Initial import.

1 files changed, 169 insertions, 0 deletions

diff --git a/chromium/tools/git/mffr.py b/chromium/tools/git/mffr.py
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+++ b/chromium/tools/git/mffr.py
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+#!/usr/bin/env python
+# Copyright (c) 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Usage: mffr.py [-d] [-g *.h] [-g *.cc] REGEXP REPLACEMENT
+
+This tool performs a fast find-and-replace operation on files in
+the current git repository.
+
+The -d flag selects a default set of globs (C++ and Objective-C/C++
+source files). The -g flag adds a single glob to the list and may
+be used multiple times. If neither -d nor -g is specified, the tool
+searches all files (*.*).
+
+REGEXP uses full Python regexp syntax. REPLACEMENT can use
+back-references.
+"""
+
+import optparse
+import re
+import subprocess
+import sys
+
+
+# We need to use shell=True with subprocess on Windows so that it
+# finds 'git' from the path, but can lead to undesired behavior on
+# Linux.
+_USE_SHELL = (sys.platform == 'win32')
+
+
+def MultiFileFindReplace(original, replacement, file_globs):
+  """Implements fast multi-file find and replace.
+
+  Given an |original| string and a |replacement| string, find matching
+  files by running git grep on |original| in files matching any
+  pattern in |file_globs|.
+
+  Once files are found, |re.sub| is run to replace |original| with
+  |replacement|.  |replacement| may use capture group back-references.
+
+  Args:
+    original: '(#(include|import)\s*["<])chrome/browser/ui/browser.h([>"])'
+    replacement: '\1chrome/browser/ui/browser/browser.h\3'
+    file_globs: ['*.cc', '*.h', '*.m', '*.mm']
+
+  Returns the list of files modified.
+
+  Raises an exception on error.
+  """
+  # Posix extended regular expressions do not reliably support the "\s"
+  # shorthand.
+  posix_ere_original = re.sub(r"\\s", "[[:space:]]", original)
+  if sys.platform == 'win32':
+    posix_ere_original = posix_ere_original.replace('"', '""')
+  out, err = subprocess.Popen(
+      ['git', 'grep', '-E', '--name-only', posix_ere_original,
+       '--'] + file_globs,
+      stdout=subprocess.PIPE,
+      shell=_USE_SHELL).communicate()
+  referees = out.splitlines()
+
+  for referee in referees:
+    with open(referee) as f:
+      original_contents = f.read()
+    contents = re.sub(original, replacement, original_contents)
+    if contents == original_contents:
+      raise Exception('No change in file %s although matched in grep' %
+                      referee)
+    with open(referee, 'wb') as f:
+      f.write(contents)
+
+  return referees
+
+
+def main():
+  parser = optparse.OptionParser(usage='''
+(1) %prog <options> REGEXP REPLACEMENT
+REGEXP uses full Python regexp syntax. REPLACEMENT can use back-references.
+
+(2) %prog <options> -i <file>
+<file> should contain a list (in Python syntax) of
+[REGEXP, REPLACEMENT, [GLOBS]] lists, e.g.:
+[
+  [r"(foo|bar)", r"\1baz", ["*.cc", "*.h"]],
+  ["54", "42"],
+]
+As shown above, [GLOBS] can be omitted for a given search-replace list, in which
+case the corresponding search-replace will use the globs specified on the
+command line.''')
+  parser.add_option('-d', action='store_true',
+                    dest='use_default_glob',
+                    help='Perform the change on C++ and Objective-C(++) source '
+                    'and header files.')
+  parser.add_option('-f', action='store_true',
+                    dest='force_unsafe_run',
+                    help='Perform the run even if there are uncommitted local '
+                    'changes.')
+  parser.add_option('-g', action='append',
+                    type='string',
+                    default=[],
+                    metavar="<glob>",
+                    dest='user_supplied_globs',
+                    help='Perform the change on the specified glob. Can be '
+                    'specified multiple times, in which case the globs are '
+                    'unioned.')
+  parser.add_option('-i', "--input_file",
+                    type='string',
+                    action='store',
+                    default='',
+                    metavar="<file>",
+                    dest='input_filename',
+                    help='Read arguments from <file> rather than the command '
+                    'line. NOTE: To be sure of regular expressions being '
+                    'interpreted correctly, use raw strings.')
+  opts, args = parser.parse_args()
+  if opts.use_default_glob and opts.user_supplied_globs:
+    print '"-d" and "-g" cannot be used together'
+    parser.print_help()
+    return 1
+
+  from_file = opts.input_filename != ""
+  if (from_file and len(args) != 0) or (not from_file and len(args) != 2):
+    parser.print_help()
+    return 1
+
+  if not opts.force_unsafe_run:
+    out, err = subprocess.Popen(['git', 'status', '--porcelain'],
+                                stdout=subprocess.PIPE,
+                                shell=_USE_SHELL).communicate()
+    if out:
+      print 'ERROR: This tool does not print any confirmation prompts,'
+      print 'so you should only run it with a clean staging area and cache'
+      print 'so that reverting a bad find/replace is as easy as running'
+      print '  git checkout -- .'
+      print ''
+      print 'To override this safeguard, pass the -f flag.'
+      return 1
+
+  global_file_globs = ['*.*']
+  if opts.use_default_glob:
+    global_file_globs = ['*.cc', '*.h', '*.m', '*.mm']
+  elif opts.user_supplied_globs:
+    global_file_globs = opts.user_supplied_globs
+
+  # Construct list of search-replace tasks.
+  search_replace_tasks = []
+  if opts.input_filename == '':
+    original = args[0]
+    replacement = args[1]
+    search_replace_tasks.append([original, replacement, global_file_globs])
+  else:
+    f = open(opts.input_filename)
+    search_replace_tasks = eval("".join(f.readlines()))
+    for task in search_replace_tasks:
+      if len(task) == 2:
+        task.append(global_file_globs)
+    f.close()
+
+  for (original, replacement, file_globs) in search_replace_tasks:
+    print 'File globs:  %s' % file_globs
+    print 'Original:    %s' % original
+    print 'Replacement: %s' % replacement
+    MultiFileFindReplace(original, replacement, file_globs)
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main())