Add ui.menu text style (#664)

* add menu text style

* add ui.menu.text ui.info ui.info.text to book

* change ui.menu.text to ui.menu

* fix book's ui.menu

book/src/themes.md

@@ -91,6 +91,9 @@ Possible keys:
 | `ui.help`                |                                     |
 | `ui.text`                |                                     |
 | `ui.text.focus`          |                                     |
+| `ui.info`                |                                     |
+| `ui.info.text`           |                                     |
+| `ui.menu`                |                                     |
 | `ui.menu.selected`       |                                     |
 | `ui.selection`           | For selections in the editing area  |
 | `ui.selection.primary`   |                                     |

helix-term/src/ui/menu.rs

@@ -259,8 +259,11 @@ impl<T: Item + 'static> Component for Menu<T> {
     // TODO: required size should re-trigger when we filter items so we can draw a smaller menu
 
     fn render(&mut self, area: Rect, surface: &mut Surface, cx: &mut Context) {
-        let style = cx.editor.theme.get("ui.text");
-        let selected = cx.editor.theme.get("ui.menu.selected");
+        let theme = &cx.editor.theme;
+        let style = theme
+            .try_get("ui.menu")
+            .unwrap_or_else(|| theme.get("ui.text"));
+        let selected = theme.get("ui.menu.selected");
 
         let scroll = self.scroll;