Add specific key bindings to stage / unstage items

Feature requested by Issue gitui-org#909.

Author: alessandroasm

src/components/changes.rs

@@ -233,7 +233,12 @@ impl Component for ChangesComponent {
 
 		if self.focused() {
 			if let Event::Key(e) = ev {
-				return if e == self.key_config.enter {
+				let stage_or_reset_key = if self.is_working_dir {
+					self.key_config.stage_item
+				} else {
+					self.key_config.unstage_item
+				};
+				return if e == stage_or_reset_key {
 					try_or_popup!(
 						self,
 						"staging error:",

src/keys.rs

@@ -88,6 +88,8 @@ pub struct KeyConfig {
 	pub pull: KeyEvent,
 	pub abort_merge: KeyEvent,
 	pub undo_commit: KeyEvent,
+	pub stage_item: KeyEvent,
+	pub unstage_item: KeyEvent,
 }
 
 #[rustfmt::skip]
@@ -161,6 +163,8 @@ impl Default for KeyConfig {
 			abort_merge: KeyEvent { code: KeyCode::Char('A'), modifiers: KeyModifiers::SHIFT},
 			open_file_tree: KeyEvent { code: KeyCode::Char('F'), modifiers: KeyModifiers::SHIFT},
 			file_find: KeyEvent { code: KeyCode::Char('f'), modifiers: KeyModifiers::empty()},
+			stage_item: KeyEvent { code: KeyCode::Enter, modifiers: KeyModifiers::empty()},
+			unstage_item: KeyEvent { code: KeyCode::Enter, modifiers: KeyModifiers::empty()},
 		}
 	}
 }