Update

Cargo.toml

@@ -4,14 +4,15 @@ version = "0.1.0"
 authors = ["Julian Ospald <hasufell@posteo.de>"]
 
 [dependencies]
-alsa = "0.1.8"
-libc = "0.2.23"
+alsa = "^0.1.8"
+libc = "^0.2.23"
 gdk-sys = { git = "https://github.com/gtk-rs/sys" }
 gtk-sys = { git = "https://github.com/gtk-rs/sys" }
 glib = { git = "https://github.com/gtk-rs/glib.git" }
-ffi = "0.0.2"
+ffi = "^0.0.2"
 flexi_logger = "^0.5.1"
-log = "0.3.8"
+log = "^0.3.8"
+error-chain = "^0.10.0"
 
 [dependencies.gtk]
 git = "https://github.com/gtk-rs/gtk.git"

src/audio.rs

@@ -7,6 +7,8 @@ use self::alsa::mixer::{Mixer, Selem, Elem};
 use alsa::mixer::SelemChannelId::*;
 use std::iter::Map;
 use self::libc::c_int;
+use errors::*;
+use std::convert::From;
 
 
 
@@ -22,39 +24,8 @@ pub fn get_alsa_cards() -> alsa::card::Iter {
     return alsa::card::Iter::new();
 }
 
-pub fn get_mixer(card: Card) -> Mixer {
-    let mixer = Mixer::new(&format!("hw:{}", card.get_index()), false).unwrap();
-
-    return mixer;
-}
-
-pub fn get_selems(mixer: &Mixer) -> Map<alsa::mixer::Iter, fn(Elem) -> Selem> {
-    return mixer.iter().map(get_selem);
-}
-
-pub fn get_selem_by_name<'a>(mixer: &'a Mixer, name: String) -> Option<Selem> {
-    for selem in get_selems(mixer) {
-        let m_name = selem.get_id()
-            .get_name()
-            .map(|y| String::from(y))
-            .ok();
-        let retval = m_name.map_or(false, |n| { return n == name; });
-
-        if retval {
-            return Some(selem);
-        }
-    }
-
-    return None;
-}
-
-pub fn get_vol(selem: Selem) -> Result<f64, alsa::Error> {
-    let (min, max) = selem.get_playback_volume_range();
-    let volume = selem.get_playback_volume(FrontRight).map(|v| {
-        return ((v - min) as f64) / ((max - min) as f64) * 100.0;
-    });
-
-    return volume;
+pub fn get_mixer(card: Card) -> Result<Mixer> {
+    return Mixer::new(&format!("hw:{}", card.get_index()), false).cherr();
 }
 
 pub fn get_selem(elem: Elem) -> Selem {
@@ -64,6 +35,26 @@ pub fn get_selem(elem: Elem) -> Selem {
     return Selem::new(elem).unwrap();
 }
 
-// pub fn list_channels(card: Card, hctl: HCtl) -> [str] {
+pub fn get_selems(mixer: &Mixer) -> Map<alsa::mixer::Iter, fn(Elem) -> Selem> {
+    return mixer.iter().map(get_selem);
+}
 
-// }
+pub fn get_selem_by_name<'a>(mixer: &'a Mixer, name: String) -> Result<Selem> {
+    for selem in get_selems(mixer) {
+        let n = selem.get_id().get_name().map(|y| String::from(y))?;
+
+        if n == name {
+            return Ok(selem);
+        }
+    }
+    bail!("Not found a matching selem named {}", name);
+}
+
+pub fn get_vol(selem: Selem) -> Result<f64> {
+    let (min, max) = selem.get_playback_volume_range();
+    let volume = selem.get_playback_volume(FrontRight).map(|v| {
+        return ((v - min) as f64) / ((max - min) as f64) * 100.0;
+    });
+
+    return volume.cherr();
+}

src/errors.rs

@@ -0,0 +1,53 @@
+use alsa;
+use std;
+use std::convert::From;
+
+error_chain! {
+    foreign_links {
+        Alsa(alsa::Error);
+    }
+
+}
+
+pub trait CHErr {
+    type Item;
+    fn cherr(self) -> Result<Self::Item>;
+}
+
+impl<A, E: std::error::Error> CHErr for std::result::Result<A, E>
+        where Error: std::convert::From<E> {
+    type Item = A;
+    fn cherr(self) -> Result<Self::Item> {
+        return self.map_err(From::from);
+    }
+}
+
+
+#[macro_export]
+macro_rules! try_w {
+    ($expr:expr) => {
+        try_wr!($expr, ())
+    };
+    ($expr:expr, $fmt:expr, $($arg:tt)+) => {
+        try_wr!($expr, (), $fmt, $(arg)+)
+    }
+}
+
+#[macro_export]
+macro_rules! try_wr {
+    ($expr:expr, $ret:expr) => (match $expr {
+        std::result::Result::Ok(val) => val,
+        std::result::Result::Err(err) => {
+            warn!("{:?}", err);
+            return $ret;
+        },
+    });
+    ($expr:expr, $ret:expr, $fmt:expr, $($arg:tt)+) => (match $expr {
+        std::result::Result::Ok(val) => val,
+        std::result::Result::Err(err) => {
+            warn!("Original error: {:?}", err);
+            warn!(format!($fmt, $(arg)+));
+            return $ret;
+        },
+    })
+}

src/gui.rs

@@ -6,6 +6,8 @@ extern crate glib;
 extern crate ffi;
 extern crate libc;
 
+
+use errors::*;
 use gtk::prelude::*;
 use gdk::DeviceExt;
 use gdk::{GrabOwnership, GrabStatus, BUTTON_PRESS_MASK, KEY_PRESS_MASK};
@@ -15,44 +17,48 @@ pub fn set_slider(vol_scale_adj: &gtk::Adjustment, scale: f64) {
     vol_scale_adj.set_value(scale);
 }
 
-pub fn grab_devices(window: &gtk::Window) {
-    let m_device = gtk::get_current_event_device();
-    if m_device.is_none() {
-        warn!("Couldn't get current device");
-        return;
-    }
+pub fn grab_devices(window: &gtk::Window) -> Result<()> {
+    let device = gtk::get_current_event_device().ok_or("No current device")?;
 
-    let device = m_device.unwrap();
-    let gdk_window = window.get_window().unwrap();
+    let gdk_window = window.get_window().ok_or("No window?!")?;
 
     /* Grab the mouse */
-    let m_grab_status =
-        device.grab(&gdk_window,
+    let m_grab_status = device.grab(
+        &gdk_window,
         GrabOwnership::None,
         true,
         BUTTON_PRESS_MASK,
         None,
-                    GDK_CURRENT_TIME as u32);
+        GDK_CURRENT_TIME as u32,
+    );
 
     if m_grab_status != GrabStatus::Success {
-        warn!("Could not grab {}", device.get_name().unwrap());
+        warn!(
+            "Could not grab {}",
+            device.get_name().unwrap_or(String::from("UNKNOWN DEVICE"))
+        );
     }
 
     /* Grab the keyboard */
-    let m_k_dev = device.get_associated_device();
-    if m_k_dev.is_none() {
-        warn!("Couldn't get associated device");
-        return;
-    }
-    let k_dev = m_k_dev.unwrap();
+    let k_dev = device.get_associated_device().ok_or(
+        "Couldn't get associated device",
+    )?;
 
-    let k_grab_status = k_dev.grab(&gdk_window,
+    let k_grab_status = k_dev.grab(
+        &gdk_window,
         GrabOwnership::None,
         true,
         KEY_PRESS_MASK,
         None,
-                                   GDK_CURRENT_TIME as u32);
+        GDK_CURRENT_TIME as u32,
+    );
     if k_grab_status != GrabStatus::Success {
-        warn!("Could not grab {}", k_dev.get_name().unwrap())
+        warn!(
+            "Could not grab {}",
+            k_dev.get_name().unwrap_or(String::from("UNKNOWN DEVICE"))
+        );
     }
+
+    return Ok(());
 }
+

src/main.rs

@@ -2,6 +2,9 @@ extern crate flexi_logger;
 #[macro_use]
 extern crate log;
 
+#[macro_use]
+extern crate error_chain;
+
 extern crate gtk;
 extern crate gtk_sys;
 extern crate gdk;
@@ -19,9 +22,12 @@ use gtk::prelude::*;
 
 use gdk_sys::GDK_KEY_Escape;
 
+#[macro_use]
+mod errors;
 
 mod audio;
 mod gui;
+mod debug;
 
 
 fn main() {
@@ -39,10 +45,10 @@ fn main() {
     let builder_popup = gtk::Builder::new_from_string(glade_src);
 
     {
-        let popup_window: gtk::Window = builder_popup.get_object("popup_window")
-            .unwrap();
-        let vol_scale: gtk::Scale = builder_popup.get_object("vol_scale")
-            .unwrap();
+        let popup_window: gtk::Window =
+            builder_popup.get_object("popup_window").unwrap();
+        let vol_scale: gtk::Scale =
+            builder_popup.get_object("vol_scale").unwrap();
 
         tray_icon.connect_activate(move |_| if popup_window.get_visible() {
             popup_window.hide();
@@ -53,23 +59,25 @@ fn main() {
         });
     }
     {
-        let popup_window: gtk::Window = builder_popup.get_object("popup_window")
-            .unwrap();
-        let vol_scale_adj: gtk::Adjustment = builder_popup.get_object("vol_scale_adj")
-            .unwrap();
+        let popup_window: gtk::Window =
+            builder_popup.get_object("popup_window").unwrap();
+        let vol_scale_adj: gtk::Adjustment =
+            builder_popup.get_object("vol_scale_adj").unwrap();
         popup_window.connect_show(move |_| {
             let alsa_card = audio::get_default_alsa_card();
-            let mixer = audio::get_mixer(alsa_card);
-            let selem = audio::get_selem_by_name(&mixer,
-                                                 String::from("Master"))
-                    .unwrap();
-            gui::set_slider(&vol_scale_adj, audio::get_vol(selem).unwrap())
+            let mixer = try_w!(audio::get_mixer(alsa_card));
+            let selem = try_w!(audio::get_selem_by_name(
+                &mixer,
+                String::from("Master"),
+            ));
+            let cur_vol = try_w!(audio::get_vol(selem));
+            gui::set_slider(&vol_scale_adj, cur_vol);
         });
     }
 
     {
-        let popup_window: gtk::Window = builder_popup.get_object("popup_window")
-            .unwrap();
+        let popup_window: gtk::Window =
+            builder_popup.get_object("popup_window").unwrap();
         popup_window.connect_event(move |w, e| {
             match gdk::Event::get_event_type(e) {
                 gdk::EventType::GrabBroken => w.hide(),
@@ -80,7 +88,12 @@ fn main() {
                     }
                 }
                 gdk::EventType::ButtonPress => {
-                    let device = gtk::get_current_event_device().unwrap();
+                    let device = try_wr!(
+                        gtk::get_current_event_device().ok_or(
+                            "No current event device!",
+                        ),
+                        Inhibit(false)
+                    );
                     let (window, _, _) =
                         gdk::DeviceExt::get_window_at_position(&device);
                     if window.is_none() {