Refactors the quickpick menus

Consolidated lots of duplicate functionality
go back navigation should be robust now

src/commands/quickPickItems.ts

@@ -1,13 +1,22 @@
 'use strict';
-import { QuickPickItem, Uri } from 'vscode';
+import { commands, QuickPickItem, Uri } from 'vscode';
 import { Commands } from '../constants';
 import { GitCommit, GitUri } from '../gitProvider';
 import * as moment from 'moment';
 import * as path from 'path';
 
-export interface CommandQuickPickItem extends QuickPickItem {
-    command: Commands;
-    args?: any[];
+export class CommandQuickPickItem implements QuickPickItem {
+    label: string;
+    description: string;
+    detail: string;
+
+    constructor(item: QuickPickItem, public command: Commands, public args?: any[]) {
+        Object.assign(this, item);
+    }
+
+    execute() {
+        return commands.executeCommand(this.command, ...(this.args || []));
+    }
 }
 
 export class CommitQuickPickItem implements QuickPickItem {
@@ -28,25 +37,14 @@ export class FileQuickPickItem implements QuickPickItem {
     label: string;
     description: string;
     detail: string;
+
     sha: string;
     uri: GitUri;
 
     constructor(commit: GitCommit, public fileName: string) {
         this.label = fileName;
+
         this.sha = commit.sha;
         this.uri = GitUri.fromUri(Uri.file(path.resolve(commit.repoPath, fileName)));
     }
-}
-
-export class ShowAllCommitsQuickPickItem implements QuickPickItem {
-
-    label: string;
-    description: string;
-    detail: string;
-
-    constructor(maxItems: number) {
-        this.label = `$(sync) Show Full History`;
-        this.description = `\u2014 Currently only showing the first ${maxItems} commits`;
-        this.detail = `This may take a while`;
-    }
 }