init commit

src/player.rs

@@ -0,0 +1,51 @@
+use crate::config::Config;
+use anyhow::{anyhow, Result, Context};
+use mpris::{Player, PlayerFinder, PlaybackStatus};
+use std::thread;
+use std::time::Duration;
+
+const INTERVAL: Duration = Duration::from_millis(1000);
+
+const MPRIS_BUS_PREFIX: &str = "org.mpris.MediaPlayer2.";
+
+pub fn is_active(player: &Player) -> bool {
+    if !player.is_running() { return false; }
+
+    matches!(player.get_playback_status(), Ok(PlaybackStatus::Playing))
+}
+
+pub fn is_whitelisted(config: &Config, player: &Player) -> bool {
+    if Some(player.bus_name()) == config.player_bus.as_deref() {
+        return true
+    } else if config.player_bus.is_none() {
+        return player.bus_name().starts_with(MPRIS_BUS_PREFIX)
+    } else {
+        return false
+    }
+}
+
+pub fn wait_for_player(config: &Config) -> Result<Player> {
+    let finder = PlayerFinder::new()
+        .map_err(|err| anyhow!("{}", err))
+        .context("failed to connect to d-bus")?;
+
+    loop {
+        let players = match finder.iter_players() {
+            Ok(players) => players,
+            _ => {
+                thread::sleep(INTERVAL);
+                continue;
+            }
+        };
+
+        for player in players {
+            if let Ok(player) = player {
+                if is_active(&player) && is_whitelisted(config, &player) {
+                    return Ok(player);
+                }
+            }
+        }
+
+        thread::sleep(INTERVAL);
+    }
+}