Add niri msg windows

src/cli.rs

@@ -62,6 +62,8 @@ pub enum Msg {
     Outputs,
     /// List workspaces.
     Workspaces,
+    /// List open windows.
+    Windows,
     /// Get the configured keyboard layouts.
     KeyboardLayouts,
     /// Print information about the focused output.

src/ipc/client.rs

@@ -20,6 +20,7 @@ pub fn handle_msg(msg: Msg, json: bool) -> anyhow::Result<()> {
             action: action.clone(),
         },
         Msg::Workspaces => Request::Workspaces,
+        Msg::Windows => Request::Windows,
         Msg::KeyboardLayouts => Request::KeyboardLayouts,
         Msg::EventStream => Request::EventStream,
         Msg::RequestError => Request::ReturnError,
@@ -155,6 +156,45 @@ pub fn handle_msg(msg: Msg, json: bool) -> anyhow::Result<()> {
                 println!("No window is focused.");
             }
         }
+        Msg::Windows => {
+            let Response::Windows(mut windows) = response else {
+                bail!("unexpected response: expected Windows, got {response:?}");
+            };
+
+            if json {
+                let windows =
+                    serde_json::to_string(&windows).context("error formatting response")?;
+                println!("{windows}");
+                return Ok(());
+            }
+
+            windows.sort_unstable_by(|a, b| a.id.cmp(&b.id));
+
+            for window in windows {
+                let focused = if window.is_focused { " (focused)" } else { "" };
+                println!("Window ID {}:{focused}", window.id);
+
+                if let Some(title) = window.title {
+                    println!("  Title: \"{title}\"");
+                } else {
+                    println!("  Title: (unset)");
+                }
+
+                if let Some(app_id) = window.app_id {
+                    println!("  App ID: \"{app_id}\"");
+                } else {
+                    println!("  App ID: (unset)");
+                }
+
+                if let Some(workspace_id) = window.workspace_id {
+                    println!("  Workspace ID: {workspace_id}");
+                } else {
+                    println!("  Workspace ID: (none)");
+                }
+
+                println!();
+            }
+        }
         Msg::FocusedOutput => {
             let Response::FocusedOutput(output) = response else {
                 bail!("unexpected response: expected FocusedOutput, got {response:?}");

src/ipc/server.rs

@@ -260,6 +260,11 @@ async fn process(ctx: &ClientCtx, request: Request) -> Reply {
             let workspaces = state.workspaces.workspaces.values().cloned().collect();
             Response::Workspaces(workspaces)
         }
+        Request::Windows => {
+            let state = ctx.event_stream_state.borrow();
+            let windows = state.windows.windows.values().cloned().collect();
+            Response::Windows(windows)
+        }
         Request::KeyboardLayouts => {
             let state = ctx.event_stream_state.borrow();
             let layout = state.keyboard_layouts.keyboard_layouts.clone();