Add history context menu button in the file browser (jupyterlab#864)

src/commandsAndMenu.tsx

@@ -34,7 +34,8 @@ import {
   discardIcon,
   gitIcon,
   openIcon,
-  removeIcon
+  removeIcon,
+  historyIcon
 } from './style/icons';
 import {
   CommandIDs,
@@ -893,6 +894,17 @@ export function addCommands(
     }
   });
 
+  commands.addCommand(ContextCommandIDs.gitFileHistory, {
+    label: trans.__('History'),
+    caption: trans.__('View the history of this file'),
+    execute: args => {
+      // TODO: Implement
+      const { files } = args as any as CommandArguments.IGitContextAction;
+      console.log('History Clicked', files.length === 1);
+    },
+    icon: historyIcon.bindprops({ stylesheet: 'menuItem' })
+  });
+
   commands.addCommand(ContextCommandIDs.gitNoAction, {
     label: trans.__('No actions available'),
     isEnabled: () => false,
@@ -1071,6 +1083,14 @@ export function addFileBrowserContextMenu(
           )
       );
 
+      // if looking at a single file that is not untracked
+      if (
+        items.length === 1 &&
+        (allCommands.size === 0 || !statuses.has('untracked'))
+      ) {
+        allCommands.add(ContextCommandIDs.gitFileHistory);
+      }
+
       // if looking at a tracked file with no changes,
       // it has no status, nor any actions available
       // (although `git rm` would be a valid action)

src/style/icons.ts

@@ -17,6 +17,7 @@ import removeSvg from '../../style/icons/remove.svg';
 import rewindSvg from '../../style/icons/rewind.svg';
 import tagSvg from '../../style/icons/tag.svg';
 import trashSvg from '../../style/icons/trash.svg';
+import clockSvg from '../../style/icons/clock.svg';
 
 export const gitIcon = new LabIcon({ name: 'git', svgstr: gitSvg });
 export const addIcon = new LabIcon({
@@ -79,3 +80,7 @@ export const trashIcon = new LabIcon({
   name: 'git:trash',
   svgstr: trashSvg
 });
+export const historyIcon = new LabIcon({
+  name: 'git:history',
+  svgstr: clockSvg
+});

src/tokens.ts

@@ -958,6 +958,7 @@ export enum ContextCommandIDs {
   gitFileUnstage = 'git:context-unstage',
   gitFileStage = 'git:context-stage',
   gitFileTrack = 'git:context-track',
+  gitFileHistory = 'git:context-history',
   gitIgnore = 'git:context-ignore',
   gitIgnoreExtension = 'git:context-ignoreExtension',
   gitNoAction = 'git:no-action'