Don't attach when being used as a Git editor

Don't show the tree view by default when the project path ends in .git
and a file path is being opened.  This will be the case when editing a
commit message or interactive rebase.

Author: kevinsawicki

.gitignore

@@ -0,0 +1 @@
+node_modules

lib/tree.coffee

@@ -1,8 +1,10 @@
+path = require 'path'
+
 module.exports =
   treeView: null
 
   activate: (@state) ->
-    @state.attached ?= true unless rootView.getActivePaneItem()
+    @state.attached ?= true if @shouldAttach()
 
     @createView() if @state.attached
     rootView.command 'tree-view:toggle', => @createView().toggle()
@@ -23,3 +25,14 @@ module.exports =
       TreeView = require './tree-view'
       @treeView = new TreeView(@state)
     @treeView
+
+  shouldAttach: ->
+    if rootView.getActivePaneItem()
+      false
+    else if path.basename(project.getPath()) is '.git'
+      # Only attach when the project path matches the path to open signifying
+      # the .git folder was opened explicitly and not by using Atom as the Git
+      # editor.
+      project.getPath() is atom.getLoadSettings().pathToOpen
+    else
+      true

package.json

@@ -15,5 +15,8 @@
   },
   "publishConfig": {
     "registry": "https://atom.cloudant.com/registry/_design/app/_rewrite"
+  },
+  "dependencies": {
+    "temp": "~0.6.0"
   }
 }

spec/tree-view-spec.coffee

@@ -1,6 +1,7 @@
 {_, $, $$, fs, RootView} = require 'atom'
 TreeView = require '../lib/tree-view'
 path = require 'path'
+temp = require 'temp'
 
 describe "TreeView", ->
   [treeView, sampleJs, sampleTxt] = []
@@ -81,6 +82,16 @@ describe "TreeView", ->
         expect(treeView.hasParent()).toBeTruthy()
         expect(treeView.root).toExist()
 
+    describe "when the project is a .git folder", ->
+      it "does not create the tree view", ->
+        dotGit = path.join(temp.mkdirSync('repo'), '.git')
+        fs.makeTree(dotGit)
+        project.setPath(dotGit)
+        atom.deactivatePackage("tree-view")
+        atom.packageStates = {}
+        {treeView} = atom.activatePackage("tree-view").mainModule
+        expect(treeView).toBeFalsy()
+
   describe "serialization", ->
     it "restores expanded directories and selected file when deserialized", ->
       treeView.root.find('.directory:contains(dir1)').view().click()