term: notify embedding application when palette changes

refs: #748

term/src/terminal.rs

@@ -51,6 +51,8 @@ pub enum Alert {
     /// When the title, or something that likely influences the title,
     /// has been changed
     TitleMaybeChanged,
+    /// When the color palette has been updated
+    PaletteChanged,
 }
 
 pub trait AlertHandler {

term/src/terminalstate.rs

@@ -3268,6 +3268,9 @@ impl<'a> Performer<'a> {
                 self.screen.activate_primary_screen();
                 self.erase_in_display(EraseInDisplay::EraseScrollback);
                 self.erase_in_display(EraseInDisplay::EraseDisplay);
+                if let Some(handler) = self.alert_handler.as_mut() {
+                    handler.alert(Alert::PaletteChanged);
+                }
             }
 
             _ => log::warn!("ESC: unhandled {:?}", esc),
@@ -3435,6 +3438,9 @@ impl<'a> Performer<'a> {
                         }
                     }
                 }
+                if let Some(handler) = self.alert_handler.as_mut() {
+                    handler.alert(Alert::PaletteChanged);
+                }
                 self.make_all_lines_dirty();
             }
 
@@ -3455,6 +3461,9 @@ impl<'a> Performer<'a> {
                         }
                     }
                 }
+                if let Some(handler) = self.alert_handler.as_mut() {
+                    handler.alert(Alert::PaletteChanged);
+                }
             }
 
             OperatingSystemCommand::ChangeDynamicColors(first_color, colors) => {
@@ -3508,6 +3517,9 @@ impl<'a> Performer<'a> {
                     }
                     idx += 1;
                 }
+                if let Some(handler) = self.alert_handler.as_mut() {
+                    handler.alert(Alert::PaletteChanged);
+                }
                 self.make_all_lines_dirty();
             }
 
@@ -3544,6 +3556,9 @@ impl<'a> Performer<'a> {
                         | DynamicColorNumber::TektronixCursorColor => {}
                     }
                 }
+                if let Some(handler) = self.alert_handler.as_mut() {
+                    handler.alert(Alert::PaletteChanged);
+                }
                 self.make_all_lines_dirty();
             }
         }

wezterm-gui/src/frontend.rs

@@ -65,6 +65,10 @@ impl GuiFrontEnd {
                         log::info!("Ding! (this is the bell)");
                     }
                     MuxNotification::Alert {
+                        pane_id: _,
+                        alert: Alert::PaletteChanged,
+                    }
+                    | MuxNotification::Alert {
                         pane_id: _,
                         alert: Alert::TitleMaybeChanged,
                     } => {}

wezterm-gui/src/termwindow/mod.rs

@@ -757,6 +757,12 @@ impl TermWindow {
                 } => {
                     self.update_title();
                 }
+                MuxNotification::Alert {
+                    alert: Alert::PaletteChanged,
+                    pane_id,
+                } => {
+                    self.mux_pane_output_event(pane_id);
+                }
                 MuxNotification::PaneOutput(pane_id) => {
                     self.mux_pane_output_event(pane_id);
                 }