Add new parameter --project_root to cpplint.py.

cpplint.py

 #!/usr/bin/env python
 #
 # Copyright (c) 2009 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #    * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
@@ skipping 506 matching lines @@
 _regexp_compile_cache = {}
 
 # {str, set(int)}: a map from error categories to sets of linenumbers
 # on which those errors are expected and should be suppressed.
 _error_suppressions = {}
 
 # The root directory used for deriving header guard CPP variable.
 # This is set by --root flag.
 _root = None
 
+# The project root directory. Used for deriving header guard CPP variable.
+# This is set by --project_root flag. Must be an absolute path.
+_project_root = None
+
 # The allowed line length of files.
 # This is set by --linelength flag.
 _line_length = 80
 
 # The allowed extensions for file names
 # This is set by --extensions flag.
 _valid_extensions = set(['cc', 'h', 'cpp', 'cu', 'cuh'])
 
 # {str, bool}: a map from error categories to booleans which indicate if the
 # category should be suppressed for every line.
@@ skipping 521 matching lines @@
     the name so that we get header guards that don't include things like
     "C:\Documents and Settings\..." or "/home/username/..." in them and thus
     people on different computers who have checked the source out to different
     locations won't see bogus errors.
     """
     fullname = self.FullName()
 
     if os.path.exists(fullname):
       project_dir = os.path.dirname(fullname)
 
+      if _project_root:
+        prefix = os.path.commonprefix([_project_root, project_dir])
+        return fullname[len(prefix) + 1:]
+
       if os.path.exists(os.path.join(project_dir, ".svn")):
         # If there's a .svn file in the current directory, we recursively look
         # up the directory tree for the top of the SVN checkout
         root_dir = project_dir
         one_up_dir = os.path.dirname(root_dir)
         while os.path.exists(os.path.join(one_up_dir, ".svn")):
           root_dir = os.path.dirname(root_dir)
           one_up_dir = os.path.dirname(one_up_dir)
 
         prefix = os.path.commonprefix([root_dir, project_dir])
@@ skipping 4932 matching lines @@
 
   Returns:
     The list of filenames to lint.
   """
   try:
     (opts, filenames) = getopt.getopt(args, '', ['help', 'output=', 'verbose=',
                                                  'counting=',
                                                  'filter=',
                                                  'root=',
                                                  'linelength=',
-                                                 'extensions='])
+                                                 'extensions=',
+                                                 'project_root='])
   except getopt.GetoptError:
     PrintUsage('Invalid arguments.')
 
   verbosity = _VerboseLevel()
   output_format = _OutputFormat()
   filters = ''
   counting_style = ''
 
   for (opt, val) in opts:
     if opt == '--help':
       PrintUsage(None)
     elif opt == '--output':
       if val not in ('emacs', 'vs7', 'eclipse'):
         PrintUsage('The only allowed output formats are emacs, vs7 and eclipse.')
       output_format = val
     elif opt == '--verbose':
       verbosity = int(val)
     elif opt == '--filter':
       filters = val
       if not filters:
         PrintCategories()
     elif opt == '--counting':
       if val not in ('total', 'toplevel', 'detailed'):
         PrintUsage('Valid counting options are total, toplevel, and detailed')
       counting_style = val
     elif opt == '--root':
       global _root
       _root = val
+    elif opt == '--project_root':
+      global _project_root
+      _project_root = val
+      if not os.path.isabs(_project_root):
+        PrintUsage('Project root must be an absolute path.')
     elif opt == '--linelength':
       global _line_length
       try:
           _line_length = int(val)
       except ValueError:
           PrintUsage('Line length must be digits.')
     elif opt == '--extensions':
       global _valid_extensions
       try:
           _valid_extensions = set(val.split(','))
@@ skipping 24 matching lines @@
   _cpplint_state.ResetErrorCounts()
   for filename in filenames:
     ProcessFile(filename, _cpplint_state.verbose_level)
   _cpplint_state.PrintErrorCounts()
 
   sys.exit(_cpplint_state.error_count > 0)
 
 
 if __name__ == '__main__':
   main()