Store Git instance in Buffer

Access it from StatusBar for checking
path status and current branch.

src/app/buffer.coffee

@@ -22,6 +22,7 @@ class Buffer
   anchors: null
   anchorRanges: null
   refcount: 0
+  git: null
 
   constructor: (path, @project) ->
     @id = @constructor.idCounter++
@@ -85,6 +86,8 @@ class Buffer
   setPath: (path) ->
     return if path == @getPath()
 
+    @git = new Git(path)
+
     @file?.off()
     @file = new File(path)
     @subscribeToFile()
@@ -367,10 +370,12 @@ class Buffer
       line = @lineForRow(row)
       console.log row, line, line.length
 
+  getGit: -> @git
+
   checkoutHead: ->
     path = @getPath()
     return unless path
-    if new Git(path).checkoutHead(path)
+    if @git?.checkoutHead(path)
       @trigger 'git-status-change'
 
 _.extend(Buffer.prototype, EventEmitter)

src/app/status-bar.coffee

@@ -1,6 +1,5 @@
 _ = require 'underscore'
 {View, $$} = require 'space-pen'
-Git = require 'git'
 
 module.exports =
 class StatusBar extends View
@@ -29,8 +28,6 @@ class StatusBar extends View
           @span class: 'branch-label', outlet: 'branchLabel'
         @span outlet: 'cursorPosition'
 
-  git: null
-
   initialize: (@rootView, @editor) ->
     @updatePathText()
     @editor.on 'editor-path-change', =>
@@ -45,8 +42,6 @@ class StatusBar extends View
   subscribeToBuffer: ->
     @buffer?.off '.status-bar'
     @buffer = @editor.getBuffer()
-    if path = @editor.getPath()
-      @git = new Git(path)
     @buffer.on 'change.status-bar', => _.delay (=> @updateBufferModifiedText()), 50
     @buffer.on 'after-save.status-bar', => _.delay (=> @updateStatusBar()), 50
     @buffer.on 'git-status-change.status-bar', => _.delay (=> @updateStatusBar()), 50
@@ -70,7 +65,7 @@ class StatusBar extends View
     @branchArea.hide()
     return unless path
 
-    head = @git.getShortHead()
+    head = @buffer.getGit()?.getShortHead()
     @branchLabel.text(head)
     @branchArea.show() if head
 
@@ -79,9 +74,9 @@ class StatusBar extends View
     @gitStatusIcon.empty()
     return unless path
 
-    if @git.isPathModified(path)
+    if @buffer.getGit()?.isPathModified(path)
       @gitStatusIcon.append $$ -> @span '\uf26d', class: 'modified-status-icon'
-    else if @git.isPathNew(path)
+    else if  @buffer.getGit()?.isPathNew(path)
       @gitStatusIcon.append $$ -> @span '\uf26b', class: 'new-status-icon'
 
   updatePathText: ->