feat: Add persistent configuration and enumerate PipeWire audio devices

src/audio/pw_cli.rs

@@ -0,0 +1,65 @@
+use std::process::Command;
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct AudioDevice {
+    pub name: String,
+    pub description: String,
+    pub is_input: bool,
+}
+
+impl std::fmt::Display for AudioDevice {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.description)
+    }
+}
+
+pub fn enumerate_audio_devices() -> Vec<AudioDevice> {
+    let mut devices = Vec::new();
+    let output = Command::new("pw-cli")
+        .arg("list-objects")
+        .arg("Node")
+        .output();
+        
+    if let Ok(out) = output {
+        let text = String::from_utf8_lossy(&out.stdout);
+        let mut current_name = String::new();
+        let mut current_desc = String::new();
+        let mut current_class = String::new();
+
+        for line in text.lines() {
+            let line = line.trim();
+            if line.starts_with("id ") {
+                // Save previous if valid
+                if !current_name.is_empty() && current_class.starts_with("Audio/") {
+                    devices.push(AudioDevice {
+                        name: current_name.clone(),
+                        description: if current_desc.is_empty() { current_name.clone() } else { current_desc.clone() },
+                        is_input: current_class == "Audio/Source",
+                    });
+                }
+                current_name.clear();
+                current_desc.clear();
+                current_class.clear();
+            } else if let Some(val) = line.strip_prefix("node.name = \"") {
+                current_name = val.trim_end_matches('"').to_string();
+            } else if let Some(val) = line.strip_prefix("node.description = \"") {
+                current_desc = val.trim_end_matches('"').to_string();
+            } else if let Some(val) = line.strip_prefix("media.class = \"") {
+                current_class = val.trim_end_matches('"').to_string();
+            }
+        }
+        
+        // Final one
+        if !current_name.is_empty() && current_class.starts_with("Audio/") {
+            devices.push(AudioDevice {
+                name: current_name.clone(),
+                description: if current_desc.is_empty() { current_name } else { current_desc },
+                is_input: current_class == "Audio/Source",
+            });
+        }
+    }
+    
+    // Sort devices for consistent display
+    devices.sort_by(|a, b| a.description.cmp(&b.description));
+    devices
+}