Always use Git instance from project

This removes the need to open a new repository
each time a directory-view or file-view is displayed
and also when a status-bar is displayed for a buffer.

src/app/buffer.coffee

@@ -8,7 +8,6 @@ UndoManager = require 'undo-manager'
 BufferChangeOperation = require 'buffer-change-operation'
 Anchor = require 'anchor'
 AnchorRange = require 'anchor-range'
-Git = require 'git'
 
 module.exports =
 class Buffer
@@ -24,7 +23,6 @@ class Buffer
   anchors: null
   anchorRanges: null
   refcount: 0
-  git: null
 
   constructor: (path, @project) ->
     @id = @constructor.idCounter++
@@ -90,8 +88,6 @@ class Buffer
   setPath: (path) ->
     return if path == @getPath()
 
-    @git = new Git(path)
-
     @file?.off()
     @file = new File(path)
     if @file.exists()
@@ -387,12 +383,12 @@ class Buffer
       line = @lineForRow(row)
       console.log row, line, line.length
 
-  getGit: -> @git
+  getRepo: -> @project?.repo
 
   checkoutHead: ->
     path = @getPath()
     return unless path
-    if @git?.checkoutHead(path)
+    if @getRepo()?.checkoutHead(path)
       @trigger 'git-status-changed'
 
   scheduleStoppedChangingEvent: ->

src/packages/status-bar/spec/status-bar-spec.coffee

@@ -119,6 +119,7 @@ describe "StatusBar", ->
       expect(statusBar.branchLabel.text()).toBe 'master'
 
     it "doesn't display the current branch for a file not in a repository", ->
+      rootView.project.setPath('/tmp')
       path = '/tmp/temp.txt'
       rootView.open(path)
       expect(statusBar.branchArea).toBeHidden()

src/packages/status-bar/src/status-bar.coffee

@@ -65,7 +65,7 @@ class StatusBar extends View
     @branchArea.hide()
     return unless path
 
-    head = @buffer.getGit()?.getShortHead()
+    head = @buffer.getRepo()?.getShortHead()
     @branchLabel.text(head)
     @branchArea.show() if head
 
@@ -75,9 +75,10 @@ class StatusBar extends View
     return unless path
 
     @gitStatusIcon.removeClass().addClass('git-status octicons')
-    if @buffer.getGit()?.isPathModified(path)
+    git = @buffer.getRepo()
+    if git?.isPathModified(path)
       @gitStatusIcon.addClass('modified-status-icon')
-      stats = @buffer.getGit().getDiffStats(path)
+      stats = git.getDiffStats(path)
       if stats.added and stats.deleted
         @gitStatusIcon.text("+#{stats.added},-#{stats.deleted}")
       else if stats.added
@@ -86,7 +87,7 @@ class StatusBar extends View
         @gitStatusIcon.text("-#{stats.deleted}")
       else
         @gitStatusIcon.text('')
-    else if @buffer.getGit()?.isPathNew(path)
+    else if git?.isPathNew(path)
       @gitStatusIcon.addClass('new-status-icon')
       @gitStatusIcon.text("+#{@buffer.getLineCount()}")
 

src/packages/tree-view/src/directory-view.coffee

@@ -22,7 +22,7 @@ class DirectoryView extends View
     @expand() if isExpanded
     @disclosureArrow.on 'click', => @toggleExpansion()
     repositoryPath = parent?.getPath() or @directory.getPath()
-    @directoryName.addClass('ignored') if new Git(repositoryPath).isPathIgnored(@directory.getPath())
+    @directoryName.addClass('ignored') if @project.repo.isPathIgnored(@directory.getPath())
 
   getPath: ->
     @directory.path
@@ -39,7 +39,7 @@ class DirectoryView extends View
       if entry instanceof Directory
         @entries.append(new DirectoryView(directory: entry, isExpanded: false, project: @project, parent: @directory))
       else
-        @entries.append(new FileView(entry))
+        @entries.append(new FileView(file: entry, project: @project))
     @append(@entries)
 
   toggleExpansion: ->

src/packages/tree-view/src/file-view.coffee

@@ -6,14 +6,14 @@ fs = require 'fs'
 module.exports =
 class FileView extends View
 
-  @content: (file) ->
+  @content: ({file} = {}) ->
     @li class: 'file entry', =>
       @span file.getBaseName(), class: 'name', outlet: 'fileName'
       @span "", class: 'highlight'
 
   file: null
 
-  initialize: (@file) ->
+  initialize: ({@file, project} = {}) ->
     path = @getPath()
     extension = fs.extension(path)
     if fs.isCompressedExtension(extension)
@@ -25,12 +25,11 @@ class FileView extends View
     else
       @fileName.addClass('text-name')
 
-    git = new Git(path)
-    if git.isPathIgnored(path)
+    if project.repo.isPathIgnored(path)
       @addClass('ignored')
-    else if git.isPathModified(path)
+    else if project.repo.isPathModified(path)
       @addClass('modified')
-    else if git.isPathNew(path)
+    else if project.repo.isPathNew(path)
       @addClass('new')
 
   getPath: ->