Add swap functionality

CHANGELOG.md

@@ -9,6 +9,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased] - ReleaseDate
 
+## [1.5.0] - unreleased
+- Add the `--swap` flag to swap the currently active window with the selected window.
+
 ## [1.4.0] - 2023-01-22
 - Modernize all dependencies
 - Fix border offset issue resulting from newer versions of i3

src/args.rs

@@ -222,6 +222,10 @@ pub struct AppConfig {
     /// List of keys to exit application, sequences separator is space, key separator is '+', eg Control_L+g Shift_L+f
     #[arg(short, long, value_parser(parse_exit_keys))]
     pub exit_keys: Vec<utils::Sequence>,
+
+    /// If this flag is set, the currently active window will swap with the selected window.
+    #[arg(short, long)]
+    pub swap: bool,
 }
 
 pub fn parse_args() -> AppConfig {

src/main.rs

@@ -297,7 +297,20 @@ fn main() -> Result<()> {
                         if app_config.print_only {
                             println!("0x{:x}", rw.desktop_window.x_window_id.unwrap_or(0));
                         } else {
-                            wm::focus_window(rw.desktop_window).context("Couldn't focus window")?;
+                            if app_config.swap {
+                                let Some(active_window) =
+                                    desktop_windows.iter().find(|window| window.is_focused)
+                                else {
+                                    warn!("There's on active window.");
+                                    closed = true;
+                                    continue;
+                                };
+                                wm::swap_windows(active_window, rw.desktop_window)
+                                    .context("Couldn't swap windows")?;
+                            } else {
+                                wm::focus_window(rw.desktop_window)
+                                    .context("Couldn't focus window")?;
+                            }
                         }
                         closed = true;
                     } else if !pressed_keys.is_empty()

src/wm_i3.rs

@@ -121,3 +121,17 @@ pub fn focus_window(window: &DesktopWindow) -> Result<()> {
     info!("Sending to i3: {:?}", command);
     Ok(())
 }
+
+/// Focus a specific `window`.
+pub fn swap_windows(active_window: &DesktopWindow, window: &DesktopWindow) -> Result<()> {
+    let mut connection = I3Connection::connect().context("Couldn't acquire i3 connection")?;
+    let command_str = format!(
+        "[con_id=\"{}\"] swap with container con_id {}",
+        active_window.id, window.id
+    );
+    let command = connection
+        .run_command(&command_str)
+        .context("Couldn't communicate with i3")?;
+    info!("Sending to i3: {:?}", command);
+    Ok(())
+}