Added hdmi sound option

src/lib.rs

@@ -10,6 +10,30 @@ pub fn resolution_to_string(res: (u32, u32)) -> String {
     format!("{}x{}", res.0, res.1).to_owned()
 }
 
+/// Sets the sound to the HDMI output.
+pub fn enable_hdmi_sound() -> Result<(), Error>{
+    Command::new("pactl")
+        .args(&[
+            "set-card-profile",
+            "0",
+            "output:hdmi-stereo",
+        ])
+        .output()?;
+    Ok(())
+}
+
+/// Disables the HDMI sound output.
+pub fn disable_hdmi_sound() -> Result<(), Error>{
+    Command::new("pactl")
+        .args(&[
+            "set-card-profile",
+            "0",
+            "output:analog-stereo+input:analog-stereo",
+        ])
+        .output()?;
+    Ok(())
+}
+
 /// The different kinds of errors that can happen.
 #[derive(Debug)]
 pub enum Error {
@@ -92,16 +116,16 @@ impl From<ParseIntError> for Error {
 #[derive(Debug)]
 pub struct Screen {
     /// The name of the screen received from xrandr.
-    name: String,
+    pub name: String,
 
     /// The available resolutions of the screen.
-    resolutions: Vec<(u32, u32)>,
+    pub resolutions: Vec<(u32, u32)>,
 
     /// Whether the screen is primary or not
-    primary: bool,
+    pub primary: bool,
 
     /// Whether the screen is connected or not.
-    connected: bool,
+    pub connected: bool,
 }
 
 impl Screen {
@@ -319,6 +343,15 @@ impl MultiScreen {
         Ok(())
     }
 
+    /// If a HDMI screen is detected, puts the sound on it. Otherwise, disables it.
+    pub fn enable_hdmi_sound_if_present(&self) -> Result<(), Error> {
+        let hdmi = self.screens.iter().fold(false, |acc, x| acc || x.name.to_lowercase().contains("hdmi"));
 
+        Ok(if hdmi {
+            enable_hdmi_sound()?
+        } else {
+            disable_hdmi_sound()?
+        })
+    }
 
 }

src/tv.rs

@@ -19,11 +19,16 @@ fn main() {
              .help("Specify the position of the second screen")
              .possible_values(&["left", "right", "above", "below"])
              .required_if("action", "enable"))
+        .arg(Arg::with_name("sound")
+             .help("Outputs the sound to the HDMI (requires pulseaudio)")
+             .short("s")
+             .long("sound"))
         .get_matches();
 
     let screens = MultiScreen::detect()
         .expect("An error happened while finding screens");
 
+    let sound = matches.occurrences_of("sound") > 0;
 
     let result = match matches.value_of("action") {
         Some("disable") => screens.only_primary(),
@@ -37,5 +42,11 @@ fn main() {
         _ => Ok(())
     };
 
+    if sound {
+        if let Err(e) = screens.enable_hdmi_sound_if_present() {
+            eprintln!("Error: couldn't set hdmi sound: {:?}", e);
+        }
+    }
+
     result.expect("An error happenned while executing the command");
 }