Move editor key handling to one place

src/ui/util.rs

@@ -1,8 +1,12 @@
 use std::sync::Arc;
 
+use crossterm::event::KeyCode;
 use parking_lot::FairMutex;
 use toss::terminal::Terminal;
 
+use super::input::{key, KeyBindingsList, KeyEvent};
+use super::widgets::editor::EditorState;
+
 pub fn prompt(
     terminal: &mut Terminal,
     crossterm_lock: &Arc<FairMutex<()>>,
@@ -25,3 +29,58 @@ pub fn prompt(
         Some(content)
     }
 }
+
+// TODO Support more of the emacs-y bindings, see bash as example
+
+pub fn list_editor_key_bindings(
+    bindings: &mut KeyBindingsList,
+    char_filter: impl Fn(char) -> bool,
+    can_edit_externally: bool,
+) {
+    if char_filter('\n') {
+        bindings.binding("enter+<any modifier>", "insert newline");
+    }
+    bindings.binding("backspace", "delete before cursor");
+    bindings.binding("delete", "delete after cursor");
+    bindings.binding("ctrl+l", "clear editor contents");
+    if can_edit_externally {
+        bindings.binding("ctrl+e", "edit in $EDITOR");
+    }
+    bindings.binding("arrow keys", "move cursor");
+}
+
+pub fn handle_editor_key_event(
+    editor: &EditorState,
+    terminal: &mut Terminal,
+    crossterm_lock: &Arc<FairMutex<()>>,
+    event: KeyEvent,
+    char_filter: impl Fn(char) -> bool,
+    can_edit_externally: bool,
+) -> bool {
+    match event {
+        // Enter with *any* modifier pressed - if ctrl and shift don't
+        // work, maybe alt does
+        key!(Enter) => return false,
+        KeyEvent {
+            code: KeyCode::Enter,
+            ..
+        } if char_filter('\n') => editor.insert_char(terminal.frame(), '\n'),
+
+        // Editing
+        key!(Char ch) if char_filter(ch) => editor.insert_char(terminal.frame(), ch),
+        key!(Backspace) => editor.backspace(terminal.frame()),
+        key!(Delete) => editor.delete(),
+        key!(Ctrl + 'l') => editor.clear(),
+        key!(Ctrl + 'e') if can_edit_externally => editor.edit_externally(terminal, crossterm_lock),
+
+        // Cursor movement
+        key!(Left) => editor.move_cursor_left(terminal.frame()),
+        key!(Right) => editor.move_cursor_right(terminal.frame()),
+        key!(Up) => editor.move_cursor_up(terminal.frame()),
+        key!(Down) => editor.move_cursor_down(terminal.frame()),
+
+        _ => return false,
+    }
+
+    true
+}