Add 'a' key to select/deselect all lines in custom mode

src/app.rs

@@ -99,6 +99,16 @@ impl CustomState {
     pub fn focus_lines(&mut self) {
         self.focus = CustomFocus::Lines;
     }
+
+    pub fn toggle_all(&mut self) {
+        if self.lines.is_empty() {
+            return;
+        }
+        let all_selected = self.selected.iter().all(|s| *s);
+        for s in &mut self.selected {
+            *s = !all_selected;
+        }
+    }
 }
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]

src/events.rs

@@ -134,6 +134,11 @@ fn handle_custom_event(app: &mut App, key: event::KeyEvent) -> bool {
                 state.command.push(' ');
             }
         }
+        KeyCode::Char('a') => {
+            if state.focus == CustomFocus::Lines {
+                state.toggle_all();
+            }
+        }
         KeyCode::Backspace => {
             state.command.pop();
         }

src/ui.rs

@@ -109,7 +109,7 @@ fn draw_custom(f: &mut Frame, app: &App) {
         .wrap(Wrap { trim: true });
     f.render_widget(input, chunks[1]);
 
-    let help = "↑/↓: move | Tab: focus | Space: toggle / space | Enter: run | Esc: back";
+    let help = "↑/↓: move | Space: toggle | a: select all | Tab: focus | Enter: run | Esc: back";
     let text = match &app.message {
         Some(msg) => Text::from(msg.as_str()),
         None => Text::from(help),