Feature/add git commit functionality (#2441)

As part of fleshing out the VCS this pr adds the ability to commit a file using the git sidebar.

Additions:
* Menu command toggle vcs visibility
* Recent Commits Section: commits made whilst in oni (later might be preferable to get a git log rather than commits from oni)

* Commiting: see below

![vcs_commit](https://user-images.githubusercontent.com/22454918/43024011-bd3e27ac-8c64-11e8-8d2e-944047d7ed8d.gif)

Author: akinsho

browser/src/Input/KeyBindings.ts

@@ -28,12 +28,15 @@ export const applyDefaultKeyBindings = (oni: Oni.Plugin.Api, config: Configurati
         editors.activeEditor.mode === "insert" || editors.activeEditor.mode === "cmdline_normal"
 
     const oniWithSidebar = oni as Oni.Plugin.Api & ISidebar
-    const isExplorerActive = () =>
-        oniWithSidebar.sidebar.activeEntryId === "oni.sidebar.explorer" &&
+    const isSidebarPaneOpen = (paneId: string) =>
+        oniWithSidebar.sidebar.activeEntryId === paneId &&
         oniWithSidebar.sidebar.isFocused &&
         !isInsertOrCommandMode() &&
         !isMenuOpen()
 
+    const isExplorerActive = () => isSidebarPaneOpen("oni.sidebar.explorer")
+    const isVCSActive = () => isSidebarPaneOpen("oni.sidebar.vcs")
+
     const isMenuOpen = () => menu.isMenuOpen()
 
     if (Platform.isMac()) {
@@ -159,4 +162,9 @@ export const applyDefaultKeyBindings = (oni: Oni.Plugin.Api, config: Configurati
     input.bind("j", "browser.scrollDown")
     input.bind("h", "browser.scrollLeft")
     input.bind("l", "browser.scrollRight")
+
+    // VCS
+    input.bind("e", "vcs.openFile", isVCSActive)
+    input.bind("<c-r>", "vcs.refresh", isVCSActive)
+    input.bind("?", "vcs.showHelp", isVCSActive)
 }

browser/src/Services/Sidebar/SidebarStore.ts

@@ -62,6 +62,10 @@ export class SidebarManager {
         return this._contentSplit.isFocused
     }
 
+    get isVisible(): boolean {
+        return this._contentSplit.isVisible
+    }
+
     public get store(): Store<ISidebarState> {
         return this._store
     }

browser/src/Services/VersionControl/VersionControlManager.tsx

@@ -6,7 +6,7 @@ import * as React from "react"
 
 import { store, SupportedProviders, VersionControlPane, VersionControlProvider } from "./"
 import { Notifications } from "./../../Services/Notifications"
-import { Branch } from "./../../UI/components/VersionControl"
+import { Branch } from "./../../UI/components/VersionControl/Branch"
 import { MenuManager } from "./../Menu"
 import { SidebarManager } from "./../Sidebar"
 import { IWorkspace } from "./../Workspace"
@@ -15,6 +15,7 @@ interface ISendNotificationsArgs {
     detail: string
     level: "info" | "warn"
     title: string
+    expiration?: number
 }
 
 export type ISendVCSNotification = (args: ISendNotificationsArgs) => void
@@ -62,11 +63,11 @@ export class VersionControlManager {
     }
 
     // Use arrow function to maintain this binding of sendNotification
-    public sendNotification: ISendVCSNotification = ({ detail, level, title }) => {
+    public sendNotification: ISendVCSNotification = ({ expiration = 3_000, ...args }) => {
         const notification = this._notifications.createItem()
-        notification.setContents(title, detail)
-        notification.setExpiration(3_000)
-        notification.setLevel(level)
+        notification.setContents(args.title, args.detail)
+        notification.setExpiration(expiration)
+        notification.setLevel(args.level)
         notification.show()
     }
 
@@ -140,6 +141,8 @@ export class VersionControlManager {
                     this._workspace,
                     this._vcsProvider,
                     this.sendNotification,
+                    this._commands,
+                    this._sidebar,
                     store,
                 )
                 this._sidebar.add("code-fork", vcsPane)
@@ -170,15 +173,27 @@ export class VersionControlManager {
     }
 
     private _registerCommands = () => {
+        const toggleVCS = () => {
+            this._sidebar.toggleVisibilityById("oni.sidebar.vcs")
+        }
+
+        this._commands.registerCommand({
+            command: "vcs.sidebar.toggle",
+            name: "Version Control: Toggle Visibility",
+            detail: "Toggles the vcs pane in the sidebar",
+            execute: toggleVCS,
+            enabled: () => this._configuration.getValue("experimental.vcs.sidebar"),
+        })
+
         this._commands.registerCommand({
-            command: `oni.${this._vcs}.fetch`,
+            command: `vcs.fetch`,
             name: "Fetch the selected branch",
             detail: "",
             execute: this._fetchBranch,
         })
 
         this._commands.registerCommand({
-            command: `oni.${this._vcs}.branches`,
+            command: `vcs.branches`,
             name: `Local ${capitalize(this._vcs)} Branches`,
             detail: "Open a menu with a list of all local branches",
             execute: this._createBranchList,
@@ -194,6 +209,7 @@ export class VersionControlManager {
         }
 
         try {
+            // FIXME: there is race condition on deactivation of the provider
             const branch = await this._vcsProvider.getBranch()
             const diff = await this._vcsProvider.getDiff()