Rewrite cpplint script in python.

script/cpplint

@@ -1,26 +0,0 @@
-#!/bin/bash
-
-cd "`dirname $0`/.."
-
-# List all Objective-C headers here, should not cpplint them.
-OBJC_HEADERS='
-browser/atom_event_processing_window.h
-browser/atom_application_mac.h
-browser/atom_application_delegate_mac.h
-browser/native_window_mac.h
-browser/nsalert_synchronous_sheet.h
-common/api/api_messages.cc
-common/api/api_messages.h'
-
-FILES=`find app browser common renderer -type f -name '*.h' -or -name '*.cc'`
-FILTERED_FILES=
-
-while read file; do
-  if ! echo "$OBJC_HEADERS" | grep "$file" > /dev/null ; then
-    FILTERED_FILES="$FILTERED_FILES $file"
-  fi
-done <<< "$FILES"
-
-python ./vendor/cpplint.py \
-  --filter=-build/header_guard,-build/include_what_you_use \
-  $FILTERED_FILES

script/cpplint.py

@@ -0,0 +1,45 @@
+#!/usr/bin/env python
+
+import fnmatch
+import os
+import subprocess
+import sys
+
+OBJC_HEADERS = [
+  'browser/atom_event_processing_window.h',
+  'browser/atom_application_mac.h',
+  'browser/atom_application_delegate_mac.h',
+  'browser/native_window_mac.h',
+  'browser/nsalert_synchronous_sheet.h',
+  'common/api/api_messages.cc',
+  'common/api/api_messages.h',
+]
+
+SOURCE_ROOT = os.path.dirname(os.path.dirname(__file__))
+
+
+def main():
+  os.chdir(SOURCE_ROOT)
+  files = list_files(['app', 'browser', 'common', 'renderer'],
+                     ['*.cc', '*.h'])
+  call_cpplint(list(set(files) - set(OBJC_HEADERS)))
+
+
+def list_files(directories, filters):
+  matches = []
+  for directory in directories:
+    for root, dirs, filenames, in os.walk(directory):
+      for f in filters:
+        for filename in fnmatch.filter(filenames, f):
+          matches.append(os.path.join(root, filename))
+  return matches
+
+
+def call_cpplint(files):
+  cpplint = os.path.join(SOURCE_ROOT, 'vendor', 'cpplint.py')
+  rules = '--filter=-build/header_guard,-build/include_what_you_use'
+  subprocess.call([sys.executable, cpplint, rules] + files)
+
+
+if __name__ == '__main__':
+  sys.exit(main())