Try wl-clipboard-rs

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

Cargo.toml

@@ -8,24 +8,37 @@ edition = "2018"
 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"] }
-libpulse-binding = { version = "2.11"}
+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_json = "1.0"
+
 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 }

README.md

@@ -11,7 +11,7 @@ Consider this alpha-quality: While it works, *everything* is subject to change w
 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 `$XDG_CONFIG_HOME/wldash/config.json` (or if `XDG_CONFIG_HOME` is not set, `~/.config/wldash/config.json`).
+To see the default configuration, run `wldash print-config`. To configure, place a file in `$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.
 
@@ -62,4 +62,4 @@ The launcher also accepts prefix operators to change its mode:
 - Scaling of any kind - all sizes are currently hardcoded in pixels
 - Configurability
 - Cleanup and reorganization
-- Proper line editor for the launcher
+- Proper line editor for the launcher

config.json

@@ -34,10 +34,22 @@
 					}
 				]},
 				{"calendar": {"font_size": 16.0,"sections": 3}},
-				{"launcher": {"font_size": 32.0,"length": 1200}}
+				{"launcher": {
+					"font_size": 32.0,
+					"length": 1200, 
+	            "app_opener": "swaymsg exec ",
+	            "term_opener": "alacritty -e ",
+	            "url_opener": "xdg-open "
+	         }}
 			]}
 		}
 	},
 	"outputMode": "active",
-	"scale": 1
+	"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 "

src/app.rs

@@ -21,6 +21,7 @@ use crate::widget::{DrawContext, Widget};
 use crate::cmd::Cmd;
 use crate::doublemempool::DoubleMemPool;
 
+#[derive(Debug)]
 pub enum OutputMode {
     Active,
     All,
@@ -123,47 +124,49 @@ impl AppInner {
 
         self.configured_surfaces = Arc::new(Mutex::new(0));
 
-        if self.visible {
-            match self.output_mode {
-                OutputMode::Active => {
-                    if self.shell_surfaces.len() > 0 {
-                        return;
-                    }
+        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(),
-                        None,
+                        Some(&output.1),
                     );
-                    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;
+                    surfaces.push(surface);
+                    shell_surfaces.push(shell_surface);
                 }
+                self.surfaces = surfaces;
+                self.shell_surfaces = shell_surfaces;
             }
-            self.draw_tx.send(Cmd::ForceDraw).unwrap();
-        } else {
-            self.surfaces = Vec::new();
-            self.shell_surfaces = Vec::new();
         }
+        self.draw_tx.send(Cmd::ForceDraw).unwrap();
     }
 
     fn add_output(&mut self, id: u32, output: wl_output::WlOutput) {
@@ -203,13 +206,14 @@ pub struct App {
     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, mut force: bool) -> Result<(), ::std::io::Error> {
+    pub fn redraw(&mut self, force: bool) -> Result<(), ::std::io::Error> {
         let widget = match self.widget {
             Some(ref mut widget) => widget,
             None => return Ok(()),
@@ -218,7 +222,10 @@ impl App {
         let inner = self.inner.lock().unwrap();
         let time = Local::now();
 
-        if inner.shell_surfaces.len() != *inner.configured_surfaces.lock().unwrap() {
+        if !inner.visible
+            || inner.shell_surfaces.len() != *inner.configured_surfaces.lock().unwrap()
+            || inner.surfaces.len() == 0
+        {
             // Not ready yet
             return Ok(());
         }
@@ -230,6 +237,7 @@ impl App {
 
         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)
@@ -238,8 +246,8 @@ impl App {
         let mut buf = Buffer::new(mmap, size);
 
         // Copy old damage
-        if let Some(d) = &self.last_damage {
-            if !size_changed {
+        let force = match (force, &self.last_damage) {
+            (false, Some(d)) => {
                 let lastmmap = last.mmap();
                 let last = Buffer::new(lastmmap, size);
 
@@ -249,21 +257,18 @@ impl App {
                 for d in d {
                     last.copy_to(&mut buf, d.clone());
                 }
-            } else {
-                force = true;
+                false
             }
-        } else {
-            force = true;
-        }
+            _ => true,
+        };
 
-        let bg = Color::new(0.0, 0.0, 0.0, 0.9);
         if force {
-            buf.memset(&bg);
+            buf.memset(&self.bg);
         }
         let report = widget.draw(
             &mut DrawContext {
                 buf: &mut buf,
-                bg: &bg,
+                bg: &self.bg,
                 time: &time,
                 force,
             },
@@ -272,8 +277,9 @@ impl App {
 
         mmap.flush().unwrap();
 
-        if !size_changed && !report.full_damage && report.damage.len() == 0 {
+        if !force && !report.full_damage && report.damage.len() == 0 {
             // Nothing to do
+            self.pools.never_mind();
             return Ok(());
         }
 
@@ -310,9 +316,17 @@ impl App {
         Ok(())
     }
 
-    pub fn toggle_visible(&mut self) {
+    pub fn hide(&mut self) {
         let mut inner = self.inner.lock().unwrap();
-        inner.visible = !inner.visible;
+        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();
     }
 
@@ -337,7 +351,7 @@ impl App {
         self.redraw(true)
     }
 
-    pub fn new(tx: Sender<Cmd>, output_mode: OutputMode, scale: u32) -> App {
+    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)));
 
         //
@@ -422,6 +436,14 @@ impl App {
         // 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,
@@ -431,22 +453,19 @@ impl App {
             } => 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: ModifiersState {
-                            ctrl: false,
-                            alt: false,
-                            shift: false,
-                            caps_lock: false,
-                            logo: false,
-                            num_lock: false,
-                        },
+                        modifiers_state: modifiers_state.lock().unwrap().clone(),
                         interpreted: utf8,
                     }),
                 },
                 _ => (),
             },
+            KbEvent::Modifiers { modifiers } => *modifiers_state.lock().unwrap() = modifiers,
             _ => (),
         })
         .expect("Failed to map keyboard");
@@ -467,7 +486,6 @@ impl App {
             },
         ));
 
-        inner.lock().unwrap().outputs_changed();
         event_queue.sync_roundtrip().unwrap();
 
         //
@@ -543,6 +561,7 @@ impl App {
             cmd_queue: cmd_queue,
             pools: pools,
             widget: None,
+            bg: bg,
             inner: inner,
             last_damage: None,
             last_dim: (0, 0),

src/color.rs

@@ -1,4 +1,6 @@
-#[derive(Debug, Clone, Copy)]
+use serde::{Deserialize, Serialize};
+
+#[derive(Serialize, Deserialize, Debug, Clone, Copy, Default)]
 pub struct Color {
     red: f32,
     green: f32,
@@ -8,55 +10,27 @@ pub struct Color {
 
 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: if red > 1.0 {
-                1.0
-            } else if red < 0.0 {
-                0.0
-            } else {
-                red
-            },
-            green: if green > 1.0 {
-                1.0
-            } else if green < 0.0 {
-                0.0
-            } else {
-                green
-            },
-            blue: if blue > 1.0 {
-                1.0
-            } else if blue < 0.0 {
-                0.0
-            } else {
-                blue
-            },
-            opacity: if opacity > 1.0 {
-                1.0
-            } else if opacity < 0.0 {
-                0.0
-            } else {
-                opacity
-            },
+            red,
+            green,
+            blue,
+            opacity,
         }
     }
 
     pub fn blend(&self, other: &Color, ratio: f32) -> Color {
-        let ratio = if ratio > 1.0 {
-            1.0
-        } else if ratio < 0.0 {
-            0.0
-        } else {
-            ratio
-        };
+        let ratio = clamp_f32(ratio, 0.0, 1.0);
 
         Color {
-            red: self.red + ((other.red - self.red) * ratio),
-            green: self.green + ((other.green - self.green) * ratio),
-            blue: self.blue + ((other.blue - self.blue) * ratio),
-            opacity: self.opacity + ((other.opacity - self.opacity) * ratio),
+            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
@@ -64,3 +38,34 @@ impl Color {
             | ((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

@@ -1,4 +1,5 @@
 use crate::cmd::Cmd;
+use crate::color::Color;
 use crate::widget;
 use crate::widgets;
 use serde::{Deserialize, Serialize};
@@ -47,10 +48,16 @@ pub enum Widget {
         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 {
@@ -120,8 +127,16 @@ impl Widget {
                     Err(_) => None,
                 }
             }
+            #[cfg(feature = "pulseaudio-widget")]
             Widget::PulseAudio { font_size, length } => {
-                match widgets::sound::PulseAudio::new(font_size, length, tx.clone()) {
+                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,
                 }
@@ -146,9 +161,10 @@ impl Default for OutputMode {
 #[derive(Serialize, Deserialize, Debug)]
 #[serde(rename_all = "camelCase")]
 pub struct Config {
-    pub widget: Widget,
     pub output_mode: OutputMode,
     pub scale: u32,
+    pub background: Color,
+    pub widget: Widget,
 }
 
 impl Default for Config {
@@ -180,6 +196,7 @@ impl Default for Config {
                                     length: 600,
                                 }),
                             }),
+                            #[cfg(feature = "pulseaudio-widget")]
                             Box::new(Widget::Margin {
                                 margins: (0, 0, 0, 8),
                                 widget: Box::new(Widget::PulseAudio {
@@ -204,6 +221,7 @@ impl Default for Config {
             },
             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

@@ -27,7 +27,7 @@ impl Desktop {
                 enabled_escape: false,
             },
         )?;
-        match file.section(Some("Desktop Entry").to_owned()) {
+        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(),
@@ -45,7 +45,7 @@ impl Desktop {
     }
 
     fn parse_dir(d: &str) -> Result<Vec<Desktop>, Box<dyn Error>> {
-        let mut files: Vec<Desktop> = Vec::new();
+        let mut files: Vec<Desktop> = Vec::with_capacity(16);
         for entry in fs::read_dir(d)? {
             let entry = entry?;
             let path = entry.path();

src/doublemempool.rs

@@ -19,7 +19,7 @@ impl DoubleMemPool {
     pub fn pool(&mut self) -> Option<(&mut MemPool, &mut MemPool)> {
         let switch = self.switch;
         self.switch = !self.switch;
-        let (last, cur) = if switch {
+        let (last, cur) = if !switch {
             (&mut self.pool2, &mut self.pool1)
         } else {
             (&mut self.pool1, &mut self.pool2)
@@ -31,4 +31,8 @@ impl DoubleMemPool {
             Some((last, cur))
         }
     }
+
+    pub fn never_mind(&mut self) {
+        self.switch = !self.switch;
+    }
 }

src/main.rs

@@ -1,4 +1,3 @@
-use std::default::Default;
 use std::env;
 use std::fs::File;
 use std::io::{BufRead, BufReader, Read, Write};
@@ -14,6 +13,7 @@ mod buffer;
 mod cmd;
 mod color;
 mod config;
+mod configfmt;
 mod desktop;
 mod doublemempool;
 mod draw;
@@ -22,12 +22,15 @@ mod widgets;
 
 use app::{App, OutputMode};
 use cmd::Cmd;
+use config::Config;
+use configfmt::ConfigFmt;
 
 enum Mode {
     Start,
+    Daemonize,
     StartOrKill,
     ToggleVisible,
-    PrintConfig,
+    PrintConfig(ConfigFmt),
 }
 
 fn main() {
@@ -43,34 +46,69 @@ fn main() {
         },
     };
 
-    let config: config::Config = match File::open(config_home + "/config.json") {
-        Ok(f) => {
-            let reader = BufReader::new(f);
-            serde_json::from_reader(reader).unwrap()
-        }
-        Err(_) => Default::default(),
-    };
+    // 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 args: Vec<String> = env::args().collect();
-    let mode = match args.len() {
-        1 => Mode::Start,
-        2 => match args[1].as_str() {
-            "start" => Mode::Start,
+    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,
+            "print-config" => Mode::PrintConfig(fmt),
             s => {
-                eprintln!("unsupported sub-command {}", s);
-                std::process::exit(1);
+                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);
+                }
             }
         },
-        v => {
-            eprintln!("expected 0 or 1 arguments, got {}", v);
-            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 => {
@@ -93,8 +131,15 @@ fn main() {
                 std::process::exit(1);
             };
         }
-        Mode::PrintConfig => {
-            println!("{}", serde_json::to_string_pretty(&config).unwrap());
+        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);
         }
     }
@@ -107,6 +152,8 @@ fn main() {
         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();
@@ -118,7 +165,12 @@ fn main() {
         }
     });
 
-    let mut app = App::new(tx_draw, output_mode, scale);
+    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();
 
@@ -177,6 +229,7 @@ fn main() {
 
     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();
@@ -209,11 +262,26 @@ fn main() {
                     q.lock().unwrap().push_back(Cmd::Draw);
                 }
                 Cmd::ToggleVisible => {
-                    app.toggle_visible();
+                    visible = !visible;
+                    if visible {
+                        app.get_widget().enter();
+                        app.show();
+                    } else {
+                        app.hide();
+                        app.get_widget().leave();
+                    }
+                    app.flush_display();
                 }
                 Cmd::Exit => {
-                    let _ = std::fs::remove_file(socket_path);
-                    return;
+                    if daemon {
+                        visible = false;
+                        app.hide();
+                        app.get_widget().leave();
+                        app.flush_display();
+                    } else {
+                        let _ = std::fs::remove_file(socket_path);
+                        return;
+                    }
                 }
             },
             None => {

src/widget.rs

@@ -30,6 +30,8 @@ impl DrawReport {
 }
 
 pub trait Widget {
+    fn enter(&mut self);
+    fn leave(&mut self);
     fn size(&self) -> (u32, u32);
     fn draw(
         &mut self,
@@ -60,6 +62,16 @@ impl VerticalLayout {
 }
 
 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;
@@ -156,6 +168,16 @@ impl HorizontalLayout {
 }
 
 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;
@@ -258,6 +280,12 @@ impl Margin {
 }
 
 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();
         (
@@ -326,6 +354,12 @@ impl Fixed {
 }
 
 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
     }

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

@@ -245,7 +245,10 @@ impl PulseAudioClient {
                 conn.mainloop.borrow_mut().run().unwrap();
             });
 
-        if !rx1.recv().unwrap() || !rx2.recv().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",

src/widgets/bar_widget.rs

@@ -61,6 +61,8 @@ impl BarWidget {
 }
 
 impl Widget for BarWidget {
+    fn enter(&mut self) {}
+    fn leave(&mut self) {}
     fn size(&self) -> (u32, u32) {
         (self.length, self.font_size)
     }

src/widgets/calendar.rs

@@ -177,6 +177,9 @@ impl Calendar {
 }
 
 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;

src/widgets/clock.rs

@@ -45,8 +45,12 @@ impl Clock {
 }
 
 impl Widget for Clock {
+    fn enter(&mut self) {}
+    fn leave(&mut self) {}
     fn size(&self) -> (u32, u32) {
-        ((2.0 * self.size).ceil() as u32, self.size.ceil() as 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(
@@ -55,7 +59,6 @@ impl Widget for Clock {
         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()

src/widgets/date.rs

@@ -27,6 +27,8 @@ impl Date {
 }
 
 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)
     }

src/widgets/launcher.rs

@@ -101,8 +101,8 @@ impl Launcher {
                 )?
             };
 
-            x_off += size.0 + self.font_size / 4;
-            width_remaining -= (size.0 + self.font_size / 4) as i32;
+            x_off += size.0 + self.font_size / 2;
+            width_remaining -= (size.0 + self.font_size / 2) as i32;
 
             if width_remaining < 0 {
                 break;
@@ -178,20 +178,21 @@ fn calc(s: &str) -> Result<String, String> {
 }
 
 fn wlcopy(s: &str) -> Result<(), String> {
-    let mut child = std::process::Command::new("wl-copy")
-        .stdin(std::process::Stdio::null())
-        .stdout(std::process::Stdio::null())
-        .stderr(std::process::Stdio::null())
-        .arg(s)
-        .spawn()
-        .map_err(|_| "wl-copy not available".to_string())?;
-    child
-        .wait()
-        .map_err(|_| "unable to run wl-copy".to_string())?;
-    Ok(())
+    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)
     }
@@ -269,11 +270,12 @@ impl Widget for Launcher {
     fn keyboard_input(
         &mut self,
         key: u32,
-        _: ModifiersState,
+        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();

src/widgets/mod.rs

@@ -5,4 +5,6 @@ pub mod calendar;
 pub mod clock;
 pub mod date;
 pub mod launcher;
-pub mod sound;
+
+#[cfg(any(feature = "alsa-widget", feature = "pulseaudio-widget"))]
+pub mod audio;