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diff --git a/third_party/clang_format/scripts/clang-format.py b/third_party/clang_format/scripts/clang-format.py
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+++ b/third_party/clang_format/scripts/clang-format.py
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+# This file is a minimal clang-format vim-integration. To install:
+# - Change 'binary' if clang-format is not on the path (see below).
+# - Add to your .vimrc:
+#
+#   map <C-I> :pyf <path-to-this-file>/clang-format.py<CR>
+#   imap <C-I> <ESC>:pyf <path-to-this-file>/clang-format.py<CR>i
+#
+# The first line enables clang-format for NORMAL and VISUAL mode, the second
+# line adds support for INSERT mode. Change "C-I" to another binding if you
+# need clang-format on a different key (C-I stands for Ctrl+i).
+#
+# With this integration you can press the bound key and clang-format will
+# format the current line in NORMAL and INSERT mode or the selected region in
+# VISUAL mode. The line or region is extended to the next bigger syntactic
+# entity.
+#
+# It operates on the current, potentially unsaved buffer and does not create
+# or save any files. To revert a formatting, just undo.
+
+import difflib
+import json
+import subprocess
+import sys
+import vim
+
+# Change this to the full path if clang-format is not on the path.
+binary = 'clang-format'
+
+# Change this to format according to other formatting styles. See the output of
+# 'clang-format --help' for a list of supported styles. The default looks for
+# a '.clang-format' or '_clang-format' file to indicate the style that should be
+# used.
+style = 'file'
+
+# Get the current text.
+buf = vim.current.buffer
+text = '\n'.join(buf)
+
+# Determine range to format.
+cursor = int(vim.eval('line2byte(line("."))+col(".")')) - 2
+lines = '%s:%s' % (vim.current.range.start + 1, vim.current.range.end + 1)
+
+# Avoid flashing an ugly, ugly cmd prompt on Windows when invoking clang-format.
+startupinfo = None
+if sys.platform.startswith('win32'):
+  startupinfo = subprocess.STARTUPINFO()
+  startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
+  startupinfo.wShowWindow = subprocess.SW_HIDE
+
+# Call formatter.
+command = [binary, '-lines', lines, '-style', style, '-cursor', str(cursor)]
+if vim.current.buffer.name:
+  command.extend(['-assume-filename', vim.current.buffer.name])
+p = subprocess.Popen(command,
+                     stdout=subprocess.PIPE, stderr=subprocess.PIPE,
+                     stdin=subprocess.PIPE, startupinfo=startupinfo)
+stdout, stderr = p.communicate(input=text)
+
+# If successful, replace buffer contents.
+if stderr:
+  message = stderr.splitlines()[0]
+  parts = message.split(' ', 2)
+  if len(parts) > 2:
+    message = parts[2]
+  print 'Formatting failed: %s (total %d warnings, %d errors)' % (
+      message, stderr.count('warning:'), stderr.count('error:'))
+
+if not stdout:
+  print ('No output from clang-format (crashed?).\n' +
+      'Please report to bugs.llvm.org.')
+else:
+  lines = stdout.split('\n')
+  output = json.loads(lines[0])
+  lines = lines[1:]
+  sequence = difflib.SequenceMatcher(None, vim.current.buffer, lines)
+  for op in reversed(sequence.get_opcodes()):
+    if op[0] is not 'equal':
+      vim.current.buffer[op[1]:op[2]] = lines[op[3]:op[4]]
+  vim.command('goto %d' % (output['Cursor'] + 1))