lua: add window:mux_window() and pane:mux_window() methods

These allow converting the gui versions of these objects
to the mux versions.

refs: https://github.com/wez/wezterm/issues/225

Cargo.lock

@@ -4761,6 +4761,7 @@ dependencies = [
  "metrics",
  "mlua",
  "mux",
+ "mux-lua",
  "open",
  "ordered-float",
  "portable-pty",

docs/config/lua/pane/mux_pane.md

@@ -0,0 +1,6 @@
+# pane:mux_pane()
+
+*Since: nightly builds only*
+
+Returns the [MuxPane](../MuxPane.md) representation of this pane.
+

docs/config/lua/window/mux_window.md

@@ -0,0 +1,5 @@
+# window:mux_window()
+
+*Since: nightly builds only*
+
+Returns the [MuxWindow](../MuxWindow.md) representation of this window.

lua-api-crates/mux/src/lib.rs

@@ -258,11 +258,11 @@ impl SpawnWindow {
 }
 
 #[derive(Clone, Copy, Debug)]
-struct MuxWindow(WindowId);
+pub struct MuxWindow(pub WindowId);
 #[derive(Clone, Copy, Debug)]
-struct MuxTab(TabId);
+pub struct MuxTab(pub TabId);
 #[derive(Clone, Copy, Debug)]
-struct MuxPane(PaneId);
+pub struct MuxPane(pub PaneId);
 
 impl MuxWindow {
     fn resolve<'a>(&self, mux: &'a Rc<Mux>) -> mlua::Result<Ref<'a, Window>> {

wezterm-gui/Cargo.toml

@@ -46,6 +46,7 @@ luahelper = { path = "../luahelper" }
 metrics = { version="0.17", features=["std"]}
 mlua = {version="0.8.0-beta.4", features=["send"]}
 mux = { path = "../mux" }
+mux-lua = { path = "../lua-api-crates/mux" }
 open = "3.0"
 ordered-float = "3.0"
 portable-pty = { path = "../pty", features = ["serde_support", "ssh"]}

wezterm-gui/src/scripting/guiwin.rs

@@ -32,6 +32,9 @@ impl GuiWin {
 impl UserData for GuiWin {
     fn add_methods<'lua, M: UserDataMethods<'lua, Self>>(methods: &mut M) {
         methods.add_method("window_id", |_, this, _: ()| Ok(this.mux_window_id));
+        methods.add_method("mux_window", |_, this, _: ()| {
+            Ok(mux_lua::MuxWindow(this.mux_window_id))
+        });
         methods.add_method(
             "toast_notification",
             |_, _, (title, message, url, timeout): (String, String, Option<String>, Option<u64>)| {

wezterm-gui/src/scripting/pane.rs

@@ -31,6 +31,9 @@ impl PaneObject {
 impl UserData for PaneObject {
     fn add_methods<'lua, M: UserDataMethods<'lua, Self>>(methods: &mut M) {
         methods.add_method("pane_id", |_, this, _: ()| Ok(this.pane()?.pane_id()));
+        methods.add_method("mux_pane", |_, this, _: ()| {
+            Ok(mux_lua::MuxPane(this.pane()?.pane_id()))
+        });
         methods.add_method("get_title", |_, this, _: ()| Ok(this.pane()?.get_title()));
         methods.add_method("get_current_working_dir", |_, this, _: ()| {
             Ok(this