release: cargo-release config for tag-driven releases

`cargo release patch --execute` now does what the last three releases did by hand: bump Cargo.toml/Cargo.lock, rewrite PKGBUILD's pkgver, stamp the "## Unreleased" changelog section with version and date, commit as "release X.Y.Z", tag vX.Y.Z and push commit and tag to the gitea remote (not `origin`, which is the GitHub upstream). The tag then triggers .gitea/workflows/release.yml as before. No crates.io publish. CHANGELOG.md gets a standing "## Unreleased" section to collect entries between releases; README documents the flow. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
backlight: run without a backlight device instead of panicking (0.4.3)
2026-10-07 15:48:45 +02:00 · 2026-10-05 13:54:13 +02:00 · 2026-10-03 09:50:02 +00:00 · 2026-10-03 09:42:49 +00:00 · 2026-10-03 09:33:12 +00:00 · 2026-10-03 09:28:22 +00:00
34 changed files with 1811 additions and 725 deletions
@@ -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
@@ -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 $tag exists"
@@ -0,0 +1,3 @@
+# These are supported funding model platforms
+
+liberapay: kennylevinsen
@@ -0,0 +1,33 @@
+# Changelog
+
+## Unreleased
+
+## 0.4.3 (2026-10-05)
+
+- Backlight: a config with a `!backlight` widget on a machine without `/sys/class/backlight` entries (or with a `device` name that does not exist) panicked at start ("did not find backlight device"), fatal with `panic = "abort"`. The widget now warns once on stderr, renders empty and ignores clicks, so one config can be shared between a laptop and a desktop.
+
+## 0.4.2 (2026-10-03)
+
+- Fonts: a `font_paths` entry pointing at a file that does not exist on this machine made the font-loader thread panic and abort wldash ("Font file not found"). Pinned paths that are missing now fall back to fontconfig by name, with one line on stderr; a font that cannot be resolved at all exits with a clear message instead of a backtrace.
+- `--write-default-config` no longer writes absolute font paths. Configs shared between machines with different font package layouts (`fonts/noto` vs `fonts/google-noto`) were breaking on the second host; names are resolved per machine instead. Existing configs keep working, and `font_paths` can still pin a file on purpose.
+
+## 0.4.1 (2026-10-03)
+
+- No more desktop-file cache: wldash scanned `~/.cache/wldash/desktop.json` (on NFS for shared homes, and stale after every package install) and needed a manual `--desktop-refresh`. Desktop files are now scanned on a background thread at every start, a few milliseconds over local `/usr/share`. `--desktop-refresh` is a no-op kept for key bindings; `simd-json` is gone.
+- Calculator history and the Escape-saved prompt moved from `$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.
@@ -8,18 +8,6 @@ version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c71b1793ee61086797f5c80b6efa2b8ffa6d5dd703f118545808a7f2e27f7046"

-[[package]]
-name = "ahash"
-version = "0.8.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "77c3a9648d43b9cd48db467b3f87fdd6e146bcc88ab0180006cef2179fe11d01"
-dependencies = [
- "cfg-if",
- "once_cell",
- "version_check",
- "zerocopy",
-]
-
 [[package]]
 name = "android-tzdata"
 version = "0.1.1"
@@ -188,15 +176,6 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5443807d6dff69373d433ab9ef5378ad8df50ca6298caf15de6e52e24aaf54d5"

-[[package]]
-name = "float-cmp"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "98de4bbd547a563b716d8dfa9aad1cb19bfab00f4fa09a6a4ed21dbcf44ce9c4"
-dependencies = [
- "num-traits",
-]
-
 [[package]]
 name = "fontconfig"
 version = "0.8.0"
@@ -225,38 +204,6 @@ dependencies = [
 "version_check",
 ]

-[[package]]
-name = "getrandom"
-version = "0.2.12"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "190092ea657667030ac6a35e305e62fc4dd69fd98ac98631e5d3a2b1575a12b5"
-dependencies = [
- "cfg-if",
- "js-sys",
- "libc",
- "wasi",
- "wasm-bindgen",
-]
-
-[[package]]
-name = "halfbrown"
-version = "0.2.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5681137554ddff44396e5f149892c769d45301dd9aa19c51602a89ee214cb0ec"
-dependencies = [
- "hashbrown 0.13.2",
- "serde",
-]
-
-[[package]]
-name = "hashbrown"
-version = "0.13.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "43a3c133739dddd0d2990f9a4bdf8eb4b21ef50e4851ca85ab661199821d510e"
-dependencies = [
- "ahash",
-]
-
 [[package]]
 name = "hashbrown"
 version = "0.14.3"
@@ -299,7 +246,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "433de089bd45971eecf4668ee0ee8f4cec17db4f8bd8f7bc3197a6ce37aa7d9b"
 dependencies = [
 "equivalent",
- "hashbrown 0.14.3",
+ "hashbrown",
 ]

 [[package]]
@@ -334,70 +281,6 @@ version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"

-[[package]]
-name = "lexical-core"
-version = "0.8.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2cde5de06e8d4c2faabc400238f9ae1c74d5412d03a7bd067645ccbc47070e46"
-dependencies = [
- "lexical-parse-float",
- "lexical-parse-integer",
- "lexical-util",
- "lexical-write-float",
- "lexical-write-integer",
-]
-
-[[package]]
-name = "lexical-parse-float"
-version = "0.8.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "683b3a5ebd0130b8fb52ba0bdc718cc56815b6a097e28ae5a6997d0ad17dc05f"
-dependencies = [
- "lexical-parse-integer",
- "lexical-util",
- "static_assertions",
-]
-
-[[package]]
-name = "lexical-parse-integer"
-version = "0.8.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d0994485ed0c312f6d965766754ea177d07f9c00c9b82a5ee62ed5b47945ee9"
-dependencies = [
- "lexical-util",
- "static_assertions",
-]
-
-[[package]]
-name = "lexical-util"
-version = "0.8.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5255b9ff16ff898710eb9eb63cb39248ea8a5bb036bea8085b1a767ff6c4e3fc"
-dependencies = [
- "static_assertions",
-]
-
-[[package]]
-name = "lexical-write-float"
-version = "0.8.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "accabaa1c4581f05a3923d1b4cfd124c329352288b7b9da09e766b0668116862"
-dependencies = [
- "lexical-util",
- "lexical-write-integer",
- "static_assertions",
-]
-
-[[package]]
-name = "lexical-write-integer"
-version = "0.8.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e1b6f3d1f4422866b68192d62f77bc5c700bee84f3069f2469d7bc8c77852446"
-dependencies = [
- "lexical-util",
- "static_assertions",
-]
-
 [[package]]
 name = "libc"
 version = "0.2.152"
@@ -462,16 +345,6 @@ version = "2.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "523dc4f511e55ab87b694dc30d0f820d60906ef06413f93d4d7a1385599cc149"

-[[package]]
-name = "memmap"
-version = "0.7.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6585fd95e7bb50d6cc31e20d4cf9afb4e2ba16c5846fc76793f11218da9c475b"
-dependencies = [
- "libc",
- "winapi",
-]
-
 [[package]]
 name = "memmap2"
 version = "0.9.5"
@@ -703,26 +576,6 @@ dependencies = [
 "pest_derive",
 ]

-[[package]]
-name = "ref-cast"
-version = "1.0.22"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c4846d4c50d1721b1a3bef8af76924eef20d5e723647333798c1b519b3a9473f"
-dependencies = [
- "ref-cast-impl",
-]
-
-[[package]]
-name = "ref-cast-impl"
-version = "1.0.22"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5fddb4f8d99b0a2ebafc65a87a69a7b9875e4b1ae1f00db265d300ef7f28bccc"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.48",
-]
-
 [[package]]
 name = "rusttype"
 version = "0.9.3"
@@ -774,17 +627,6 @@ dependencies = [
 "syn 2.0.48",
 ]

-[[package]]
-name = "serde_json"
-version = "1.0.113"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "69801b70b1c3dac963ecb03a364ba0ceda9cf60c71cfe475e99864759c8b8a79"
-dependencies = [
- "itoa",
- "ryu",
- "serde",
-]
-
 [[package]]
 name = "serde_yaml"
 version = "0.9.31"
@@ -809,34 +651,6 @@ dependencies = [
 "digest",
 ]

-[[package]]
-name = "shlex"
-version = "1.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0fda2ff0d084019ba4d7c6f371c95d8fd75ce3524c3cb8fb653a3023f6323e64"
-
-[[package]]
-name = "simd-json"
-version = "0.13.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2faf8f101b9bc484337a6a6b0409cf76c139f2fb70a9e3aee6b6774be7bfbf76"
-dependencies = [
- "getrandom",
- "halfbrown",
- "lexical-core",
- "ref-cast",
- "serde",
- "serde_json",
- "simdutf8",
- "value-trait",
-]
-
-[[package]]
-name = "simdutf8"
-version = "0.1.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f27f6278552951f1f2b8cf9da965d10969b2efdea95a6ec47987ab46edfe263a"
-
 [[package]]
 name = "slotmap"
 version = "1.0.7"
@@ -852,12 +666,6 @@ version = "1.13.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e6ecd384b10a64542d77071bd64bd7b231f4ed5940fba55e98c3de13824cf3d7"

-[[package]]
-name = "static_assertions"
-version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
-
 [[package]]
 name = "syn"
 version = "1.0.109"
@@ -946,18 +754,6 @@ version = "0.2.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ab4c90930b95a82d00dc9e9ac071b4991924390d46cbd0dfe566148667605e4b"

-[[package]]
-name = "value-trait"
-version = "0.8.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dad8db98c1e677797df21ba03fca7d3bf9bec3ca38db930954e4fe6e1ea27eb4"
-dependencies = [
- "float-cmp",
- "halfbrown",
- "itoa",
- "ryu",
-]
-
 [[package]]
 name = "vec_map"
 version = "0.8.2"
@@ -980,12 +776,6 @@ dependencies = [
 "winapi-util",
 ]

-[[package]]
-name = "wasi"
-version = "0.11.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
-
 [[package]]
 name = "wasm-bindgen"
 version = "0.2.90"
@@ -1280,8 +1070,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dff9641d1cd4be8d1a070daf9e3773c5f67e78b4d9d42263020c057706765c04"

 [[package]]
-name = "wldash2"
-version = "0.1.0"
+name = "wldash"
+version = "0.4.3"
 dependencies = [
 "calloop",
 "chrono",
@@ -1289,14 +1079,12 @@ dependencies = [
 "fontconfig",
 "fuzzy-matcher",
 "libpulse-binding",
- "memmap",
+ "memmap2",
 "nix 0.26.4",
 "rcalc_lib",
 "rusttype",
 "serde",
 "serde_yaml",
- "shlex",
- "simd-json",
 "unicode-segmentation",
 "walkdir",
 "wayland-client",
@@ -1333,23 +1121,3 @@ dependencies = [
 "once_cell",
 "pkg-config",
 ]
-
-[[package]]
-name = "zerocopy"
-version = "0.7.32"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74d4d3961e53fa4c9a25a8637fc2bfaf2595b3d3ae34875568a5cf64787716be"
-dependencies = [
- "zerocopy-derive",
-]
-
-[[package]]
-name = "zerocopy-derive"
-version = "0.7.32"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9ce1b18ccd8e73a9321186f97e46f9f04b778851177567b1975109d26a08d2a6"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.48",
-]
@@ -1,19 +1,22 @@
 [package]
-name = "wldash2"
-version = "0.1.0"
-edition = "2021"
+name = "wldash"
+version = "0.4.3"
+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
-memmap = "0.7"
+memmap2 = "0.9"
 fontconfig = { version = "0.8.0", optional = true }
 rusttype = "0.9"
 # fontdue = "0.7"
@@ -24,7 +27,6 @@ walkdir = "2.4"

 unicode-segmentation = "1.10"
 fuzzy-matcher = "0.3"
-shlex = "1.3"

 xkbcommon = { version = "0.8", features = ["wayland"] }

@@ -36,5 +38,4 @@ libpulse-binding = "2.28"

 serde = { version = "1.0", features = ["derive"] }
 serde_yaml = "0.9"
-simd-json = "0.13"

@@ -0,0 +1,674 @@
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+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (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>.
@@ -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=0.4.3
+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/$pkgname/LICENSE"
+}
@@ -0,0 +1,95 @@
+# wldash
+
+![screenshot](https://git.sr.ht/~kennylevinsen/wldash/blob/master/assets/screenshot.jpg)
+
+A dashboard/launcher/control-panel thing for Wayland. Requires wlr-layer-shell-unstable-v1.
+
+Consider this alpha-quality: While it works, *everything* is subject to change with a moments notice. You may end up pulling in the latest changes, and *poof*, wldash suddenly turns into an artisan espresso machine.
+
+## Rewrite note
+
+wldash has received a significant rewrite. The old version is available in the wldash1 branch for now.
+
+## This fork
+
+This is a maintained fork of [kennylevinsen/wldash](https://github.com/kennylevinsen/wldash)
+living at <https://project.uhhm.no/bl/wldash>. On top of upstream it fixes a number of
+crashes (non-ASCII input in the launcher, machines without a backlight, battery or
+PulseAudio, key-repeat rate 0, ...), corrects redraw damage tracking, and prefers a
+machine-local `/etc/wldash/config.yml` over the per-user config when present, which keeps
+per-host layouts apart on NFS-shared homes.
+
+## How to use
+
+1. Checkout: `git clone https://project.uhhm.no/bl/wldash`
+2. Build: `cargo build --release`
+3. Put somewhere: `cp target/release/wldash /usr/local/bin/wldash`
+4. Run: `wldash`
+
+To generate a new default configuration, run `wldash --write-default-config`. To configure, edit `$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.
+
+Fonts are named (`sans`, `monospace`, or any fontconfig name) and resolved through fontconfig on the machine wldash runs on. `font_paths` in the config can pin a name to a file; if that file does not exist on the current machine, wldash says so on stderr and falls back to fontconfig rather than failing, so one config can roam between hosts with different font package layouts.
+
+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
+
+## Releasing
+
+Releases are cut with [cargo-release](https://github.com/crate-ci/cargo-release) (`cargo install cargo-release`), configured in `release.toml`. Put a line for each change under `## Unreleased` in `CHANGELOG.md` as you go, then on a clean `master`:
+
+```
+cargo release patch            # dry run: shows the bump, replacements and tag
+cargo release patch --execute  # do it (minor/major or an explicit version also work)
+```
+
+This bumps `Cargo.toml`, `Cargo.lock` and `PKGBUILD` to the same version, stamps the changelog section with the version and date, commits as `release X.Y.Z`, tags `vX.Y.Z` and pushes commit and tag to the `gitea` remote. The tag triggers `.gitea/workflows/release.yml`, which builds the package per architecture and uploads it to the `[uhhm]` registry. The workflow refuses a tag whose version disagrees with `PKGBUILD` or `Cargo.toml`, which cannot happen when the tag comes from cargo-release.
+
+## 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).
@@ -0,0 +1,26 @@
+# cargo-release settings. Cut a release with
+#
+#     cargo release patch          # dry run, shows what would change
+#     cargo release patch --execute
+#
+# (or `minor`, `major`, or an explicit version). It bumps Cargo.toml and
+# Cargo.lock, rewrites PKGBUILD's pkgver, turns the "## Unreleased"
+# section of CHANGELOG.md into "## X.Y.Z (date)", commits, tags
+# vX.Y.Z and pushes commit + tag to the gitea remote. That tag is what
+# .gitea/workflows/release.yml builds and uploads to the [uhhm] registry.
+
+# Not on crates.io; the package goes to the Arch registry via the tag.
+publish = false
+# `origin` is the upstream kennylevinsen fork on GitHub; releases go to
+# project.uhhm.no, and the workflow only runs there.
+push-remote = "gitea"
+allow-branch = ["master"]
+tag-name = "v{{version}}"
+tag-message = "wldash {{version}}"
+pre-release-commit-message = "release {{version}}"
+
+pre-release-replacements = [
+  { file = "PKGBUILD", search = "^pkgver=.*", replace = "pkgver={{version}}", exactly = 1 },
+  { file = "PKGBUILD", search = "^pkgrel=.*", replace = "pkgrel=1", exactly = 1 },
+  { file = "CHANGELOG.md", search = "^## Unreleased$", replace = "## {{version}} ({{date}})", exactly = 1 },
+]
@@ -1,5 +1,4 @@
 use std::{
-    ffi::CStr,
    fs::File,
    io,
    os::unix::io::{FromRawFd, RawFd},
@@ -16,11 +15,11 @@ use nix::{
    unistd,
 };

-use memmap::MmapMut;
+use memmap2::MmapMut;

 use wayland_client::{
-    protocol::{wl_buffer, wl_shm, wl_shm_pool},
    Dispatch, QueueHandle,
+    protocol::{wl_buffer, wl_shm, wl_shm_pool},
 };

 use crate::color::Color;
@@ -30,10 +29,7 @@ fn create_shm_fd() -> io::Result<RawFd> {
    // Only try memfd on linux
    #[cfg(target_os = "linux")]
    loop {
-        match memfd::memfd_create(
-            CStr::from_bytes_with_nul(b"wldash\0").unwrap(),
-            memfd::MemFdCreateFlag::MFD_CLOEXEC,
-        ) {
+        match memfd::memfd_create(c"wldash", memfd::MemFdCreateFlag::MFD_CLOEXEC) {
            Ok(fd) => return Ok(fd),
            Err(Errno::EINTR) => continue,
            Err(Errno::ENOSYS) => break,
@@ -78,11 +74,13 @@ fn create_shm_fd() -> io::Result<RawFd> {
 }

 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 id: u32,
    pub last_damage: Vec<Geometry>,
 }

@@ -94,7 +92,6 @@ impl ShmBuffer {
        height: i32,
        stride: i32,
        format: wl_shm::Format,
-        id: u32,
    ) -> io::Result<ShmBuffer>
    where
        D: Dispatch<wl_shm_pool::WlShmPool, ()> + Dispatch<wl_buffer::WlBuffer, ()> + 'static,
@@ -102,16 +99,16 @@ impl ShmBuffer {
        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).unwrap() };
-        let buffer = pool.create_buffer(0, width, height, stride, format, &qh, ());
+        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,
-            id,
            last_damage: Vec::new(),
        })
    }
@@ -121,37 +118,33 @@ impl ShmBuffer {
    }

    pub fn release(&mut self) {
-        self.refcnt -= 1;
+        // 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>,
-    pub next_id: u32,
 }

 impl BufferManager {
    pub fn new() -> BufferManager {
        BufferManager {
            buffers: Vec::new(),
-            next_id: 0,
        }
    }

    pub fn clear_buffers(&mut self) {
        for buf in self.buffers.iter_mut() {
-            buf.buffer.destroy()
+            buf.buffer.destroy();
+            buf.pool.destroy();
        }
        self.buffers.clear()
    }

    pub fn next_buffer(&mut self) -> Option<&mut ShmBuffer> {
-        for buf in self.buffers.iter_mut() {
-            if buf.refcnt == 0 {
-                return Some(buf);
-            }
-        }
-        None
+        self.buffers.iter_mut().find(|buf| buf.refcnt == 0)
    }

    pub fn add_buffer<D>(
@@ -162,18 +155,15 @@ impl BufferManager {
    ) where
        D: Dispatch<wl_shm_pool::WlShmPool, ()> + Dispatch<wl_buffer::WlBuffer, ()> + 'static,
    {
-        let mut buf = ShmBuffer::new(
+        let buf = ShmBuffer::new(
            wl_shm,
            qh,
            dimensions.0,
            dimensions.1,
            dimensions.0 * 4,
            wl_shm::Format::Argb8888,
-            self.next_id,
        )
        .expect("unable to add buffer");
-        self.next_id += 1;
-        BufferView::new(&mut buf.mmap, (dimensions.0 as u32, dimensions.1 as u32));
        self.buffers.push(buf);
    }
 }
@@ -185,7 +175,7 @@ pub struct BufferView<'a> {
 }

 impl<'a> BufferView<'a> {
-    pub fn new(buf: &'a mut MmapMut, dimensions: (u32, u32)) -> BufferView {
+    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,
@@ -208,7 +198,7 @@ impl<'a> BufferView<'a> {
        }
    }

-    pub fn subdimensions(&mut self, subdimensions: (u32, u32, u32, u32)) -> BufferView {
+    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
@@ -232,11 +222,11 @@ impl<'a> BufferView<'a> {
        }
    }

-    pub fn subgeometry(&mut self, geo: Geometry) -> BufferView {
+    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 {
+    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!(
@@ -6,7 +6,7 @@ use std::sync::{Arc, Mutex};

 use crate::{
    event::Events,
-    fonts::{find_font, FontMap},
+    fonts::FontMap,
    widgets::{
        Backlight, Battery, Calendar, Clock, Date, HorizontalLayout, IndexedLayout, Interface,
        InvertedHorizontalLayout, InvertedVerticalLayout, Layout, Line, Margin, PulseAudio,
@@ -89,8 +89,6 @@ 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 {
@@ -154,14 +152,13 @@ impl Config {
            ])),
        };

-        let map = HashMap::from([
-            ("sans".to_string(), sans),
-            ("monospace".to_string(), monospace),
-        ]);
-
        Config {
-            font_paths: Some(map),
-            widget: widget,
+            // Left unset on purpose: "sans"/"monospace" are resolved through
+            // fontconfig on each machine at start. Pinning absolute paths
+            // here broke configs shared between hosts with different font
+            // package layouts. Set font_paths yourself to override.
+            font_paths: None,
+            widget,
            mode: OperationMode::LayerSurface((1024, 768)),
            background: Some(0xFAFAFAFA),
            server: None,
@@ -171,8 +168,6 @@ impl Config {
    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 {
@@ -244,14 +239,13 @@ impl Config {
            ]),
        ]);

-        let map = HashMap::from([
-            ("sans".to_string(), sans),
-            ("monospace".to_string(), monospace),
-        ]);
-
        Config {
-            font_paths: Some(map),
-            widget: widget,
+            // Left unset on purpose: "sans"/"monospace" are resolved through
+            // fontconfig on each machine at start. Pinning absolute paths
+            // here broke configs shared between hosts with different font
+            // package layouts. Set font_paths yourself to override.
+            font_paths: None,
+            widget,
            mode: if clay {
                OperationMode::XdgToplevel
            } else {
@@ -281,7 +275,7 @@ impl Widget {
    pub fn construct_widgets(
        self,
        v: &mut Vec<Box<dyn RealWidget>>,
-        mut fm: &mut FontMap,
+        fm: &mut FontMap,
        events: &Arc<Mutex<Events>>,
    ) {
        match self {
@@ -301,12 +295,12 @@ impl Widget {
            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(
-                &mut fm,
+                fm,
                leak_or_default(font, "sans"),
                font_size,
            ))),
            Widget::Date { font, font_size } => v.push(Box::new(Date::new(
-                &mut fm,
+                fm,
                leak_or_default(font, "sans"),
                font_size,
            ))),
@@ -317,7 +311,7 @@ impl Widget {
                sections_x,
                sections_y,
            } => v.push(Box::new(Calendar::new(
-                &mut fm,
+                fm,
                leak_or_default(font_primary, "monospace"),
                leak_or_default(font_secondary, "sans"),
                font_size,
@@ -330,14 +324,14 @@ impl Widget {
                launch_cmd,
            } => v.push(Box::new(Interface::new(
                events.clone(),
-                &mut fm,
+                fm,
                leak_or_default(font, "sans"),
                font_size,
                launch_cmd,
            ))),
            Widget::Battery { font, font_size } => v.push(Box::new(Battery::new(
                events.clone(),
-                &mut fm,
+                fm,
                leak_or_default(font, "sans"),
                font_size,
            ))),
@@ -347,13 +341,13 @@ impl Widget {
                font_size,
            } => v.push(Box::new(Backlight::new(
                leak_or_none(device),
-                &mut fm,
+                fm,
                leak_or_default(font, "sans"),
                font_size,
            ))),
            Widget::PulseAudio { font, font_size } => v.push(Box::new(PulseAudio::new(
                events.clone(),
-                &mut fm,
+                fm,
                Box::leak(font.unwrap_or_else(|| "sans".to_string()).into_boxed_str()),
                font_size,
            ))),
@@ -1,7 +1,7 @@
 use crate::buffer::BufferView;
 use crate::{color::Color, fonts::FontRef};

-use rusttype::{point, Scale};
+use rusttype::{Scale, point};
 use std::collections::HashMap;

 struct CachedGlyph {
@@ -82,7 +82,7 @@ pub struct Font<'a> {
 }

 impl<'a> Font<'a> {
-    pub fn new(font: FontRef<'a>, size: f32) -> Font {
+    pub fn new(font: FontRef<'a>, size: f32) -> Font<'a> {
        Font {
            glyphs: HashMap::new(),
            font,
@@ -98,7 +98,7 @@ impl<'a> Font<'a> {

    pub fn add_str_to_cache(&mut self, s: &str) {
        for ch in s.chars() {
-            if self.glyphs.get(&ch).is_none() {
+            if !self.glyphs.contains_key(&ch) {
                let glyph = CachedGlyph::new(self.font, self.size, ch);
                self.glyphs.insert(ch, glyph);
            }
@@ -118,10 +118,10 @@ impl<'a> Font<'a> {
            let glyph = match self.glyphs.get(&ch) {
                Some(glyph) => glyph,
                None => {
-                    return Err(::std::io::Error::new(
-                        ::std::io::ErrorKind::Other,
-                        format!("glyph for {:} not in cache", ch),
-                    ))
+                    return Err(::std::io::Error::other(format!(
+                        "glyph for {:} not in cache",
+                        ch
+                    )));
                }
            };
            glyphs.push(glyph);
@@ -151,10 +151,10 @@ impl<'a> Font<'a> {
            let glyph = match self.glyphs.get(&ch) {
                Some(glyph) => glyph,
                None => {
-                    return Err(::std::io::Error::new(
-                        ::std::io::ErrorKind::Other,
-                        format!("glyph for {:} not in cache", ch),
-                    ))
+                    return Err(::std::io::Error::other(format!(
+                        "glyph for {:} not in cache",
+                        ch
+                    )));
                }
            };
            glyphs.push(glyph);
@@ -203,10 +203,10 @@ impl<'a> Font<'a> {
            let glyph = match self.glyphs.get(&ch) {
                Some(glyph) => glyph,
                None => {
-                    return Err(::std::io::Error::new(
-                        ::std::io::ErrorKind::Other,
-                        format!("glyph for {:} not in cache", ch),
-                    ))
+                    return Err(::std::io::Error::other(format!(
+                        "glyph for {:} not in cache",
+                        ch
+                    )));
                }
            };
            let width = glyph.advance;
@@ -252,10 +252,10 @@ impl<'a> Font<'a> {
            let glyph = match self.glyphs.get(&ch) {
                Some(glyph) => glyph,
                None => {
-                    return Err(::std::io::Error::new(
-                        ::std::io::ErrorKind::Other,
-                        format!("glyph for {:} not in cache", ch),
-                    ))
+                    return Err(::std::io::Error::other(format!(
+                        "glyph for {:} not in cache",
+                        ch
+                    )));
                }
            };
            glyphs.push(glyph);
@@ -284,10 +284,10 @@ impl<'a> Font<'a> {
            let glyph = match self.glyphs.get(&ch) {
                Some(glyph) => glyph,
                None => {
-                    return Err(::std::io::Error::new(
-                        ::std::io::ErrorKind::Other,
-                        format!("glyph for {:} not in cache", ch),
-                    ))
+                    return Err(::std::io::Error::other(format!(
+                        "glyph for {:} not in cache",
+                        ch
+                    )));
                }
            };
            glyphs.push(glyph);
@@ -56,6 +56,6 @@ impl Events {

    pub fn flush(&mut self) -> Vec<Event> {
        self.dirty = false;
-        self.events.drain(..).collect()
+        std::mem::take(&mut self.events)
    }
 }
@@ -9,21 +9,48 @@ use std::{
 /// FontRef is used to store Fonts on widgets.
 pub type FontRef<'a> = &'a rusttype::Font<'a>;

+/// Ask fontconfig for the file backing a font name ("sans", "monospace",
+/// "Noto Sans", ...), the way fc-match does.
 #[cfg(feature = "fontconfig")]
-pub(crate) fn find_font(name: &str) -> String {
+pub(crate) fn find_font(name: &str) -> Result<String, String> {
    use fontconfig::Fontconfig as FontConfig;
-    let fc = FontConfig::new().unwrap();
-    fc.find(name, None)
-        .unwrap()
+    let fc = FontConfig::new().ok_or("could not initialise fontconfig")?;
+    let found = fc
+        .find(name, None)
+        .ok_or_else(|| format!("fontconfig has no match for {:?}", name))?;
+    found
        .path
        .to_str()
-        .unwrap()
-        .to_string()
+        .map(|s| s.to_string())
+        .ok_or_else(|| format!("font path for {:?} is not UTF-8", name))
 }

 #[cfg(not(feature = "fontconfig"))]
-pub(crate) fn find_font(_name: &str) -> String {
-    panic!("fontconfig not enabled so font search not available");
+pub(crate) fn find_font(name: &str) -> Result<String, String> {
+    Err(format!(
+        "no path configured for font {:?} and wldash was built without fontconfig",
+        name
+    ))
+}
+
+/// Resolve the file to load for `name`: a path pinned in the config if it
+/// exists on this machine, otherwise whatever fontconfig picks for the name.
+///
+/// Configs roam between machines on a shared home, and font packages do
+/// not keep the same file layout everywhere (Noto under fonts/noto on one
+/// distribution, fonts/google-noto on another), so a pinned path that is
+/// missing is a reason to fall back, not to abort.
+pub(crate) fn resolve_font_path(name: &str, pinned: Option<&str>) -> Result<String, String> {
+    if let Some(p) = pinned {
+        if Path::new(p).is_file() {
+            return Ok(p.to_string());
+        }
+        eprintln!(
+            "wldash: configured font file for {:?} not found: {}; asking fontconfig instead",
+            name, p
+        );
+    }
+    find_font(name)
 }

 /// FontLoader is a marker struct that is used to load files
@@ -31,17 +58,20 @@ 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>>
+    pub(crate) fn from_path<'a, P>(path: P) -> Result<Font<'a>, String>
    where
        P: AsRef<Path>,
    {
-        let mut file = File::open(path).expect("Font file not found");
+        let path = path.as_ref();
+        let mut file =
+            File::open(path).map_err(|e| format!("cannot open {}: {}", path.display(), e))?;
        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)
+        file.read_to_end(&mut data)
+            .map_err(|e| format!("cannot read {}: {}", path.display(), e))?;
+        Font::try_from_vec(data).ok_or_else(|| format!("{} is not a usable font", path.display()))
    }
 }

@@ -70,10 +100,13 @@ impl PartialEq for ComparableF32 {

 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: HashMap<&'static str, (&'static str, Vec<(f32, &'static str)>)>,
+    required_fonts: RequiredFonts,
 }

 impl FontMap {
@@ -99,19 +132,28 @@ impl FontMap {
        self.font_paths.insert(font_name, font_path);
    }

+    /// Load every queued font. Runs on its own thread; a font that cannot
+    /// be found or read is a configuration problem the user has to see, so
+    /// it is reported in one line and the process exits instead of
+    /// aborting with a panic backtrace.
    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 pinned = self.font_paths.get(font_name).map(|s| s.as_str());
+            let path = match resolve_font_path(font_name, pinned) {
+                Ok(p) => p,
+                Err(e) => {
+                    eprintln!("wldash: cannot resolve font {:?}: {}", font_name, e);
+                    std::process::exit(1);
                }
            };
-            let fontref = Box::leak(Box::new(
-                FontLoader::from_path(path).expect("unable to load font"),
-            ));
+            let font = match FontLoader::from_path(&path) {
+                Ok(f) => f,
+                Err(e) => {
+                    eprintln!("wldash: cannot load font {:?}: {}", font_name, e);
+                    std::process::exit(1);
+                }
+            };
+            let fontref = Box::leak(Box::new(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);
@@ -157,3 +199,27 @@ impl MaybeFontMap {
        }
    }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::resolve_font_path;
+
+    #[test]
+    fn pinned_path_wins_when_present() {
+        let dir = std::env::temp_dir().join(format!("wldash-font-test-{}", std::process::id()));
+        std::fs::create_dir_all(&dir).unwrap();
+        let f = dir.join("x.ttf");
+        std::fs::write(&f, b"not really a font").unwrap();
+        let p = f.to_str().unwrap();
+        assert_eq!(resolve_font_path("sans", Some(p)).unwrap(), p);
+        std::fs::remove_dir_all(&dir).unwrap();
+    }
+
+    #[test]
+    fn missing_pinned_path_falls_back_to_lookup() {
+        // Whatever fontconfig answers (or an error without fontconfig),
+        // the missing pinned path itself must never be returned.
+        let r = resolve_font_path("sans", Some("/nonexistent/wldash/font.ttf"));
+        assert_ne!(r.as_deref().ok(), Some("/nonexistent/wldash/font.ttf"));
+    }
+}
@@ -12,12 +12,9 @@
 //! 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::{AsRawFd, OwnedFd},
-};
+use std::{default::Default, os::unix::io::OwnedFd};

-use wayland_client::{protocol::wl_keyboard, WEnum};
+use wayland_client::{WEnum, protocol::wl_keyboard};
 use xkbcommon::xkb;

 pub use xkbcommon::xkb::keysyms;
@@ -31,6 +28,7 @@ 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>,
@@ -46,7 +44,7 @@ pub struct KeymapDescription {

 impl KeymapDescription {
    fn new(fd: OwnedFd, size: u32) -> KeymapDescription {
-        KeymapDescription { fd: fd, size: size }
+        KeymapDescription { fd, size }
    }
 }

@@ -77,7 +75,9 @@ impl Keyboard {
            WEnum::Value(wl_keyboard::KeymapFormat::NoKeymap) => {
                // TODO: how to handle this (hopefully never occuring) case?
            }
-            _ => unreachable!(),
+            // Unknown format from a newer protocol version: ignore rather than
+            // abort the whole process.
+            _ => (),
        }
    }

@@ -1,11 +1,11 @@
 use std::time::Duration;

 use calloop::{
+    EventSource, Poll, PostAction, Readiness, Token, TokenFactory,
    channel::{self, Channel},
    timer::{TimeoutAction, Timer},
-    EventSource, Poll, PostAction, Readiness, Token, TokenFactory,
 };
-use wayland_client::{protocol::wl_keyboard, WEnum};
+use wayland_client::{WEnum, protocol::wl_keyboard};

 use super::KeyEvent;

@@ -89,6 +89,12 @@ impl EventSource for KeyRepeatSource {
                        _ => (),
                    },
                    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;
@@ -96,6 +102,7 @@ impl EventSource for KeyRepeatSource {
                                timer.set_deadline(now + *delay);
                            }
                        }
+                    }
                },

                channel::Event::Closed => {
@@ -129,7 +136,9 @@ impl EventSource for KeyRepeatSource {
            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");
+                println!(
+                    "KeyRepeatSource::process_events: More than two repeat cycles behind, resetting"
+                );
                next_deadline = now + *rate;
            } else {
                while next_deadline < now {
@@ -81,17 +81,15 @@ impl KbState {
    }

    pub(crate) fn compose_feed(&mut self, keysym: u32) -> Option<xkb::compose::FeedResult> {
-        match &mut self.xkb_compose_state {
-            Some(compose_state) => Some(compose_state.feed(xkb::Keysym::new(keysym))),
-            None => None,
-        }
+        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> {
-        match &mut self.xkb_compose_state {
-            Some(compose_state) => Some(compose_state.status()),
-            None => None,
-        }
+        self.xkb_compose_state
+            .as_mut()
+            .map(|compose_state| compose_state.status())
    }

    pub(crate) fn compose_get_utf8(&mut self) -> Option<String> {
@@ -130,11 +128,11 @@ impl KbState {

    pub(crate) fn init_compose(&mut self) {
        let locale = env::var_os("LC_ALL")
-            .and_then(|v| if v.is_empty() { None } else { Some(v) })
+            .filter(|v| !v.is_empty())
            .or_else(|| env::var_os("LC_CTYPE"))
-            .and_then(|v| if v.is_empty() { None } else { Some(v) })
+            .filter(|v| !v.is_empty())
            .or_else(|| env::var_os("LANG"))
-            .and_then(|v| if v.is_empty() { None } else { Some(v) })
+            .filter(|v| !v.is_empty())
            .unwrap_or_else(|| "C".into());

        let compose_table = match xkb::compose::Table::new_from_locale(
@@ -12,8 +12,8 @@ mod widgets;
 use wayland_client::{Connection, QueueHandle, WaylandSource};

 use calloop::{
-    timer::{TimeoutAction, Timer},
    EventLoop,
+    timer::{TimeoutAction, Timer},
 };
 use chrono::{Duration, Local, Timelike};

@@ -23,17 +23,15 @@ use event::{Event, Events};
 use fonts::{FontMap, MaybeFontMap};
 use keyboard::{KeyRepeatSource, RepeatMessage};
 use state::State;
-use utils::{
-    desktop::{load_desktop_files, write_desktop_cache},
-    xdg,
-};
+use utils::xdg;
 use widgets::{Geometry, Widget};

 use std::{
-    env,
+    env, fs,
    fs::File,
    io::{BufRead, BufReader, Write},
    os::unix::net::{UnixListener, UnixStream},
+    path::Path,
    rc::Rc,
    thread,
 };
@@ -45,26 +43,58 @@ usage: wldash [OPTIONS]

 OPTIONS:
  --config CONFIG_FILE                     use the specified config file
-                                           (~/.config/wldash/config.yml by default)
+                                           (/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                        refresh desktop file cache
+  --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();

-    let mut config_file = format!("{}/wldash/config.yml", xdg::config_folder());
+    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 => panic!("missing argument to --config"),
+                None => die("missing argument to --config".to_string()),
            },
            Some(ref s) if s == "--write-default-config" => {
                let config = match args.next() {
@@ -72,17 +102,20 @@ fn main() {
                    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) => panic!("unknown argument: {}", s),
+                    Some(s) => die(format!("unknown argument to --write-default-config: {}", s)),
                };
-                match File::create(config_file) {
-                    Ok(f) => serde_yaml::to_writer(f, &config).unwrap(),
-                    Err(_) => panic!("uh"),
+                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" => {
-                let v = load_desktop_files();
-                write_desktop_cache(&v).unwrap();
+                eprintln!("wldash: desktop files are scanned at every start; nothing to refresh");
                std::process::exit(0);
            }
            Some(ref s) if s == "--help" => {
@@ -97,7 +130,10 @@ fn main() {
        }
    }

-    let conn = Connection::connect_to_env().unwrap();
+    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();
@@ -116,7 +152,7 @@ fn main() {
    handle
        .insert_source(
            WaylandSource::new(event_queue).expect("Could not create WaylandSource!"),
-            |_event, queue, mut state| queue.dispatch_pending(&mut state),
+            |_event, queue, state| queue.dispatch_pending(state),
        )
        .expect("Failed to insert event source!");

@@ -173,9 +209,15 @@ fn main() {

    let mut fm = FontMap::new();

-    let config: Config = match File::open(config_file) {
-        Ok(f) => serde_yaml::from_reader(f).unwrap(),
-        Err(_) => panic!("configuration file missing"),
+    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 {
@@ -190,8 +232,7 @@ fn main() {
            .spawn(move || {
                let listener = UnixListener::bind(socket_path.clone()).unwrap();
                loop {
-                    match listener.accept() {
-                        Ok((stream, _)) => {
+                    if let Ok((stream, _)) = listener.accept() {
                        let _ = thread::Builder::new().name("ipc_client".to_string()).spawn(
                            move || {
                                let r = BufReader::new(stream);
@@ -206,8 +247,6 @@ fn main() {
                            },
                        );
                    }
-                        _ => (),
-                    }
                }
            });
    }
@@ -261,7 +300,7 @@ fn main() {
        }

        let mut force = false;
-        if state.bufmgr.buffers.len() == 0 {
+        if state.bufmgr.buffers.is_empty() {
            state.add_buffer(&qhandle);
            force = true;
        }
@@ -285,7 +324,7 @@ fn main() {
            }
        };

-        if buf.last_damage.len() == 0 {
+        if buf.last_damage.is_empty() {
            for _ in 0..state.widgets.len() {
                buf.last_damage.push(Geometry::new());
            }
@@ -7,11 +7,11 @@ use std::{
 };

 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,
    },
-    Connection, Dispatch, QueueHandle, WEnum,
 };

 use wayland_protocols::{
@@ -133,17 +133,16 @@ impl State {
            Ok(token) => token,
            Err(_) => return,
        };
-        match (
+        if let (Some(surface), Some(activation)) = (
            &self.main_surface.wl_surface,
            &self.protocols.xdg_activation,
        ) {
-            (Some(surface), Some(activation)) => {
            activation.activate(key, surface);
            let activation_token = activation.get_activation_token(qh, ());
            activation_token.commit();
+            unsafe {
                env::remove_var("XDG_ACTIVATION_TOKEN");
            }
-            _ => (),
        }
    }
 }
@@ -331,9 +330,8 @@ impl Dispatch<wl_callback::WlCallback, ()> for State {
        _: &Connection,
        _: &QueueHandle<Self>,
    ) {
-        match event {
-            wl_callback::Event::Done { callback_data: _ } => state.ready = true,
-            _ => {}
+        if let wl_callback::Event::Done { callback_data: _ } = event {
+            state.ready = true
        }
    }
 }
@@ -461,12 +459,15 @@ impl Dispatch<zwlr_layer_surface_v1::ZwlrLayerSurfaceV1, ()> for State {
                    (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);

-                if state.configured && state.dimensions == dim {
+                // 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();
@@ -478,8 +479,8 @@ impl Dispatch<zwlr_layer_surface_v1::ZwlrLayerSurfaceV1, ()> for State {
                    &Geometry {
                        x: 0,
                        y: 0,
-                        width: width as u32,
-                        height: height as u32,
+                        width,
+                        height,
                    },
                    state,
                );
@@ -656,25 +657,27 @@ impl Dispatch<wl_keyboard::WlKeyboard, ()> for State {
                state: kbstate,
                ..
            } => {
-                if key == 1 {
-                    state.running = false;
-                    return;
-                }
                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);
                }
-                if repeats {
-                    if let Event::KeyEvent(k) = 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 {
@@ -733,8 +736,8 @@ impl Dispatch<wl_pointer::WlPointer, ()> for State {
                state.pointer = Some((surface_x, surface_y));
            }
            wl_pointer::Event::Leave { .. } => state.pointer = None,
-            wl_pointer::Event::Axis { axis, value, .. } => match state.pointer {
-                Some((x, y)) => {
+            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)
@@ -749,24 +752,22 @@ impl Dispatch<wl_pointer::WlPointer, ()> for State {
                        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: pos,
-                            });
+                            let ev = Event::PointerEvent(PointerEvent { button: axis, pos });
                            widget.event(&ev);
                            state.dirty = true;
                            break;
                        }
                    }
                }
-                _ => (),
-            },
+            }
            wl_pointer::Event::Button {
                button,
                state: button_state,
                ..
-            } => match (button, button_state, state.pointer) {
-                (button, WEnum::Value(wl_pointer::ButtonState::Pressed), Some((x, y))) => {
+            } => {
+                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,
@@ -778,18 +779,14 @@ impl Dispatch<wl_pointer::WlPointer, ()> for State {
                        let geo = widget.geometry();
                        if geo.contains(pos) {
                            let pos = (pos.0 - geo.x, pos.1 - geo.y);
-                            let ev = Event::PointerEvent(PointerEvent {
-                                button: button,
-                                pos: pos,
-                            });
+                            let ev = Event::PointerEvent(PointerEvent { button, pos });
                            widget.event(&ev);
                            state.dirty = true;
                            break;
                        }
                    }
                }
-                _ => (),
-            },
+            }
            _ => (),
        }
    }
@@ -852,14 +849,11 @@ impl Dispatch<xdg_activation_token_v1::XdgActivationTokenV1, ()> for State {
        _: &Connection,
        _: &QueueHandle<Self>,
    ) {
-        match event {
-            xdg_activation_token_v1::Event::Done { token } => {
+        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);
            }
        }
-            _ => (),
-        }
    }
 }
@@ -2,18 +2,17 @@ use std::{
    cmp::Ordering,
    collections::HashSet,
    error::Error,
-    fs::{read_to_string, File},
+    fs::read_to_string,
+    hash::{Hash, Hasher},
    io::{Error as io_error, ErrorKind},
+    path::Path,
 };

-use serde::{self, Deserialize, Serialize};
-use simd_json;
 use walkdir::WalkDir;

 use crate::utils::{inish, xdg};

-#[derive(Serialize, Deserialize, Clone, Debug, Eq, Hash)]
-#[serde(rename_all = "snake_case")]
+#[derive(Clone, Debug, Eq)]
 pub struct Desktop {
    pub entry_type: String,
    pub name: String,
@@ -26,7 +25,7 @@ pub struct Desktop {
 }

 impl Desktop {
-    fn parse(f: &str) -> Result<Desktop, Box<dyn Error>> {
+    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") {
@@ -43,10 +42,10 @@ impl Desktop {
                    .map(|x| {
                        x.split(';')
                            .map(|y| y.trim().to_string())
-                            .filter(|z| z != "")
+                            .filter(|z| !z.is_empty())
                            .collect()
                    })
-                    .unwrap_or_else(|| vec![]),
+                    .unwrap_or_else(std::vec::Vec::new),
            }),
            None => Err(Box::new(io_error::new(
                ErrorKind::NotFound,
@@ -74,20 +73,20 @@ impl PartialEq for Desktop {
    }
 }

-pub fn load_desktop_cache() -> Result<Vec<Desktop>, Box<dyn Error>> {
-    match File::open(format!("{}/wldash/desktop.json", xdg::cache_folder())) {
-        Ok(f) => simd_json::from_reader(f).map_err(|e| e.into()),
-        Err(e) => Err(e.into()),
-    }
-}
-
-pub fn write_desktop_cache(v: &Vec<Desktop>) -> Result<(), Box<dyn Error>> {
-    match File::create(format!("{}/wldash/desktop.json", xdg::cache_folder())) {
-        Ok(f) => simd_json::to_writer(f, v).map_err(|e| e.into()),
-        Err(e) => Err(e.into()),
+// 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();

@@ -95,9 +94,18 @@ pub fn load_desktop_files() -> Vec<Desktop> {
    let mut seen: HashSet<String> = HashSet::new();

    for dir in dirs {
-        for entry in WalkDir::new(format!("{}/applications", dir)) {
-            if let Ok(entry) = entry {
-                if let Ok(d) = Desktop::parse(entry.path().to_str().unwrap()) {
+        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")
@@ -1,6 +1,6 @@
 use std::{collections::HashMap, error::Error};

-fn parse_field<'a>(line: &'a str) -> Result<(&'a str, &'a str), Box<dyn 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()),
@@ -30,8 +30,8 @@ pub fn parse<'a>(s: &'a str) -> Result<Inish<'a>, Box<dyn Error>> {
            (Some('['), Some(']')) => {
                sections.insert(current_section_name, current_section);
                current_section = HashMap::new();
-                let len = line.bytes().count();
-                current_section_name = &line[1..len - 1].trim();
+                let len = line.len();
+                current_section_name = line[1..len - 1].trim();
            }
            (Some('['), v) => {
                return Err(format!(
@@ -10,6 +10,18 @@ pub fn cache_folder() -> String {
    }
 }

+/// 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(),
@@ -1,6 +1,6 @@
 use std::{
    fs::{self, OpenOptions},
-    io::{Error, ErrorKind, Write},
+    io::{Error, Write},
    path::{Path, PathBuf},
 };

@@ -17,7 +17,7 @@ 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::new(ErrorKind::Other, "unable to parse value"))
+        .map_err(|_e| Error::other("unable to parse value"))
 }

 fn write_file_as_u64(path: &Path, value: u64) -> Result<(), Error> {
@@ -26,31 +26,69 @@ fn write_file_as_u64(path: &Path, value: u64) -> Result<(), Error> {
 }

 pub struct Backlight {
-    device_path: PathBuf,
+    /// `None` when no backlight exists on this machine: the widget then
+    /// renders empty and ignores clicks instead of taking wldash down.
+    /// Configs are shared between hosts, so a laptop config running on a
+    /// desktop must not panic here.
+    device_path: Option<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) {
-        self.cur = read_file_as_u64(self.device_path.join("brightness").as_path()).unwrap();
-        self.max = read_file_as_u64(self.device_path.join("max_brightness").as_path()).unwrap();
+        let Some(dev) = &self.device_path else {
+            return;
+        };
+        if let Ok(cur) = read_file_as_u64(dev.join("brightness").as_path()) {
+            self.cur = cur;
+        }
+        if let Ok(max) = read_file_as_u64(dev.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 mut device_path = None;
-        if let Some(path) = path {
-            device_path = Some(Path::new("/sys/class/backlight").to_path_buf().join(path));
+        let device_path = match path {
+            Some(path) => {
+                let p = Path::new("/sys/class/backlight").join(path);
+                if p.is_dir() {
+                    Some(p)
                } else {
-            for entry in WalkDir::new("/sys/class/backlight") {
-                if let Ok(entry) = entry {
-                    device_path = Some(entry.path().to_path_buf());
+                    eprintln!(
+                        "wldash: backlight device {:?} not found, widget disabled",
+                        p
+                    );
+                    None
                }
            }
+            None => {
+                let p = find_device();
+                if p.is_none() {
+                    eprintln!(
+                        "wldash: no backlight device under /sys/class/backlight, widget disabled"
+                    );
                }
+                p
+            }
+        };
        let mut dev = Backlight {
-            device_path: device_path.expect("did not find backlight device"),
+            device_path,
            cur: 0,
            max: 0,
            dirty: true,
@@ -61,18 +99,19 @@ impl Backlight {
    }

    pub fn detect() -> bool {
-        for entry in WalkDir::new("/sys/class/backlight") {
-            if entry.is_ok() {
-                return true;
-            }
-        }
-        return false;
+        find_device().is_some()
    }

    pub fn set(&mut self, brightness: f32) {
-        let val = (self.max as f32 * brightness) as u64;
-        let _ = write_file_as_u64(self.device_path.join("brightness").as_path(), val);
-        self.cur = read_file_as_u64(self.device_path.join("brightness").as_path()).unwrap();
+        let Some(dev) = &self.device_path else {
+            return;
+        };
+        let val = (self.max as f32 * brightness.clamp(0.0, 1.0)) as u64;
+        let brightness_path = dev.join("brightness");
+        let _ = write_file_as_u64(&brightness_path, val);
+        if let Ok(cur) = read_file_as_u64(&brightness_path) {
+            self.cur = cur;
+        }
    }
 }

@@ -84,12 +123,14 @@ impl BarWidgetImpl for Backlight {
        self.dirty
    }
    fn value(&mut self) -> f32 {
-        if self.cur > self.max {
-            // what.
+        self.dirty = false;
+        if self.device_path.is_none() {
+            return 0.0;
+        }
+        if self.max == 0 || self.cur > self.max {
+            // Sysfs handed us nonsense; show full rather than a bogus ratio.
            return 1.0;
        }
-
-        self.dirty = false;
        self.cur as f32 / self.max as f32
    }
    fn color(&self) -> Color {
@@ -97,9 +138,8 @@ impl BarWidgetImpl for Backlight {
    }
    fn click(&mut self, pos: f32, btn: PointerButton) {
        self.dirty = true;
-        match btn {
-            PointerButton::Left => self.set(pos),
-            _ => (),
+        if let PointerButton::Left = btn {
+            self.set(pos)
        };
    }
 }
@@ -62,21 +62,13 @@ impl Widget for BarWidget {
        let val = self.inner_widget.value();

        let c = self.inner_widget.color();
-        draw_bar(
-            &mut view.offset((bar_offset, 0)),
-            c,
-            self.geometry.width - bar_offset,
-            size,
-            val,
-        )
-        .unwrap();
+        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,
-            (self.geometry.width - bar_offset, size),
-        )
-        .unwrap();
+        draw_box(&mut view.offset((bar_offset, 0)), c, (bar_width, size)).unwrap();
        self.geometry
    }

@@ -87,7 +79,7 @@ impl Widget for BarWidget {
            x += geometry.width - w;
        }
        self.geometry = Geometry {
-            x: x,
+            x,
            y: geometry.y,
            width: w,
            height: self.size.ceil() as u32,
@@ -105,15 +97,12 @@ impl Widget for BarWidget {
    }

    fn event(&mut self, event: &Event) {
-        match event {
-            Event::PointerEvent(ev) => {
+        if let Event::PointerEvent(ev) = event {
            let offset = 4 * self.size.ceil() as u32;
-                if ev.pos.0 >= offset {
+            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);
            }
        }
-            _ => (),
-        }
    }
 }
@@ -6,8 +6,8 @@ use std::{
 };

 use dbus::blocking::{
-    stdintf::org_freedesktop_dbus::{Properties, PropertiesPropertiesChanged},
    LocalConnection,
+    stdintf::org_freedesktop_dbus::{Properties, PropertiesPropertiesChanged},
 };

 use crate::{
@@ -47,77 +47,87 @@ struct InnerBattery {
    dirty: bool,
 }

-fn get_battery_state() -> Result<UpowerBatteryState, Box<dyn Error>> {
+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 device_path = "/org/freedesktop/UPower/devices/DisplayDevice";
    let proxy = conn.with_proxy(
        "org.freedesktop.UPower",
-        device_path,
+        DEVICE_PATH,
        Duration::from_millis(500),
    );
-    let state: u32 = proxy.get("org.freedesktop.UPower.Device", "State")?;
-    Ok(UpowerBatteryState::from_dbus(state as u64))
+    let present: bool = proxy.get(DEVICE_IFACE, "IsPresent")?;
+    Ok(present)
 }

-fn start_monitor(inner: Arc<Mutex<InnerBattery>>, events: Arc<Mutex<Events>>) {
-    thread::Builder::new()
-        .name("battmon".to_string())
-        .spawn(move || {
-            let conn = LocalConnection::new_system().unwrap();
-            let device_path = "/org/freedesktop/UPower/devices/DisplayDevice";
+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,
+        DEVICE_PATH,
        Duration::from_millis(500),
    );

-            let capacity: f64 = proxy
-                .get("org.freedesktop.UPower.Device", "Percentage")
-                .expect("unable to get property");
-            let state: u32 = proxy
-                .get("org.freedesktop.UPower.Device", "State")
-                .expect("unable to get state");
+    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 != "org.freedesktop.UPower.Device" {
+    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" => {
-                                    inner.state =
-                                        UpowerBatteryState::from_dbus(value.0.as_u64().unwrap());
+                        if let Some(v) = value.0.as_u64() {
+                            inner.state = UpowerBatteryState::from_dbus(v);
                            inner.dirty = true;
-                                    let mut events = events.lock().unwrap();
-                                    events.add_event(Event::PowerUpdate);
+                            events.lock().unwrap().add_event(Event::PowerUpdate);
+                        }
                    }
                    "Percentage" => {
-                                    inner.value = value.0.as_f64().unwrap() as f32 / 100.;
+                        if let Some(v) = value.0.as_f64() {
+                            inner.value = v as f32 / 100.;
                            inner.dirty = true;
-                                    let mut events = events.lock().unwrap();
-                                    events.add_event(Event::PowerUpdate);
+                            events.lock().unwrap().add_event(Event::PowerUpdate);
+                        }
                    }
                    _ => (),
                }
            }
            true
        },
-                )
-                .unwrap();
+    )?;

    loop {
-                conn.process(Duration::from_millis(60000)).unwrap();
+        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();
@@ -128,6 +138,8 @@ pub struct Battery {
 }

 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,
@@ -146,10 +158,7 @@ impl Battery {
    }

    pub fn detect() -> bool {
-        match get_battery_state() {
-            Ok(_) => true,
-            Err(_) => false,
-        }
+        battery_present().unwrap_or(false)
    }
 }

@@ -69,7 +69,7 @@ impl Calendar {
    fn draw_month(
        &mut self,
        fonts: &mut FontMap,
-        mut view: &mut BufferView,
+        view: &mut BufferView,
        orig: NaiveDate,
        mut time: NaiveDate,
    ) {
@@ -100,7 +100,7 @@ impl Calendar {
                            + (self.size * DAY_FACTOR * 0.2).ceil() as u32,
                    )),
                    c,
-                    &wk_chr,
+                    wk_chr,
                )
                .unwrap();
        }
@@ -124,9 +124,7 @@ impl Calendar {
            12 => "December",
            _ => panic!("impossible value"),
        };
-        month_font
-            .draw_text(&mut view, Color::WHITE, month_str)
-            .unwrap();
+        month_font.draw_text(view, Color::WHITE, month_str).unwrap();

        //
        // Draw the year
@@ -199,7 +197,7 @@ impl Calendar {
    }
 }

-impl<'a> Widget for Calendar {
+impl Widget for Calendar {
    fn get_dirty(&self) -> bool {
        self.dirty
    }
@@ -209,12 +207,9 @@ impl<'a> Widget for Calendar {
    }

    fn event(&mut self, event: &Event) {
-        match event {
-            Event::NewMinute => {
+        if let Event::NewMinute = event {
            self.dirty = true;
        }
-            _ => (),
-        }
    }

    fn draw(&mut self, fonts: &mut FontMap, view: &mut BufferView) -> Geometry {
@@ -299,9 +294,8 @@ impl<'a> Widget for Calendar {
        self.geometry = Geometry {
            x: geometry.x,
            y: geometry.y,
-            width: cal_width * self.shown_sections_x as u32
-                + cal_pad * (self.shown_sections_x as u32 - 1),
-            height: cal_height * self.shown_sections_y as u32,
+            width: cal_width * self.shown_sections_x + cal_pad * (self.shown_sections_x - 1),
+            height: cal_height * self.shown_sections_y,
        };
        self.geometry
    }
@@ -323,7 +317,7 @@ impl<'a> Widget for Calendar {
                    y: 0,
                    width: 0,
                    height: 0,
-                }
+                };
            }
            x => x,
        };
@@ -335,7 +329,7 @@ impl<'a> Widget for Calendar {
                    y: 0,
                    width: 0,
                    height: 0,
-                }
+                };
            }
            y => y,
        };
@@ -344,8 +338,8 @@ impl<'a> Widget for Calendar {
        Geometry {
            x: 0,
            y: 0,
-            width: width,
-            height: height,
+            width,
+            height,
        }
    }
 }
@@ -19,7 +19,7 @@ pub struct Clock {
    colon_width: u32,
 }

-impl<'a> Clock {
+impl Clock {
    pub fn new(fm: &mut FontMap, font: &'static str, size: f32) -> Clock {
        fm.queue_font(font, size, "0123456789: ");
        Clock {
@@ -33,7 +33,7 @@ impl<'a> Clock {
    }
 }

-impl<'a> Widget for Clock {
+impl Widget for Clock {
    fn get_dirty(&self) -> bool {
        self.dirty
    }
@@ -43,12 +43,9 @@ impl<'a> Widget for Clock {
    }

    fn event(&mut self, event: &Event) {
-        match event {
-            Event::NewMinute => {
+        if let Event::NewMinute = event {
            self.dirty = true;
        }
-            _ => (),
-        }
    }

    fn draw(&mut self, fonts: &mut FontMap, view: &mut BufferView) -> Geometry {
@@ -29,7 +29,7 @@ impl Date {
    }
 }

-impl<'a> Widget for Date {
+impl Widget for Date {
    fn get_dirty(&self) -> bool {
        self.dirty
    }
@@ -39,12 +39,9 @@ impl<'a> Widget for Date {
    }

    fn event(&mut self, event: &Event) {
-        match event {
-            Event::NewMinute => {
+        if let Event::NewMinute = event {
            self.dirty = true;
        }
-            _ => (),
-        }
    }

    fn draw(&mut self, fonts: &mut FontMap, view: &mut BufferView) -> Geometry {
@@ -1,10 +1,10 @@
 use std::{
-    cmp::{max, min, Ordering},
+    cmp::{Ordering, max, min},
    collections::HashMap,
    default::Default,
-    fs::{read_to_string, File},
+    fs::{File, read_to_string},
    io::Write,
-    process::{exit, Command},
+    process::{Command, exit},
    sync::{Arc, Mutex},
    thread,
 };
@@ -14,18 +14,18 @@ use crate::{
    color::Color,
    event::{Event, Events, PointerButton, PointerEvent},
    fonts::FontMap,
-    keyboard::{keysyms, KeyEvent},
+    keyboard::{KeyEvent, keysyms},
    utils::{
-        desktop::{load_desktop_cache, load_desktop_files, write_desktop_cache, Desktop},
+        desktop::{Desktop, load_desktop_files},
        xdg,
    },
    widgets::{Geometry, Widget},
 };

-use fuzzy_matcher::skim::SkimMatcherV2;
 use fuzzy_matcher::FuzzyMatcher;
+use fuzzy_matcher::skim::SkimMatcherV2;
 use unicode_segmentation::UnicodeSegmentation;
-use wayland_client::{protocol::wl_keyboard, WEnum};
+use wayland_client::{WEnum, protocol::wl_keyboard};

 struct Matcher {
    matches: HashMap<Desktop, i64>,
@@ -96,13 +96,19 @@ impl Prompt {
        }
    }

+    /// 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;
-            return;
-        } else if new_cursor > self.input.len() as isize {
-            self.cursor = self.input.len()
+        } else if new_cursor > len {
+            self.cursor = len as usize;
        } else {
            self.cursor = new_cursor as usize;
        }
@@ -110,11 +116,11 @@ impl Prompt {

    fn set(&mut self, v: &str) {
        self.input = v.to_string();
-        self.cursor = self.input.len();
+        self.cursor = self.len();
    }

    fn append(&mut self, v: &str) {
-        if self.input.len() == 0 {
+        if self.input.is_empty() {
            match v {
                "!" => {
                    self.mode = PromptMode::Shell;
@@ -128,13 +134,14 @@ impl Prompt {
            }
        }
        let indices: Vec<(usize, &str)> = self.input.grapheme_indices(true).collect();
-        if self.cursor == indices.len() {
-            self.input += &v;
+        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.input.insert_str(index_at, v);
        }
-        self.cursor += 1;
+        self.cursor += v.graphemes(true).count();
    }

    fn backspace(&mut self) {
@@ -168,6 +175,7 @@ impl Prompt {
    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);
@@ -179,6 +187,7 @@ impl Prompt {
    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);
@@ -193,11 +202,55 @@ impl Prompt {
    }

    fn end(&mut self) {
-        self.cursor = self.input.len();
+        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,
@@ -223,16 +276,8 @@ impl Launcher {
            thread::Builder::new()
                .name("desktopini".to_string())
                .spawn(move || {
-                    let mut options = options.lock().unwrap();
-                    *options = match load_desktop_cache() {
-                        Ok(v) => v,
-                        Err(_) => {
-                            let v = load_desktop_files();
-                            write_desktop_cache(&v).unwrap();
-                            v
-                        }
-                    };
-                    drop(options);
+                    let loaded = load_desktop_files();
+                    *options.lock().unwrap() = loaded;
                    let mut events = events.lock().unwrap();
                    events.add_event(Event::LauncherUpdate);
                })
@@ -241,7 +286,7 @@ impl Launcher {

        Launcher {
            next_token: None,
-            options: options,
+            options,
            matches: Vec::new(),
            launch_cmd,
        }
@@ -258,24 +303,37 @@ impl Launcher {
        } else {
            cmd.arg(cmdline);
        }
-        cmd.spawn().unwrap();
-        exit(0);
+        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];
-            if let Some(exec) = &d.exec {
-                let exec = exec
-                    .replace("%f", "")
-                    .replace("%F", "")
-                    .replace("%u", "")
-                    .replace("%U", "");
-
-                self.exec(&exec);
-            }
+            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);
        }
    }

@@ -321,7 +379,7 @@ impl InterfaceWidget for Launcher {
            .auto_draw_text_with_cursor(
                &mut prompt_line,
                fg,
-                &format!("   {}", &intf.prompt.input),
+                &format!("   {}", intf.prompt.input),
                intf.prompt.cursor + 3,
            )
            .unwrap();
@@ -345,8 +403,9 @@ impl InterfaceWidget for Launcher {
                    .fuzzy_indices(&m.name.to_lowercase(), &intf.prompt.input.to_lowercase())
                    .unwrap_or((0, vec![]));

-                let mut colors = Vec::with_capacity(m.name.len());
-                for pos in 0..m.name.len() {
+                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 {
@@ -394,12 +453,21 @@ impl Shell {
        if let Some(token) = &self.next_token {
            cmd.env("XDG_ACTIVATION_TOKEN", token);
        }
-        cmd.args(&args[1..]).spawn().unwrap();
-        exit(0);
+        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(),
@@ -431,7 +499,7 @@ impl InterfaceWidget for Shell {
            .auto_draw_text_with_cursor(
                &mut prompt_line,
                fg,
-                &format!("   {}", &intf.prompt.input),
+                &format!("   {}", intf.prompt.input),
                intf.prompt.cursor + 3,
            )
            .unwrap();
@@ -459,9 +527,9 @@ impl Calc {
        thread::Builder::new()
            .name("calc".to_string())
            .spawn(move || {
-                let s = match read_to_string(format!("{}/wldash/calc", xdg::cache_folder())) {
-                    Ok(s) => s,
-                    _ => return,
+                let s = match read_state("calc") {
+                    Some(s) => s,
+                    None => return,
                };

                let mut old = old_local.lock().unwrap();
@@ -481,20 +549,25 @@ impl Calc {
    }

    fn sync(&self) {
-        let mut f = match File::create(format!("{}/wldash/calc", xdg::cache_folder())) {
-            Ok(f) => f,
-            _ => return,
+        let mut f = match create_state("calc") {
+            Some(f) => f,
+            None => return,
        };

        let old = self.old.lock().unwrap();
        for (input, res) in old.iter() {
-            write!(f, "{}={}\n", input, res).unwrap();
+            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 {
@@ -519,10 +592,7 @@ impl InterfaceWidget for Calc {
            rcalc_lib::parse::eval(&intf.prompt.input, &mut rcalc_lib::parse::CalcState::new())
                .map(|x| format!("{}", x))
                .map_err(|x| format!("{}", x));
-        self.result = match res {
-            Ok(v) => Some(v),
-            Err(_) => None,
-        };
+        self.result = res.ok();
    }

    fn draw(
@@ -545,7 +615,7 @@ impl InterfaceWidget for Calc {
        font.auto_draw_text_with_cursor(
            &mut prompt_line,
            fg,
-            &format!("   {} ", &intf.prompt.input),
+            &format!("   {} ", intf.prompt.input),
            intf.prompt.cursor + 3,
        )
        .unwrap();
@@ -641,7 +711,10 @@ impl Interface {
    fn pointer_input(&mut self, event: &PointerEvent) {
        if let PointerButton::Left = event.button {
            let line_height = self.inner.size.ceil() as u32;
-            let height = self.inner.geometry.height - line_height - 8;
+            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;
@@ -650,19 +723,24 @@ impl Interface {
            } else {
                return;
            };
-            self.inner.selection = (lines - pos / line_height - 1) as usize;
+            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.len() == 0 {
+        if self.inner.prompt.input.is_empty() {
            std::process::exit(0);
        }

-        if let Ok(mut f) = File::create(format!("{}/wldash/prompt", xdg::cache_folder())) {
-            write!(f, "{}", self.inner.prompt.input).unwrap();
-            f.sync_data().unwrap();
+        if let Some(mut f) = create_state("prompt") {
+            let _ = write!(f, "{}", self.inner.prompt.input);
+            let _ = f.sync_data();
        }
        std::process::exit(0);
    }
@@ -691,7 +769,7 @@ impl Interface {
                widget.update(&self.inner);
            }
            keysyms::KEY_r if event.modifiers.ctrl => {
-                if let Ok(s) = read_to_string(format!("{}/wldash/prompt", xdg::cache_folder())) {
+                if let Some(s) = read_state("prompt") {
                    self.inner.prompt.set(&s);
                }
            }
@@ -712,8 +790,11 @@ impl Interface {
            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;
@@ -721,7 +802,7 @@ impl Interface {
            }
            _ => {
                if let Some(utf8) = &event.utf8 {
-                    self.inner.prompt.append(&utf8);
+                    self.inner.prompt.append(utf8);
                    self.inner.selection = 0;
                    widget.update(&self.inner);
                } else {
@@ -751,7 +832,7 @@ impl Widget for Interface {
    }

    fn geometry_update(&mut self, _fonts: &mut FontMap, geometry: &Geometry) -> Geometry {
-        self.inner.geometry = geometry.clone();
+        self.inner.geometry = *geometry;
        self.inner.geometry
    }

@@ -781,3 +862,56 @@ impl Widget for Interface {
        }
    }
 }
+
+#[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");
+    }
+}
@@ -1,3 +1,6 @@
+// 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};
@@ -30,7 +33,7 @@ impl Layout for HorizontalLayout {
        geometry: &Geometry,
        state: &mut State,
    ) -> Geometry {
-        let mut geo = geometry.clone();
+        let mut geo = *geometry;
        let mut max_width = 0;
        let mut max_height = 0;
        for w in self.widgets.iter() {
@@ -79,7 +82,7 @@ impl Layout for VerticalLayout {
        geometry: &Geometry,
        state: &mut State,
    ) -> Geometry {
-        let mut geo = geometry.clone();
+        let mut geo = *geometry;
        let mut max_width = 0;
        let mut max_height = 0;
        for w in self.widgets.iter() {
@@ -159,10 +162,10 @@ impl Layout for InvertedHorizontalLayout {
        geometry: &Geometry,
        state: &mut State,
    ) -> Geometry {
-        let mut geo = geometry.clone();
+        let mut geo = *geometry;
        let mut max_height = 0;
        for w in self.widgets.iter() {
-            let mut temp_geo = geo.clone();
+            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);
@@ -207,10 +210,10 @@ impl Layout for InvertedVerticalLayout {
        geometry: &Geometry,
        state: &mut State,
    ) -> Geometry {
-        let mut geo = geometry.clone();
+        let mut geo = *geometry;
        let mut max_width = 0;
        for w in self.widgets.iter() {
-            let mut temp_geo = geo.clone();
+            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);
@@ -26,13 +26,13 @@ fn monitor(
    use libpulse_binding::{
        callbacks::ListResult,
        context::{
-            subscribe::{Facility, InterestMaskSet},
            Context, FlagSet, State,
+            subscribe::{Facility, InterestMaskSet},
        },
        mainloop::{
            self, api::Mainloop, events::io::FlagSet as IoFlagSet, standard::IterateResult,
        },
-        proplist::{properties, Proplist},
+        proplist::{Proplist, properties},
        volume::Volume,
    };

@@ -48,10 +48,17 @@ fn monitor(
    context.borrow_mut().connect(None, FlagSet::NOFLAGS, None)?;

    loop {
-        mainloop.iterate(false);
+        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 => panic!("damn"),
+            State::Failed | State::Terminated => {
+                return Err("could not connect to pulseaudio".into());
+            }
            _ => (),
        }
    }
@@ -60,15 +67,15 @@ fn monitor(
    let local_inner = inner.clone();
    let local_events = events.clone();
    context.borrow_mut().set_subscribe_callback(Some(Box::new(
-        move |facility, _operation, index| match facility {
-            Some(Facility::Sink) => {
+        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 let Some(_) = &sink_info.name {
+                        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;
@@ -81,7 +88,6 @@ fn monitor(
                    }
                });
            }
-            _ => (),
        },
    )));

@@ -94,7 +100,7 @@ fn monitor(
    introspector.get_sink_info_by_name("@DEFAULT_SINK@", move |res| match res {
        ListResult::End | ListResult::Error => (),
        ListResult::Item(sink_info) => {
-            if let Some(_) = &sink_info.name {
+            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;
@@ -112,7 +118,7 @@ fn monitor(
    let local_context = context.clone();
    let local_inner = inner.clone();
    let event_source = mainloop.new_io_event(
-        pipe as i32,
+        pipe,
        IoFlagSet::INPUT,
        Box::new(move |_, _, _| {
            let mut buf = [0; 8];
@@ -120,15 +126,14 @@ fn monitor(

            let mut inner = local_inner.lock().unwrap();
            let mut introspector = local_context.borrow_mut().introspect();
-            match inner.last_click.take() {
-                Some(Change::Volume(volume)) => {
-                    // do something
-                    let mut vol = inner.channel_volume.unwrap();
+            // 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)) => {
-                    let mut vol = inner.channel_volume.unwrap();
+                (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 {
@@ -141,10 +146,10 @@ fn monitor(
                    inner.channel_volume = Some(vol);
                    introspector.set_sink_volume_by_name("@DEFAULT_SINK@", &vol, None);
                }
-                Some(Change::ToggleMute) => {
+                (Some(Change::ToggleMute), _) => {
                    introspector.set_sink_mute_by_name("@DEFAULT_SINK@", !inner.mute, None);
                }
-                None => (),
+                _ => (),
            }
        }),
    );
@@ -165,7 +170,13 @@ fn monitor(
 fn start_monitor(events: Arc<Mutex<Events>>, inner: Arc<Mutex<InnerAudio>>, pipe: RawFd) {
    thread::Builder::new()
        .name("audiomon".to_string())
-        .spawn(move || monitor(events, inner, pipe).unwrap())
+        .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();
 }

@@ -189,6 +200,8 @@ pub struct PulseAudio {
 }

 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,
@@ -40,7 +40,7 @@ impl Geometry {
            x,
            y,
            width: max(self.width + self.x, other.width + other.x) - x,
-            height: max(self.height + self.y, other.height + other.height) - y,
+            height: max(self.height + self.y, other.height + other.y) - y,
        }
    }

@@ -64,3 +64,33 @@ pub trait Widget {
    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)
+        );
+    }
+}