Add volume option to CLI args

src/cli.rs

@@ -18,6 +18,10 @@ pub struct CliArgs {
     /// In REPL mode, the prompt to display
     #[clap(long, default_value_t = String::from("|"))]
     pub prompt: String,
+
+    /// The volume at which to playback audio, out of 1.0
+    #[clap(long)]
+    pub volume: Option<f32>,
 }
 
 pub fn parse() -> CliArgs {

src/main.rs

@@ -58,6 +58,7 @@ fn main() {
         }
         // build playback controller
         let script_file2 = script_file.clone();
+        let volume = args.volume.clone();
         let player_builder = move || {
             let script_reader = io::BufReader::new(
                 std::fs::File::open(&script_file2)
@@ -65,7 +66,11 @@ fn main() {
             );
             let runner = MpsRunner::with_stream(script_reader);
 
-            MpsPlayer::new(runner).unwrap()
+            let player = MpsPlayer::new(runner).unwrap();
+            if let Some(vol) = volume {
+                player.set_volume(vol);
+            }
+            player
         };
         if let Some(playlist_file) = &args.playlist {
             // generate playlist

src/repl.rs

@@ -35,10 +35,15 @@ pub fn repl(args: CliArgs) {
     terminal.c_lflag &= !termios::ICANON; // no echo and canonical mode
     termios::tcsetattr(0, termios::TCSANOW, &mut terminal).unwrap();*/
     let (writer, reader) = channel_io();
+    let volume = args.volume.clone();
     let player_builder = move || {
         let runner = MpsRunner::with_stream(reader);
 
-        MpsPlayer::new(runner).unwrap()
+        let player = MpsPlayer::new(runner).unwrap();
+        if let Some(vol) = volume {
+            player.set_volume(vol);
+        }
+        player
     };
     let mut state = ReplState::new(writer);
     if let Some(playlist_file) = &args.playlist {