Support grammar fileTypes that contains more than extensions

The Git bundle registers fileTypes with multiple path segments
such as '.git/config'

spec/app/text-mate-bundle-spec.coffee

@@ -36,6 +36,9 @@ describe "TextMateBundle", ->
       filePath = require.resolve("fixtures/shebang")
       expect(TextMateBundle.grammarForFilePath(filePath).name).toBe "Ruby"
 
+    it "uses the grammar's fileType as a suffix of the full filePath if the grammar cannot be determined by shebang line", ->
+      expect(TextMateBundle.grammarForFilePath("/tmp/.git/config").name).toBe "Git Config"
+
     it "uses plain text if no grammar can be found", ->
       filePath = require.resolve("this-is-not-a-real-file")
       expect(TextMateBundle.grammarForFilePath(filePath).name).toBe "Plain Text"

src/app/text-mate-bundle.coffee

@@ -36,11 +36,17 @@ class TextMateBundle
         @grammarsByScopeName[grammar.scopeName] = grammar
 
   @grammarForFilePath: (filePath) ->
+    return @grammarsByFileType["txt"] unless filePath
+
     extension = fs.extension(filePath)?[1...]
     if filePath and extension.length == 0
       extension = fs.base(filePath)
 
-    @grammarsByFileType[extension] or @grammarByShebang(filePath) or @grammarsByFileType["txt"]
+    @grammarsByFileType[extension] or @grammarByShebang(filePath) or @grammarByFileTypeSuffix(filePath) or @grammarsByFileType["txt"]
+
+  @grammarByFileTypeSuffix: (filePath) ->
+    for fileType, grammar of @grammarsByFileType
+      return grammar if _.endsWith(filePath, fileType)
 
   @grammarByShebang: (filePath) ->
     try

src/stdlib/underscore-extensions.coffee

@@ -82,3 +82,6 @@ _.mixin
 
     @pendingNextTickFns.push(fn)
     @messageChannel.port2.postMessage(0)
+
+  endsWith: (string, suffix) ->
+    string.indexOf(suffix, string.length - suffix.length) isnt -1