Add experimental support for python in 'git cl format'

gclient_utils.py

 # Copyright (c) 2012 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.
 
 """Generic utils."""
 
 import codecs
 import cStringIO
 import datetime
 import logging
@@ skipping 680 matching lines @@
   """Returns the full path to the buildtools directory.
   This is based on the root of the checkout containing the current directory."""
 
   # Overriding the build tools path by environment is highly unsupported and may
   # break without warning.  Do not rely on this for anything important.
   override = os.environ.get('CHROMIUM_BUILDTOOLS_PATH')
   if override is not None:
     return override
 
   primary_solution = GetPrimarySolutionPath()
+  if not primary_solution:
+    return None
   buildtools_path = os.path.join(primary_solution, 'buildtools')
   if not os.path.exists(buildtools_path):
     # Buildtools may be in the gclient root.
     gclient_root = FindGclientRoot(os.getcwd())
     buildtools_path = os.path.join(gclient_root, 'buildtools')
   return buildtools_path
 
 
 def GetBuildtoolsPlatformBinaryPath():
   """Returns the full path to the binary directory for the current platform."""
@@ skipping 453 matching lines @@
 
       # (Windows) Query 'NUMBER_OF_PROCESSORS' environment variable.
       if 'NUMBER_OF_PROCESSORS' in os.environ:
         return int(os.environ['NUMBER_OF_PROCESSORS'])
   except Exception as e:
     logging.exception("Exception raised while probing CPU count: %s", e)
 
   logging.debug('Failed to get CPU count. Defaulting to 1.')
   return 1
 
+
 def DefaultDeltaBaseCacheLimit():
   """Return a reasonable default for the git config core.deltaBaseCacheLimit.
 
   The primary constraint is the address space of virtual memory.  The cache
   size limit is per-thread, and 32-bit systems can hit OOM errors if this
   parameter is set too high.
   """
   if platform.architecture()[0].startswith('64'):
     return '2g'
   else:
     return '512m'
 
+
 def DefaultIndexPackConfig(url=''):
   """Return reasonable default values for configuring git-index-pack.
 
   Experiments suggest that higher values for pack.threads don't improve
   performance."""
   cache_limit = DefaultDeltaBaseCacheLimit()
   result = ['-c', 'core.deltaBaseCacheLimit=%s' % cache_limit]
   if url in THREADED_INDEX_PACK_BLACKLIST:
     result.extend(['-c', 'pack.threads=1'])
   return result
+
+
+def FindExecutable(executable):
+  """This mimics the "which" utility."""
+  path_folders = os.environ.get('PATH').split(os.pathsep)
+
+  for path_folder in path_folders:
+    target = os.path.join(path_folder, executable)
+    # Just incase we have some ~/blah paths.
+    target = os.path.abspath(os.path.expanduser(target))
+    if os.path.isfile(target) and os.access(target, os.X_OK):
+      return target
+    if sys.platform.startswith('win'):
+      for suffix in ('.bat', '.cmd', '.exe'):
+        alt_target = target + suffix
+        if os.path.isfile(alt_target) and os.access(alt_target, os.X_OK):
+          return alt_target
+  return None