copy mode: add CopyMode key assignment actions

Defines an assignment action for each of the pre-defined actions
in copy mode.

refs: https://github.com/wez/wezterm/issues/993

config/src/keyassignment.rs

@@ -365,9 +365,35 @@ pub enum KeyAssignment {
     ClearKeyTableStack,
     DetachDomain(SpawnTabDomain),
     AttachDomain(String),
+
+    CopyMode(CopyModeAssignment),
 }
 impl_lua_conversion!(KeyAssignment);
 
+#[derive(Debug, Clone, Deserialize, Serialize, PartialEq, Eq)]
+pub enum CopyModeAssignment {
+    MoveToViewportBottom,
+    MoveToViewportTop,
+    MoveToViewportMiddle,
+    MoveToScrollbackTop,
+    MoveToScrollbackBottom,
+    ToggleSelectionByCell,
+    MoveToStartOfLineContent,
+    MoveToEndOfLineContent,
+    MoveToStartOfLine,
+    MoveToStartOfNextLine,
+    MoveBackwardWord,
+    MoveForwardWord,
+    MoveRight,
+    MoveLeft,
+    MoveUp,
+    MoveDown,
+    PageUp,
+    PageDown,
+    Close,
+}
+impl_lua_conversion!(CopyModeAssignment);
+
 pub type KeyTable = HashMap<(KeyCode, Modifiers), KeyTableEntry>;
 
 #[derive(Debug, Clone, Default)]

wezterm-gui/src/overlay/copy.rs

@@ -1,6 +1,6 @@
 use crate::selection::{SelectionCoordinate, SelectionRange};
 use crate::termwindow::{TermWindow, TermWindowNotif};
-use config::keyassignment::ScrollbackEraseMode;
+use config::keyassignment::{CopyModeAssignment, KeyAssignment, ScrollbackEraseMode};
 use mux::domain::DomainId;
 use mux::pane::{Pane, PaneId};
 use mux::renderable::*;
@@ -404,6 +404,38 @@ impl Pane for CopyOverlay {
         Ok(())
     }
 
+    fn perform_assignment(&self, assignment: &KeyAssignment) -> bool {
+        use CopyModeAssignment::*;
+        match assignment {
+            KeyAssignment::CopyMode(assignment) => {
+                let mut render = self.render.borrow_mut();
+                match assignment {
+                    MoveToViewportBottom => render.move_to_viewport_bottom(),
+                    MoveToViewportTop => render.move_to_viewport_top(),
+                    MoveToViewportMiddle => render.move_to_viewport_middle(),
+                    MoveToScrollbackTop => render.move_to_top(),
+                    MoveToScrollbackBottom => render.move_to_bottom(),
+                    ToggleSelectionByCell => render.toggle_selection_by_cell(),
+                    MoveToStartOfLineContent => render.move_to_start_of_line_content(),
+                    MoveToEndOfLineContent => render.move_to_end_of_line_content(),
+                    MoveToStartOfLine => render.move_to_start_of_line(),
+                    MoveToStartOfNextLine => render.move_to_start_of_next_line(),
+                    MoveBackwardWord => render.move_backward_one_word(),
+                    MoveForwardWord => render.move_forward_one_word(),
+                    MoveRight => render.move_right_single_cell(),
+                    MoveLeft => render.move_left_single_cell(),
+                    MoveUp => render.move_up_single_row(),
+                    MoveDown => render.move_down_single_row(),
+                    PageUp => render.page_up(),
+                    PageDown => render.page_down(),
+                    Close => render.close(),
+                }
+                true
+            }
+            _ => false,
+        }
+    }
+
     fn key_down(&self, key: KeyCode, mods: KeyModifiers) -> anyhow::Result<()> {
         match (key, mods) {
             (KeyCode::Char('c'), KeyModifiers::CTRL)

wezterm-gui/src/termwindow/mod.rs

@@ -2404,6 +2404,9 @@ impl TermWindow {
                 })
                 .detach();
             }
+            CopyMode(_) => {
+                // NOP here; handled by the overlay directly
+            }
         };
         Ok(())
     }