Bug 1565358: Use Parameters.file_url helper consitently; r=mhentges

Only one place should need to know how to generate VCS URLs. This
makes it easier to support other VCSs.

Differential Revision: https://phabricator.services.mozilla.com/D37772

taskcluster/taskgraph/parameters.py

@@ -195,14 +195,14 @@ class Parameters(ReadOnlyDict):
         """
         return 'try' in self['project'] or self['try_mode'] == 'try_select'
 
-    def file_url(self, path, endpoint="file"):
+    def file_url(self, path, pretty=False):
         """
         Determine the VCS URL for viewing a file in the tree, suitable for
         viewing by a human.
 
         :param basestring path: The path, relative to the root of the repository.
-        :param basestring endpoint: The endpoint. Defaults to "file"
-
+        :param bool pretty: Whether to return a link to a formatted version of the
+            file, or the raw file version.
         :return basestring: The URL displaying the given path.
         """
         if path.startswith('comm/'):
@@ -213,6 +213,7 @@ class Parameters(ReadOnlyDict):
             repo = self['head_repository']
             rev = self['head_rev']
 
+        endpoint = 'file' if pretty else 'raw-file'
         return '{}/{}/{}/{}'.format(repo, endpoint, rev, path)
 
     def release_level(self):