Try wl-clipboard-rs

Add initial ALSA widget, and put both ALSA and PulseAudio behind feature flags.

.build.yml

@@ -0,0 +1,11 @@
+image: archlinux
+packages:
+  - rust
+  - libpulse
+tasks:
+  - rustfmt-check: |
+      cd wldash
+      cargo fmt -- --check
+  - build: |
+      cd wldash
+      cargo build

.gitignore

@@ -0,0 +1,2 @@
+/target
+**/*.rs.bk

CNAME

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

Cargo.toml

@@ -0,0 +1,44 @@
+[package]
+name = "wldash"
+version = "0.2.0"
+authors = ["Kenny Levinsen <kl@kl.wtf>"]
+edition = "2018"
+
+[profile.release]
+lto = "fat"
+
+[features]
+default = ["alsa-widget", "pulseaudio-widget", "yaml-cfg", "json-cfg"]
+damage_debug = []
+
+yaml-cfg = ["serde_yaml"]
+json-cfg = ["serde_json"]
+
+alsa-widget = ["alsa"]
+pulseaudio-widget = ["libpulse-binding"]
+
+[dependencies]
+smithay-client-toolkit = "0.6.4"
+byteorder = "1.3"
+rusttype = "0.7"
+failure = "0.1.5"
+chrono = "0.4"
+nix = "0.15"
+memmap = "0.7"
+os_pipe = "0.8"
+wayland-client = { version = "0.23", features = ["dlopen"] }
+wayland-protocols = { version = "0.23", features = ["client", "unstable_protocols"] }
+wl-clipboard-rs = { version = "0.3" }
+dbus = "0.6"
+fuzzy-matcher = "0.2"
+lazy_static = "1.4"
+rcalc_lib = { version = "0.9" }
+rust-ini = "0.13"
+shlex = "0.1"
+
+serde = { version = "1.0", features = ["derive"] }
+serde_json = { version = "1.0", optional = true }
+serde_yaml = { version = "0.8", optional = true }
+
+libpulse-binding = { version = "2.11", optional = true }
+alsa = { version = "0.3.0", optional = true }

LICENSE

@@ -0,0 +1,674 @@
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+  13. Use with the GNU Affero General Public License.
+
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+
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+
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+be similar in spirit to the present version, but may differ in detail to
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+  If the Program specifies that a proxy can decide which future
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+  15. Disclaimer of Warranty.
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+
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+<https://www.gnu.org/licenses/why-not-lgpl.html>.

README.md

@@ -0,0 +1,65 @@
+# wldash
+
+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.
+
+## How to use
+
+1. Checkout: `git clone https://github.com/kennylevinsen/wldash`
+2. Build: `cargo build --release`
+3. Put somewhere: `cp target/release/wldash /usr/local/bin/wldash`
+4. Run: `wldash`
+
+To see the default configuration, run `wldash print-config`. To configure, place a file in `$XDG_CONFIG_HOME/wldash/config.yaml` (or if `XDG_CONFIG_HOME` is not set, `~/.config/wldash/config.yaml`). JSON is also currently supported.
+
+Notable settings: `outptuMode` can be `active` or `all`, `scale` can be set to `2` to half the buffer size, and the widgets (and their layout) can be configured.
+
+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
+- Configurability
+- Cleanup and reorganization
+- Proper line editor for the launcher

config.json

@@ -0,0 +1,55 @@
+{
+	"widget": {
+		"margin": {
+			"margins": [20,20,20,20],
+			"widget": {
+				"verticalLayout": [{
+					"horizontalLayout": [{
+						"margin": {
+							"margins": [0,88,0,32],
+							"widget": {
+								"verticalLayout": [
+									{"date": {"font_size": 64.0}},
+									{"clock": {"font_size": 256.0}}
+								]
+							}
+						}
+					},{
+						"verticalLayout": [{
+							"margin": {
+								"margins": [0,0,0,8],
+								"widget": {"battery": {"font_size": 24.0,"length": 600}}
+							}
+						},{
+							"margin": {
+								"margins": [0,0,0,8],
+								"widget": {"backlight": {"font_size": 24.0,"length": 600}}
+							}
+						},{
+							"margin": {
+								"margins": [0,0,0,8],
+								"widget": {"pulseAudio": {"font_size": 24.0,"length": 600}}
+							}
+						}]
+					}
+				]},
+				{"calendar": {"font_size": 16.0,"sections": 3}},
+				{"launcher": {
+					"font_size": 32.0,
+					"length": 1200, 
+	            "app_opener": "swaymsg exec ",
+	            "term_opener": "alacritty -e ",
+	            "url_opener": "xdg-open "
+	         }}
+			]}
+		}
+	},
+	"outputMode": "active",
+	"scale": 1,
+	"background": {
+		"red": 0,
+		"green": 0,
+		"blue": 0,
+		"opacity": 0.9
+	}
+}

config.yaml

@@ -0,0 +1,49 @@
+outputMode: active
+scale: 1
+background:
+  red: 0.0
+  green: 0.0
+  blue: 0.0
+  opacity: 0.9
+widget:
+  margin:
+    margins: [20, 20, 20, 20]
+    widget:
+      verticalLayout:
+        - horizontalLayout:
+            - margin:
+                margins: [0, 88, 0, 32]
+                widget:
+                  verticalLayout:
+                    - date:
+                        font_size: 64.0
+                    - clock:
+                        font_size: 256.0
+            - verticalLayout:
+                - margin:
+                    margins: [0, 0, 0, 8]
+                    widget:
+                      battery:
+                        font_size: 24.0
+                        length: 600
+                - margin:
+                    margins: [0, 0, 0, 8]
+                    widget:
+                      backlight:
+                        font_size: 24.0
+                        length: 600
+                - margin:
+                    margins: [0, 0, 0, 8]
+                    widget:
+                      pulseAudio:
+                        font_size: 24.0
+                        length: 600
+        - calendar:
+            font_size: 16.0
+            sections: 3
+        - launcher:
+            font_size: 32.0
+            length: 1200
+            app_opener: "swaymsg exec "
+            term_opener: "alacritty -e "
+            url_opener: "xdg-open "

fonts/wqy-microhei/ChangeLog.txt

@@ -0,0 +1,38 @@
+
+==========================================================
+
+                 Wen Quan Yi Micro Hei
+
+                     ChangeLog
+
+----------------------------------------------------------
+
+WenQuanYi Micro Hei ChangeLog:
+
+== WenQuanYi Micro Hei 0.2 (BigBang), FangQ <fangq nmr mgh harvard edu> ==
+
+ 2009/05/25  Updated contributor list in the NB and announced beta release
+ 2009/05/18  fixed hinting instr for M/N in MicroHeiMono by copying cvt table (F
+angQ)
+ 2009/05/16  added Micro Hei Mono by merging with Droid Sans Mono (FangQ)
+ 2009/05/15  rename uni00B9 to onesuperior to match the it in DroidSans (FangQ)
+ 2009/05/10  updated documentations (FangQ)
+ 2009/05/09  scale MicroHei to EM=2048 before merging to Droid Sans, keep
+             all hinting and kerning info. (FangQ)
+ 2009/04/12  imported Chinese punctuations from UmeGothic (FangQ)
+ 2009/02/08  all characters in U4E00~U9FC3 were complete (review panel, wanghong
+)
+ 2009/01/16  Micro Hei nightly-build became active (FangQ)
+ 2009/01/15  GBK glyph review process started (FangQ)
+ 2009/01/03  Fontopia supported sub-contour editing (FangQ)
+ 2008/12/31  GBK char-set completed 90%, CJK Ext. A became online
+ 2008/12/29  project publicly announcement (FangQ)
+ 2008/12/09  Droid Font license confirmed (Apache2 as committed in git)
+ 2008/12/03  add theme and rename as Fontopia (FangQ)
+ 2008/11/23  Droid extension GUI milestone reached (mozbug, FangQ)
+ 2008/11/07  initial upload of BezierGlyph/Bezier_lib.js script (mozbug)
+ 2008/11/06  code point and script preparation (mozbug)
+ 2008/10/21  project conceptualized (FangQ)
+
+
+

fonts/wqy-microhei/LICENSE_Apache2.txt

@@ -0,0 +1,122 @@
+Apache License
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fonts/wqy-microhei/LICENSE_GPLv3.txt

@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
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+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
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+
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fonts/wqy-microhei/README.txt

@@ -0,0 +1,378 @@
+
+==========================================================
+
+                 Wen Quan Yi Micro Hei
+
+                    Release Notes
+
+----------------------------------------------------------
+
+Summary:
+
+    Author   : WenQuanYi Project Contributors
+    Webpage  : http://wenq.org/en/ or http://wqy.sourceforge.net/en/
+    Font Name: WenQuanYi Micro Hei
+    Version  : 0.2.0-beta (Big-Bang)
+    Release  : 0
+    Copyright  Digitized data copyright © 2007, Google Corporation.
+               Copyright © 2008-2009, WenQuanYi Project Board of
+               Trustees, All rights reserved.
+
+               Droid Sans Fallback extension interface
+               ( http://wenq.org/index.cgi?Fontopia(cn) ),
+               copyright © 2008-2009 mozbug and Qianqian Fang
+    License  : This font is licensed under Apache2.0 or GPLv3
+               with font embedding exceptions (see Appendix B).
+               Read LICENSE_Apache2.txt and LICENSE_GPLv3.txt for details
+
+----------------------------------------------------------
+
+Table of Content
+
+ I.    About this font
+ II.   Development History
+ III.  Credits
+ IV.   Language Coverage
+ V.    About "WenQuanYi Project"
+ VI.   Links
+ VII.  Appendix
+
+----------------------------------------------------------
+
+
+ I. About this font
+
+WenQuanYi Micro Hei font family is a Sans-Serif style (also known as Hei,
+Gothic or Dotum among the Chinese/Japanese/Korean users) high quality
+CJK outline font. It was derived from "Droid Sans Fallback", "Droid
+Sans" and "Droid Sans Mono" released by Google Corp. This font package
+contains two faces, "Micro Hei" and "Micro Hei Mono", in form of a
+True-Type Collection (ttc) file. All the unified CJK Han glyphs, i.e.
+GBK Hanzi, in the range of U+4E00-U+9FC3 defined in Unicode Standard 5.1
+are covered, with additional support to many other international
+languages such as Latin, Extended Latin, Hanguls and Kanas. The font
+file is extremely compact (~5M) compared with most known CJK fonts.
+As a result, it can be used for hand-held devices or embedded systems, or
+used on PC with a significantly small memory footprint. Because both
+font faces carry hinting and kerning instructions for Latin glyphs,
+they are the excellent choices for desktop fonts.
+
+
+ II. Development History
+
+The original Droid Sans Fallback font contain 16,000 Unified Han glyphs,
+and was officially released by Google under Apache2 license on Dec. 9,
+2008 [2]. With a Javascript-based web interface, Fontopia(TM) [1], developed
+by mozbug and Qianqian Fang, the WenQuanYi contributors had completed
+over 10,000 new glyphs by combining the spline contours from the existing
+Droid Han glyphs. By the end of 2008, project phase-1 had almost
+completed, and phase-2 for CJK Extension A (U+3400-U+4DB5) was brought
+online on Dec. 29, 2009. A review panel was formed to reinforce the
+quality of all submitted glyphs [3]. In Jan. 2009, the reviewers
+had redone over 2000 Hanzi and completed all the missing characters.
+The nightly-build font has become online since Jan. 16. As of Feb. 2009, there
+has been over 5500 CJK Extension A Han glyphs completed, which led this
+font toward a complete GB18030 coverage.
+
+In this font, we incorporated the high quality Latin glyphs from "Droid Sans"
+and "Droid Sans Mono", which contain not only a better coverage but also
+the additional hinting and kerning information. The EM of MicroHei
+and MicroHeiMono fonts were unified to 2048 to retain all the advanced
+typesetting features.
+
+
+ III. Credits
+
+We cordially thank Google(TM) for generously releasing Droid fonts to
+public under an open-source license. Google purchased the font from
+Ascenders Corp. (which was originally designed by a Chinese company).
+
+The project for extending the Droid fonts is based on the web-based
+glyph-composing applet [1], created by mozbug and Qianqian Fang
+jointly. They are constantly improving this application targeting at
+a web-based collaborative font development environment.
+
+Over a thousand anonymous contributors have participated the project;
+they submitted over 10,000 new Hanzi glyphs and many modifications.
+The full update history of the glyphs can be found at [4].
+
+The key members of the review panel, i.e. lsz, FangQ, kmc, Xhacker,
+philacorns, and an "anonymous" (as requested) contributor, had
+spent significant amount of efforts to redesign nearly half of the
+submitted glyphs. We appreciate the incredible effort from this team
+to make this font available. The detailed review credit can be found
+at [3]
+
+
+ IV.    Language Coverage
+
+The following table is based on the locale data provided by fontconfig
+(generated by langcover.pl from Dejavu Project
+http://dejavu.sourceforge.net/wiki/index.php/Font_utilities).
+  ----------------------------------------------------------------
+    Locale                                           MicroHei
+  ----------------------------------------------------------------
+  aa     Afar                                     100% (62/62)
+  ab     Abkhazia                                 100% (90/90)
+  af     Afrikaans                                100% (69/69)
+  am     Amharic                                       (0/264)
+  ar     Arabic                                        (0/125)
+  as                                                   (0/89)
+  ast    Asturian                                 100% (72/72)
+  ava    Avaric                                   100% (67/67)
+  ay     Aymara                                   100% (60/60)
+  az     Azerbaijani                               98% (146/148)
+  az-ir  Azerbaijani in Iran                           (0/130)
+  ba     Bashkir                                  100% (82/82)
+  bam    Bambara                                   90% (54/60)
+  be     Byelorussian                             100% (68/68)
+  bg     Bulgarian                                100% (60/60)
+  bh     Bihari (Devanagari script)                    (0/68)
+  bho    Bhojpuri (Devanagari script)                  (0/68)
+  bi     Bislama                                  100% (58/58)
+  bin    Edo or Bini                              100% (78/78)
+  bn     Bengali                                       (0/89)
+  bo     Tibetan                                       (0/95)
+  br     Breton                                   100% (64/64)
+  bs     Bosnian                                  100% (62/62)
+  bua    Buriat (Buryat)                          100% (70/70)
+  ca     Catalan                                  100% (74/74)
+  ce     Chechen                                  100% (67/67)
+  ch     Chamorro                                 100% (58/58)
+  chm    Mari (Lower Cheremis / Upper Cheremis)   100% (76/76)
+  chr    Cherokee                                      (0/85)
+  co     Corsican                                 100% (85/85)
+  cs     Czech                                    100% (82/82)
+  cu     Old Church Slavonic                      100% (103/103)
+  cv     Chuvash                                  100% (74/74)
+  cy     Welsh                                    100% (78/78)
+  da     Danish                                   100% (70/70)
+  de     German                                   100% (60/60)
+  dz     Dzongkha                                      (0/95)
+  el     Greek                                    100% (70/70)
+  en     English                                  100% (73/73)
+  eo     Esperanto                                100% (64/64)
+  es     Spanish                                  100% (67/67)
+  et     Estonian                                 100% (64/64)
+  eu     Basque                                   100% (56/56)
+  fa     Persian                                       (0/129)
+  fi     Finnish                                  100% (63/63)
+  fj     Fijian                                   100% (52/52)
+  fo     Faroese                                  100% (68/68)
+  fr     French                                   100% (85/85)
+  ful    Fulah (Fula)                              87% (54/62)
+  fur    Friulian                                 100% (66/66)
+  fy     Frisian                                  100% (75/75)
+  ga     Irish                                     82% (66/80)
+  gd     Scots Gaelic                             100% (70/70)
+  gez    Ethiopic (Geez)                               (0/218)
+  gl     Galician                                 100% (66/66)
+  gn     Guarani                                  100% (70/70)
+  gu     Gujarati                                      (0/78)
+  gv     Manx Gaelic                              100% (54/54)
+  ha     Hausa                                     86% (52/60)
+  haw    Hawaiian                                  98% (62/63)
+  he     Hebrew                                        (0/27)
+  hi     Hindi (Devanagari script)                     (0/68)
+  ho     Hiri Motu                                100% (52/52)
+  hr     Croatian                                 100% (62/62)
+  hu     Hungarian                                100% (70/70)
+  hy     Armenian                                      (0/77)
+  ia     Interlingua                              100% (52/52)
+  ibo    Igbo                                     100% (58/58)
+  id     Indonesian                               100% (54/54)
+  ie     Interlingue                              100% (52/52)
+  ik     Inupiaq (Inupiak, Eskimo)                100% (68/68)
+  io     Ido                                      100% (52/52)
+  is     Icelandic                                100% (70/70)
+  it     Italian                                  100% (73/73)
+  iu     Inuktitut                                     (0/161)
+  ja     Japanese                                  99% (6526/6538)
+  ka     Georgian                                      (0/33)
+  kaa    Kara-Kalpak (Karakalpak)                 100% (78/78)
+  ki     Kikuyu                                   100% (56/56)
+  kk     Kazakh                                   100% (77/77)
+  kl     Greenlandic                              100% (81/81)
+  km     Khmer                                         (0/70)
+  kn     Kannada                                       (0/80)
+  ko     Korean                                   100% (2443/2443)
+  kok    Kokani (Devanagari script)                    (0/68)
+  ks     Kashmiri (Devanagari script)                  (0/68)
+  ku     Kurdish                                  100% (64/64)
+  ku-ir  Kurdish in Iran                               (0/32)
+  kum    Kumyk                                    100% (66/66)
+  kv     Komi (Komi-Permyak/Komi-Siryan)          100% (70/70)
+  kw     Cornish                                   96% (62/64)
+  ky     Kirgiz                                   100% (70/70)
+  la     Latin                                    100% (68/68)
+  lb     Luxembourgish (Letzeburgesch)            100% (75/75)
+  lez    Lezghian (Lezgian)                       100% (67/67)
+  ln     Lingala                                   92% (75/81)
+  lo     Lao                                           (0/65)
+  lt     Lithuanian                               100% (70/70)
+  lv     Latvian                                  100% (78/78)
+  mg     Malagasy                                 100% (56/56)
+  mh     Marshallese                              100% (62/62)
+  mi     Maori                                     96% (62/64)
+  mk     Macedonian                               100% (42/42)
+  ml     Malayalam                                     (0/78)
+  mn     Mongolian                                     (0/130)
+  mo     Moldavian                                 98% (126/128)
+  mr     Marathi (Devanagari script)                   (0/68)
+  mt     Maltese                                  100% (72/72)
+  my     Burmese (Myanmar)                             (0/48)
+  nb     Norwegian Bokmal                         100% (70/70)
+  nds    Low Saxon                                100% (59/59)
+  ne     Nepali (Devanagari script)                    (0/68)
+  nl     Dutch                                    100% (83/83)
+  nn     Norwegian Nynorsk                        100% (76/76)
+  no     Norwegian (Bokmal)                       100% (70/70)
+  ny     Chichewa                                 100% (54/54)
+  oc     Occitan                                  100% (70/70)
+  om     Oromo or Galla                           100% (52/52)
+  or     Oriya                                         (0/79)
+  os     Ossetic                                  100% (66/66)
+  pa     Punjabi (Gurumukhi script)                    (0/63)
+  pl     Polish                                   100% (70/70)
+  ps-af  Pashto in Afghanistan                         (0/49)
+  ps-pk  Pashto in Pakistan                            (0/49)
+  pt     Portuguese                               100% (83/83)
+  rm     Rhaeto-Romance (Romansch)                100% (66/66)
+  ro     Romanian                                  96% (60/62)
+  ru     Russian                                  100% (66/66)
+  sa     Sanskrit (Devanagari script)                  (0/68)
+  sah    Yakut                                    100% (76/76)
+  sco    Scots                                     92% (52/56)
+  se     North Sami                               100% (66/66)
+  sel    Selkup (Ostyak-Samoyed)                  100% (66/66)
+  sh     Serbo-Croatian                           100% (76/76)
+  si     Sinhala (Sinhalese)                           (0/77)
+  sk     Slovak                                   100% (86/86)
+  sl     Slovenian                                100% (62/62)
+  sm     Samoan                                    98% (52/53)
+  sma    South Sami                               100% (60/60)
+  smj    Lule Sami                                100% (60/60)
+  smn    Inari Sami                               100% (68/68)
+  sms    Skolt Sami                                87% (70/80)
+  so     Somali                                   100% (52/52)
+  sq     Albanian                                 100% (56/56)
+  sr     Serbian                                  100% (76/76)
+  sv     Swedish                                  100% (68/68)
+  sw     Swahili                                  100% (52/52)
+  syr    Syriac                                        (0/45)
+  ta     Tamil                                         (0/48)
+  te     Telugu                                        (0/80)
+  tg     Tajik                                    100% (78/78)
+  th     Thai                                       1% (1/87)
+  ti-er  Eritrean Tigrinya                             (0/256)
+  ti-et  Ethiopian Tigrinya                            (0/282)
+  tig    Tigre                                         (0/221)
+  tk     Turkmen                                  100% (74/74)
+  tl     Tagalog                                       (0/19)
+  tn     Tswana                                   100% (56/56)
+  to     Tonga                                     98% (52/53)
+  tr     Turkish                                  100% (70/70)
+  ts     Tsonga                                   100% (52/52)
+  tt     Tatar                                    100% (76/76)
+  tw     Twi                                       91% (67/73)
+  tyv    Tuvinian                                 100% (70/70)
+  ug     Uighur                                        (0/125)
+  uk     Ukrainian                                100% (72/72)
+  ur     Urdu                                          (0/145)
+  uz     Uzbek                                    100% (68/68)
+  ven    Venda                                     83% (52/62)
+  vi     Vietnamese                                98% (191/194)
+  vo     Volapuk                                  100% (54/54)
+  vot    Votic                                    100% (62/62)
+  wa     Walloon                                  100% (70/70)
+  wen    Sorbian languages (lower and upper)      100% (76/76)
+  wo     Wolof                                    100% (66/66)
+  xh     Xhosa                                    100% (52/52)
+  yap    Yapese                                   100% (58/58)
+  yi     Yiddish                                       (0/27)
+  yo     Yoruba                                    91% (109/119)
+  zh-936                                           99% (21873/21920)
+  zh-cn  Chinese (simplified)                      99% (6754/6765)
+  zh-hk  Chinese Hong Kong Supplementary Character Set  99% (2212/2213)
+  zh-mo  Chinese in Macau                          99% (2212/2213)
+  zh-sg  Chinese in Singapore                      99% (6754/6765)
+  zh-tw  Chinese (traditional)                     99% (13051/13063)
+  zu     Zulu                                     100% (52/52)
+  ----------------------------------------------------------------
+
+ V.    About "WenQuanYi Project"
+
+The "Wen Quan Yi" Project [5] was founded by Qianqian Fang [6] in
+Oct. 2004. The goal of this project is to create a web-based
+collaborative environment for open-source type-face development.
+The initial focus of the project is to create high quality bitmap
+character glyphs and outline fonts for all 70,000+ CJK characters
+currently encoded by the Unicode Consortium. Some of the fonts
+released by this project have been widely used as the default
+Chinese desktop fonts by main-stream GNU/Linux distributions.
+
+The Wen Quan Yi Project uses wiki [5] as the primary development
+tool for glyph creation, documentation and coordinations. Wen Quan Yi
+wiki also supports glyph version control and nightly build.
+
+
+ VI.    Links
+
+[1] http://wenq.org/index.cgi?Fontopia(cn)
+[2] http://android.git.kernel.org/?p=platform/frameworks/base.git;a=commit;h=1a2
+d9dbe9c6f54c5e0dc26386dc01df1d18073ad
+[3] http://wenq.org/dev/index.cgi?BigBang_TASK
+[4] http://wenq.org/WQYHistory.html.gz
+[5] http://wenq.org/en/
+[6] http://nmr.mgh.harvard.edu/~fangq/
+
+
+ VII. Appendix
+
+Appendix A.
+
+Copyright disclaimer for UmeFont
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright notice,
+   this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+3. Neither the name of the Wada Laboratory, the University of Tokyo nor
+   the names of its contributors may be used to endorse or promote products
+   derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY WADA LABORATORY, THE UNIVERSITY OF TOKYO AND
+CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
+NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE LABORATORY OR
+CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+Appendix B.
+
+GPL with font embedding exception:
+
+http://www.gnu.org/licenses/old-licenses/gpl-2.0-faq.html#FontException
+
+As a special exception, if you create a document which uses this
+font, and embed this font or unaltered portions of this font into
+the document, this font does not by itself cause the resulting
+document to be covered by the GNU General Public License. This
+exception does not however invalidate any other reasons why the
+document might be covered by the GNU General Public License. If you
+modify this font, you may extend this exception to your version of
+the font, but you are not obligated to do so. If you do not wish to
+do so, delete this exception statement from your version.
+
+
+

index.html

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

src/app.rs

@@ -0,0 +1,570 @@
+use std::collections::VecDeque;
+use std::sync::mpsc::Sender;
+use std::sync::{Arc, Mutex};
+
+use chrono::Local;
+
+use smithay_client_toolkit::keyboard::{
+    keysyms, map_keyboard_auto, Event as KbEvent, KeyState, ModifiersState,
+};
+
+use wayland_client::protocol::{wl_compositor, wl_output, wl_pointer, wl_shm, wl_surface};
+use wayland_client::{Display, EventQueue, GlobalEvent, GlobalManager, NewProxy};
+use wayland_protocols::wlr::unstable::layer_shell::v1::client::{
+    zwlr_layer_shell_v1, zwlr_layer_surface_v1,
+};
+
+use crate::buffer::Buffer;
+use crate::color::Color;
+use crate::widget::{DrawContext, Widget};
+
+use crate::cmd::Cmd;
+use crate::doublemempool::DoubleMemPool;
+
+#[derive(Debug)]
+pub enum OutputMode {
+    Active,
+    All,
+}
+
+struct AppInner {
+    compositor: Option<wl_compositor::WlCompositor>,
+    surfaces: Vec<wl_surface::WlSurface>,
+    shell_surfaces: Vec<zwlr_layer_surface_v1::ZwlrLayerSurfaceV1>,
+    configured_surfaces: Arc<Mutex<usize>>,
+    outputs: Vec<(u32, wl_output::WlOutput)>,
+    shell: Option<zwlr_layer_shell_v1::ZwlrLayerShellV1>,
+    draw_tx: Sender<Cmd>,
+    output_mode: OutputMode,
+    visible: bool,
+    scale: u32,
+}
+
+impl AppInner {
+    fn new(tx: Sender<Cmd>, output_mode: OutputMode, scale: u32) -> AppInner {
+        AppInner {
+            compositor: None,
+            surfaces: Vec::new(),
+            shell_surfaces: Vec::new(),
+            configured_surfaces: Arc::new(Mutex::new(0)),
+            outputs: Vec::new(),
+            shell: None,
+            draw_tx: tx,
+            output_mode: output_mode,
+            visible: true,
+            scale: scale,
+        }
+    }
+
+    fn add_shell_surface(
+        compositor: &wl_compositor::WlCompositor,
+        shell: &zwlr_layer_shell_v1::ZwlrLayerShellV1,
+        scale: u32,
+        configured_surfaces: Arc<Mutex<usize>>,
+        tx: Sender<Cmd>,
+        output: Option<&wl_output::WlOutput>,
+    ) -> (
+        wl_surface::WlSurface,
+        zwlr_layer_surface_v1::ZwlrLayerSurfaceV1,
+    ) {
+        let surface = compositor
+            .create_surface(NewProxy::implement_dummy)
+            .unwrap();
+
+        let this_is_stupid = Arc::new(Mutex::new(false));
+
+        let shell_surface = shell
+            .get_layer_surface(
+                &surface,
+                output,
+                zwlr_layer_shell_v1::Layer::Overlay,
+                "".to_string(),
+                move |layer| {
+                    layer.implement_closure(
+                        move |evt, layer| match evt {
+                            zwlr_layer_surface_v1::Event::Configure { serial, .. } => {
+                                let mut x = this_is_stupid.lock().unwrap();
+                                if !*x {
+                                    *x = true;
+                                    *(configured_surfaces.lock().unwrap()) += 1;
+                                    layer.ack_configure(serial);
+                                    tx.send(Cmd::ForceDraw).unwrap();
+                                }
+                            }
+                            _ => unreachable!(),
+                        },
+                        (),
+                    )
+                },
+            )
+            .unwrap();
+
+        shell_surface.set_keyboard_interactivity(1);
+        surface.set_buffer_scale(scale as i32);
+        surface.commit();
+        (surface, shell_surface)
+    }
+
+    fn outputs_changed(&mut self) {
+        let shell = match self.shell {
+            Some(ref shell) => shell.to_owned(),
+            None => return,
+        };
+        let compositor = match self.compositor {
+            Some(ref c) => c.to_owned(),
+            None => return,
+        };
+
+        for shell_surface in self.shell_surfaces.iter() {
+            shell_surface.destroy();
+        }
+        for surface in self.surfaces.iter() {
+            surface.destroy();
+        }
+
+        self.configured_surfaces = Arc::new(Mutex::new(0));
+
+        if !self.visible {
+            self.surfaces = Vec::new();
+            self.shell_surfaces = Vec::new();
+            return;
+        }
+
+        match self.output_mode {
+            OutputMode::Active => {
+                if self.shell_surfaces.len() > 0 {
+                    return;
+                }
+
+                let (surface, shell_surface) = AppInner::add_shell_surface(
+                    &compositor,
+                    &shell,
+                    self.scale,
+                    self.configured_surfaces.clone(),
+                    self.draw_tx.clone(),
+                    None,
+                );
+                self.surfaces = vec![surface];
+                self.shell_surfaces = vec![shell_surface];
+            }
+            OutputMode::All => {
+                let mut surfaces = Vec::new();
+                let mut shell_surfaces = Vec::new();
+                for output in self.outputs.iter() {
+                    let (surface, shell_surface) = AppInner::add_shell_surface(
+                        &compositor,
+                        &shell,
+                        self.scale,
+                        self.configured_surfaces.clone(),
+                        self.draw_tx.clone(),
+                        Some(&output.1),
+                    );
+                    surfaces.push(surface);
+                    shell_surfaces.push(shell_surface);
+                }
+                self.surfaces = surfaces;
+                self.shell_surfaces = shell_surfaces;
+            }
+        }
+        self.draw_tx.send(Cmd::ForceDraw).unwrap();
+    }
+
+    fn add_output(&mut self, id: u32, output: wl_output::WlOutput) {
+        self.outputs.push((id, output));
+        self.outputs_changed();
+    }
+
+    fn remove_output(&mut self, id: u32) {
+        let old_output = self.outputs.iter().find(|(output_id, _)| *output_id == id);
+        if let Some(output) = old_output {
+            let new_outputs = self
+                .outputs
+                .iter()
+                .filter(|(output_id, _)| *output_id != id)
+                .map(|(x, y)| (x.clone(), y.clone()))
+                .collect();
+            if output.1.as_ref().version() >= 3 {
+                output.1.release()
+            }
+            self.outputs = new_outputs;
+            self.outputs_changed();
+        }
+    }
+
+    fn set_compositor(&mut self, compositor: Option<wl_compositor::WlCompositor>) {
+        self.compositor = compositor
+    }
+
+    fn set_shell(&mut self, shell: Option<zwlr_layer_shell_v1::ZwlrLayerShellV1>) {
+        self.shell = shell
+    }
+}
+
+pub struct App {
+    pools: DoubleMemPool,
+    display: Display,
+    event_queue: EventQueue,
+    cmd_queue: Arc<Mutex<VecDeque<Cmd>>>,
+    widget: Option<Box<dyn Widget + Send>>,
+    bg: Color,
+    inner: Arc<Mutex<AppInner>>,
+    last_damage: Option<Vec<(i32, i32, i32, i32)>>,
+    last_dim: (u32, u32),
+}
+
+impl App {
+    pub fn redraw(&mut self, force: bool) -> Result<(), ::std::io::Error> {
+        let widget = match self.widget {
+            Some(ref mut widget) => widget,
+            None => return Ok(()),
+        };
+
+        let inner = self.inner.lock().unwrap();
+        let time = Local::now();
+
+        if !inner.visible
+            || inner.shell_surfaces.len() != *inner.configured_surfaces.lock().unwrap()
+            || inner.surfaces.len() == 0
+        {
+            // Not ready yet
+            return Ok(());
+        }
+
+        let (last, pool) = match self.pools.pool() {
+            Some((last, pool)) => (last, pool),
+            None => return Ok(()),
+        };
+
+        let size = widget.size();
+        let size_changed = self.last_dim != size;
+        let force = force | size_changed;
+
+        // resize the pool if relevant
+        pool.resize((4 * size.0 * size.1) as usize)
+            .expect("Failed to resize the memory pool.");
+        let mmap = pool.mmap();
+        let mut buf = Buffer::new(mmap, size);
+
+        // Copy old damage
+        let force = match (force, &self.last_damage) {
+            (false, Some(d)) => {
+                let lastmmap = last.mmap();
+                let last = Buffer::new(lastmmap, size);
+
+                if cfg!(feature = "damage_debug") {
+                    buf.memset(&Color::new(0.5, 0.75, 0.75, 1.0));
+                }
+                for d in d {
+                    last.copy_to(&mut buf, d.clone());
+                }
+                false
+            }
+            _ => true,
+        };
+
+        if force {
+            buf.memset(&self.bg);
+        }
+        let report = widget.draw(
+            &mut DrawContext {
+                buf: &mut buf,
+                bg: &self.bg,
+                time: &time,
+                force,
+            },
+            (0, 0),
+        )?;
+
+        mmap.flush().unwrap();
+
+        if !force && !report.full_damage && report.damage.len() == 0 {
+            // Nothing to do
+            self.pools.never_mind();
+            return Ok(());
+        }
+
+        // get a buffer and attach it
+        let new_buffer = pool.buffer(
+            0,
+            report.width as i32,
+            report.height as i32,
+            4 * size.0 as i32,
+            wl_shm::Format::Argb8888,
+        );
+        if size_changed {
+            for shell_surface in inner.shell_surfaces.iter() {
+                shell_surface.set_size(size.0 / inner.scale, size.1 / inner.scale);
+            }
+        }
+        for surface in inner.surfaces.iter() {
+            surface.attach(Some(&new_buffer), 0, 0);
+            if cfg!(feature = "damage_debug") || force || report.full_damage {
+                surface.damage_buffer(0, 0, size.0 as i32, size.1 as i32);
+            } else {
+                for d in report.damage.iter() {
+                    surface.damage_buffer(d.0, d.1, d.2, d.3);
+                }
+            }
+            surface.commit();
+        }
+        self.last_damage = if force || report.full_damage {
+            Some(vec![(0, 0, size.0 as i32, size.1 as i32)])
+        } else {
+            Some(report.damage)
+        };
+        self.last_dim = size;
+        Ok(())
+    }
+
+    pub fn hide(&mut self) {
+        let mut inner = self.inner.lock().unwrap();
+        inner.visible = false;
+        self.last_dim = (0, 0);
+        inner.outputs_changed();
+    }
+
+    pub fn show(&mut self) {
+        let mut inner = self.inner.lock().unwrap();
+        inner.visible = true;
+        self.last_dim = (0, 0);
+        inner.outputs_changed();
+    }
+
+    pub fn cmd_queue(&self) -> Arc<Mutex<VecDeque<Cmd>>> {
+        self.cmd_queue.clone()
+    }
+
+    pub fn flush_display(&mut self) {
+        self.display.flush().expect("unable to flush display");
+    }
+
+    pub fn event_queue(&mut self) -> &mut EventQueue {
+        &mut self.event_queue
+    }
+
+    pub fn get_widget(&mut self) -> &mut Box<dyn Widget + Send> {
+        self.widget.as_mut().unwrap()
+    }
+
+    pub fn set_widget(&mut self, w: Box<dyn Widget + Send>) -> Result<(), ::std::io::Error> {
+        self.widget = Some(w);
+        self.redraw(true)
+    }
+
+    pub fn new(tx: Sender<Cmd>, output_mode: OutputMode, bg: Color, scale: u32) -> App {
+        let inner = Arc::new(Mutex::new(AppInner::new(tx.clone(), output_mode, scale)));
+
+        //
+        // Set up modules
+        //
+
+        let cmd_queue = Arc::new(Mutex::new(VecDeque::new()));
+
+        let (display, mut event_queue) = Display::connect_to_env().unwrap();
+
+        let display_wrapper = display
+            .as_ref()
+            .make_wrapper(&event_queue.get_token())
+            .unwrap()
+            .into();
+
+        //
+        // Set up global manager
+        //
+        let inner_global = inner.clone();
+        let manager =
+            GlobalManager::new_with_cb(&display_wrapper, move |event, registry| match event {
+                GlobalEvent::New {
+                    id,
+                    ref interface,
+                    version,
+                } => {
+                    if let "wl_output" = &interface[..] {
+                        let output = registry
+                            .bind(version, id, move |output| {
+                                output.implement_closure(move |_, _| {}, ())
+                            })
+                            .unwrap();
+                        inner_global.lock().unwrap().add_output(id, output);
+                    }
+                }
+                GlobalEvent::Removed { id, ref interface } => {
+                    if let "wl_output" = &interface[..] {
+                        inner_global.lock().unwrap().remove_output(id);
+                    }
+                }
+            });
+
+        // double sync to retrieve the global list
+        // and the globals metadata
+        event_queue.sync_roundtrip().unwrap();
+        event_queue.sync_roundtrip().unwrap();
+
+        // wl_compositor
+        let compositor: wl_compositor::WlCompositor = manager
+            .instantiate_range(1, 4, NewProxy::implement_dummy)
+            .expect("server didn't advertise `wl_compositor`");
+
+        inner.lock().unwrap().set_compositor(Some(compositor));
+
+        // wl_shm
+        let shm_formats = Arc::new(Mutex::new(Vec::new()));
+        let shm_formats2 = shm_formats.clone();
+        let shm = manager
+            .instantiate_range(1, 1, |shm| {
+                shm.implement_closure(
+                    move |evt, _| {
+                        if let wl_shm::Event::Format { format } = evt {
+                            shm_formats2.lock().unwrap().push(format);
+                        }
+                    },
+                    (),
+                )
+            })
+            .expect("server didn't advertise `wl_shm`");
+
+        let pools = DoubleMemPool::new(&shm).expect("Failed to create a memory pool !");
+
+        //
+        // Get our seat
+        //
+        let seat = manager
+            .instantiate_range(1, 6, NewProxy::implement_dummy)
+            .unwrap();
+
+        //
+        // Keyboard processing
+        //
+        let kbd_clone = cmd_queue.clone();
+        let modifiers_state = Arc::new(Mutex::new(ModifiersState {
+            ctrl: false,
+            alt: false,
+            shift: false,
+            caps_lock: false,
+            logo: false,
+            num_lock: false,
+        }));
+        map_keyboard_auto(&seat, move |event: KbEvent, _| match event {
+            KbEvent::Key {
+                keysym,
+                utf8,
+                state,
+                ..
+            } => match state {
+                KeyState::Pressed => match keysym {
+                    keysyms::XKB_KEY_Escape => kbd_clone.lock().unwrap().push_back(Cmd::Exit),
+                    keysyms::XKB_KEY_c if modifiers_state.lock().unwrap().ctrl => {
+                        kbd_clone.lock().unwrap().push_back(Cmd::Exit)
+                    }
+                    v => kbd_clone.lock().unwrap().push_back(Cmd::Keyboard {
+                        key: v,
+                        key_state: state,
+                        modifiers_state: modifiers_state.lock().unwrap().clone(),
+                        interpreted: utf8,
+                    }),
+                },
+                _ => (),
+            },
+            KbEvent::Modifiers { modifiers } => *modifiers_state.lock().unwrap() = modifiers,
+            _ => (),
+        })
+        .expect("Failed to map keyboard");
+
+        //
+        // Prepare shell so that we can create our shell surface
+        //
+        inner.lock().unwrap().set_shell(Some(
+            if let Ok(layer) = manager.instantiate_exact(
+                1,
+                |layer: NewProxy<zwlr_layer_shell_v1::ZwlrLayerShellV1>| {
+                    layer.implement_closure(|_, _| {}, ())
+                },
+            ) {
+                layer
+            } else {
+                panic!("server didn't advertise `zwlr_layer_shell_v1`");
+            },
+        ));
+
+        event_queue.sync_roundtrip().unwrap();
+
+        //
+        // Cursor processing
+        //
+        let pointer_clone = cmd_queue.clone();
+        seat.get_pointer(move |ptr| {
+            let mut pos: (u32, u32) = (0, 0);
+            let mut vert_scroll: f64 = 0.0;
+            let mut horiz_scroll: f64 = 0.0;
+            let mut btn: u32 = 0;
+            let mut btn_clicked = false;
+            ptr.implement_closure(
+                move |evt, _| match evt {
+                    wl_pointer::Event::Enter {
+                        surface_x,
+                        surface_y,
+                        ..
+                    } => {
+                        pos = (surface_x as u32, surface_y as u32);
+                    }
+                    wl_pointer::Event::Leave { .. } => {
+                        pos = (0, 0);
+                    }
+                    wl_pointer::Event::Motion {
+                        surface_x,
+                        surface_y,
+                        ..
+                    } => {
+                        pos = (surface_x as u32 * scale, surface_y as u32 * scale);
+                    }
+                    wl_pointer::Event::Axis { axis, value, .. } => {
+                        if axis == wl_pointer::Axis::VerticalScroll {
+                            vert_scroll += value;
+                        }
+                    }
+                    wl_pointer::Event::Button { button, state, .. } => match state {
+                        wl_pointer::ButtonState::Released => {
+                            btn = button;
+                            btn_clicked = true;
+                        }
+                        _ => {}
+                    },
+                    wl_pointer::Event::Frame => {
+                        if vert_scroll != 0.0 || horiz_scroll != 0.0 {
+                            pointer_clone.lock().unwrap().push_back(Cmd::MouseScroll {
+                                scroll: (horiz_scroll, vert_scroll),
+                                pos: pos,
+                            });
+                            vert_scroll = 0.0;
+                            horiz_scroll = 0.0;
+                        }
+                        if btn_clicked {
+                            pointer_clone
+                                .lock()
+                                .unwrap()
+                                .push_back(Cmd::MouseClick { btn: btn, pos: pos });
+                            btn_clicked = false;
+                        }
+                    }
+                    _ => {}
+                },
+                (),
+            )
+        })
+        .unwrap();
+
+        display.flush().unwrap();
+
+        App {
+            display: display,
+            event_queue: event_queue,
+            cmd_queue: cmd_queue,
+            pools: pools,
+            widget: None,
+            bg: bg,
+            inner: inner,
+            last_damage: None,
+            last_dim: (0, 0),
+        }
+    }
+}

src/buffer.rs

@@ -0,0 +1,180 @@
+use memmap::MmapMut;
+
+use crate::color::Color;
+
+pub struct Buffer<'a> {
+    buf: &'a mut MmapMut,
+    dimensions: (u32, u32),
+    subdimensions: Option<(u32, u32, u32, u32)>,
+}
+
+impl<'a> Buffer<'a> {
+    pub fn new(buf: &'a mut MmapMut, dimensions: (u32, u32)) -> Buffer {
+        Buffer {
+            buf: buf,
+            dimensions: dimensions,
+            subdimensions: None,
+        }
+    }
+
+    pub fn get_bounds(&self) -> (u32, u32, u32, u32) {
+        if let Some(subdim) = self.subdimensions {
+            subdim
+        } else {
+            (0, 0, self.dimensions.0, self.dimensions.1)
+        }
+    }
+
+    pub fn get_signed_bounds(&self) -> (i32, i32, i32, i32) {
+        if let Some(subdim) = self.subdimensions {
+            (
+                subdim.0 as i32,
+                subdim.1 as i32,
+                subdim.2 as i32,
+                subdim.3 as i32,
+            )
+        } else {
+            (0, 0, self.dimensions.0 as i32, self.dimensions.1 as i32)
+        }
+    }
+
+    pub fn copy_to(&self, other: &mut Buffer, (x, y, width, height): (i32, i32, i32, i32)) {
+        debug_assert!(self.dimensions == other.dimensions);
+        debug_assert!(self.subdimensions.is_none() && other.subdimensions.is_none());
+
+        if x == 0 && width as u32 == self.dimensions.0 {
+            // Full-width copy
+            let offset = y as isize * self.dimensions.0 as isize;
+            let n = height as usize * self.dimensions.0 as usize;
+            unsafe {
+                std::ptr::copy(
+                    (self.buf.as_ptr() as *const u32).offset(offset),
+                    (other.buf.as_mut_ptr() as *mut u32).offset(offset),
+                    n,
+                );
+            }
+        } else {
+            // Row-by-row copy
+            for cur_y in y as isize..(y + height) as isize {
+                let offset = x as isize + cur_y as isize * self.dimensions.0 as isize;
+                unsafe {
+                    std::ptr::copy(
+                        (self.buf.as_ptr() as *const u32).offset(offset),
+                        (other.buf.as_mut_ptr() as *mut u32).offset(offset),
+                        width as usize,
+                    );
+                }
+            }
+        }
+    }
+
+    pub fn subdimensions(
+        &mut self,
+        subdimensions: (u32, u32, u32, u32),
+    ) -> Result<Buffer, ::std::io::Error> {
+        let bounds = self.get_bounds();
+        if subdimensions.0 + subdimensions.2 >= bounds.2
+            || subdimensions.1 + subdimensions.3 >= bounds.3
+        {
+            return Err(::std::io::Error::new(
+                ::std::io::ErrorKind::Other,
+                format!(
+                    "cannot create subdimensions larger than buffer: {:?} > {:?}",
+                    subdimensions, bounds
+                ),
+            ));
+        }
+
+        Ok(Buffer {
+            buf: self.buf,
+            dimensions: self.dimensions,
+            subdimensions: Some((
+                subdimensions.0 + bounds.0,
+                subdimensions.1 + bounds.1,
+                subdimensions.2,
+                subdimensions.3,
+            )),
+        })
+    }
+
+    pub fn offset(&mut self, offset: (u32, u32)) -> Result<Buffer, ::std::io::Error> {
+        let bounds = self.get_bounds();
+        if offset.0 > bounds.2 || offset.1 > bounds.3 {
+            return Err(::std::io::Error::new(
+                ::std::io::ErrorKind::Other,
+                format!(
+                    "cannot create offset outside buffer: {:?} > {:?}",
+                    offset, bounds
+                ),
+            ));
+        }
+
+        Ok(Buffer {
+            buf: self.buf,
+            dimensions: self.dimensions,
+            subdimensions: Some((
+                offset.0 + bounds.0,
+                offset.1 + bounds.1,
+                bounds.2 - offset.0,
+                bounds.3 - offset.1,
+            )),
+        })
+    }
+
+    pub fn memset(&mut self, c: &Color) {
+        if let Some(subdim) = self.subdimensions {
+            unsafe {
+                let ptr = self.buf.as_mut_ptr();
+                for y in subdim.1..(subdim.1 + subdim.3) {
+                    for x in subdim.0..(subdim.0 + subdim.2) {
+                        *((ptr as *mut u32).offset((x + y * self.dimensions.0) as isize)) =
+                            c.as_argb8888();
+                    }
+                }
+            }
+        } else {
+            unsafe {
+                let ptr = self.buf.as_mut_ptr();
+                for p in 0..(self.dimensions.0 * self.dimensions.1) {
+                    *((ptr as *mut u32).offset(p as isize)) = c.as_argb8888();
+                }
+            }
+        }
+    }
+
+    pub fn put(&mut self, pos: (u32, u32), c: &Color) -> Result<(), ::std::io::Error> {
+        let true_pos = if let Some(subdim) = self.subdimensions {
+            if pos.0 >= subdim.2 || pos.1 >= subdim.3 {
+                return Err(::std::io::Error::new(
+                    ::std::io::ErrorKind::Other,
+                    format!(
+                        "put({:?}) is not within subdimensions of buffer ({:?})",
+                        pos, subdim
+                    ),
+                ));
+            }
+            (pos.0 + subdim.0, pos.1 + subdim.1)
+        } else {
+            if pos.0 >= self.dimensions.0 || pos.1 >= self.dimensions.1 {
+                return Err(::std::io::Error::new(
+                    ::std::io::ErrorKind::Other,
+                    format!(
+                        "put({:?}) is not within dimensions of buffer ({:?})",
+                        pos, self.dimensions
+                    ),
+                ));
+            }
+            pos
+        };
+
+        unsafe {
+            let ptr = self
+                .buf
+                .as_mut_ptr()
+                .offset(4 * (true_pos.0 + (true_pos.1 * self.dimensions.0)) as isize);
+            *(ptr as *mut u32) = c.as_argb8888();
+        };
+
+        Ok(())
+    }
+}

src/cmd.rs

@@ -0,0 +1,22 @@
+use smithay_client_toolkit::keyboard::{KeyState, ModifiersState};
+
+pub enum Cmd {
+    Exit,
+    Draw,
+    ForceDraw,
+    ToggleVisible,
+    MouseClick {
+        btn: u32,
+        pos: (u32, u32),
+    },
+    MouseScroll {
+        scroll: (f64, f64),
+        pos: (u32, u32),
+    },
+    Keyboard {
+        key: u32,
+        key_state: KeyState,
+        modifiers_state: ModifiersState,
+        interpreted: Option<String>,
+    },
+}

src/color.rs

@@ -0,0 +1,71 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Serialize, Deserialize, Debug, Clone, Copy, Default)]
+pub struct Color {
+    red: f32,
+    green: f32,
+    blue: f32,
+    opacity: f32,
+}
+
+impl Color {
+    pub fn new(red: f32, green: f32, blue: f32, opacity: f32) -> Color {
+        let (red, green, blue, opacity) = clamp(red, green, blue, opacity);
+        Color {
+            red,
+            green,
+            blue,
+            opacity,
+        }
+    }
+
+    pub fn blend(&self, other: &Color, ratio: f32) -> Color {
+        let ratio = clamp_f32(ratio, 0.0, 1.0);
+
+        Color {
+            red: blend_f32(self.red, other.red, ratio),
+            green: blend_f32(self.green, other.green, ratio),
+            blue: blend_f32(self.blue, other.blue, ratio),
+            opacity: blend_f32(self.opacity, other.opacity, ratio),
+        }
+    }
+
+    #[inline]
+    pub fn as_argb8888(&self) -> u32 {
+        ((255.0 * self.opacity) as u32 & 0xFF) << 24
+            | ((255.0 * self.red) as u32 & 0xFF) << 16
+            | ((255.0 * self.green) as u32 & 0xFF) << 8
+            | ((255.0 * self.blue) as u32 & 0xFF)
+    }
+}
+
+#[inline]
+fn clamp(r: f32, g: f32, b: f32, o: f32) -> (f32, f32, f32, f32) {
+    clamp_naive(r, g, b, o)
+}
+
+#[inline]
+fn clamp_naive(r: f32, g: f32, b: f32, o: f32) -> (f32, f32, f32, f32) {
+    (
+        clamp_f32(r, 0.0, 1.0),
+        clamp_f32(g, 0.0, 1.0),
+        clamp_f32(b, 0.0, 1.0),
+        clamp_f32(o, 0.0, 1.0),
+    )
+}
+
+#[inline]
+fn clamp_f32(v: f32, a: f32, b: f32) -> f32 {
+    if v > b {
+        b
+    } else if v < a {
+        a
+    } else {
+        v
+    }
+}
+
+#[inline]
+fn blend_f32(a: f32, b: f32, r: f32) -> f32 {
+    a + ((b - a) * r)
+}

src/config.rs

@@ -0,0 +1,227 @@
+use crate::cmd::Cmd;
+use crate::color::Color;
+use crate::widget;
+use crate::widgets;
+use serde::{Deserialize, Serialize};
+use std::default::Default;
+use std::sync::mpsc::Sender;
+
+#[derive(Serialize, Deserialize, Debug)]
+#[serde(rename_all = "camelCase")]
+pub enum Widget {
+    Margin {
+        margins: (u32, u32, u32, u32),
+        widget: Box<Widget>,
+    },
+    Fixed {
+        width: u32,
+        height: u32,
+        widget: Box<Widget>,
+    },
+    HorizontalLayout(Vec<Box<Widget>>),
+    VerticalLayout(Vec<Box<Widget>>),
+    Clock {
+        font_size: f32,
+    },
+    Date {
+        font_size: f32,
+    },
+    Calendar {
+        font_size: f32,
+        sections: u32,
+    },
+    Launcher {
+        font_size: f32,
+        length: u32,
+        #[serde(default)]
+        app_opener: String,
+        #[serde(default)]
+        term_opener: String,
+        #[serde(default)]
+        url_opener: String,
+    },
+    Battery {
+        font_size: f32,
+        length: u32,
+    },
+    Backlight {
+        font_size: f32,
+        length: u32,
+    },
+    #[cfg(feature = "pulseaudio-widget")]
+    PulseAudio {
+        font_size: f32,
+        length: u32,
+    },
+    #[cfg(feature = "alsa-widget")]
+    AlsaSound {
+        font_size: f32,
+        length: u32,
+    },
+}
+
+impl Widget {
+    pub fn construct(self, tx: Sender<Cmd>) -> Option<Box<dyn widget::Widget + Send>> {
+        match self {
+            Widget::Margin { margins, widget } => match widget.construct(tx.clone()) {
+                Some(w) => Some(widget::Margin::new(margins, w)),
+                None => None,
+            },
+            Widget::Fixed {
+                width,
+                height,
+                widget,
+            } => match widget.construct(tx.clone()) {
+                Some(w) => Some(widget::Fixed::new((width, height), w)),
+                None => None,
+            },
+            Widget::HorizontalLayout(widgets) => Some(widget::HorizontalLayout::new(
+                widgets
+                    .into_iter()
+                    .map(|x| x.construct(tx.clone()))
+                    .filter(|x| x.is_some())
+                    .map(|x| x.unwrap())
+                    .collect(),
+            )),
+            Widget::VerticalLayout(widgets) => Some(widget::VerticalLayout::new(
+                widgets
+                    .into_iter()
+                    .map(|x| x.construct(tx.clone()))
+                    .filter(|x| x.is_some())
+                    .map(|x| x.unwrap())
+                    .collect(),
+            )),
+            Widget::Clock { font_size } => Some(widgets::clock::Clock::new(font_size, tx.clone())),
+            Widget::Date { font_size } => Some(widgets::date::Date::new(font_size)),
+            Widget::Calendar {
+                font_size,
+                sections,
+            } => Some(widgets::calendar::Calendar::new(font_size, sections)),
+            Widget::Launcher {
+                font_size,
+                length,
+                app_opener,
+                term_opener,
+                url_opener,
+            } => Some(widgets::launcher::Launcher::new(
+                font_size,
+                length,
+                tx.clone(),
+                app_opener,
+                term_opener,
+                if url_opener.len() == 0 {
+                    "xdg_open ".to_string()
+                } else {
+                    url_opener
+                },
+            )),
+            Widget::Battery { font_size, length } => {
+                match widgets::battery::UpowerBattery::new(font_size, length, tx.clone()) {
+                    Ok(w) => Some(w),
+                    Err(_) => None,
+                }
+            }
+            Widget::Backlight { font_size, length } => {
+                match widgets::backlight::Backlight::new(font_size, length) {
+                    Ok(w) => Some(w),
+                    Err(_) => None,
+                }
+            }
+            #[cfg(feature = "pulseaudio-widget")]
+            Widget::PulseAudio { font_size, length } => {
+                match widgets::audio::PulseAudio::new(font_size, length, tx.clone()) {
+                    Ok(w) => Some(w),
+                    Err(_) => None,
+                }
+            }
+            #[cfg(feature = "alsa-widget")]
+            Widget::AlsaSound { font_size, length } => {
+                match widgets::audio::Alsa::new(font_size, length) {
+                    Ok(w) => Some(w),
+                    Err(_) => None,
+                }
+            }
+        }
+    }
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+#[serde(rename_all = "camelCase")]
+pub enum OutputMode {
+    All,
+    Active,
+}
+
+impl Default for OutputMode {
+    fn default() -> Self {
+        OutputMode::Active
+    }
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+#[serde(rename_all = "camelCase")]
+pub struct Config {
+    pub output_mode: OutputMode,
+    pub scale: u32,
+    pub background: Color,
+    pub widget: Widget,
+}
+
+impl Default for Config {
+    fn default() -> Self {
+        Config {
+            widget: Widget::Margin {
+                margins: (20, 20, 20, 20),
+                widget: Box::new(Widget::VerticalLayout(vec![
+                    Box::new(Widget::HorizontalLayout(vec![
+                        Box::new(Widget::Margin {
+                            margins: (0, 88, 0, 32),
+                            widget: Box::new(Widget::VerticalLayout(vec![
+                                Box::new(Widget::Date { font_size: 64.0 }),
+                                Box::new(Widget::Clock { font_size: 256.0 }),
+                            ])),
+                        }),
+                        Box::new(Widget::VerticalLayout(vec![
+                            Box::new(Widget::Margin {
+                                margins: (0, 0, 0, 8),
+                                widget: Box::new(Widget::Battery {
+                                    font_size: 24.0,
+                                    length: 600,
+                                }),
+                            }),
+                            Box::new(Widget::Margin {
+                                margins: (0, 0, 0, 8),
+                                widget: Box::new(Widget::Backlight {
+                                    font_size: 24.0,
+                                    length: 600,
+                                }),
+                            }),
+                            #[cfg(feature = "pulseaudio-widget")]
+                            Box::new(Widget::Margin {
+                                margins: (0, 0, 0, 8),
+                                widget: Box::new(Widget::PulseAudio {
+                                    font_size: 24.0,
+                                    length: 600,
+                                }),
+                            }),
+                        ])),
+                    ])),
+                    Box::new(Widget::Calendar {
+                        font_size: 16.0,
+                        sections: 3,
+                    }),
+                    Box::new(Widget::Launcher {
+                        font_size: 32.0,
+                        length: 1200,
+                        app_opener: "".to_string(),
+                        term_opener: "".to_string(),
+                        url_opener: "".to_string(),
+                    }),
+                ])),
+            },
+            output_mode: Default::default(),
+            scale: 1,
+            background: Color::new(0.0, 0.0, 0.0, 0.9),
+        }
+    }
+}

src/configfmt.rs

@@ -0,0 +1,61 @@
+use serde::{de::DeserializeOwned, Serialize};
+use std::io::BufRead;
+
+pub enum ConfigFmt {
+    #[cfg(feature = "yaml-cfg")]
+    Yaml,
+    #[cfg(feature = "json-cfg")]
+    Json,
+}
+
+pub const CONFIG_NAMES: &'static [&'static str] = &[
+    #[cfg(feature = "yaml-cfg")]
+    "config.yaml",
+    #[cfg(feature = "json-cfg")]
+    "config.json",
+];
+
+impl ConfigFmt {
+    #[inline]
+    pub fn new(ext: &str) -> Option<Self> {
+        match ext {
+            #[cfg(feature = "yaml-cfg")]
+            "yaml" => Some(ConfigFmt::Yaml),
+            #[cfg(feature = "json-cfg")]
+            "json" => Some(ConfigFmt::Json),
+            _ => None,
+        }
+    }
+    #[inline]
+    pub fn from_reader<B: BufRead, T: DeserializeOwned>(&self, r: B) -> T {
+        match self {
+            #[cfg(feature = "yaml-cfg")]
+            ConfigFmt::Yaml => serde_yaml::from_reader(r).unwrap(),
+            #[cfg(feature = "json-cfg")]
+            ConfigFmt::Json => serde_json::from_reader(r).unwrap(),
+        }
+    }
+    #[inline]
+    pub fn to_string<T: Serialize + ?Sized>(&self, src: &T) -> String {
+        match self {
+            #[cfg(feature = "yaml-cfg")]
+            ConfigFmt::Yaml => serde_yaml::to_string(&src).unwrap(),
+            #[cfg(feature = "json-cfg")]
+            ConfigFmt::Json => serde_json::to_string_pretty(&src).unwrap(),
+        }
+    }
+}
+
+impl Default for ConfigFmt {
+    fn default() -> Self {
+        // attributes require curly braces to work
+        #[cfg(feature = "yaml-cfg")]
+        {
+            ConfigFmt::Yaml
+        }
+        #[cfg(all(feature = "json-cfg", not(feature = "yaml-cfg")))]
+        {
+            ConfigFmt::Json
+        }
+    }
+}

src/desktop.rs

@@ -0,0 +1,101 @@
+extern crate ini;
+use ini::{Ini, ParseOption};
+use std::cmp::Ordering;
+use std::env;
+use std::error::Error;
+use std::fs;
+use std::io::Error as io_error;
+use std::io::ErrorKind;
+
+#[derive(Clone, Debug, Eq)]
+pub struct Desktop {
+    pub entry_type: String,
+    pub name: String,
+    pub no_display: bool,
+    pub hidden: bool,
+    pub exec: Option<String>,
+    pub url: Option<String>,
+    pub term: bool,
+}
+
+impl Desktop {
+    fn parse(f: &str) -> Result<Desktop, Box<dyn Error>> {
+        let file = Ini::load_from_file_opt(
+            f,
+            ParseOption {
+                enabled_quote: false,
+                enabled_escape: false,
+            },
+        )?;
+        match file.section(Some("Desktop Entry")) {
+            Some(desktop) => Ok(Desktop {
+                entry_type: desktop.get("Type").unwrap_or(&"".to_string()).to_string(),
+                name: desktop.get("Name").unwrap_or(&"".to_string()).to_string(),
+                term: desktop.get("Terminal").unwrap_or(&"".to_string()) == "true",
+                no_display: desktop.get("NoDisplay").unwrap_or(&"".to_string()) == "true",
+                hidden: desktop.get("Hidden").unwrap_or(&"".to_string()) == "true",
+                exec: desktop.get("Exec").map(|x| x.to_string()),
+                url: desktop.get("URL").map(|x| x.to_string()),
+            }),
+            None => Err(Box::new(io_error::new(
+                ErrorKind::NotFound,
+                "no desktop entry in file",
+            ))),
+        }
+    }
+
+    fn parse_dir(d: &str) -> Result<Vec<Desktop>, Box<dyn Error>> {
+        let mut files: Vec<Desktop> = Vec::with_capacity(16);
+        for entry in fs::read_dir(d)? {
+            let entry = entry?;
+            let path = entry.path();
+
+            if let Ok(d) = Desktop::parse(path.to_str().unwrap()) {
+                files.push(d)
+            }
+        }
+
+        Ok(files)
+    }
+}
+
+impl Ord for Desktop {
+    fn cmp(&self, other: &Self) -> Ordering {
+        self.name.cmp(&other.name)
+    }
+}
+
+impl PartialOrd for Desktop {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+impl PartialEq for Desktop {
+    fn eq(&self, other: &Self) -> bool {
+        self.name == other.name
+    }
+}
+
+pub fn load_desktop_files() -> Vec<Desktop> {
+    let home = env::var_os("HOME").unwrap().into_string().unwrap();
+
+    let xdg_data_home = match env::var_os("XDG_DATA_HOME") {
+        Some(s) => s.into_string().unwrap(),
+        None => format!("{}/.local/share", home).to_string(),
+    };
+    let xdg_data_dirs = match env::var_os("XDG_DATA_DIRS") {
+        Some(s) => s.into_string().unwrap(),
+        None => "/usr/local/share:/usr/share".to_string(),
+    };
+
+    std::iter::once(xdg_data_home.as_str())
+        .chain(xdg_data_dirs.split(":"))
+        .map(|p| Desktop::parse_dir(&format!("{}/applications", p)))
+        .filter_map(Result::ok)
+        .flatten()
+        .filter(|d| {
+            !d.hidden && !d.no_display && (d.entry_type == "Application" || d.entry_type == "Link")
+        })
+        .collect()
+}

src/doublemempool.rs

@@ -0,0 +1,38 @@
+use smithay_client_toolkit::utils::MemPool;
+use wayland_client::protocol::wl_shm;
+
+pub struct DoubleMemPool {
+    pool1: MemPool,
+    pool2: MemPool,
+    switch: bool,
+}
+
+impl DoubleMemPool {
+    pub fn new(shm: &wl_shm::WlShm) -> ::std::io::Result<DoubleMemPool> {
+        Ok(DoubleMemPool {
+            pool1: MemPool::new(shm, move || {})?,
+            pool2: MemPool::new(shm, move || {})?,
+            switch: false,
+        })
+    }
+
+    pub fn pool(&mut self) -> Option<(&mut MemPool, &mut MemPool)> {
+        let switch = self.switch;
+        self.switch = !self.switch;
+        let (last, cur) = if !switch {
+            (&mut self.pool2, &mut self.pool1)
+        } else {
+            (&mut self.pool1, &mut self.pool2)
+        };
+
+        if cur.is_used() {
+            None
+        } else {
+            Some((last, cur))
+        }
+    }
+
+    pub fn never_mind(&mut self) {
+        self.switch = !self.switch;
+    }
+}

src/draw.rs

@@ -0,0 +1,263 @@
+use crate::buffer::Buffer;
+use crate::color::Color;
+
+use std::collections::HashMap;
+
+use lazy_static::lazy_static;
+use rusttype::{point, Font as RustFont, Scale};
+
+pub static DEJAVUSANS_MONO_FONT_DATA: &'static [u8] =
+    include_bytes!("../fonts/dejavu/DejaVuSansMono.ttf");
+pub static ROBOTO_REGULAR_FONT_DATA: &'static [u8] = include_bytes!("../fonts/Roboto-Regular.ttf");
+
+lazy_static! {
+    pub static ref DEJAVUSANS_MONO: RustFont<'static> =
+        RustFont::from_bytes(DEJAVUSANS_MONO_FONT_DATA as &[u8])
+            .expect("error constructing DejaVuSansMono");
+    pub static ref ROBOTO_REGULAR: RustFont<'static> =
+        RustFont::from_bytes(ROBOTO_REGULAR_FONT_DATA as &[u8])
+            .expect("error constructing Roboto-Regular");
+}
+
+struct CachedGlyph {
+    dimensions: (u32, u32),
+    origin: (i32, i32),
+    render: Vec<f32>,
+}
+
+impl CachedGlyph {
+    fn new(font: &RustFont, size: f32, ch: char) -> CachedGlyph {
+        let scale = Scale::uniform(size);
+        let v_metrics = font.v_metrics(scale);
+        let glyph = font
+            .glyph(ch)
+            .scaled(scale)
+            .positioned(point(0.0, v_metrics.ascent));
+
+        if let Some(bounding_box) = glyph.pixel_bounding_box() {
+            let origin = (bounding_box.min.x, bounding_box.min.y);
+
+            let dimensions = (
+                (bounding_box.max.x - bounding_box.min.x) as u32,
+                (bounding_box.max.y - bounding_box.min.y) as u32,
+            );
+            let mut render = vec![0.0; (dimensions.0 * dimensions.1) as usize];
+            glyph.draw(|x, y, o| {
+                let pos = x + (y * dimensions.0);
+                render[pos as usize] = o;
+            });
+            CachedGlyph {
+                origin: origin,
+                dimensions: dimensions,
+                render: render,
+            }
+        } else {
+            CachedGlyph {
+                origin: (0, 0),
+                dimensions: ((size / 4.0) as u32, 0),
+                render: Vec::new(),
+            }
+        }
+    }
+
+    fn draw(&self, buf: &mut Buffer, pos: (i32, i32), bg: &Color, c: &Color) {
+        let mut x = 0;
+        let mut y = 0;
+        for v in &self.render {
+            let _ = buf.put(
+                (
+                    (x + pos.0 + self.origin.0) as u32,
+                    (y + pos.1 + self.origin.1) as u32,
+                ),
+                &bg.blend(&c, *v),
+            );
+
+            if x == self.dimensions.0 as i32 - 1 {
+                y += 1;
+                x = 0;
+            } else {
+                x += 1;
+            }
+        }
+    }
+}
+
+pub struct Font {
+    glyphs: HashMap<char, CachedGlyph>,
+    font: &'static RustFont<'static>,
+    size: f32,
+}
+
+impl Font {
+    pub fn new(font: &'static RustFont, size: f32) -> Font {
+        Font {
+            glyphs: HashMap::new(),
+            font: font,
+            size: size,
+        }
+    }
+
+    pub fn add_str_to_cache(&mut self, s: &str) {
+        for ch in s.chars() {
+            if self.glyphs.get(&ch).is_none() {
+                let glyph = CachedGlyph::new(self.font, self.size, ch);
+                self.glyphs.insert(ch, glyph);
+            }
+        }
+    }
+
+    pub fn draw_text(
+        &self,
+        buf: &mut Buffer,
+        bg: &Color,
+        c: &Color,
+        s: &str,
+    ) -> Result<(u32, u32), ::std::io::Error> {
+        let mut x_off = 0;
+        let mut off = 0;
+        let mut glyphs = Vec::with_capacity(s.len());
+        for ch in s.chars() {
+            let glyph = match self.glyphs.get(&ch) {
+                Some(glyph) => glyph,
+                None => {
+                    return Err(::std::io::Error::new(
+                        ::std::io::ErrorKind::Other,
+                        format!("glyph for {:} not in cache", ch),
+                    ))
+                }
+            };
+            glyphs.push(glyph);
+            if glyph.origin.1 < off {
+                off = glyph.origin.1
+            }
+        }
+        for glyph in glyphs {
+            glyph.draw(buf, (x_off, -off), bg, c);
+            x_off += glyph.dimensions.0 as i32 + glyph.origin.0;
+        }
+
+        Ok((x_off as u32, self.size as u32))
+    }
+
+    pub fn auto_draw_text(
+        &mut self,
+        buf: &mut Buffer,
+        bg: &Color,
+        c: &Color,
+        s: &str,
+    ) -> Result<(u32, u32), ::std::io::Error> {
+        self.add_str_to_cache(s);
+        self.draw_text(buf, bg, c, s)
+    }
+
+    pub fn draw_text_fixed_width(
+        &self,
+        buf: &mut Buffer,
+        bg: &Color,
+        c: &Color,
+        distances: &[u32],
+        s: &str,
+    ) -> Result<(u32, u32), ::std::io::Error> {
+        let mut x_off = 0;
+        let mut off = 0;
+        let mut glyphs = Vec::with_capacity(s.len());
+        for ch in s.chars() {
+            let glyph = match self.glyphs.get(&ch) {
+                Some(glyph) => glyph,
+                None => {
+                    return Err(::std::io::Error::new(
+                        ::std::io::ErrorKind::Other,
+                        format!("glyph for {:} not in cache", ch),
+                    ))
+                }
+            };
+            glyphs.push(glyph);
+            if glyph.origin.1 < off {
+                off = glyph.origin.1
+            }
+        }
+        for (idx, glyph) in glyphs.into_iter().enumerate() {
+            glyph.draw(buf, (x_off, -off), bg, c);
+            x_off += distances[idx] as i32;
+        }
+
+        Ok((x_off as u32, self.size as u32))
+    }
+
+    pub fn draw_text_individual_colors(
+        &self,
+        buf: &mut Buffer,
+        bg: &Color,
+        color: &[Color],
+        s: &str,
+    ) -> Result<(u32, u32), ::std::io::Error> {
+        let mut x_off = 0;
+        let mut off = 0;
+        let mut glyphs = Vec::with_capacity(s.len());
+        for ch in s.chars() {
+            let glyph = match self.glyphs.get(&ch) {
+                Some(glyph) => glyph,
+                None => {
+                    return Err(::std::io::Error::new(
+                        ::std::io::ErrorKind::Other,
+                        format!("glyph for {:} not in cache", ch),
+                    ))
+                }
+            };
+            glyphs.push(glyph);
+            if glyph.origin.1 < off {
+                off = glyph.origin.1
+            }
+        }
+        for (idx, glyph) in glyphs.into_iter().enumerate() {
+            glyph.draw(buf, (x_off, -off), bg, &color[idx]);
+            x_off += glyph.dimensions.0 as i32 + glyph.origin.0;
+        }
+
+        Ok((x_off as u32, self.size as u32))
+    }
+
+    pub fn auto_draw_text_individual_colors(
+        &mut self,
+        buf: &mut Buffer,
+        bg: &Color,
+        color: &[Color],
+        s: &str,
+    ) -> Result<(u32, u32), ::std::io::Error> {
+        self.add_str_to_cache(s);
+        self.draw_text_individual_colors(buf, bg, color, s)
+    }
+}
+
+pub fn draw_box(buf: &mut Buffer, c: &Color, dim: (u32, u32)) -> Result<(), ::std::io::Error> {
+    for x in 0..dim.0 {
+        let _ = buf.put((x, 0), c);
+        let _ = buf.put((x, dim.1 - 1), c);
+    }
+    for y in 0..dim.1 {
+        buf.put((0, y), c)?;
+        buf.put((dim.0 - 1, y), c)?;
+    }
+
+    Ok(())
+}
+
+pub fn draw_bar(
+    buf: &mut Buffer,
+    color: &Color,
+    length: u32,
+    height: u32,
+    fill: f32,
+) -> Result<(), ::std::io::Error> {
+    let mut fill_pos = ((length as f32) * fill) as u32;
+    if fill_pos > length {
+        fill_pos = length;
+    }
+    for y in 0..height {
+        for x in 0..fill_pos {
+            let _ = buf.put((x, y), color);
+        }
+    }
+
+    Ok(())
+}

src/main.rs

@@ -0,0 +1,316 @@
+use std::env;
+use std::fs::File;
+use std::io::{BufRead, BufReader, Read, Write};
+use std::os::unix::io::AsRawFd;
+use std::os::unix::net::{UnixListener, UnixStream};
+use std::sync::mpsc::channel;
+
+use nix::poll::{poll, PollFd, PollFlags};
+use os_pipe::pipe;
+
+mod app;
+mod buffer;
+mod cmd;
+mod color;
+mod config;
+mod configfmt;
+mod desktop;
+mod doublemempool;
+mod draw;
+mod widget;
+mod widgets;
+
+use app::{App, OutputMode};
+use cmd::Cmd;
+use config::Config;
+use configfmt::ConfigFmt;
+
+enum Mode {
+    Start,
+    Daemonize,
+    StartOrKill,
+    ToggleVisible,
+    PrintConfig(ConfigFmt),
+}
+
+fn main() {
+    let socket_path = match env::var("XDG_RUNTIME_DIR") {
+        Ok(dir) => dir + "/wldash",
+        Err(_) => "/tmp/wldash".to_string(),
+    };
+    let config_home = match env::var("XDG_CONFIG_HOME") {
+        Ok(dir) => dir + "/wldash",
+        Err(_) => match env::var("HOME") {
+            Ok(home) => home + "/.config/wldash",
+            Err(_) => panic!("unable to find user folder"),
+        },
+    };
+
+    // From all existing files take the first readable one and write it's extension to `ext`
+    let mut ext = [0x0; 8];
+    let file = configfmt::CONFIG_NAMES
+        .iter()
+        .map(|name| std::path::Path::new(&config_home).join(name))
+        .filter_map(|path| {
+            match File::open(&path) {
+                Ok(file) => {
+                    let e = path.extension().and_then(|e| e.to_str())?;
+                    let len = e.len();
+                    let from = len.saturating_sub(8); // the longest possible extension
+                    ext[0..len - from].copy_from_slice(&e.as_bytes()[from..]);
+                    Some(file)
+                }
+                Err(_) => None,
+            }
+        })
+        .next();
+
+    let fmt = std::str::from_utf8(&ext)
+        .ok()
+        .and_then(ConfigFmt::new)
+        .unwrap_or_default();
+
+    let config: Config = file
+        .map(|f| fmt.from_reader(BufReader::new(f)))
+        .unwrap_or_default();
+
+    let scale = config.scale;
+
+    let mut args = env::args();
+    let _ = args.next();
+    let mode = match args.next() {
+        Some(arg) => match arg.as_str() {
+            "start" => Mode::Daemonize,
+            "start-or-kill" => Mode::StartOrKill,
+            "toggle-visible" => Mode::ToggleVisible,
+            "print-config" => Mode::PrintConfig(fmt),
+            s => {
+                let p = "print-config-";
+                let l = p.len();
+                let fmt = if s.starts_with(p) {
+                    ConfigFmt::new(&s[l..])
+                } else {
+                    None
+                };
+                if let Some(fmt) = fmt {
+                    Mode::PrintConfig(fmt)
+                } else {
+                    eprintln!("unsupported sub-command {}", s);
+                    std::process::exit(1);
+                }
+            }
+        },
+        None => Mode::Start,
+    };
+    if let Some(_) = args.next() {
+        // total = args.count + 2 (the two we skipped + the rest)
+        eprintln!("expected 0 or 1 arguments, got {}", args.count() + 2);
+        std::process::exit(1);
+    }
+
+    let mut daemon = false;
+
+    match mode {
+        Mode::ToggleVisible => {
+            if let Ok(mut socket) = UnixStream::connect(socket_path.clone()) {
+                socket.write_all(b"toggle_visible\n").unwrap();
+                return;
+            };
+            eprintln!("wldash is not running");
+            std::process::exit(1);
+        }
+        Mode::StartOrKill => {
+            if let Ok(mut socket) = UnixStream::connect(socket_path.clone()) {
+                socket.write_all(b"kill\n").unwrap();
+                return;
+            };
+        }
+        Mode::Start => {
+            if let Ok(_) = UnixStream::connect(socket_path.clone()) {
+                eprintln!("wldash is already running");
+                std::process::exit(1);
+            };
+        }
+        Mode::Daemonize => {
+            if let Ok(_) = UnixStream::connect(socket_path.clone()) {
+                eprintln!("wldash is already running");
+                std::process::exit(1);
+            };
+            daemon = true;
+        }
+        Mode::PrintConfig(fmt) => {
+            println!("{}", fmt.to_string(&config));
+            std::process::exit(0);
+        }
+    }
+
+    let _ = std::fs::remove_file(socket_path.clone());
+    let listener = UnixListener::bind(socket_path.clone()).unwrap();
+
+    let output_mode = match config.output_mode {
+        config::OutputMode::All => OutputMode::All,
+        config::OutputMode::Active => OutputMode::Active,
+    };
+
+    let background = config.background;
+
+    let (tx_draw, rx_draw) = channel();
+    let tx_draw_mod = tx_draw.clone();
+    let (mod_tx, mod_rx) = channel();
+    std::thread::spawn(move || {
+        // Print, write to a file, or send to an HTTP server.
+        match config.widget.construct(tx_draw_mod) {
+            Some(w) => mod_tx.send(w).unwrap(),
+            None => panic!("no widget configured"),
+        }
+    });
+
+    let mut app = App::new(tx_draw, output_mode, background, scale);
+    if daemon {
+        app.hide();
+    } else {
+        app.show();
+    }
+    let widget = mod_rx.recv().unwrap();
+    app.set_widget(widget).unwrap();
+
+    let (mut rx_pipe, mut tx_pipe) = pipe().unwrap();
+    let ipc_pipe = tx_pipe.try_clone().unwrap();
+
+    let worker_queue = app.cmd_queue();
+    let _ = std::thread::Builder::new()
+        .name("cmd_proxy".to_string())
+        .spawn(move || loop {
+            let cmd = rx_draw.recv().unwrap();
+            worker_queue.lock().unwrap().push_back(cmd);
+            tx_pipe.write_all(&[0x1]).unwrap();
+        });
+
+    let ipc_queue = app.cmd_queue();
+    let _ = std::thread::Builder::new()
+        .name("ipc_server".to_string())
+        .spawn(move || loop {
+            for stream in listener.incoming() {
+                match stream {
+                    Ok(stream) => {
+                        let client_queue = ipc_queue.clone();
+                        let mut client_pipe = ipc_pipe.try_clone().unwrap();
+                        let _ = std::thread::Builder::new()
+                            .name("ipc_client".to_string())
+                            .spawn(move || {
+                                let r = BufReader::new(stream);
+                                for line in r.lines() {
+                                    match line {
+                                        Ok(v) => match v.as_str() {
+                                            "kill" => {
+                                                client_queue.lock().unwrap().push_back(Cmd::Exit)
+                                            }
+                                            "toggle_visible" => client_queue
+                                                .lock()
+                                                .unwrap()
+                                                .push_back(Cmd::ToggleVisible),
+                                            v => eprintln!("unknown command: {}", v),
+                                        },
+                                        Err(_) => return,
+                                    }
+                                    client_pipe.write_all(&[0x1]).unwrap();
+                                }
+                            });
+                    }
+                    Err(_) => break,
+                }
+            }
+        });
+
+    let mut fds = [
+        PollFd::new(app.event_queue().get_connection_fd(), PollFlags::POLLIN),
+        PollFd::new(rx_pipe.as_raw_fd(), PollFlags::POLLIN),
+    ];
+
+    app.cmd_queue().lock().unwrap().push_back(Cmd::Draw);
+
+    let mut visible = !daemon;
+    let q = app.cmd_queue();
+    loop {
+        let cmd = q.lock().unwrap().pop_front();
+        match cmd {
+            Some(cmd) => match cmd {
+                Cmd::Draw => {
+                    app.redraw(false).expect("Failed to draw");
+                    app.flush_display();
+                }
+                Cmd::ForceDraw => {
+                    app.redraw(true).expect("Failed to draw");
+                    app.flush_display();
+                }
+                Cmd::MouseClick { btn, pos } => {
+                    app.get_widget().mouse_click(btn, pos);
+                    q.lock().unwrap().push_back(Cmd::Draw);
+                }
+                Cmd::MouseScroll { scroll, pos } => {
+                    app.get_widget().mouse_scroll(scroll, pos);
+                    q.lock().unwrap().push_back(Cmd::Draw);
+                }
+                Cmd::Keyboard {
+                    key,
+                    key_state,
+                    modifiers_state,
+                    interpreted,
+                } => {
+                    app.get_widget()
+                        .keyboard_input(key, modifiers_state, key_state, interpreted);
+                    q.lock().unwrap().push_back(Cmd::Draw);
+                }
+                Cmd::ToggleVisible => {
+                    visible = !visible;
+                    if visible {
+                        app.get_widget().enter();
+                        app.show();
+                    } else {
+                        app.hide();
+                        app.get_widget().leave();
+                    }
+                    app.flush_display();
+                }
+                Cmd::Exit => {
+                    if daemon {
+                        visible = false;
+                        app.hide();
+                        app.get_widget().leave();
+                        app.flush_display();
+                    } else {
+                        let _ = std::fs::remove_file(socket_path);
+                        return;
+                    }
+                }
+            },
+            None => {
+                app.flush_display();
+
+                poll(&mut fds, -1).unwrap();
+
+                if fds[0].revents().unwrap().contains(PollFlags::POLLIN) {
+                    if let Some(guard) = app.event_queue().prepare_read() {
+                        if let Err(e) = guard.read_events() {
+                            if e.kind() != ::std::io::ErrorKind::WouldBlock {
+                                eprintln!(
+                                    "Error while trying to read from the wayland socket: {:?}",
+                                    e
+                                );
+                            }
+                        }
+                    }
+
+                    app.event_queue()
+                        .dispatch_pending()
+                        .expect("Failed to dispatch all messages.");
+                }
+
+                if fds[1].revents().unwrap().contains(PollFlags::POLLIN) {
+                    let mut v = [0x00];
+                    rx_pipe.read_exact(&mut v).unwrap();
+                }
+            }
+        }
+    }
+}

src/widget.rs

@@ -0,0 +1,399 @@
+use crate::buffer::Buffer;
+use crate::color::Color;
+use chrono::{DateTime, Local};
+pub use smithay_client_toolkit::keyboard::{KeyState, ModifiersState};
+
+pub struct DrawContext<'a> {
+    pub buf: &'a mut Buffer<'a>,
+    pub bg: &'a Color,
+    pub time: &'a DateTime<Local>,
+    pub force: bool,
+}
+
+#[derive(Debug)]
+pub struct DrawReport {
+    pub width: u32,
+    pub height: u32,
+    pub damage: Vec<(i32, i32, i32, i32)>,
+    pub full_damage: bool,
+}
+
+impl DrawReport {
+    pub fn empty(width: u32, height: u32) -> DrawReport {
+        DrawReport {
+            width,
+            height,
+            damage: Vec::new(),
+            full_damage: false,
+        }
+    }
+}
+
+pub trait Widget {
+    fn enter(&mut self);
+    fn leave(&mut self);
+    fn size(&self) -> (u32, u32);
+    fn draw(
+        &mut self,
+        ctx: &mut DrawContext,
+        pos: (u32, u32),
+    ) -> Result<DrawReport, ::std::io::Error>;
+
+    fn keyboard_input(
+        &mut self,
+        keysym: u32,
+        modifier_state: ModifiersState,
+        key_state: KeyState,
+        interpreted: Option<String>,
+    );
+    fn mouse_click(&mut self, button: u32, pos: (u32, u32));
+    fn mouse_scroll(&mut self, scroll: (f64, f64), pos: (u32, u32));
+}
+
+pub struct VerticalLayout {
+    pub children: Vec<Box<dyn Widget + Send>>,
+}
+
+#[allow(dead_code)]
+impl VerticalLayout {
+    pub fn new(children: Vec<Box<dyn Widget + Send>>) -> Box<VerticalLayout> {
+        Box::new(VerticalLayout { children: children })
+    }
+}
+
+impl Widget for VerticalLayout {
+    fn enter(&mut self) {
+        for child in &mut self.children {
+            child.enter();
+        }
+    }
+    fn leave(&mut self) {
+        for child in &mut self.children {
+            child.leave();
+        }
+    }
+    fn size(&self) -> (u32, u32) {
+        let mut width = 0;
+        let mut height = 0;
+
+        for child in &self.children {
+            let size = child.size();
+            if size.0 > width {
+                width = size.0;
+            }
+            height += size.1;
+        }
+
+        (width, height)
+    }
+
+    fn draw(
+        &mut self,
+        ctx: &mut DrawContext,
+        pos: (u32, u32),
+    ) -> Result<DrawReport, ::std::io::Error> {
+        let mut offset = pos.1;
+        let mut width = 0;
+        let mut damage = Vec::new();
+        let mut full_damage = false;
+
+        for child in &mut self.children {
+            let mut report = child.draw(ctx, (pos.0, offset))?;
+            if report.width > width {
+                width = report.width;
+            }
+            offset += report.height;
+            full_damage |= report.full_damage;
+            damage.append(&mut report.damage);
+        }
+
+        Ok(DrawReport {
+            width,
+            height: offset - pos.1,
+            damage,
+            full_damage,
+        })
+    }
+
+    fn keyboard_input(
+        &mut self,
+        keysym: u32,
+        modifier_state: ModifiersState,
+        key_state: KeyState,
+        interpreted: Option<String>,
+    ) {
+        for child in &mut self.children {
+            child.keyboard_input(keysym, modifier_state, key_state, interpreted.clone());
+        }
+    }
+
+    fn mouse_click(&mut self, button: u32, pos: (u32, u32)) {
+        let mut height = 0;
+
+        for child in &mut self.children {
+            let size = child.size();
+            if pos.1 >= height && pos.1 < height + size.1 {
+                let pos = (pos.0, pos.1 - height);
+                child.mouse_click(button, pos);
+                return;
+            }
+            height += size.1;
+        }
+    }
+
+    fn mouse_scroll(&mut self, scroll: (f64, f64), pos: (u32, u32)) {
+        let mut height = 0;
+
+        for child in &mut self.children {
+            let size = child.size();
+            if pos.1 >= height && pos.1 < height + size.1 {
+                let pos = (pos.0, pos.1 - height);
+                child.mouse_scroll(scroll, pos);
+                return;
+            }
+            height += size.1;
+        }
+    }
+}
+
+pub struct HorizontalLayout {
+    pub children: Vec<Box<dyn Widget + Send>>,
+}
+
+#[allow(dead_code)]
+impl HorizontalLayout {
+    pub fn new(children: Vec<Box<dyn Widget + Send>>) -> Box<HorizontalLayout> {
+        Box::new(HorizontalLayout { children: children })
+    }
+}
+
+impl Widget for HorizontalLayout {
+    fn enter(&mut self) {
+        for child in &mut self.children {
+            child.enter();
+        }
+    }
+    fn leave(&mut self) {
+        for child in &mut self.children {
+            child.leave();
+        }
+    }
+    fn size(&self) -> (u32, u32) {
+        let mut width = 0;
+        let mut height = 0;
+
+        for child in &self.children {
+            let size = child.size();
+            if size.1 > height {
+                height = size.1;
+            }
+            width += size.0;
+        }
+
+        (width, height)
+    }
+
+    fn draw(
+        &mut self,
+        ctx: &mut DrawContext,
+        pos: (u32, u32),
+    ) -> Result<DrawReport, ::std::io::Error> {
+        let mut offset = pos.0;
+        let mut height = 0;
+        let mut damage = Vec::new();
+        let mut full_damage = false;
+
+        for child in &mut self.children {
+            let mut report = child.draw(ctx, (offset, pos.1))?;
+            if report.height > height {
+                height = report.height;
+            }
+            offset += report.width;
+            full_damage |= report.full_damage;
+            damage.append(&mut report.damage);
+        }
+
+        Ok(DrawReport {
+            width: offset - pos.0,
+            height,
+            damage,
+            full_damage,
+        })
+    }
+
+    fn keyboard_input(
+        &mut self,
+        keysym: u32,
+        modifier_state: ModifiersState,
+        key_state: KeyState,
+        interpreted: Option<String>,
+    ) {
+        for child in &mut self.children {
+            child.keyboard_input(keysym, modifier_state, key_state, interpreted.clone());
+        }
+    }
+
+    fn mouse_click(&mut self, button: u32, pos: (u32, u32)) {
+        let mut width = 0;
+
+        for child in &mut self.children {
+            let size = child.size();
+            if pos.0 >= width && pos.0 < width + size.0 {
+                let pos = (pos.0 - width, pos.1);
+                child.mouse_click(button, pos);
+                return;
+            }
+
+            width += size.0;
+        }
+    }
+
+    fn mouse_scroll(&mut self, scroll: (f64, f64), pos: (u32, u32)) {
+        let mut width = 0;
+
+        for child in &mut self.children {
+            let size = child.size();
+            if pos.0 >= width && pos.0 < width + size.0 {
+                let pos = (pos.0 - width, pos.1);
+                child.mouse_scroll(scroll, pos);
+                return;
+            }
+
+            width += size.0;
+        }
+    }
+}
+
+pub struct Margin {
+    pub child: Box<dyn Widget + Send>,
+    pub margins: (u32, u32, u32, u32), // left, right, top, bottom
+}
+
+#[allow(dead_code)]
+impl Margin {
+    pub fn new(margins: (u32, u32, u32, u32), child: Box<dyn Widget + Send>) -> Box<Margin> {
+        Box::new(Margin {
+            child: child,
+            margins: margins,
+        })
+    }
+}
+
+impl Widget for Margin {
+    fn enter(&mut self) {
+        self.child.enter()
+    }
+    fn leave(&mut self) {
+        self.child.leave()
+    }
+    fn size(&self) -> (u32, u32) {
+        let size = self.child.size();
+        (
+            size.0 + self.margins.0 + self.margins.1,
+            size.1 + self.margins.2 + self.margins.3,
+        )
+    }
+
+    fn draw(
+        &mut self,
+        ctx: &mut DrawContext,
+        pos: (u32, u32),
+    ) -> Result<DrawReport, ::std::io::Error> {
+        let report = self
+            .child
+            .draw(ctx, (pos.0 + self.margins.0, pos.1 + self.margins.2))?;
+        Ok(DrawReport {
+            width: report.width + self.margins.0 + self.margins.1,
+            height: report.height + self.margins.2 + self.margins.3,
+            damage: report.damage,
+            full_damage: report.full_damage,
+        })
+    }
+
+    fn keyboard_input(
+        &mut self,
+        keysym: u32,
+        modifier_state: ModifiersState,
+        key_state: KeyState,
+        interpreted: Option<String>,
+    ) {
+        self.child
+            .keyboard_input(keysym, modifier_state, key_state, interpreted);
+    }
+
+    fn mouse_click(&mut self, button: u32, pos: (u32, u32)) {
+        let pos = (
+            pos.0.saturating_sub(self.margins.0),
+            pos.1.saturating_sub(self.margins.2),
+        );
+        self.child.mouse_click(button, pos);
+    }
+
+    fn mouse_scroll(&mut self, scroll: (f64, f64), pos: (u32, u32)) {
+        let pos = (
+            pos.0.saturating_sub(self.margins.0),
+            pos.1.saturating_sub(self.margins.2),
+        );
+        self.child.mouse_scroll(scroll, pos);
+    }
+}
+
+pub struct Fixed {
+    pub child: Box<dyn Widget + Send>,
+    pub size: (u32, u32),
+}
+
+#[allow(dead_code)]
+impl Fixed {
+    pub fn new(size: (u32, u32), child: Box<dyn Widget + Send>) -> Box<Fixed> {
+        Box::new(Fixed {
+            child: child,
+            size: size,
+        })
+    }
+}
+
+impl Widget for Fixed {
+    fn enter(&mut self) {
+        self.child.enter()
+    }
+    fn leave(&mut self) {
+        self.child.leave()
+    }
+    fn size(&self) -> (u32, u32) {
+        self.size
+    }
+
+    fn draw(
+        &mut self,
+        ctx: &mut DrawContext,
+        pos: (u32, u32),
+    ) -> Result<DrawReport, ::std::io::Error> {
+        let report = self.child.draw(ctx, pos)?;
+        Ok(DrawReport {
+            width: self.size.0,
+            height: self.size.1,
+            damage: report.damage,
+            full_damage: report.full_damage,
+        })
+    }
+
+    fn keyboard_input(
+        &mut self,
+        keysym: u32,
+        modifier_state: ModifiersState,
+        key_state: KeyState,
+        interpreted: Option<String>,
+    ) {
+        self.child
+            .keyboard_input(keysym, modifier_state, key_state, interpreted);
+    }
+
+    fn mouse_click(&mut self, button: u32, pos: (u32, u32)) {
+        self.child.mouse_click(button, pos);
+    }
+
+    fn mouse_scroll(&mut self, scroll: (f64, f64), pos: (u32, u32)) {
+        self.child.mouse_scroll(scroll, pos);
+    }
+}

src/widgets/audio/alsa_sound.rs

@@ -0,0 +1,109 @@
+use crate::color::Color;
+use crate::widgets::bar_widget::{BarWidget, BarWidgetImpl};
+
+use alsa::mixer::{Mixer, Selem, SelemChannelId, SelemId};
+
+const CARD_NAME: &'static str = "default";
+const SELEM_NAME: &'static str = "Master";
+const SELEM_ID: u32 = 0u32;
+
+#[inline]
+fn alsa_error_to_io_error(fail: &'static str, err: &alsa::Error) -> ::std::io::Error {
+    let kind = ::std::io::ErrorKind::Other;
+    let func = err.func();
+    let errno = err
+        .errno()
+        .map(|errno| format!("; errno = {}", errno))
+        .unwrap_or(String::new());
+    return ::std::io::Error::new(kind, format!("{}: {}{}", fail, func, errno));
+}
+
+#[inline]
+fn alsa_volume_to_f32(volume: i64, min: i64, max: i64) -> f32 {
+    (volume - min) as f32 / (max - min) as f32
+}
+
+#[inline]
+fn f32_to_alsa_volume(volume: f32, min: i64, max: i64) -> i64 {
+    min + ((max - min) as f32 * volume) as i64
+}
+
+pub struct Alsa {
+    pub mixer: Mixer,
+}
+
+impl Alsa {
+    pub fn new(font_size: f32, length: u32) -> ::std::io::Result<Box<BarWidget>> {
+        let mixer = Mixer::new(CARD_NAME, true)
+            .map_err(|err| alsa_error_to_io_error("Failed to create ALSA mixer", &err))?;
+        let mixer = Self { mixer };
+        mixer.get_master_volume()?; // probing
+        Ok(BarWidget::new_simple(font_size, length, Box::new(mixer)))
+    }
+    #[inline]
+    pub fn get_master<'a>(&'a self) -> ::std::io::Result<Selem<'a>> {
+        let master_id = SelemId::new(SELEM_NAME, SELEM_ID);
+        match self.mixer.find_selem(&master_id) {
+            Some(master) => Ok(master),
+            None => {
+                let kind = ::std::io::ErrorKind::NotFound;
+                let desc = "`Master` not found";
+                Err(::std::io::Error::new(kind, desc))
+            }
+        }
+    }
+    pub fn get_master_volume(&self) -> ::std::io::Result<f32> {
+        let master = self.get_master()?;
+        let (min, max) = master.get_playback_volume_range();
+        master
+            .get_playback_volume(SelemChannelId::mono())
+            .map(|volume| alsa_volume_to_f32(volume, min, max))
+            .map_err(|e| alsa_error_to_io_error("Failed to get `Master` volume", &e))
+    }
+    pub fn set_master_volume(&self, volume: f32) -> ::std::io::Result<()> {
+        let master = self.get_master()?;
+        let (min, max) = master.get_playback_volume_range();
+        let volume = f32_to_alsa_volume(volume, min, max);
+        master
+            .set_playback_volume_all(volume)
+            .map_err(|e| alsa_error_to_io_error("Failed to set `Master` volume", &e))
+    }
+    pub fn inc_master_volume(&self, diff: f32) -> ::std::io::Result<()> {
+        let master = self.get_master()?;
+        let (min, max) = master.get_playback_volume_range();
+        master
+            .get_playback_volume(SelemChannelId::mono())
+            .and_then(|volume| {
+                let volume = alsa_volume_to_f32(volume, min, max);
+                let volume = f32_to_alsa_volume(volume + diff, min, max);
+                master.set_playback_volume_all(volume)
+            })
+            .map_err(|e| alsa_error_to_io_error("Failed to inc/dec `Master` volume", &e))
+    }
+}
+
+impl BarWidgetImpl for Alsa {
+    fn name(&self) -> &str {
+        "volume"
+    }
+    fn value(&self) -> f32 {
+        match self.get_master_volume() {
+            Ok(v) => v,
+            Err(e) => panic!(e),
+        }
+    }
+    fn color(&self) -> Color {
+        Color::new(1.0, 1.0, 1.0, 1.0)
+    }
+    fn inc(&mut self, diff: f32) {
+        if let Err(e) = self.inc_master_volume(diff) {
+            panic!(e)
+        }
+    }
+    fn set(&mut self, abs: f32) {
+        if let Err(e) = self.set_master_volume(abs) {
+            panic!(e)
+        }
+    }
+    fn toggle(&mut self) {}
+}

src/widgets/audio/mod.rs

@@ -0,0 +1,9 @@
+#[cfg(feature = "alsa-widget")]
+mod alsa_sound;
+#[cfg(feature = "alsa-widget")]
+pub use alsa_sound::Alsa;
+
+#[cfg(feature = "pulseaudio-widget")]
+mod pulse_sound;
+#[cfg(feature = "pulseaudio-widget")]
+pub use pulse_sound::PulseAudio;

src/widgets/audio/pulse_sound.rs

@@ -0,0 +1,528 @@
+use crate::cmd::Cmd;
+use crate::color::Color;
+use crate::widgets::bar_widget::{BarWidget, BarWidgetImpl};
+
+use std::cell::RefCell;
+use std::collections::HashMap;
+use std::ops::Deref;
+use std::rc::Rc;
+use std::sync::mpsc::{channel, Sender};
+use std::sync::{Arc, Mutex};
+use std::thread;
+
+use libpulse_binding::callbacks::ListResult;
+use libpulse_binding::context::{
+    flags, introspect::ServerInfo, introspect::SinkInfo, subscribe::subscription_masks,
+    subscribe::Facility, subscribe::Operation as SubscribeOperation, Context, State as PulseState,
+};
+use libpulse_binding::mainloop::standard::IterateResult;
+use libpulse_binding::mainloop::standard::Mainloop;
+use libpulse_binding::proplist::{properties, Proplist};
+use libpulse_binding::volume::{ChannelVolumes, Volume, VOLUME_MAX, VOLUME_NORM};
+
+struct PulseAudioConnection {
+    mainloop: Rc<RefCell<Mainloop>>,
+    context: Rc<RefCell<Context>>,
+}
+
+#[derive(Clone)]
+struct PulseAudioSinkInfo {
+    volume: ChannelVolumes,
+    mute: bool,
+}
+
+struct PulseAudioClient {
+    sender: Sender<PulseAudioClientRequest>,
+    default_sink: String,
+    sinks: HashMap<String, PulseAudioSinkInfo>,
+}
+
+enum PulseAudioClientRequest {
+    GetDefaultDevice(Option<Sender<bool>>),
+    GetSinkInfoByIndex(Option<Sender<bool>>, u32),
+    GetSinkInfoByName(Option<Sender<bool>>, String),
+    SetSinkVolumeByName(Option<Sender<bool>>, String, ChannelVolumes),
+    SetSinkMuteByName(Option<Sender<bool>>, String, bool),
+}
+
+#[derive(Debug)]
+struct PulseAudioSoundDeviceInner {
+    name: Option<String>,
+    volume: Option<ChannelVolumes>,
+    volume_avg: f32,
+    muted: bool,
+    default_sink: String,
+}
+
+struct PulseAudioSoundDevice {
+    client: Arc<Mutex<PulseAudioClient>>,
+    inner: Arc<Mutex<PulseAudioSoundDeviceInner>>,
+}
+
+impl PulseAudioConnection {
+    fn new() -> Result<Self, ::std::io::Error> {
+        let mut proplist = Proplist::new().unwrap();
+        proplist
+            .set_str(properties::APPLICATION_NAME, "wldash")
+            .unwrap();
+
+        let mainloop = Rc::new(RefCell::new(Mainloop::new().unwrap()));
+
+        let context = Rc::new(RefCell::new(
+            Context::new_with_proplist(mainloop.borrow().deref(), "wldash_context", &proplist)
+                .unwrap(),
+        ));
+
+        context
+            .borrow_mut()
+            .connect(None, flags::NOFLAGS, None)
+            .map_err(|_e| {
+                ::std::io::Error::new(
+                    ::std::io::ErrorKind::Other,
+                    "unable to connect to pulseaudio context",
+                )
+            })?;
+
+        let mut connection = PulseAudioConnection { mainloop, context };
+
+        // Wait for context to be ready
+        loop {
+            connection.iterate(false)?;
+            match connection.context.borrow().get_state() {
+                PulseState::Ready => {
+                    break;
+                }
+                PulseState::Failed | PulseState::Terminated => {}
+                _ => {}
+            }
+        }
+
+        Ok(connection)
+    }
+
+    fn iterate(&mut self, blocking: bool) -> Result<(), ::std::io::Error> {
+        match self.mainloop.borrow_mut().iterate(blocking) {
+            IterateResult::Quit(_) | IterateResult::Err(_) => Err(::std::io::Error::new(
+                ::std::io::ErrorKind::Other,
+                "unable to iterate pulseaudio state",
+            )),
+            IterateResult::Success(_) => Ok(()),
+        }
+    }
+}
+
+impl PulseAudioClient {
+    fn new<F>(listener: F) -> Result<Arc<Mutex<Self>>, ::std::io::Error>
+    where
+        F: Fn(Arc<Mutex<Self>>) -> (),
+        F: Send + 'static + Clone,
+    {
+        let (tx, rx) = channel();
+
+        let client = Arc::new(Mutex::new(PulseAudioClient {
+            sender: tx,
+            default_sink: "@DEFAULT_SINK@".to_string(),
+            sinks: HashMap::new(),
+        }));
+
+        let loop_client = client.clone();
+        let (tx1, rx1) = channel();
+        let _ = thread::Builder::new()
+            .name("pa_writer".to_string())
+            .spawn(move || {
+                let mut conn = match PulseAudioConnection::new() {
+                    Ok(v) => {
+                        tx1.send(true).unwrap();
+                        v
+                    }
+                    Err(_) => {
+                        tx1.send(false).unwrap();
+                        return;
+                    }
+                };
+
+                // make sure mainloop dispatched everything
+                for _ in 0..10 {
+                    conn.iterate(false).unwrap();
+                }
+
+                loop {
+                    let cl = loop_client.clone();
+                    let l = listener.clone();
+                    match rx.recv() {
+                        Err(_) => return,
+                        Ok(req) => {
+                            let mut introspector = conn.context.borrow_mut().introspect();
+
+                            match req {
+                                PulseAudioClientRequest::GetDefaultDevice(s) => {
+                                    introspector.get_server_info(move |info| {
+                                        let _res = PulseAudioClient::server_info_callback(
+                                            cl.clone(),
+                                            l.clone(),
+                                            info,
+                                        );
+                                        if let Some(s) = &s {
+                                            let _ = s.send(true);
+                                        }
+                                    });
+                                }
+                                PulseAudioClientRequest::GetSinkInfoByIndex(s, index) => {
+                                    introspector.get_sink_info_by_index(index, move |res| {
+                                        PulseAudioClient::sink_info_callback(
+                                            cl.clone(),
+                                            l.clone(),
+                                            res,
+                                        );
+                                        if let Some(s) = &s {
+                                            let _ = s.send(true);
+                                        }
+                                    });
+                                }
+                                PulseAudioClientRequest::GetSinkInfoByName(s, name) => {
+                                    introspector.get_sink_info_by_name(&name, move |res| {
+                                        PulseAudioClient::sink_info_callback(
+                                            cl.clone(),
+                                            l.clone(),
+                                            res,
+                                        );
+                                        if let Some(s) = &s {
+                                            let _ = s.send(true);
+                                        }
+                                    });
+                                }
+                                PulseAudioClientRequest::SetSinkVolumeByName(s, name, volumes) => {
+                                    introspector.set_sink_volume_by_name(&name, &volumes, None);
+                                    if let Some(s) = &s {
+                                        let _ = s.send(true);
+                                    }
+                                }
+                                PulseAudioClientRequest::SetSinkMuteByName(s, name, mute) => {
+                                    introspector.set_sink_mute_by_name(&name, mute, None);
+                                    if let Some(s) = &s {
+                                        let _ = s.send(true);
+                                    }
+                                }
+                            };
+
+                            // send request and receive response
+                            conn.iterate(true).unwrap();
+                            conn.iterate(true).unwrap();
+                        }
+                    }
+                }
+            });
+
+        // subscribe
+        let cl2 = client.clone();
+        let (tx2, rx2) = channel();
+        let _ = thread::Builder::new()
+            .name("pa_reader".to_string())
+            .spawn(move || {
+                let conn = match PulseAudioConnection::new() {
+                    Ok(v) => {
+                        tx2.send(true).unwrap();
+                        v
+                    }
+                    Err(_) => {
+                        tx2.send(false).unwrap();
+                        return;
+                    }
+                };
+                // subcribe for events
+                conn.context
+                    .borrow_mut()
+                    .set_subscribe_callback(Some(Box::new(move |facility, operation, index| {
+                        cl2.lock()
+                            .unwrap()
+                            .subscribe_callback(facility, operation, index)
+                    })));
+                conn.context.borrow_mut().subscribe(
+                    subscription_masks::SERVER | subscription_masks::SINK,
+                    |_| {},
+                );
+
+                conn.mainloop.borrow_mut().run().unwrap();
+            });
+
+        let pa_writer_res = rx1.recv().unwrap();
+        let pa_reader_res = rx2.recv().unwrap();
+
+        if !pa_writer_res || !pa_reader_res {
+            return Err(::std::io::Error::new(
+                ::std::io::ErrorKind::Other,
+                "unable to start pulseaudio thread",
+            ));
+        }
+
+        Ok(client)
+    }
+
+    fn send(&self, request: PulseAudioClientRequest) -> Result<(), ::std::io::Error> {
+        let res = self.sender.send(request).map_err(|_e| {
+            ::std::io::Error::new(
+                ::std::io::ErrorKind::Other,
+                "unable to send pulseaudio request",
+            )
+        });
+        res
+    }
+
+    fn server_info_callback<F>(s: Arc<Mutex<Self>>, listener: F, server_info: &ServerInfo)
+    where
+        F: Fn(Arc<Mutex<Self>>) -> (),
+        F: Send + 'static,
+    {
+        match server_info.default_sink_name.clone() {
+            None => {}
+            Some(default_sink) => {
+                (*s.lock().unwrap()).default_sink = default_sink.into();
+                listener(s);
+            }
+        }
+    }
+
+    fn sink_info_callback<F>(s: Arc<Mutex<Self>>, listener: F, result: ListResult<&SinkInfo>)
+    where
+        F: Fn(Arc<Mutex<Self>>) -> (),
+        F: Send + 'static,
+    {
+        match result {
+            ListResult::End | ListResult::Error => {}
+            ListResult::Item(sink_info) => match sink_info.name.clone() {
+                None => {}
+                Some(name) => {
+                    let info = PulseAudioSinkInfo {
+                        volume: sink_info.volume,
+                        mute: sink_info.mute,
+                    };
+                    s.lock().unwrap().sinks.insert(name.into(), info);
+                    listener(s);
+                }
+            },
+        }
+    }
+
+    fn subscribe_callback(
+        &self,
+        facility: Option<Facility>,
+        _operation: Option<SubscribeOperation>,
+        index: u32,
+    ) {
+        match facility {
+            None => {}
+            Some(facility) => match facility {
+                Facility::Server => {
+                    let _ = self.send(PulseAudioClientRequest::GetDefaultDevice(None));
+                }
+                Facility::Sink => {
+                    let _ = self.send(PulseAudioClientRequest::GetSinkInfoByIndex(None, index));
+                }
+                _ => {}
+            },
+        }
+    }
+}
+
+impl PulseAudioSoundDevice {
+    fn new<F>(listener: F) -> Result<Self, ::std::io::Error>
+    where
+        F: Fn() -> (),
+        F: Send + 'static + Clone,
+    {
+        let inner = Arc::new(Mutex::new(PulseAudioSoundDeviceInner {
+            name: None,
+            volume: None,
+            volume_avg: 0.0,
+            muted: false,
+            default_sink: "@DEFAULT_SINK@".to_string(),
+        }));
+
+        let cb_inner = inner.clone();
+        let client = PulseAudioClient::new(move |client| {
+            let mut inner = cb_inner.lock().unwrap();
+            inner.default_sink = client.lock().unwrap().default_sink.clone();
+            let name = inner
+                .name
+                .clone()
+                .unwrap_or_else(|| inner.default_sink.clone());
+            let sink_info = match client.lock().unwrap().sinks.get(&name) {
+                None => return,
+                Some(sink_info) => (*sink_info).clone(),
+            };
+
+            inner.volume = Some(sink_info.volume);
+            inner.volume_avg = sink_info.volume.avg().0 as f32 / VOLUME_NORM.0 as f32;
+            inner.muted = sink_info.mute;
+
+            listener();
+        })?;
+
+        let cl = client.clone();
+        let (tx, rx) = channel();
+        {
+            let cl = client.lock().unwrap();
+            cl.send(PulseAudioClientRequest::GetDefaultDevice(Some(tx)))?;
+        }
+        rx.recv().unwrap();
+        let name = {
+            let cl = client.lock().unwrap();
+            cl.default_sink.to_string()
+        };
+        (*inner.lock().unwrap()).name = Some(name.clone());
+        let device = PulseAudioSoundDevice {
+            client: cl,
+            inner: inner,
+        };
+        let (tx, rx) = channel();
+        {
+            let cl = client.lock().unwrap();
+            cl.send(PulseAudioClientRequest::GetSinkInfoByName(Some(tx), name))?;
+        }
+        rx.recv().unwrap();
+
+        Ok(device)
+    }
+
+    fn muted(&self) -> bool {
+        let inner = self.inner.lock().unwrap();
+        inner.muted
+    }
+
+    fn volume(&self) -> f32 {
+        let inner = self.inner.lock().unwrap();
+        inner.volume_avg
+    }
+
+    fn inc_volume(&mut self, step: f32) -> Result<(), ::std::io::Error> {
+        let mut inner = self.inner.lock().unwrap();
+        let mut volume = match inner.volume {
+            Some(volume) => volume,
+            None => {
+                return Err(::std::io::Error::new(
+                    ::std::io::ErrorKind::Other,
+                    "unable to set volume",
+                ))
+            }
+        };
+
+        // apply step to volumes
+        let step = (step * VOLUME_NORM.0 as f32).round() as i32;
+        if step > 0 {
+            volume.inc_clamp(Volume(step as u32), VOLUME_MAX);
+        } else {
+            volume.decrease(Volume(-step as u32));
+        }
+
+        let name = inner
+            .name
+            .clone()
+            .unwrap_or_else(|| inner.default_sink.clone());
+
+        // update volumes
+        inner.volume = Some(volume);
+        inner.volume_avg = volume.avg().0 as f32 / VOLUME_NORM.0 as f32;
+        self.client
+            .lock()
+            .unwrap()
+            .send(PulseAudioClientRequest::SetSinkVolumeByName(
+                None, name, volume,
+            ))?;
+        Ok(())
+    }
+
+    fn set_volume(&mut self, val: f32) -> Result<(), ::std::io::Error> {
+        let mut inner = self.inner.lock().unwrap();
+        let mut volume = match inner.volume {
+            Some(volume) => volume,
+            None => {
+                return Err(::std::io::Error::new(
+                    ::std::io::ErrorKind::Other,
+                    "unable to set volume",
+                ))
+            }
+        };
+
+        // apply step to volumes
+        volume.scale(Volume((val * VOLUME_NORM.0 as f32).round() as u32));
+
+        let name = inner
+            .name
+            .clone()
+            .unwrap_or_else(|| inner.default_sink.clone());
+
+        // update volumes
+        inner.volume = Some(volume);
+        inner.volume_avg = volume.avg().0 as f32 / VOLUME_NORM.0 as f32;
+        self.client
+            .lock()
+            .unwrap()
+            .send(PulseAudioClientRequest::SetSinkVolumeByName(
+                None, name, volume,
+            ))?;
+        Ok(())
+    }
+
+    fn toggle(&mut self) -> Result<(), ::std::io::Error> {
+        let mut inner = self.inner.lock().unwrap();
+        inner.muted = !inner.muted;
+        self.client
+            .lock()
+            .unwrap()
+            .send(PulseAudioClientRequest::SetSinkMuteByName(
+                None,
+                inner
+                    .name
+                    .clone()
+                    .unwrap_or_else(|| inner.default_sink.clone()),
+                inner.muted,
+            ))?;
+        Ok(())
+    }
+}
+
+pub struct PulseAudio {
+    device: PulseAudioSoundDevice,
+}
+
+impl PulseAudio {
+    pub fn new(
+        font_size: f32,
+        length: u32,
+        sender: Sender<Cmd>,
+    ) -> Result<Box<BarWidget>, ::std::io::Error> {
+        BarWidget::new(font_size, length, move |dirty| {
+            let device = PulseAudioSoundDevice::new(move || {
+                *dirty.lock().unwrap() = true;
+                sender.send(Cmd::Draw).unwrap();
+            })?;
+            Ok(Box::new(PulseAudio { device: device }))
+        })
+    }
+}
+
+impl BarWidgetImpl for PulseAudio {
+    fn name(&self) -> &str {
+        "volume"
+    }
+    fn value(&self) -> f32 {
+        self.device.volume()
+    }
+    fn color(&self) -> Color {
+        let muted = self.device.muted();
+        if muted {
+            Color::new(1.0, 1.0, 0.0, 1.0)
+        } else {
+            Color::new(1.0, 1.0, 1.0, 1.0)
+        }
+    }
+    fn inc(&mut self, inc: f32) {
+        self.device.inc_volume(inc).unwrap();
+    }
+    fn set(&mut self, val: f32) {
+        self.device.set_volume(val).unwrap();
+    }
+    fn toggle(&mut self) {
+        self.device.toggle().unwrap();
+    }
+}

src/widgets/backlight.rs

@@ -0,0 +1,139 @@
+use crate::color::Color;
+use crate::widgets::bar_widget::{BarWidget, BarWidgetImpl};
+
+use std::fs::OpenOptions;
+use std::io::{Error, ErrorKind};
+use std::io::{Read, Write};
+use std::path::{Path, PathBuf};
+
+pub struct Backlight {
+    device_path: PathBuf,
+    cur_brightness: u64,
+    max_brightness: u64,
+}
+
+fn read_file_as_u64(path: &Path) -> Result<u64, Error> {
+    let mut file = OpenOptions::new().read(true).open(path)?;
+    let mut str = String::new();
+    file.read_to_string(&mut str)?;
+    str.pop();
+    str.parse::<u64>()
+        .map_err(|_e| Error::new(ErrorKind::Other, "unable to parse value"))
+}
+
+fn write_file_as_u64(path: &Path, value: u64) -> Result<(), Error> {
+    let mut file = OpenOptions::new().write(true).open(path)?;
+    file.write_fmt(format_args!("{}", value))
+}
+
+impl Backlight {
+    pub fn update(&mut self) -> Result<(), Error> {
+        self.cur_brightness = read_file_as_u64(self.device_path.join("brightness").as_path())?;
+        self.max_brightness = read_file_as_u64(self.device_path.join("max_brightness").as_path())?;
+        Ok(())
+    }
+
+    pub fn sync(&mut self) -> Result<(), Error> {
+        write_file_as_u64(
+            self.device_path.join("brightness").as_path(),
+            self.cur_brightness,
+        )?;
+        self.update()?;
+        Ok(())
+    }
+
+    pub fn brightness(&self) -> f32 {
+        if self.cur_brightness > self.max_brightness {
+            // what.
+            return 1.0;
+        }
+
+        (self.cur_brightness as f32 / self.max_brightness as f32)
+    }
+
+    pub fn set(&mut self, val: f32) -> Result<(), Error> {
+        self.cur_brightness = (self.max_brightness as f32 * val) as u64;
+        Ok(())
+    }
+
+    pub fn add(&mut self, diff: f32) -> Result<(), Error> {
+        let inc = (self.max_brightness as f32 * diff) as i64;
+
+        self.cur_brightness = if self.cur_brightness as i64 + inc < 1 {
+            1
+        } else if self.cur_brightness as i64 + inc > self.max_brightness as i64 {
+            self.max_brightness
+        } else {
+            (self.cur_brightness as i64 + inc) as u64
+        };
+
+        Ok(())
+    }
+
+    pub fn new(font_size: f32, length: u32) -> Result<Box<BarWidget>, Error> {
+        let devices = Path::new("/sys/class/backlight").read_dir()?;
+
+        let first_device = match devices.take(1).next() {
+            Some(v) => match v {
+                Ok(v) => v,
+                Err(_) => return Err(Error::new(ErrorKind::Other, "no backlight device")),
+            },
+            None => return Err(Error::new(ErrorKind::Other, "no backlight device")),
+        };
+        let mut dev = Backlight {
+            device_path: first_device.path(),
+            cur_brightness: 0,
+            max_brightness: 0,
+        };
+
+        dev.update()?;
+
+        Ok(BarWidget::new_simple(font_size, length, Box::new(dev)))
+    }
+}
+
+impl BarWidgetImpl for Backlight {
+    fn name(&self) -> &str {
+        "backlight"
+    }
+    fn value(&self) -> f32 {
+        self.brightness()
+    }
+    fn color(&self) -> Color {
+        Color::new(1.0, 1.0, 1.0, 1.0)
+    }
+    fn inc(&mut self, inc: f32) {
+        self.add(inc).unwrap();
+        match self.sync() {
+            Ok(val) => val,
+            Err(err) => {
+                eprintln!("Error while trying to change brightness: {}", err);
+                ()
+            }
+        }
+    }
+    fn set(&mut self, val: f32) {
+        self.set(val).unwrap();
+        match self.sync() {
+            Ok(val) => val,
+            Err(err) => {
+                eprintln!("Error while trying to change brightness: {}", err);
+                ()
+            }
+        }
+    }
+    fn toggle(&mut self) {
+        self.cur_brightness = if self.cur_brightness == 1 {
+            self.max_brightness
+        } else {
+            1
+        };
+        match self.sync() {
+            Ok(val) => val,
+            Err(err) => {
+                eprintln!("Error while trying to change brightness: {}", err);
+                ()
+            }
+        }
+    }
+}

src/widgets/bar_widget.rs

@@ -0,0 +1,147 @@
+use crate::color::Color;
+use crate::draw::{draw_bar, draw_box, Font, ROBOTO_REGULAR};
+use crate::widget::{DrawContext, DrawReport, KeyState, ModifiersState, Widget};
+
+use std::sync::{Arc, Mutex};
+
+pub trait BarWidgetImpl {
+    fn name(&self) -> &str;
+    fn value(&self) -> f32;
+    fn color(&self) -> Color;
+    fn inc(&mut self, inc: f32);
+    fn set(&mut self, val: f32);
+    fn toggle(&mut self);
+}
+
+pub struct BarWidget {
+    bar_impl: Box<dyn BarWidgetImpl + Send>,
+    font: Font,
+    font_size: u32,
+    length: u32,
+    dirty: Arc<Mutex<bool>>,
+}
+
+impl BarWidget {
+    pub fn new_simple(
+        font_size: f32,
+        length: u32,
+        w: Box<dyn BarWidgetImpl + Send>,
+    ) -> Box<BarWidget> {
+        let mut font = Font::new(&ROBOTO_REGULAR, font_size);
+        font.add_str_to_cache(w.name());
+
+        Box::new(BarWidget {
+            bar_impl: w,
+            dirty: Arc::new(Mutex::new(true)),
+            font: font,
+            font_size: font_size as u32,
+            length: length,
+        })
+    }
+
+    pub fn new<F>(font_size: f32, length: u32, f: F) -> Result<Box<BarWidget>, ::std::io::Error>
+    where
+        F: FnOnce(Arc<Mutex<bool>>) -> Result<Box<dyn BarWidgetImpl + Send>, ::std::io::Error>,
+        F: Send + 'static + Clone,
+    {
+        let dirty = Arc::new(Mutex::new(true));
+        let im = f(dirty.clone())?;
+
+        let mut font = Font::new(&ROBOTO_REGULAR, font_size);
+        font.add_str_to_cache(im.name());
+
+        Ok(Box::new(BarWidget {
+            bar_impl: im,
+            dirty: dirty,
+            font: font,
+            font_size: font_size as u32,
+            length: length,
+        }))
+    }
+}
+
+impl Widget for BarWidget {
+    fn enter(&mut self) {}
+    fn leave(&mut self) {}
+    fn size(&self) -> (u32, u32) {
+        (self.length, self.font_size)
+    }
+
+    fn draw(
+        &mut self,
+        ctx: &mut DrawContext,
+        pos: (u32, u32),
+    ) -> Result<DrawReport, ::std::io::Error> {
+        let (width, height) = self.size();
+        {
+            let mut d = self.dirty.lock().unwrap();
+            if !*d && !ctx.force {
+                return Ok(DrawReport::empty(width, height));
+            }
+            *d = false;
+        }
+
+        let buf = &mut ctx.buf.subdimensions((pos.0, pos.1, width, height))?;
+        buf.memset(ctx.bg);
+
+        let c = Color::new(1.0, 1.0, 1.0, 1.0);
+        self.font.draw_text(buf, ctx.bg, &c, self.bar_impl.name())?;
+
+        let c = self.bar_impl.color();
+        let bar_off = 5 * self.font_size;
+        let mut val = self.bar_impl.value();
+        draw_bar(
+            &mut buf.offset((bar_off, 0))?,
+            &c,
+            self.length - bar_off,
+            self.font_size,
+            val,
+        )?;
+        let mut iter = 1.0;
+        while val > 1.0 {
+            let c = &Color::new(0.75 / iter, 0.25 / iter, 0.25 / iter, 1.0);
+            val -= 1.0;
+            iter += 1.0;
+            draw_bar(
+                &mut buf.offset((bar_off, 0))?,
+                &c,
+                self.length - bar_off,
+                self.font_size,
+                val,
+            )?;
+        }
+        draw_box(
+            &mut buf.offset((bar_off, 0))?,
+            &c,
+            (self.length - bar_off, self.font_size),
+        )?;
+        Ok(DrawReport {
+            width: width,
+            height: height,
+            damage: vec![buf.get_signed_bounds()],
+            full_damage: false,
+        })
+    }
+
+    fn keyboard_input(&mut self, _: u32, _: ModifiersState, _: KeyState, _: Option<String>) {}
+    fn mouse_click(&mut self, button: u32, (x, _): (u32, u32)) {
+        *self.dirty.lock().unwrap() = true;
+        match button {
+            272 => {
+                let offset = 5 * self.font_size;
+                if x > offset {
+                    self.bar_impl
+                        .set(((x - offset) + 1) as f32 / (self.length - offset) as f32);
+                }
+            }
+            273 => self.bar_impl.toggle(),
+            x => {
+                dbg!(x);
+            }
+        }
+    }
+    fn mouse_scroll(&mut self, (_, y): (f64, f64), _: (u32, u32)) {
+        *self.dirty.lock().unwrap() = true;
+        self.bar_impl.inc(y as f32 / -800.0);
+    }
+}

src/widgets/battery.rs

@@ -0,0 +1,215 @@
+use crate::cmd::Cmd;
+use crate::color::Color;
+use crate::widgets::bar_widget::{BarWidget, BarWidgetImpl};
+
+use std::sync::mpsc::Sender;
+use std::sync::{Arc, Mutex};
+use std::thread;
+
+use dbus;
+
+fn get_upower_property(
+    con: &dbus::Connection,
+    device_path: &str,
+    property: &str,
+) -> Result<dbus::Message, ::std::io::Error> {
+    let msg = dbus::Message::new_method_call(
+        "org.freedesktop.UPower",
+        device_path,
+        "org.freedesktop.DBus.Properties",
+        "Get",
+    )
+    .map_err(|_| {
+        ::std::io::Error::new(
+            ::std::io::ErrorKind::Other,
+            "could not send make dbus method call",
+        )
+    })?
+    .append2(
+        dbus::MessageItem::Str("org.freedesktop.UPower.Device".to_string()),
+        dbus::MessageItem::Str(property.to_string()),
+    );;
+
+    con.send_with_reply_and_block(msg, 1000).map_err(|_| {
+        ::std::io::Error::new(::std::io::ErrorKind::Other, "could not send dbus message")
+    })
+}
+
+pub struct UpowerBattery {
+    device_path: String,
+    inner: Arc<Mutex<UpowerBatteryInner>>,
+}
+
+pub struct UpowerBatteryInner {
+    state: UpowerBatteryState,
+    capacity: f64,
+}
+
+enum UpowerBatteryState {
+    Charging,
+    Discharging,
+    Empty,
+    Full,
+    NotCharging,
+    Unknown,
+}
+
+impl UpowerBattery {
+    pub fn from_device(device: &str) -> Result<Self, ::std::io::Error> {
+        let device_path = format!("/org/freedesktop/UPower/devices/battery_{}", device);
+        let con = dbus::Connection::get_private(dbus::BusType::System).map_err(|_| {
+            ::std::io::Error::new(::std::io::ErrorKind::Other, "could not get dbus connection")
+        })?;
+
+        let upower_type: dbus::arg::Variant<u32> =
+            match get_upower_property(&con, &device_path, "Type")?.get1() {
+                Some(v) => v,
+                None => {
+                    return Err(::std::io::Error::new(
+                        ::std::io::ErrorKind::Other,
+                        "no such upower device",
+                    ));
+                }
+            };
+
+        // https://upower.freedesktop.org/docs/Device.html#Device:Type
+        if upower_type.0 != 2 {
+            return Err(::std::io::Error::new(
+                ::std::io::ErrorKind::Other,
+                "UPower device is not a battery.",
+            ));
+        }
+
+        let capacity: f64 = match get_upower_property(&con, &device_path, "Percentage")?
+            .get1::<dbus::arg::Variant<f64>>()
+        {
+            Some(v) => v.0,
+            None => {
+                return Err(::std::io::Error::new(
+                    ::std::io::ErrorKind::Other,
+                    "no such upower device",
+                ));
+            }
+        };
+        let state: UpowerBatteryState = match get_upower_property(&con, &device_path, "State")?
+            .get1::<dbus::arg::Variant<u32>>()
+        {
+            Some(v) => match v.0 {
+                1 => UpowerBatteryState::Charging,
+                2 => UpowerBatteryState::Discharging,
+                3 => UpowerBatteryState::Empty,
+                4 => UpowerBatteryState::Full,
+                5 => UpowerBatteryState::NotCharging,
+                6 => UpowerBatteryState::Discharging,
+                _ => UpowerBatteryState::Unknown,
+            },
+            None => {
+                return Err(::std::io::Error::new(
+                    ::std::io::ErrorKind::Other,
+                    "no such upower device",
+                ));
+            }
+        };
+
+        Ok(UpowerBattery {
+            device_path,
+            inner: Arc::new(Mutex::new(UpowerBatteryInner {
+                capacity: capacity,
+                state: state,
+            })),
+        })
+    }
+
+    pub fn new(
+        font_size: f32,
+        length: u32,
+        sender: Sender<Cmd>,
+    ) -> Result<Box<BarWidget>, ::std::io::Error> {
+        BarWidget::new(font_size, length, move |dirty| {
+            let d = UpowerBattery::from_device("BAT0")?;
+            let path = d.device_path.clone();
+            let inner = d.inner.clone();
+            let _ = thread::Builder::new()
+                .name("battery_monitor".to_string())
+                .spawn(move || {
+                    let con = dbus::Connection::get_private(dbus::BusType::System)
+                        .expect("Failed to establish D-Bus connection.");
+                    let rule = format!(
+                        "type='signal',\
+                         path='{}',\
+                         interface='org.freedesktop.DBus.Properties',\
+                         member='PropertiesChanged'",
+                        path
+                    );
+
+                    // First we're going to get an (irrelevant) NameAcquired event.
+                    con.incoming(10_000).next();
+
+                    con.add_match(&rule)
+                        .expect("Failed to add D-Bus match rule.");
+
+                    loop {
+                        if con.incoming(10_000).next().is_some() {
+                            let capacity = get_upower_property(&con, &path, "Percentage")
+                                .unwrap()
+                                .get1::<dbus::arg::Variant<f64>>()
+                                .unwrap()
+                                .0;
+                            let state = match get_upower_property(&con, &path, "State")
+                                .unwrap()
+                                .get1::<dbus::arg::Variant<u32>>()
+                                .unwrap()
+                                .0
+                            {
+                                1 => UpowerBatteryState::Charging,
+                                2 => UpowerBatteryState::Discharging,
+                                3 => UpowerBatteryState::Empty,
+                                4 => UpowerBatteryState::Full,
+                                5 => UpowerBatteryState::NotCharging,
+                                6 => UpowerBatteryState::Discharging,
+                                _ => UpowerBatteryState::Unknown,
+                            };
+                            let mut inner = inner.lock().unwrap();
+                            inner.state = state;
+                            inner.capacity = capacity;
+                            *dirty.lock().unwrap() = true;
+                            sender.send(Cmd::Draw).unwrap();
+                        }
+                    }
+                });
+
+            Ok(Box::new(d))
+        })
+    }
+}
+
+impl BarWidgetImpl for UpowerBattery {
+    fn name(&self) -> &str {
+        "battery"
+    }
+    fn value(&self) -> f32 {
+        let inner = self.inner.lock().unwrap();
+        (inner.capacity as f32) / 100.0
+    }
+    fn color(&self) -> Color {
+        let inner = self.inner.lock().unwrap();
+        match inner.state {
+            UpowerBatteryState::Discharging | UpowerBatteryState::Unknown => {
+                if inner.capacity > 10.0 {
+                    Color::new(1.0, 1.0, 1.0, 1.0)
+                } else {
+                    Color::new(1.0, 0.5, 0.0, 1.0)
+                }
+            }
+            UpowerBatteryState::Charging | UpowerBatteryState::Full => {
+                Color::new(0.5, 1.0, 0.5, 1.0)
+            }
+            UpowerBatteryState::NotCharging | UpowerBatteryState::Empty => {
+                Color::new(1.0, 0.5, 0.5, 1.0)
+            }
+        }
+    }
+    fn inc(&mut self, _: f32) {}
+    fn set(&mut self, _: f32) {}
+    fn toggle(&mut self) {}
+}

src/widgets/calendar.rs

@@ -0,0 +1,269 @@
+use crate::buffer::Buffer;
+use crate::color::Color;
+use crate::draw::{Font, DEJAVUSANS_MONO, ROBOTO_REGULAR};
+use crate::widget::{DrawContext, DrawReport, KeyState, ModifiersState, Widget};
+
+use chrono::{Date, Datelike, Local};
+
+pub struct Calendar {
+    cur_date: Date<Local>,
+    dirty: bool,
+    offset: f64,
+    sections: u32,
+    font_size: u32,
+    calendar_cache: Font,
+    month_cache: Font,
+    year_cache: Font,
+    day_cache: Font,
+}
+
+impl Calendar {
+    fn draw_month(
+        &self,
+        buf: &mut Buffer,
+        background_color: &Color,
+        orig: &Date<Local>,
+        time: &Date<Local>,
+    ) -> Result<(i32, i32, i32, i32), ::std::io::Error> {
+        let mut time = time.clone();
+        let mut y_off = 1;
+        let mut done = false;
+
+        let month_str = match time.month() {
+            1 => "January",
+            2 => "February",
+            3 => "March",
+            4 => "April",
+            5 => "May",
+            6 => "June",
+            7 => "July",
+            8 => "August",
+            9 => "September",
+            10 => "October",
+            11 => "November",
+            12 => "December",
+            _ => panic!("impossible value"),
+        };
+
+        //
+        // Draw the of the month
+        //
+
+        self.month_cache.draw_text(
+            buf,
+            background_color,
+            &Color::new(1.0, 1.0, 1.0, 1.0),
+            month_str,
+        )?;
+        if time.year() != orig.year() {
+            self.year_cache.draw_text(
+                &mut buf.offset((self.font_size * 20, 0))?,
+                background_color,
+                &Color::new(0.8, 0.8, 0.8, 1.0),
+                &format!("{:}", time.year()),
+            )?;
+        }
+
+        //
+        // Draw the week day
+        //
+
+        for idx in 1..8 {
+            let wk_chr = match idx {
+                1 => "MON",
+                2 => "TUE",
+                3 => "WED",
+                4 => "THU",
+                5 => "FRI",
+                6 => "SAT",
+                7 => "SUN",
+                _ => panic!("impossible value"),
+            };
+
+            self.day_cache.draw_text(
+                &mut buf.offset((
+                    idx * self.font_size * 3 + self.font_size / 5,
+                    y_off * self.font_size * 2 + self.font_size * 4,
+                ))?,
+                background_color,
+                &Color::new(1.0, 1.0, 1.0, 1.0),
+                &wk_chr,
+            )?;
+        }
+
+        y_off += 1;
+
+        while !done {
+            let mut x_pos = 0;
+
+            //
+            // Find the start of this week
+            //
+            let mut wkday = time.weekday();
+            while wkday != chrono::Weekday::Mon {
+                x_pos += 1;
+                wkday = wkday.pred();
+            }
+
+            //
+            // Draw the week number
+            //
+            let wk = time.iso_week();
+            self.calendar_cache.draw_text(
+                &mut buf.offset((0, y_off * self.font_size * 2 + self.font_size * 4))?,
+                background_color,
+                &Color::new(0.75, 0.75, 0.75, 1.0),
+                &format!("{:02}", wk.week()),
+            )?;
+            x_pos += 1;
+
+            //
+            // Draw the dates
+            //
+            while x_pos < 8 {
+                let c = if time.day() == orig.day() && time.month() == orig.month() {
+                    Color::new(1.0, 1.0, 1.0, 1.0)
+                } else {
+                    Color::new(0.5, 0.5, 0.5, 1.0)
+                };
+
+                self.calendar_cache.draw_text(
+                    &mut buf.offset((
+                        x_pos * self.font_size * 3,
+                        y_off * self.font_size * 2 + self.font_size * 4,
+                    ))?,
+                    background_color,
+                    &c,
+                    &format!("{:02}", time.day()),
+                )?;
+
+                let t = time.with_day(time.day() + 1);
+                if t.is_none() {
+                    done = true;
+                    break;
+                }
+                time = t.unwrap();
+                x_pos += 1;
+            }
+
+            y_off += 1;
+        }
+        Ok(buf.get_signed_bounds())
+    }
+}
+
+impl Calendar {
+    pub fn new(font_size: f32, sections: u32) -> Box<Calendar> {
+        let mut calendar_cache = Font::new(&DEJAVUSANS_MONO, font_size * 2.0);
+        calendar_cache.add_str_to_cache("0123456789");
+        let mut month_cache = Font::new(&ROBOTO_REGULAR, font_size * 4.0);
+        month_cache.add_str_to_cache("JanuryFebMchApilJgstSmOoNvD");
+        let mut year_cache = Font::new(&DEJAVUSANS_MONO, font_size * 1.5);
+        year_cache.add_str_to_cache("-0123456789");
+        let mut day_cache = Font::new(&DEJAVUSANS_MONO, font_size);
+        day_cache.add_str_to_cache("MONTUEWDHFRISA");
+        Box::new(Calendar {
+            cur_date: Local::now().date(),
+            dirty: true,
+            offset: 0.0,
+            sections: sections,
+            font_size: font_size as u32,
+            calendar_cache: calendar_cache,
+            month_cache: month_cache,
+            year_cache: year_cache,
+            day_cache: day_cache,
+        })
+    }
+}
+
+impl Widget for Calendar {
+    fn enter(&mut self) {}
+    fn leave(&mut self) {}
+
+    fn size(&self) -> (u32, u32) {
+        let cal_width = 7 * self.font_size * 3 + self.font_size * 2;
+        let cal_pad = self.font_size * 3;
+        (
+            cal_width * self.sections + cal_pad * (self.sections - 1),
+            (self.font_size as f32 * 21.5) as u32,
+        )
+    }
+
+    fn draw(
+        &mut self,
+        ctx: &mut DrawContext,
+        pos: (u32, u32),
+    ) -> Result<DrawReport, ::std::io::Error> {
+        let (width, height) = self.size();
+        if ctx.time.date() == self.cur_date && !ctx.force && !self.dirty {
+            return Ok(DrawReport::empty(width, height));
+        }
+        self.dirty = false;
+        self.cur_date = ctx.time.date();
+
+        let buf = &mut ctx.buf.subdimensions((pos.0, pos.1, width, height))?;
+        buf.memset(ctx.bg);
+        let time = ctx.time.date();
+        let mut t = time.with_day(1).unwrap();
+        let o = (self.offset / 100.0) as i32;
+
+        let cals = self.sections - 1;
+        let pre_cals = cals / 2;
+        for _ in 0..pre_cals {
+            t = t.pred().with_day(1).unwrap();
+        }
+
+        if o != 0 {
+            let mut month = (t.month() - 1) as i32 + o;
+            let mut year = t.year();
+            while month > 11 {
+                year += 1;
+                month -= 12;
+            }
+            while month < 0 {
+                year -= 1;
+                month += 12;
+            }
+            t = t
+                .with_year(year)
+                .unwrap()
+                .with_month((month + 1) as u32)
+                .unwrap();
+        }
+        let cal_pad = 7 * self.font_size * 3 + self.font_size * 5;
+        for idx in 0..self.sections {
+            self.draw_month(&mut buf.offset((cal_pad * idx, 0))?, ctx.bg, &time, &t)?;
+
+            t = if t.month() == 12 {
+                t.with_year(t.year() + 1).unwrap().with_month(1).unwrap()
+            } else {
+                t.with_month(t.month() + 1).unwrap()
+            };
+        }
+        Ok(DrawReport {
+            width: width,
+            height: height,
+            damage: vec![buf.get_signed_bounds()],
+            full_damage: false,
+        })
+    }
+
+    fn keyboard_input(&mut self, _: u32, _: ModifiersState, _: KeyState, _: Option<String>) {}
+    fn mouse_click(&mut self, _: u32, (x, _): (u32, u32)) {
+        let cal_pad = 7 * self.font_size * 3 + self.font_size * 5;
+        let cals = self.sections - 1;
+        let pre_cals = cals / 2;
+        if x < pre_cals * cal_pad {
+            self.offset -= 100.0;
+        } else if x >= (pre_cals + 1) * cal_pad {
+            self.offset += 100.0;
+        } else {
+            self.offset = 0.0;
+        }
+        self.dirty = true;
+    }
+    fn mouse_scroll(&mut self, (_, y): (f64, f64), _: (u32, u32)) {
+        self.offset += y;
+        self.dirty = true;
+    }
+}

src/widgets/clock.rs

@@ -0,0 +1,96 @@
+use crate::cmd::Cmd;
+use crate::color::Color;
+use crate::draw::{Font, ROBOTO_REGULAR};
+use crate::widget::{DrawContext, DrawReport, KeyState, ModifiersState, Widget};
+
+use std::sync::mpsc::Sender;
+
+use chrono::{DateTime, Datelike, Duration, Local, Timelike};
+
+pub struct Clock {
+    cur_time: DateTime<Local>,
+    clock_cache: Font,
+    size: f32,
+}
+
+impl Clock {
+    pub fn new(size: f32, ch: Sender<Cmd>) -> Box<Clock> {
+        let _ = std::thread::Builder::new()
+            .name("clock_ticker".to_string())
+            .spawn(move || loop {
+                let n = Local::now();
+                let target = (n + Duration::seconds(60))
+                    .with_second(0)
+                    .unwrap()
+                    .with_nanosecond(0)
+                    .unwrap();
+
+                let d = target - n;
+
+                std::thread::sleep(d.to_std().unwrap());
+                ch.send(Cmd::Draw).unwrap();
+            });
+
+        let mut clock_cache = Font::new(&ROBOTO_REGULAR, size);
+        clock_cache.add_str_to_cache("0123456789:");
+
+        let time = Local::now();
+
+        Box::new(Clock {
+            cur_time: time.with_year(time.year().saturating_sub(1)).unwrap(),
+            clock_cache: clock_cache,
+            size: size,
+        })
+    }
+}
+
+impl Widget for Clock {
+    fn enter(&mut self) {}
+    fn leave(&mut self) {}
+    fn size(&self) -> (u32, u32) {
+        let digit = (self.size * 0.45).ceil() as u32;
+        let colon = (self.size * 0.20).ceil() as u32;
+        (digit * 4 + colon, self.size.ceil() as u32)
+    }
+
+    fn draw(
+        &mut self,
+        ctx: &mut DrawContext,
+        pos: (u32, u32),
+    ) -> Result<DrawReport, ::std::io::Error> {
+        let (width, height) = self.size();
+        if !(ctx.time.date() != self.cur_time.date()
+            || ctx.time.hour() != self.cur_time.hour()
+            || ctx.time.minute() != self.cur_time.minute()
+            || ctx.force)
+        {
+            return Ok(DrawReport::empty(width, height));
+        }
+
+        self.cur_time = ctx.time.clone();
+
+        let buf = &mut ctx.buf.subdimensions((pos.0, pos.1, width, height))?;
+        buf.memset(ctx.bg);
+
+        let digit = (self.size * 0.45).ceil() as u32;
+        let colon = (self.size * 0.20).ceil() as u32;
+        self.clock_cache.draw_text_fixed_width(
+            buf,
+            ctx.bg,
+            &Color::new(1.0, 1.0, 1.0, 1.0),
+            &[digit, digit, colon, digit, digit],
+            &format!("{:02}:{:02}", ctx.time.hour(), ctx.time.minute()),
+        )?;
+
+        Ok(DrawReport {
+            width: width,
+            height: height,
+            damage: vec![(pos.0 as i32, pos.1 as i32, width as i32, height as i32)],
+            full_damage: false,
+        })
+    }
+
+    fn keyboard_input(&mut self, _: u32, _: ModifiersState, _: KeyState, _: Option<String>) {}
+    fn mouse_click(&mut self, _: u32, _: (u32, u32)) {}
+    fn mouse_scroll(&mut self, _: (f64, f64), _: (u32, u32)) {}
+}

src/widgets/date.rs

@@ -0,0 +1,75 @@
+use crate::color::Color;
+use crate::draw::{Font, ROBOTO_REGULAR};
+use crate::widget::{DrawContext, DrawReport, KeyState, ModifiersState, Widget};
+
+use chrono::{DateTime, Datelike, Local};
+
+pub struct Date {
+    cur_time: DateTime<Local>,
+    date_cache: Font,
+    size: f32,
+}
+
+impl Date {
+    pub fn new(size: f32) -> Box<Date> {
+        let mut date_cache = Font::new(&ROBOTO_REGULAR, size);
+        date_cache
+            .add_str_to_cache("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789,/ ");
+
+        let time = Local::now();
+
+        Box::new(Date {
+            cur_time: time.with_year(time.year().saturating_sub(1)).unwrap(),
+            date_cache: date_cache,
+            size: size,
+        })
+    }
+}
+
+impl Widget for Date {
+    fn enter(&mut self) {}
+    fn leave(&mut self) {}
+    fn size(&self) -> (u32, u32) {
+        ((6.5 * self.size).ceil() as u32, self.size.ceil() as u32)
+    }
+
+    fn draw(
+        &mut self,
+        ctx: &mut DrawContext,
+        pos: (u32, u32),
+    ) -> Result<DrawReport, ::std::io::Error> {
+        let (width, height) = self.size();
+
+        if !(ctx.time.date() != self.cur_time.date() || ctx.force) {
+            return Ok(DrawReport::empty(width, height));
+        }
+
+        self.cur_time = ctx.time.clone();
+
+        let buf = &mut ctx.buf.subdimensions((pos.0, pos.1, width, height))?;
+        buf.memset(ctx.bg);
+        self.date_cache.draw_text(
+            buf,
+            ctx.bg,
+            &Color::new(1.0, 1.0, 1.0, 1.0),
+            &format!(
+                "{:?}, {:02}/{:02}/{:4}",
+                ctx.time.weekday(),
+                ctx.time.day(),
+                ctx.time.month(),
+                ctx.time.year()
+            ),
+        )?;
+
+        Ok(DrawReport {
+            width: width,
+            height: height,
+            damage: vec![(pos.0 as i32, pos.1 as i32, width as i32, height as i32)],
+            full_damage: false,
+        })
+    }
+
+    fn keyboard_input(&mut self, _: u32, _: ModifiersState, _: KeyState, _: Option<String>) {}
+    fn mouse_click(&mut self, _: u32, _: (u32, u32)) {}
+    fn mouse_scroll(&mut self, _: (f64, f64), _: (u32, u32)) {}
+}

src/widgets/launcher.rs

@@ -0,0 +1,371 @@
+use crate::buffer::Buffer;
+use crate::cmd::Cmd;
+use crate::color::Color;
+use crate::desktop::{load_desktop_files, Desktop};
+use crate::draw::{Font, ROBOTO_REGULAR};
+use crate::widget::{DrawContext, DrawReport, KeyState, ModifiersState, Widget};
+
+use std::cell::RefCell;
+use std::cmp::Ordering;
+use std::process::Command;
+use std::sync::mpsc::Sender;
+
+use fuzzy_matcher::skim::{fuzzy_indices, fuzzy_match};
+use smithay_client_toolkit::keyboard::keysyms;
+
+pub struct Launcher {
+    options: Vec<Desktop>,
+    term_opener: String,
+    app_opener: String,
+    url_opener: String,
+    matches: Vec<Desktop>,
+    input: String,
+    result: Option<String>,
+    offset: usize,
+    font: RefCell<Font>,
+    font_size: u32,
+    length: u32,
+    dirty: bool,
+    tx: Sender<Cmd>,
+}
+
+impl Launcher {
+    pub fn new(
+        font_size: f32,
+        length: u32,
+        listener: Sender<Cmd>,
+        app: String,
+        term: String,
+        url: String,
+    ) -> Box<Launcher> {
+        Box::new(Launcher {
+            options: load_desktop_files(),
+            term_opener: term,
+            app_opener: app,
+            url_opener: url,
+            matches: vec![],
+            input: "".to_string(),
+            result: None,
+            offset: 0,
+            font: RefCell::new(Font::new(&ROBOTO_REGULAR, font_size)),
+            font_size: font_size as u32,
+            length: length,
+            dirty: true,
+            tx: listener,
+        })
+    }
+
+    fn draw_launcher(&self, buf: &mut Buffer, bg: &Color) -> Result<(), ::std::io::Error> {
+        let mut x_off = if self.input.len() > 0 {
+            let c = if self.matches.len() == 0 {
+                Color::new(1.0, 0.5, 0.5, 1.0)
+            } else {
+                Color::new(1.0, 1.0, 1.0, 1.0)
+            };
+            let dim = self
+                .font
+                .borrow_mut()
+                .auto_draw_text(buf, bg, &c, &self.input)?;
+
+            dim.0 + self.font_size / 4
+        } else {
+            0
+        };
+
+        let mut width_remaining: i32 = (self.length - x_off) as i32;
+        for (idx, m) in self.matches.iter().enumerate() {
+            let mut b = match buf.offset((x_off, 0)) {
+                Ok(b) => b,
+                Err(_) => break,
+            };
+            let size = if idx == self.offset && self.input.len() > 0 {
+                let (_, indices) =
+                    fuzzy_indices(&m.name.to_lowercase(), &self.input.to_lowercase()).unwrap();
+                let mut colors = Vec::with_capacity(m.name.len());
+                for pos in 0..m.name.len() {
+                    if indices.contains(&pos) {
+                        colors.push(Color::new(1.0, 1.0, 1.0, 1.0));
+                    } else {
+                        colors.push(Color::new(0.75, 0.75, 0.75, 1.0));
+                    }
+                }
+                self.font
+                    .borrow_mut()
+                    .auto_draw_text_individual_colors(&mut b, bg, &colors, &m.name)?
+            } else {
+                self.font.borrow_mut().auto_draw_text(
+                    &mut b,
+                    bg,
+                    &Color::new(0.5, 0.5, 0.5, 1.0),
+                    &m.name,
+                )?
+            };
+
+            x_off += size.0 + self.font_size / 2;
+            width_remaining -= (size.0 + self.font_size / 2) as i32;
+
+            if width_remaining < 0 {
+                break;
+            }
+        }
+
+        Ok(())
+    }
+
+    fn draw_calc(&self, buf: &mut Buffer, bg: &Color) -> Result<(), ::std::io::Error> {
+        let x_off = self
+            .font
+            .borrow_mut()
+            .auto_draw_text(buf, bg, &Color::new(1.0, 1.0, 0.0, 1.0), "=")?
+            .0
+            + self.font_size / 4;
+
+        let x_off = if self.input.len() > 0 {
+            let dim = self.font.borrow_mut().auto_draw_text(
+                &mut buf.offset((x_off, 0))?,
+                bg,
+                &Color::new(1.0, 1.0, 1.0, 1.0),
+                &self.input[1..],
+            )?;
+
+            x_off + dim.0 + self.font_size / 4
+        } else {
+            0
+        };
+
+        if let Some(result) = &self.result {
+            self.font.borrow_mut().auto_draw_text(
+                &mut buf.offset((x_off, 0))?,
+                bg,
+                &Color::new(0.75, 0.75, 0.75, 1.0),
+                &format!(" = {:}", result),
+            )?;
+        }
+
+        Ok(())
+    }
+
+    fn draw_shell(&self, buf: &mut Buffer, bg: &Color) -> Result<(), ::std::io::Error> {
+        let x_off = self
+            .font
+            .borrow_mut()
+            .auto_draw_text(
+                &mut buf.offset((0, 0))?,
+                bg,
+                &Color::new(1.0, 1.0, 0.0, 1.0),
+                "!",
+            )?
+            .0
+            + self.font_size / 4;
+
+        if self.input.len() > 0 {
+            self.font.borrow_mut().auto_draw_text(
+                &mut buf.offset((x_off, 0))?,
+                bg,
+                &Color::new(1.0, 1.0, 1.0, 1.0),
+                &self.input[1..],
+            )?;
+        };
+
+        Ok(())
+    }
+}
+
+fn calc(s: &str) -> Result<String, String> {
+    rcalc_lib::parse::eval(s, &mut rcalc_lib::parse::CalcState::new())
+        .map(|x| format!("{}", x).to_string())
+        .map_err(|x| format!("{}", x).to_string())
+}
+
+fn wlcopy(s: &str) -> Result<(), String> {
+    use wl_clipboard_rs::copy::{MimeType, Options, Source};
+    use failure::Fail;
+    let opts = Options::new();
+    opts.copy(Source::Bytes(s.as_bytes()), MimeType::Text).map_err(|e|e.name().unwrap_or("unknown error").to_string())
+}
+
+impl Widget for Launcher {
+    fn enter(&mut self) {}
+    fn leave(&mut self) {
+        self.input = "".to_string();
+        self.offset = 0;
+        self.result = None;
+        self.dirty = true;
+    }
+
+    fn size(&self) -> (u32, u32) {
+        (self.length, self.font_size)
+    }
+
+    fn draw(
+        &mut self,
+        ctx: &mut DrawContext,
+        pos: (u32, u32),
+    ) -> Result<DrawReport, ::std::io::Error> {
+        let (width, height) = self.size();
+        if !self.dirty && !ctx.force {
+            return Ok(DrawReport::empty(width, height));
+        }
+        self.dirty = false;
+
+        match self.input.chars().next() {
+            Some('=') => {
+                if self.input.len() > 1 {
+                    match calc(&self.input.chars().skip(1).collect::<String>()) {
+                        Ok(v) => self.result = Some(v),
+                        Err(_) => self.result = None,
+                    }
+                }
+            }
+            Some('!') => (),
+            _ => {
+                let mut m = self
+                    .options
+                    .iter()
+                    .map(|x| {
+                        (
+                            fuzzy_match(&x.name.to_lowercase(), &self.input.to_lowercase()),
+                            x,
+                        )
+                    })
+                    .filter(|(x, _)| x.is_some())
+                    .map(|(x, y)| (x.unwrap(), y.clone()))
+                    .collect::<Vec<(i64, Desktop)>>();
+
+                m.sort_by(|(x1, y1), (x2, y2)| {
+                    if x1 > x2 {
+                        Ordering::Less
+                    } else if x1 < x2 {
+                        Ordering::Greater
+                    } else if y1.name.len() < y2.name.len() {
+                        Ordering::Less
+                    } else if y1.name.len() > y2.name.len() {
+                        Ordering::Greater
+                    } else {
+                        y1.cmp(y2)
+                    }
+                });
+
+                self.matches = m.into_iter().map(|(_, x)| x).collect();
+            }
+        };
+
+        let buf = &mut ctx.buf.subdimensions((pos.0, pos.1, width, height))?;
+        buf.memset(ctx.bg);
+
+        match self.input.chars().next() {
+            Some('=') => self.draw_calc(buf, ctx.bg),
+            Some('!') => self.draw_shell(buf, ctx.bg),
+            _ => self.draw_launcher(buf, ctx.bg),
+        }?;
+
+        Ok(DrawReport {
+            width: width,
+            height: height,
+            damage: vec![buf.get_signed_bounds()],
+            full_damage: false,
+        })
+    }
+
+    fn keyboard_input(
+        &mut self,
+        key: u32,
+        modifiers: ModifiersState,
+        _: KeyState,
+        interpreted: Option<String>,
+    ) {
+        match key {
+            keysyms::XKB_KEY_u if modifiers.ctrl => self.leave(),
+            keysyms::XKB_KEY_BackSpace => {
+                if self.input.len() > 0 {
+                    self.input = self.input[..self.input.len() - 1].to_string();
+                    self.offset = 0;
+                    self.result = None;
+                    self.dirty = true
+                }
+            }
+            keysyms::XKB_KEY_Return => {
+                match self.input.chars().next() {
+                    Some('=') => match self.result {
+                        Some(ref v) => {
+                            let _ = wlcopy(&v);
+                        }
+                        None => (),
+                    },
+                    Some('!') => {
+                        let _ = Command::new("sh")
+                            .arg("-c")
+                            .arg(self.input.chars().skip(1).collect::<String>())
+                            .spawn();
+                        self.tx.send(Cmd::Exit).unwrap();
+                    }
+                    _ => {
+                        if self.matches.len() > self.offset {
+                            let d = &self.matches[self.offset];
+                            if let Some(exec) = &d.exec {
+                                let exec = exec
+                                    .replace("%f", "")
+                                    .replace("%F", "")
+                                    .replace("%u", "")
+                                    .replace("%U", "");
+                                let prefix = if d.term {
+                                    &self.term_opener
+                                } else {
+                                    &self.app_opener
+                                };
+
+                                let lexed = if prefix.len() > 0 {
+                                    let mut prefix = shlex::split(prefix).unwrap();
+                                    prefix.push(exec);
+                                    prefix
+                                } else {
+                                    shlex::split(&exec).unwrap()
+                                };
+                                if lexed.len() > 0 {
+                                    let _ =
+                                        Command::new(lexed[0].clone()).args(&lexed[1..]).spawn();
+                                    self.tx.send(Cmd::Exit).unwrap();
+                                }
+                            }
+                            if let Some(url) = &d.url {
+                                if self.url_opener.len() > 0 {
+                                    let mut lexed = shlex::split(&self.url_opener).unwrap();
+                                    lexed.push(url.to_string());
+                                    if lexed.len() > 0 {
+                                        let _ = Command::new(lexed[0].clone())
+                                            .args(&lexed[1..])
+                                            .spawn();
+                                        self.tx.send(Cmd::Exit).unwrap();
+                                    }
+                                }
+                            }
+                        }
+                    }
+                };
+            }
+            keysyms::XKB_KEY_Right => {
+                if self.matches.len() > 0 && self.offset < self.matches.len() - 1 {
+                    self.offset += 1;
+                    self.dirty = true;
+                }
+            }
+            keysyms::XKB_KEY_Left => {
+                if self.matches.len() > 0 && self.offset > 0 {
+                    self.offset -= 1;
+                    self.dirty = true;
+                }
+            }
+            _ => match interpreted {
+                Some(v) => {
+                    self.input += &v;
+                    self.offset = 0;
+                    self.result = None;
+                    self.dirty = true;
+                }
+                None => {}
+            },
+        }
+    }
+    fn mouse_click(&mut self, _: u32, _: (u32, u32)) {}
+    fn mouse_scroll(&mut self, _: (f64, f64), _: (u32, u32)) {}
+}

src/widgets/mod.rs

@@ -0,0 +1,10 @@
+pub mod backlight;
+pub mod bar_widget;
+pub mod battery;
+pub mod calendar;
+pub mod clock;
+pub mod date;
+pub mod launcher;
+
+#[cfg(any(feature = "alsa-widget", feature = "pulseaudio-widget"))]
+pub mod audio;