date.rs

@@ -0,0 +1,89 @@
+use std::default::Default;
+
+use crate::{
+    buffer::BufferView,
+    color::Color,
+    event::Event,
+    fonts::FontMap,
+    widgets::{Geometry, Widget},
+};
+
+use chrono::{Datelike, Local};
+
+pub struct Date {
+    font: &'static str,
+    size: f32,
+    dirty: bool,
+    geometry: Geometry,
+}
+
+impl Date {
+    pub fn new(fm: &mut FontMap, font: &'static str, size: f32) -> Date {
+        fm.queue_font(font, size, "0123456789/, adehinortuFMSTW");
+        Date {
+            font,
+            size,
+            dirty: true,
+            geometry: Default::default(),
+        }
+    }
+}
+
+impl Widget for Date {
+    fn get_dirty(&self) -> bool {
+        self.dirty
+    }
+
+    fn geometry(&self) -> Geometry {
+        self.geometry
+    }
+
+    fn event(&mut self, event: &Event) {
+        if let Event::NewMinute = event {
+            self.dirty = true;
+        }
+    }
+
+    fn draw(&mut self, fonts: &mut FontMap, view: &mut BufferView) -> Geometry {
+        let time = Local::now().naive_local();
+        let fg = Color::WHITE;
+        let font = fonts.get_font(self.font, self.size);
+        font.draw_text(
+            view,
+            fg,
+            &format!(
+                "{}, {:02}/{:02}/{:4}",
+                time.weekday(),
+                time.day(),
+                time.month(),
+                time.year()
+            ),
+        )
+        .unwrap();
+        self.dirty = false;
+        self.geometry
+    }
+
+    fn geometry_update(&mut self, fonts: &mut FontMap, geometry: &Geometry) -> Geometry {
+        let width = (3. + 2. + 2. + 2. + 4.) * self.size / 2.;
+        let font = fonts.get_font(self.font, self.size);
+        self.geometry = Geometry {
+            x: geometry.x,
+            y: geometry.y,
+            width: width.ceil() as u32,
+            height: font.height().ceil() as u32,
+        };
+        self.geometry
+    }
+
+    fn minimum_size(&mut self, fonts: &mut FontMap) -> Geometry {
+        let width = (3. + 2. + 2. + 2. + 4.) * self.size / 2.;
+        let font = fonts.get_font(self.font, self.size);
+        Geometry {
+            x: 0,
+            y: 0,
+            width: width.ceil() as u32,
+            height: font.height().ceil() as u32,
+        }
+    }
+}

src/widgets/launcher.rs

@@ -0,0 +1,917 @@
+use std::{
+    cmp::{Ordering, max, min},
+    collections::HashMap,
+    default::Default,
+    fs::{File, read_to_string},
+    io::Write,
+    process::{Command, exit},
+    sync::{Arc, Mutex},
+    thread,
+};
+
+use crate::{
+    buffer::BufferView,
+    color::Color,
+    event::{Event, Events, PointerButton, PointerEvent},
+    fonts::FontMap,
+    keyboard::{KeyEvent, keysyms},
+    utils::{
+        desktop::{Desktop, load_desktop_files},
+        xdg,
+    },
+    widgets::{Geometry, Widget},
+};
+
+use fuzzy_matcher::FuzzyMatcher;
+use fuzzy_matcher::skim::SkimMatcherV2;
+use unicode_segmentation::UnicodeSegmentation;
+use wayland_client::{WEnum, protocol::wl_keyboard};
+
+struct Matcher {
+    matches: HashMap<Desktop, i64>,
+}
+
+impl Matcher {
+    fn new() -> Self {
+        Self {
+            matches: HashMap::new(),
+        }
+    }
+
+    fn try_match(&mut self, dtop: Desktop, val: &str, input: &str, prio: f32) {
+        let fuzzy_matcher = SkimMatcherV2::default();
+        if let Some(ma) = fuzzy_matcher.fuzzy_match(val, input) {
+            let ma = ((ma as f32) * prio) as i64;
+            if let Some(ma_old) = self.matches.get(&dtop) {
+                // Skip over new matches for the same program that are worse
+                // than the one we already have.
+                if ma_old > &ma {
+                    return;
+                }
+            }
+
+            self.matches.insert(dtop, ma);
+        }
+    }
+
+    fn matches(&self) -> Vec<Desktop> {
+        let mut m = self
+            .matches
+            .iter()
+            .map(|(key, ma)| (*ma, key.clone()))
+            .collect::<Vec<(i64, Desktop)>>();
+
+        m.sort_by(|(ma1, d1), (ma2, d2)| {
+            if ma1 > ma2 {
+                Ordering::Less
+            } else if ma1 < ma2 {
+                Ordering::Greater
+            } else {
+                d1.cmp(d2)
+            }
+        });
+
+        m.into_iter().map(|(_, x)| x).collect()
+    }
+}
+
+enum PromptMode {
+    Normal,
+    Shell,
+    Calc,
+}
+
+struct Prompt {
+    input: String,
+    mode: PromptMode,
+    cursor: usize,
+}
+
+impl Prompt {
+    fn new() -> Prompt {
+        Prompt {
+            input: String::new(),
+            mode: PromptMode::Normal,
+            cursor: 0,
+        }
+    }
+
+    /// Length of the input in graphemes. The cursor is a grapheme index, not
+    /// a byte offset, so this (and never `input.len()`) is the upper bound.
+    fn len(&self) -> usize {
+        self.input.graphemes(true).count()
+    }
+
+    fn move_cursor(&mut self, distance: isize) {
+        let new_cursor = self.cursor as isize + distance;
+        let len = self.len() as isize;
+        if new_cursor < 0 {
+            self.cursor = 0;
+        } else if new_cursor > len {
+            self.cursor = len as usize;
+        } else {
+            self.cursor = new_cursor as usize;
+        }
+    }
+
+    fn set(&mut self, v: &str) {
+        self.input = v.to_string();
+        self.cursor = self.len();
+    }
+
+    fn append(&mut self, v: &str) {
+        if self.input.is_empty() {
+            match v {
+                "!" => {
+                    self.mode = PromptMode::Shell;
+                    return;
+                }
+                "=" => {
+                    self.mode = PromptMode::Calc;
+                    return;
+                }
+                _ => (),
+            }
+        }
+        let indices: Vec<(usize, &str)> = self.input.grapheme_indices(true).collect();
+        if self.cursor >= indices.len() {
+            self.cursor = indices.len();
+            self.input += v;
+        } else {
+            let index_at = indices[self.cursor].0;
+            self.input.insert_str(index_at, v);
+        }
+        self.cursor += v.graphemes(true).count();
+    }
+
+    fn backspace(&mut self) {
+        let mut indices: Vec<(usize, &str)> = self.input.grapheme_indices(true).collect();
+        if indices.is_empty() {
+            self.mode = PromptMode::Normal;
+            return;
+        }
+        if self.cursor == 0 {
+            return;
+        }
+        self.cursor -= 1;
+        indices.remove(self.cursor);
+        self.input = indices.iter().fold("".into(), |acc, el| acc + el.1);
+    }
+
+    fn delete(&mut self) {
+        let mut indices: Vec<(usize, &str)> = self.input.grapheme_indices(true).collect();
+        if indices.is_empty() {
+            self.mode = PromptMode::Normal;
+            return;
+        }
+        if self.cursor >= indices.len() {
+            return;
+        }
+
+        indices.remove(self.cursor);
+        self.input = indices.iter().fold("".into(), |acc, el| acc + el.1);
+    }
+
+    fn clear_right(&mut self) {
+        let indices: Vec<(usize, &str)> = self.input.grapheme_indices(true).collect();
+        if !indices.is_empty() {
+            self.cursor = min(self.cursor, indices.len());
+            self.input = indices[0..self.cursor]
+                .iter()
+                .fold("".into(), |acc, el| acc + el.1);
+        } else {
+            self.mode = PromptMode::Normal;
+        }
+    }
+
+    fn clear_left(&mut self) {
+        let indices: Vec<(usize, &str)> = self.input.grapheme_indices(true).collect();
+        if !indices.is_empty() {
+            self.cursor = min(self.cursor, indices.len());
+            self.input = indices[self.cursor..indices.len()]
+                .iter()
+                .fold("".into(), |acc, el| acc + el.1);
+            self.cursor = 0;
+        } else {
+            self.mode = PromptMode::Normal;
+        }
+    }
+
+    fn home(&mut self) {
+        self.cursor = 0;
+    }
+
+    fn end(&mut self) {
+        self.cursor = self.len();
+    }
+}
+
+/// Strip desktop-entry field codes (%f, %u, %i, %c, ...) from an Exec line and
+/// unescape `%%`. We never pass files/URLs, so the codes expand to nothing.
+fn strip_field_codes(exec: &str) -> String {
+    let mut out = String::with_capacity(exec.len());
+    let mut chars = exec.chars().peekable();
+    while let Some(c) = chars.next() {
+        if c != '%' {
+            out.push(c);
+            continue;
+        }
+        match chars.next() {
+            Some('%') => out.push('%'),
+            Some(_) => (),
+            None => (),
+        }
+    }
+    out
+}
+
+/// Path of a small persistent state file (calc history, saved prompt)
+/// under $XDG_STATE_HOME/wldash.
+fn state_path(name: &str) -> String {
+    format!("{}/wldash/{}", xdg::state_folder(), name)
+}
+
+/// Read a state file, falling back to where older versions kept it
+/// ($XDG_CACHE_HOME/wldash) so nothing is lost on upgrade.
+fn read_state(name: &str) -> Option<String> {
+    read_to_string(state_path(name))
+        .or_else(|_| read_to_string(format!("{}/wldash/{}", xdg::cache_folder(), name)))
+        .ok()
+}
+
+/// Create (truncate) a state file, making the directory on demand.
+fn create_state(name: &str) -> Option<File> {
+    let path = state_path(name);
+    if let Some(dir) = std::path::Path::new(&path).parent() {
+        let _ = std::fs::create_dir_all(dir);
+    }
+    File::create(path).ok()
+}
+
+trait InterfaceWidget {
+    /// Number of selectable rows (used to clamp the selection).
+    fn rows(&self) -> usize;
+    fn trigger(&mut self, intf: &mut InnerInterface);
+    fn draw(
+        &mut self,
+        intf: &InnerInterface,
+        fonts: &mut FontMap,
+        view: &mut BufferView,
+    ) -> Geometry;
+    fn update(&mut self, intf: &InnerInterface);
+}
+
+struct Launcher {
+    next_token: Option<String>,
+    options: Arc<Mutex<Vec<Desktop>>>,
+    matches: Vec<Desktop>,
+    launch_cmd: Option<String>,
+}
+
+impl Launcher {
+    fn new(events: Arc<Mutex<Events>>, launch_cmd: Option<String>) -> Launcher {
+        let options = Arc::new(Mutex::new(Vec::new()));
+        {
+            let options = Arc::clone(&options);
+            thread::Builder::new()
+                .name("desktopini".to_string())
+                .spawn(move || {
+                    let loaded = load_desktop_files();
+                    *options.lock().unwrap() = loaded;
+                    let mut events = events.lock().unwrap();
+                    events.add_event(Event::LauncherUpdate);
+                })
+                .unwrap();
+        }
+
+        Launcher {
+            next_token: None,
+            options,
+            matches: Vec::new(),
+            launch_cmd,
+        }
+    }
+
+    fn exec(&self, cmdline: &str) {
+        let mut cmd = Command::new("/bin/sh");
+        if let Some(token) = &self.next_token {
+            cmd.env("XDG_ACTIVATION_TOKEN", token);
+        }
+        cmd.arg("-c");
+        if let Some(l) = &self.launch_cmd {
+            cmd.arg(format!("{} {}", l, cmdline));
+        } else {
+            cmd.arg(cmdline);
+        }
+        match cmd.spawn() {
+            Ok(_) => exit(0),
+            Err(e) => {
+                eprintln!("wldash: failed to launch {:?}: {}", cmdline, e);
+                exit(1);
+            }
+        }
+    }
+}
+
+impl InterfaceWidget for Launcher {
+    fn rows(&self) -> usize {
+        self.matches.len()
+    }
+
+    fn trigger(&mut self, intf: &mut InnerInterface) {
+        if self.matches.len() > intf.selection {
+            let d = &self.matches[intf.selection];
+            let cmd = match (&d.exec, &d.url) {
+                (Some(exec), _) => strip_field_codes(exec),
+                // Type=Link entries have no Exec; open the URL instead.
+                (None, Some(url)) => format!("xdg-open '{}'", url.replace('\'', "'\\''")),
+                (None, None) => return,
+            };
+            // Terminal=true: run inside the user's terminal when one is
+            // configured, otherwise as before.
+            let cmd = match (d.term, std::env::var("TERMINAL")) {
+                (true, Ok(term)) if !term.is_empty() => format!("{} -e {}", term, cmd),
+                _ => cmd,
+            };
+            self.exec(&cmd);
+        }
+    }
+
+    fn update(&mut self, intf: &InnerInterface) {
+        let mut matcher = Matcher::new();
+        let options = self.options.lock().unwrap();
+        for desktop in options.iter() {
+            matcher.try_match(
+                desktop.clone(),
+                &desktop.name.to_lowercase(),
+                &intf.prompt.input.to_lowercase(),
+                1.0,
+            );
+            for keyword in desktop.keywords.iter() {
+                matcher.try_match(
+                    desktop.clone(),
+                    &keyword.to_lowercase(),
+                    &intf.prompt.input.to_lowercase(),
+                    0.5,
+                );
+            }
+        }
+
+        self.matches = matcher.matches();
+    }
+
+    fn draw(
+        &mut self,
+        intf: &InnerInterface,
+        fonts: &mut FontMap,
+        view: &mut BufferView,
+    ) -> Geometry {
+        let fg = Color::WHITE;
+
+        let line_height = intf.size.ceil() as u32;
+
+        // Draw line
+        let mut prompt_offset = intf.geometry.height - line_height;
+        let mut prompt_line = view.offset((0, prompt_offset));
+
+        let font = fonts.get_font(intf.font, intf.size);
+        let mut x_max = font
+            .auto_draw_text_with_cursor(
+                &mut prompt_line,
+                fg,
+                &format!("   {}", intf.prompt.input),
+                intf.prompt.cursor + 3,
+            )
+            .unwrap();
+
+        font.auto_draw_text(&mut prompt_line, fg, ">").unwrap();
+
+        // Draw entries
+        let dimfg = Color::GREY50;
+        prompt_offset -= 8;
+
+        for (idx, m) in self.matches.iter().enumerate() {
+            if prompt_offset < line_height {
+                break;
+            }
+            prompt_offset -= line_height;
+            let mut line = view.offset((0, prompt_offset));
+
+            if idx == intf.selection {
+                let fuzzy_matcher = SkimMatcherV2::default();
+                let (_, indices) = fuzzy_matcher
+                    .fuzzy_indices(&m.name.to_lowercase(), &intf.prompt.input.to_lowercase())
+                    .unwrap_or((0, vec![]));
+
+                let nchars = m.name.chars().count();
+                let mut colors = Vec::with_capacity(nchars);
+                for pos in 0..nchars {
+                    if indices.contains(&pos) {
+                        colors.push(Color::LIGHTORANGE);
+                    } else {
+                        colors.push(Color::GREY75);
+                    }
+                }
+                x_max = max(
+                    x_max,
+                    font.auto_draw_text_individual_colors(&mut line, &colors, &m.name)
+                        .unwrap(),
+                );
+            } else {
+                x_max = max(
+                    x_max,
+                    font.auto_draw_text(&mut line, dimfg, &m.name).unwrap(),
+                );
+            }
+        }
+
+        let content_height = min(
+            intf.geometry.height,
+            (self.matches.len() + 1) as u32 * line_height + 8,
+        );
+        let content_width = min(intf.geometry.width, x_max.0 + 1);
+        Geometry {
+            x: intf.geometry.x,
+            y: intf.geometry.y + intf.geometry.height - content_height,
+            width: content_width,
+            height: content_height,
+        }
+    }
+}
+
+struct Shell {
+    next_token: Option<String>,
+}
+
+impl Shell {
+    fn new() -> Shell {
+        Shell { next_token: None }
+    }
+
+    fn exec(&self, args: Vec<String>) {
+        let mut cmd = Command::new(args[0].clone());
+        if let Some(token) = &self.next_token {
+            cmd.env("XDG_ACTIVATION_TOKEN", token);
+        }
+        match cmd.args(&args[1..]).spawn() {
+            Ok(_) => exit(0),
+            Err(e) => {
+                eprintln!("wldash: failed to run {:?}: {}", args, e);
+                exit(1);
+            }
+        }
+    }
+}
+
+impl InterfaceWidget for Shell {
+    fn rows(&self) -> usize {
+        1
+    }
+
+    fn trigger(&mut self, intf: &mut InnerInterface) {
+        let args = vec![
+            "/bin/sh".to_string(),
+            "-c".to_string(),
+            intf.prompt.input.clone(),
+        ];
+        self.exec(args);
+    }
+
+    fn update(&mut self, _intf: &InnerInterface) {}
+
+    fn draw(
+        &mut self,
+        intf: &InnerInterface,
+        fonts: &mut FontMap,
+        view: &mut BufferView,
+    ) -> Geometry {
+        let fg = Color::WHITE;
+
+        let line_height = intf.size.ceil() as u32;
+
+        // Draw line
+        let prompt_offset = intf.geometry.height - line_height;
+        let mut prompt_line = view.offset((0, prompt_offset));
+
+        // Draw prompt
+        let font = fonts.get_font(intf.font, intf.size);
+        let x_max = font
+            .auto_draw_text_with_cursor(
+                &mut prompt_line,
+                fg,
+                &format!("   {}", intf.prompt.input),
+                intf.prompt.cursor + 3,
+            )
+            .unwrap();
+        font.auto_draw_text(&mut prompt_line, Color::BUFF, "!")
+            .unwrap();
+
+        Geometry {
+            x: intf.geometry.x,
+            y: intf.geometry.y + intf.geometry.height - line_height,
+            width: x_max.0 + 1,
+            height: line_height,
+        }
+    }
+}
+
+struct Calc {
+    old: Arc<Mutex<Vec<(String, String)>>>,
+    result: Option<String>,
+}
+
+impl Calc {
+    fn new() -> Calc {
+        let old: Arc<Mutex<Vec<(String, String)>>> = Arc::new(Mutex::new(Vec::new()));
+        let old_local = old.clone();
+        thread::Builder::new()
+            .name("calc".to_string())
+            .spawn(move || {
+                let s = match read_state("calc") {
+                    Some(s) => s,
+                    None => return,
+                };
+
+                let mut old = old_local.lock().unwrap();
+                for line in s.lines() {
+                    let pos = match line.find("=") {
+                        Some(v) => v,
+                        _ => continue,
+                    };
+                    let (input, res) = line.split_at(pos);
+                    let (input, res) = (input.trim(), res[1..].trim());
+                    old.push((input.to_string(), res.to_string()));
+                }
+            })
+            .unwrap();
+
+        Calc { old, result: None }
+    }
+
+    fn sync(&self) {
+        let mut f = match create_state("calc") {
+            Some(f) => f,
+            None => return,
+        };
+
+        let old = self.old.lock().unwrap();
+        for (input, res) in old.iter() {
+            writeln!(f, "{}={}", input, res).unwrap();
+        }
+        f.sync_data().unwrap();
+    }
+}
+
+impl InterfaceWidget for Calc {
+    fn rows(&self) -> usize {
+        // The live result plus the history entries.
+        self.old.lock().unwrap().len() + 1
+    }
+
+    fn trigger(&mut self, intf: &mut InnerInterface) {
+        let mut old = self.old.lock().unwrap();
+        if intf.selection == 0 {
+            if let Some(res) = &self.result {
+                old.push((intf.prompt.input.to_string(), res.to_string()));
+                while old.len() > 32 {
+                    old.remove(0);
+                }
+                drop(old);
+                self.sync();
+            }
+        } else if old.len() >= intf.selection {
+            let (input, res) = &old[old.len() - intf.selection];
+            self.result = Some(res.to_string());
+            intf.prompt.set(input);
+            intf.selection = 0;
+        }
+    }
+
+    fn update(&mut self, intf: &InnerInterface) {
+        let res =
+            rcalc_lib::parse::eval(&intf.prompt.input, &mut rcalc_lib::parse::CalcState::new())
+                .map(|x| format!("{}", x))
+                .map_err(|x| format!("{}", x));
+        self.result = res.ok();
+    }
+
+    fn draw(
+        &mut self,
+        intf: &InnerInterface,
+        fonts: &mut FontMap,
+        view: &mut BufferView,
+    ) -> Geometry {
+        let old = self.old.lock().unwrap();
+        let fg = Color::WHITE;
+
+        let line_height = intf.size.ceil() as u32;
+
+        // Draw line
+        let mut prompt_offset = intf.geometry.height - (line_height);
+        let mut prompt_line = view.offset((0, prompt_offset));
+
+        // Draw prompt
+        let font = fonts.get_font(intf.font, intf.size);
+        font.auto_draw_text_with_cursor(
+            &mut prompt_line,
+            fg,
+            &format!("   {} ", intf.prompt.input),
+            intf.prompt.cursor + 3,
+        )
+        .unwrap();
+
+        font.auto_draw_text(&mut prompt_line, Color::BUFF, "=")
+            .unwrap();
+
+        prompt_offset -= 8;
+        prompt_offset -= line_height;
+        if let Some(res) = &self.result {
+            let c = if intf.selection == 0 {
+                Color::LIGHTORANGE
+            } else {
+                Color::GREY50
+            };
+            let mut result_line = view.offset((0, prompt_offset));
+            font.auto_draw_text(&mut result_line, c, res).unwrap();
+        }
+
+        for (idx, (input, res)) in old.iter().rev().enumerate() {
+            if prompt_offset < line_height {
+                break;
+            }
+            let c = if idx + 1 == intf.selection {
+                Color::GREY75
+            } else {
+                Color::GREY50
+            };
+            prompt_offset -= line_height;
+            let mut result_line = view.offset((0, prompt_offset));
+            font.auto_draw_text(&mut result_line, c, &format!("{} = {}", input, res))
+                .unwrap();
+        }
+
+        let content_height = min(
+            intf.geometry.height,
+            (old.len() + 2) as u32 * line_height + 8,
+        );
+        Geometry {
+            x: intf.geometry.x,
+            y: intf.geometry.y + intf.geometry.height - content_height,
+            width: intf.geometry.width,
+            height: content_height,
+        }
+    }
+}
+
+struct InnerInterface {
+    font: &'static str,
+    size: f32,
+    dirty: bool,
+    geometry: Geometry,
+    selection: usize,
+    prompt: Prompt,
+}
+
+pub struct Interface {
+    launcher: Launcher,
+    shell: Shell,
+    calc: Calc,
+    inner: InnerInterface,
+}
+
+impl Interface {
+    pub fn new(
+        events: Arc<Mutex<Events>>,
+        fm: &mut FontMap,
+        font: &'static str,
+        size: f32,
+        launch_cmd: Option<String>,
+    ) -> Interface {
+        fm.queue_font(
+            font,
+            size,
+            "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 >=!,.-/()",
+        );
+
+        Interface {
+            launcher: Launcher::new(events, launch_cmd),
+            shell: Shell::new(),
+            calc: Calc::new(),
+            inner: InnerInterface {
+                font,
+                size,
+                dirty: false,
+                geometry: Default::default(),
+                selection: 0,
+                prompt: Prompt::new(),
+            },
+        }
+    }
+
+    fn pointer_input(&mut self, event: &PointerEvent) {
+        if let PointerButton::Left = event.button {
+            let line_height = self.inner.size.ceil() as u32;
+            if line_height == 0 {
+                return;
+            }
+            let height = self.inner.geometry.height.saturating_sub(line_height + 8);
+            let lines = height / line_height;
+
+            let offset = height % line_height;
+            let pos = if event.pos.1 >= offset {
+                event.pos.1 - offset
+            } else {
+                return;
+            };
+            let row = pos / line_height;
+            if row >= lines {
+                // Click landed on the prompt line or below.
+                return;
+            }
+            self.inner.selection = (lines - row - 1) as usize;
+            self.inner.dirty = true;
+        }
+    }
+
+    fn exit(&mut self) {
+        if self.inner.prompt.input.is_empty() {
+            std::process::exit(0);
+        }
+
+        if let Some(mut f) = create_state("prompt") {
+            let _ = write!(f, "{}", self.inner.prompt.input);
+            let _ = f.sync_data();
+        }
+        std::process::exit(0);
+    }
+
+    fn keyboard_input(&mut self, event: &KeyEvent) {
+        if event.state != WEnum::Value(wl_keyboard::KeyState::Pressed) {
+            return;
+        }
+        self.inner.dirty = true;
+        let widget = match self.inner.prompt.mode {
+            PromptMode::Shell => &mut self.shell as &mut dyn InterfaceWidget,
+            PromptMode::Normal => &mut self.launcher as &mut dyn InterfaceWidget,
+            PromptMode::Calc => &mut self.calc as &mut dyn InterfaceWidget,
+        };
+        match event.keysym {
+            keysyms::KEY_a if event.modifiers.ctrl => self.inner.prompt.home(),
+            keysyms::KEY_e if event.modifiers.ctrl => self.inner.prompt.end(),
+            keysyms::KEY_u if event.modifiers.ctrl => {
+                self.inner.prompt.clear_left();
+                self.inner.selection = 0;
+                widget.update(&self.inner);
+            }
+            keysyms::KEY_k if event.modifiers.ctrl => {
+                self.inner.prompt.clear_right();
+                self.inner.selection = 0;
+                widget.update(&self.inner);
+            }
+            keysyms::KEY_r if event.modifiers.ctrl => {
+                if let Some(s) = read_state("prompt") {
+                    self.inner.prompt.set(&s);
+                }
+            }
+            keysyms::KEY_Home => self.inner.prompt.home(),
+            keysyms::KEY_End => self.inner.prompt.end(),
+            keysyms::KEY_BackSpace => {
+                self.inner.prompt.backspace();
+                self.inner.selection = 0;
+                widget.update(&self.inner);
+            }
+            keysyms::KEY_Delete => {
+                self.inner.prompt.delete();
+                self.inner.selection = 0;
+                widget.update(&self.inner);
+            }
+            keysyms::KEY_Escape => self.exit(),
+            keysyms::KEY_Return => widget.trigger(&mut self.inner),
+            keysyms::KEY_Left => self.inner.prompt.move_cursor(-1),
+            keysyms::KEY_Right => self.inner.prompt.move_cursor(1),
+            keysyms::KEY_Up => {
+                let max = widget.rows().saturating_sub(1);
+                if self.inner.selection < max {
+                    self.inner.selection += 1;
+                }
+            }
+            keysyms::KEY_Down => {
+                if self.inner.selection > 0 {
+                    self.inner.selection -= 1;
+                }
+            }
+            _ => {
+                if let Some(utf8) = &event.utf8 {
+                    self.inner.prompt.append(utf8);
+                    self.inner.selection = 0;
+                    widget.update(&self.inner);
+                } else {
+                    self.inner.dirty = false;
+                }
+            }
+        }
+    }
+}
+
+impl Widget for Interface {
+    fn get_dirty(&self) -> bool {
+        self.inner.dirty
+    }
+
+    fn geometry(&self) -> Geometry {
+        self.inner.geometry
+    }
+
+    fn draw(&mut self, fonts: &mut FontMap, view: &mut BufferView) -> Geometry {
+        self.inner.dirty = false;
+        match self.inner.prompt.mode {
+            PromptMode::Shell => self.shell.draw(&self.inner, fonts, view),
+            PromptMode::Normal => self.launcher.draw(&self.inner, fonts, view),
+            PromptMode::Calc => self.calc.draw(&self.inner, fonts, view),
+        }
+    }
+
+    fn geometry_update(&mut self, _fonts: &mut FontMap, geometry: &Geometry) -> Geometry {
+        self.inner.geometry = *geometry;
+        self.inner.geometry
+    }
+
+    fn minimum_size(&mut self, _fonts: &mut FontMap) -> Geometry {
+        Geometry {
+            x: 0,
+            y: 0,
+            width: 256,
+            height: (self.inner.size.ceil() as u32) * 4 + 8,
+        }
+    }
+
+    fn event(&mut self, event: &Event) {
+        match event {
+            Event::KeyEvent(e) => self.keyboard_input(e),
+            Event::PointerEvent(e) => self.pointer_input(e),
+            Event::FocusLost => self.exit(),
+            Event::LauncherUpdate => {
+                self.inner.dirty = true;
+                self.launcher.update(&self.inner);
+            }
+            Event::TokenUpdate(t) => {
+                self.launcher.next_token = Some(t.to_string());
+                self.shell.next_token = Some(t.to_string());
+            }
+            _ => (),
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::{Prompt, PromptMode, strip_field_codes};
+
+    #[test]
+    fn prompt_cursor_is_grapheme_based() {
+        let mut p = Prompt::new();
+        p.append("ø");
+        p.append("å");
+        assert_eq!(p.cursor, 2);
+        p.end();
+        assert_eq!(p.cursor, 2);
+        // Used to index past the grapheme table and panic.
+        p.append("a");
+        assert_eq!(p.input, "øåa");
+        p.move_cursor(-10);
+        assert_eq!(p.cursor, 0);
+        p.move_cursor(100);
+        assert_eq!(p.cursor, 3);
+        p.backspace();
+        assert_eq!(p.input, "øå");
+        p.home();
+        p.delete();
+        assert_eq!(p.input, "å");
+        p.set("blå");
+        assert_eq!(p.cursor, 3);
+        p.move_cursor(-1);
+        p.clear_right();
+        assert_eq!(p.input, "bl");
+        p.clear_left();
+        assert_eq!(p.input, "");
+        assert_eq!(p.cursor, 0);
+    }
+
+    #[test]
+    fn prompt_prefix_switches_mode() {
+        let mut p = Prompt::new();
+        p.append("=");
+        assert!(matches!(p.mode, PromptMode::Calc));
+        assert_eq!(p.input, "");
+        p.backspace();
+        assert!(matches!(p.mode, PromptMode::Normal));
+    }
+
+    #[test]
+    fn field_codes_are_stripped() {
+        assert_eq!(strip_field_codes("firefox %u"), "firefox ");
+        assert_eq!(strip_field_codes("app --icon %i %c %k"), "app --icon   ");
+        assert_eq!(strip_field_codes("echo 100%% %F"), "echo 100% ");
+        assert_eq!(strip_field_codes("plain"), "plain");
+    }
+}

src/widgets/layout.rs

@@ -0,0 +1,286 @@
+// Constructors here deliberately return Box<dyn Layout> so configs compose.
+#![allow(clippy::new_ret_no_self)]
+
+use std::cmp::max;
+
+use crate::{fonts::FontMap, state::State, widgets::Geometry};
+
+pub trait Layout {
+    fn geometry_update(
+        &self,
+        fonts: &mut FontMap,
+        geometry: &Geometry,
+        state: &mut State,
+    ) -> Geometry;
+
+    fn minimum_size(&self, fonts: &mut FontMap, state: &mut State) -> Geometry;
+}
+
+pub struct HorizontalLayout {
+    pub widgets: Vec<Box<dyn Layout>>,
+}
+
+impl HorizontalLayout {
+    pub fn new(widgets: Vec<Box<dyn Layout>>) -> Box<dyn Layout> {
+        Box::new(HorizontalLayout { widgets })
+    }
+}
+
+impl Layout for HorizontalLayout {
+    fn geometry_update(
+        &self,
+        fonts: &mut FontMap,
+        geometry: &Geometry,
+        state: &mut State,
+    ) -> Geometry {
+        let mut geo = *geometry;
+        let mut max_width = 0;
+        let mut max_height = 0;
+        for w in self.widgets.iter() {
+            let result = w.geometry_update(fonts, &geo, state);
+            geo.x = result.x + result.width;
+            geo.width -= result.width;
+            max_width += result.width;
+            max_height = max(result.height, max_height);
+        }
+        geo.width = max_width;
+        geo.height = max_height;
+        geo
+    }
+
+    fn minimum_size(&self, fonts: &mut FontMap, state: &mut State) -> Geometry {
+        let mut max_width = 0;
+        let mut max_height = 0;
+        for w in self.widgets.iter() {
+            let result = w.minimum_size(fonts, state);
+            max_width += result.x + result.width;
+            max_height = max(result.y + result.height, max_height);
+        }
+        Geometry {
+            width: max_width,
+            height: max_height,
+            x: 0,
+            y: 0,
+        }
+    }
+}
+
+pub struct VerticalLayout {
+    pub widgets: Vec<Box<dyn Layout>>,
+}
+
+impl VerticalLayout {
+    pub fn new(widgets: Vec<Box<dyn Layout>>) -> Box<dyn Layout> {
+        Box::new(VerticalLayout { widgets })
+    }
+}
+
+impl Layout for VerticalLayout {
+    fn geometry_update(
+        &self,
+        fonts: &mut FontMap,
+        geometry: &Geometry,
+        state: &mut State,
+    ) -> Geometry {
+        let mut geo = *geometry;
+        let mut max_width = 0;
+        let mut max_height = 0;
+        for w in self.widgets.iter() {
+            let result = w.geometry_update(fonts, &geo, state);
+            geo.y = result.y + result.height;
+            geo.height -= result.height;
+            max_width = max(result.width, max_width);
+            max_height += result.height;
+        }
+        geo.width = max_width;
+        geo.height = max_height;
+        geo
+    }
+
+    fn minimum_size(&self, fonts: &mut FontMap, state: &mut State) -> Geometry {
+        let mut max_width = 0;
+        let mut max_height = 0;
+        for w in self.widgets.iter() {
+            let result = w.minimum_size(fonts, state);
+            max_width = max(result.x + result.width, max_width);
+            max_height += result.y + result.height;
+        }
+        Geometry {
+            width: max_width,
+            height: max_height,
+            x: 0,
+            y: 0,
+        }
+    }
+}
+
+pub trait WidgetUpdater {
+    fn geometry_update(&mut self, idx: usize, fonts: &mut FontMap, geometry: &Geometry)
+    -> Geometry;
+    fn minimum_size(&mut self, idx: usize, fonts: &mut FontMap) -> Geometry;
+}
+
+pub struct IndexedLayout {
+    pub widget_idx: usize,
+}
+
+impl IndexedLayout {
+    pub fn new(widget_idx: usize) -> Box<dyn Layout> {
+        Box::new(IndexedLayout { widget_idx })
+    }
+}
+
+impl Layout for IndexedLayout {
+    fn geometry_update(
+        &self,
+        fonts: &mut FontMap,
+        geometry: &Geometry,
+        state: &mut State,
+    ) -> Geometry {
+        state.geometry_update(self.widget_idx, fonts, geometry)
+    }
+
+    fn minimum_size(&self, fonts: &mut FontMap, state: &mut State) -> Geometry {
+        state.minimum_size(self.widget_idx, fonts)
+    }
+}
+
+pub struct InvertedHorizontalLayout {
+    pub widgets: Vec<Box<dyn Layout>>,
+}
+
+impl InvertedHorizontalLayout {
+    pub fn new(widgets: Vec<Box<dyn Layout>>) -> Box<dyn Layout> {
+        Box::new(InvertedHorizontalLayout { widgets })
+    }
+}
+
+impl Layout for InvertedHorizontalLayout {
+    fn geometry_update(
+        &self,
+        fonts: &mut FontMap,
+        geometry: &Geometry,
+        state: &mut State,
+    ) -> Geometry {
+        let mut geo = *geometry;
+        let mut max_height = 0;
+        for w in self.widgets.iter() {
+            let mut temp_geo = geo;
+            let temp_result = w.geometry_update(fonts, &temp_geo, state);
+            temp_geo.x = geo.x + (geo.width - temp_result.width);
+            let result = w.geometry_update(fonts, &temp_geo, state);
+            geo.width -= result.width;
+            max_height = max(result.height, max_height);
+        }
+        geo.height = max_height;
+        geo
+    }
+
+    fn minimum_size(&self, fonts: &mut FontMap, state: &mut State) -> Geometry {
+        let mut max_width = 0;
+        let mut max_height = 0;
+        for w in self.widgets.iter() {
+            let result = w.minimum_size(fonts, state);
+            max_width += result.x + result.width;
+            max_height = max(result.y + result.height, max_height);
+        }
+        Geometry {
+            width: max_width,
+            height: max_height,
+            x: 0,
+            y: 0,
+        }
+    }
+}
+
+pub struct InvertedVerticalLayout {
+    pub widgets: Vec<Box<dyn Layout>>,
+}
+
+impl InvertedVerticalLayout {
+    pub fn new(widgets: Vec<Box<dyn Layout>>) -> Box<dyn Layout> {
+        Box::new(InvertedVerticalLayout { widgets })
+    }
+}
+
+impl Layout for InvertedVerticalLayout {
+    fn geometry_update(
+        &self,
+        fonts: &mut FontMap,
+        geometry: &Geometry,
+        state: &mut State,
+    ) -> Geometry {
+        let mut geo = *geometry;
+        let mut max_width = 0;
+        for w in self.widgets.iter() {
+            let mut temp_geo = geo;
+            let temp_result = w.geometry_update(fonts, &temp_geo, state);
+            temp_geo.y = geo.y + (geo.height - temp_result.height);
+            let result = w.geometry_update(fonts, &temp_geo, state);
+            geo.height -= result.height;
+            max_width = max(result.width, max_width);
+        }
+        geo.width = max_width;
+        geo
+    }
+
+    fn minimum_size(&self, fonts: &mut FontMap, state: &mut State) -> Geometry {
+        let mut max_width = 0;
+        let mut max_height = 0;
+        for w in self.widgets.iter() {
+            let result = w.minimum_size(fonts, state);
+            max_width = max(result.x + result.width, max_width);
+            max_height += result.y + result.height;
+        }
+        Geometry {
+            width: max_width,
+            height: max_height,
+            x: 0,
+            y: 0,
+        }
+    }
+}
+
+pub struct Margin {
+    pub widget: Box<dyn Layout>,
+    pub margin: (u32, u32, u32, u32),
+}
+
+impl Margin {
+    pub fn new(widget: Box<dyn Layout>, margin: (u32, u32, u32, u32)) -> Box<dyn Layout> {
+        Box::new(Margin { widget, margin })
+    }
+}
+
+impl Layout for Margin {
+    fn geometry_update(
+        &self,
+        fonts: &mut FontMap,
+        geometry: &Geometry,
+        state: &mut State,
+    ) -> Geometry {
+        let geo = Geometry {
+            x: geometry.x + self.margin.0,
+            y: geometry.y + self.margin.1,
+            width: geometry.width - self.margin.0 - self.margin.2,
+            height: geometry.height - self.margin.1 - self.margin.3,
+        };
+        let out = self.widget.geometry_update(fonts, &geo, state);
+        Geometry {
+            x: out.x - self.margin.0,
+            y: out.y - self.margin.1,
+            width: out.width + self.margin.0 + self.margin.2,
+            height: out.height + self.margin.1 + self.margin.3,
+        }
+    }
+
+    fn minimum_size(&self, fonts: &mut FontMap, state: &mut State) -> Geometry {
+        let size = self.widget.minimum_size(fonts, state);
+        Geometry {
+            width: size.x + size.width + self.margin.0 + self.margin.2,
+            height: size.y + size.height + self.margin.1 + self.margin.3,
+            x: 0,
+            y: 0,
+        }
+    }
+}

src/widgets/line.rs

@@ -0,0 +1,62 @@
+use std::default::Default;
+
+use crate::{
+    buffer::BufferView,
+    color::Color,
+    fonts::FontMap,
+    widgets::{Geometry, Widget},
+};
+
+pub struct Line {
+    geometry: Geometry,
+    thickness: u32,
+    vertical: bool,
+}
+
+impl Line {
+    pub fn new(thickness: u32, vertical: bool) -> Line {
+        Line {
+            geometry: Default::default(),
+            thickness,
+            vertical,
+        }
+    }
+}
+
+impl Widget for Line {
+    fn geometry(&self) -> Geometry {
+        self.geometry
+    }
+
+    fn draw(&mut self, _fonts: &mut FontMap, view: &mut BufferView) -> Geometry {
+        view.memset(Color::WHITE);
+        self.geometry
+    }
+
+    fn geometry_update(&mut self, _fonts: &mut FontMap, geometry: &Geometry) -> Geometry {
+        self.geometry = Geometry {
+            x: geometry.x,
+            y: geometry.y,
+            width: if self.vertical {
+                self.thickness
+            } else {
+                geometry.width
+            },
+            height: if self.vertical {
+                geometry.height
+            } else {
+                self.thickness
+            },
+        };
+        self.geometry
+    }
+
+    fn minimum_size(&mut self, _fonts: &mut FontMap) -> Geometry {
+        Geometry {
+            x: 0,
+            y: 0,
+            width: if self.vertical { self.thickness } else { 1 },
+            height: if self.vertical { 1 } else { self.thickness },
+        }
+    }
+}

src/widgets/mod.rs

@@ -0,0 +1,27 @@
+//mod alsaaudio;
+mod backlight;
+mod bar_widget;
+mod battery;
+mod calendar;
+mod clock;
+mod date;
+mod launcher;
+mod layout;
+mod line;
+mod pulseaudio;
+mod widget;
+
+//pub use alsaaudio::AlsaAudio;
+pub use backlight::Backlight;
+pub use battery::Battery;
+pub use calendar::Calendar;
+pub use clock::Clock;
+pub use date::Date;
+pub use launcher::Interface;
+pub use layout::{
+    HorizontalLayout, IndexedLayout, InvertedHorizontalLayout, InvertedVerticalLayout, Layout,
+    Margin, VerticalLayout, WidgetUpdater,
+};
+pub use line::Line;
+pub use pulseaudio::PulseAudio;
+pub use widget::{Geometry, Widget};

src/widgets/pulseaudio.rs

@@ -0,0 +1,256 @@
+use std::{
+    cell::RefCell,
+    error::Error,
+    os::fd::RawFd,
+    rc::Rc,
+    sync::{Arc, Mutex},
+    thread,
+};
+
+use nix::unistd::{pipe, read, write};
+
+use crate::{
+    color::Color,
+    event::{Event, Events, PointerButton},
+    fonts::FontMap,
+    widgets::bar_widget::{BarWidget, BarWidgetImpl},
+};
+
+use libpulse_binding::volume::ChannelVolumes;
+
+fn monitor(
+    events: Arc<Mutex<Events>>,
+    inner: Arc<Mutex<InnerAudio>>,
+    pipe: RawFd,
+) -> Result<(), Box<dyn Error>> {
+    use libpulse_binding::{
+        callbacks::ListResult,
+        context::{
+            Context, FlagSet, State,
+            subscribe::{Facility, InterestMaskSet},
+        },
+        mainloop::{
+            self, api::Mainloop, events::io::FlagSet as IoFlagSet, standard::IterateResult,
+        },
+        proplist::{Proplist, properties},
+        volume::Volume,
+    };
+
+    let mut proplist = Proplist::new().unwrap();
+    proplist
+        .set_str(properties::APPLICATION_NAME, "wldash")
+        .unwrap();
+
+    let mut mainloop = mainloop::standard::Mainloop::new().unwrap();
+    let context = Rc::new(RefCell::new(
+        Context::new_with_proplist(&mainloop, "wldash_context", &proplist).unwrap(),
+    ));
+    context.borrow_mut().connect(None, FlagSet::NOFLAGS, None)?;
+
+    loop {
+        match mainloop.iterate(true) {
+            IterateResult::Quit(_) | IterateResult::Err(_) => {
+                return Err("pulseaudio mainloop quit while connecting".into());
+            }
+            _ => (),
+        }
+        match context.borrow().get_state() {
+            State::Ready => break,
+            State::Failed | State::Terminated => {
+                return Err("could not connect to pulseaudio".into());
+            }
+            _ => (),
+        }
+    }
+
+    let local_context = context.clone();
+    let local_inner = inner.clone();
+    let local_events = events.clone();
+    context.borrow_mut().set_subscribe_callback(Some(Box::new(
+        move |facility, _operation, index| {
+            if let Some(Facility::Sink) = facility {
+                let introspector = local_context.borrow_mut().introspect();
+                let inner = local_inner.clone();
+                let events = local_events.clone();
+                introspector.get_sink_info_by_index(index, move |res| match res {
+                    ListResult::End | ListResult::Error => (),
+                    ListResult::Item(sink_info) => {
+                        if sink_info.name.is_some() {
+                            let avg = sink_info.volume.avg().0 as f32 / Volume::NORMAL.0 as f32;
+                            let mut inner = inner.lock().unwrap();
+                            inner.volume = avg;
+                            inner.mute = sink_info.mute;
+                            inner.dirty = true;
+                            drop(inner);
+                            let mut events = events.lock().unwrap();
+                            events.add_event(Event::AudioUpdate);
+                        }
+                    }
+                });
+            }
+        },
+    )));
+
+    context
+        .borrow_mut()
+        .subscribe(InterestMaskSet::SINK, |_| {});
+
+    let introspector = context.borrow_mut().introspect();
+    let local_inner = inner.clone();
+    introspector.get_sink_info_by_name("@DEFAULT_SINK@", move |res| match res {
+        ListResult::End | ListResult::Error => (),
+        ListResult::Item(sink_info) => {
+            if sink_info.name.is_some() {
+                let avg = sink_info.volume.avg().0 as f32 / Volume::NORMAL.0 as f32;
+                let mut inner = local_inner.lock().unwrap();
+                inner.volume = avg;
+                inner.channel_volume = Some(sink_info.volume);
+                inner.mute = sink_info.mute;
+                inner.dirty = true;
+                drop(inner);
+                let mut events = events.lock().unwrap();
+                events.add_event(Event::AudioUpdate);
+            }
+        }
+    });
+    drop(introspector);
+
+    let local_context = context.clone();
+    let local_inner = inner.clone();
+    let event_source = mainloop.new_io_event(
+        pipe,
+        IoFlagSet::INPUT,
+        Box::new(move |_, _, _| {
+            let mut buf = [0; 8];
+            _ = read(pipe, &mut buf);
+
+            let mut inner = local_inner.lock().unwrap();
+            let mut introspector = local_context.borrow_mut().introspect();
+            // Clicks arriving before the first sink query finished have no
+            // channel map to work with; drop them instead of panicking.
+            match (inner.last_click.take(), inner.channel_volume) {
+                (Some(Change::Volume(volume)), Some(mut vol)) => {
+                    vol.scale(Volume((volume * Volume::NORMAL.0 as f32).round() as u32));
+                    introspector.set_sink_volume_by_name("@DEFAULT_SINK@", &vol, None);
+                }
+                (Some(Change::VolumeInc(value)), Some(mut vol)) => {
+                    // apply step to volumes
+                    let step = (value * Volume::NORMAL.0 as f32).round() as i32;
+                    if step > 0 {
+                        vol.inc_clamp(Volume(step as u32), Volume::NORMAL);
+                    } else {
+                        vol.decrease(Volume(-step as u32));
+                    }
+                    // HACK: It would be better to only update the volume from feedback, but axis
+                    // events fire fast and require the last set volume immediately for reference.
+                    inner.channel_volume = Some(vol);
+                    introspector.set_sink_volume_by_name("@DEFAULT_SINK@", &vol, None);
+                }
+                (Some(Change::ToggleMute), _) => {
+                    introspector.set_sink_mute_by_name("@DEFAULT_SINK@", !inner.mute, None);
+                }
+                _ => (),
+            }
+        }),
+    );
+
+    loop {
+        match mainloop.iterate(true) {
+            IterateResult::Quit(_) | IterateResult::Err(_) => break,
+            _ => (),
+        }
+    }
+
+    // Need to keep the event source alive
+    _ = event_source;
+
+    Ok(())
+}
+
+fn start_monitor(events: Arc<Mutex<Events>>, inner: Arc<Mutex<InnerAudio>>, pipe: RawFd) {
+    thread::Builder::new()
+        .name("audiomon".to_string())
+        .spawn(move || {
+            // panic = "abort" in release: a failed audio connection must not
+            // kill the dashboard. The widget simply stays at 0.
+            if let Err(e) = monitor(events, inner, pipe) {
+                eprintln!("wldash: audio monitor stopped: {}", e);
+            }
+        })
+        .unwrap();
+}
+
+enum Change {
+    Volume(f32),
+    VolumeInc(f32),
+    ToggleMute,
+}
+
+struct InnerAudio {
+    volume: f32,
+    channel_volume: Option<ChannelVolumes>,
+    mute: bool,
+    dirty: bool,
+    last_click: Option<Change>,
+    pipe: RawFd,
+}
+
+pub struct PulseAudio {
+    inner: Arc<Mutex<InnerAudio>>,
+}
+
+impl PulseAudio {
+    // Wraps the impl in the generic BarWidget on purpose.
+    #[allow(clippy::new_ret_no_self)]
+    pub fn new(
+        events: Arc<Mutex<Events>>,
+        fm: &mut FontMap,
+        font: &'static str,
+        size: f32,
+    ) -> BarWidget {
+        let (a, b) = pipe().unwrap();
+        let audio = PulseAudio {
+            inner: Arc::new(Mutex::new(InnerAudio {
+                volume: 0.0,
+                channel_volume: None,
+                mute: false,
+                dirty: false,
+                last_click: None,
+                pipe: b,
+            })),
+        };
+        start_monitor(events, audio.inner.clone(), a);
+        BarWidget::new(Box::new(audio), fm, font, size)
+    }
+}
+
+impl BarWidgetImpl for PulseAudio {
+    fn get_dirty(&self) -> bool {
+        self.inner.lock().unwrap().dirty
+    }
+    fn name(&self) -> &'static str {
+        "volume"
+    }
+    fn value(&mut self) -> f32 {
+        let mut inner = self.inner.lock().unwrap();
+        inner.dirty = false;
+        inner.volume
+    }
+    fn color(&self) -> Color {
+        match self.inner.lock().unwrap().mute {
+            true => Color::YELLOW,
+            false => Color::WHITE,
+        }
+    }
+    fn click(&mut self, pos: f32, btn: PointerButton) {
+        let mut inner = self.inner.lock().unwrap();
+        inner.last_click = match btn {
+            PointerButton::Left => Some(Change::Volume(pos)),
+            PointerButton::Right => Some(Change::ToggleMute),
+            PointerButton::ScrollVertical(val) => Some(Change::VolumeInc((val / 512.) as f32)),
+            PointerButton::ScrollHorizontal(val) => Some(Change::VolumeInc((val / 100.) as f32)),
+            _ => None,
+        };
+        _ = write(inner.pipe, &[0]);
+    }
+}

src/widgets/widget.rs

@@ -0,0 +1,96 @@
+use std::{
+    cmp::{max, min},
+    fmt,
+};
+
+use crate::{buffer::BufferView, event::Event, fonts::FontMap};
+
+#[derive(Debug, Default, Clone, Copy)]
+pub struct Geometry {
+    pub x: u32,
+    pub y: u32,
+    pub width: u32,
+    pub height: u32,
+}
+
+impl fmt::Display for Geometry {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "(x: {}, y: {}, width: {}, height: {})",
+            self.x, self.y, self.width, self.height
+        )
+    }
+}
+
+impl Geometry {
+    pub fn new() -> Geometry {
+        Geometry {
+            x: 0,
+            y: 0,
+            width: 0,
+            height: 0,
+        }
+    }
+
+    pub fn expand(&self, other: Geometry) -> Geometry {
+        let x = min(self.x, other.x);
+        let y = min(self.y, other.y);
+        Geometry {
+            x,
+            y,
+            width: max(self.width + self.x, other.width + other.x) - x,
+            height: max(self.height + self.y, other.height + other.y) - y,
+        }
+    }
+
+    pub fn contains(&self, position: (u32, u32)) -> bool {
+        position.0 >= self.x
+            && position.0 < self.x + self.width
+            && position.1 >= self.y
+            && position.1 < self.y + self.height
+    }
+}
+
+pub trait Widget {
+    fn get_dirty(&self) -> bool {
+        false
+    }
+    fn geometry(&self) -> Geometry;
+    fn geometry_update(&mut self, fonts: &mut FontMap, geometry: &Geometry) -> Geometry;
+    fn minimum_size(&mut self, _fonts: &mut FontMap) -> Geometry {
+        Default::default()
+    }
+    fn draw(&mut self, fonts: &mut FontMap, view: &mut BufferView) -> Geometry;
+    fn event(&mut self, _event: &Event) {}
+}
+
+#[cfg(test)]
+mod tests {
+    use super::Geometry;
+
+    #[test]
+    fn expand_is_bounding_box() {
+        let a = Geometry {
+            x: 10,
+            y: 20,
+            width: 5,
+            height: 5,
+        };
+        let b = Geometry {
+            x: 0,
+            y: 100,
+            width: 2,
+            height: 2,
+        };
+        let e = a.expand(b);
+        assert_eq!((e.x, e.y), (0, 20));
+        assert_eq!(e.x + e.width, 15);
+        assert_eq!(e.y + e.height, 102);
+        let e2 = b.expand(a);
+        assert_eq!(
+            (e2.x, e2.y, e2.width, e2.height),
+            (e.x, e.y, e.width, e.height)
+        );
+    }
+}