Pass matching file list to the hook in gclient.

Review URL: http://codereview.chromium.org/160294

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@22224 0039d316-1c4b-4281-b951-d872f2087c98

gclient.py

@@ -55,7 +55,9 @@ Hooks
                The action is executed in the same directory as the .gclient
                file.  If the first item in the list is the string "python",
                the current Python interpreter (sys.executable) will be used
-               to run the command.
+               to run the command. If the list contains string "$matching_files"
+               it will be removed from the list and the list will be extended
+               by the list of matching files.
 
   Example:
     hooks = [
@@ -1220,7 +1222,7 @@ class GClient(object):
         deps[d] = url
     return deps
 
-  def _RunHookAction(self, hook_dict):
+  def _RunHookAction(self, hook_dict, matching_file_list):
     """Runs the action from a single hook.
     """
     command = hook_dict['action'][:]
@@ -1230,6 +1232,10 @@ class GClient(object):
       # interpreter.
       command[0] = sys.executable
 
+    if '$matching_files' in command:
+      command.remove('$matching_files')
+      command.extend(matching_file_list)
+
     # Use a discrete exit status code of 2 to indicate that a hook action
     # failed.  Users of this script may wish to treat hook action failures
     # differently from VC failures.
@@ -1256,22 +1262,16 @@ class GClient(object):
     # changed so we always run all hooks.
     if self._options.force or is_using_git:
       for hook_dict in hooks:
-        self._RunHookAction(hook_dict)
+        self._RunHookAction(hook_dict, [])
       return
 
     # Run hooks on the basis of whether the files from the gclient operation
     # match each hook's pattern.
     for hook_dict in hooks:
       pattern = re.compile(hook_dict['pattern'])
-      for file in file_list:
-        if not pattern.search(file):
-          continue
-
-        self._RunHookAction(hook_dict)
-
-        # The hook's action only runs once.  Don't bother looking for any
-        # more matches.
-        break
+      matching_file_list = [file for file in file_list if pattern.search(file)]
+      if matching_file_list:
+        self._RunHookAction(hook_dict, matching_file_list)
 
   def RunOnDeps(self, command, args):
     """Runs a command on each dependency in a client and its dependencies.