Add presubmit check to verify PPAPI C headers match IDL files.

Update outfile to print a better filename on diff.
Update fix missing 'name' in idl_generator.py

BUG= http://code.google.com/p/chromium/issues/detail?id=93534
TEST= gcl upload | presubmit (after modifying a .h or .idl file)
R= brettw@chromium.org
Review URL: http://codereview.chromium.org/7700001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@101092 0039d316-1c4b-4281-b951-d872f2087c98

ppapi/PRESUBMIT.py

@@ -0,0 +1,72 @@
+# Copyright (c) 2011 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.
+
+import os
+import sys
+import subprocess
+
+def CheckChange(input_api, output_api):
+  results = []
+
+  # Verify all modified *.idl have a matching *.h
+  files = input_api.LocalPaths()
+  h_files = []
+  idl_files = []
+
+  for filename in files:
+    name, ext = os.path.splitext(filename)
+    name_parts = name.split(os.sep)
+    if name_parts[0:2] == ['ppapi', 'c'] and ext == '.h':
+      h_files.append('/'.join(name_parts[2:]))
+    if name_parts[0:2] == ['ppapi', 'api'] and ext == '.idl':
+      idl_files.append('/'.join(name_parts[2:]))
+
+  # Generate a list of all appropriate *.h and *.idl changes in this CL.
+  both = h_files + idl_files
+
+  # If there aren't any, we are done checking.
+  if not both: return results
+
+  missing = []
+  for filename in idl_files:
+    if filename not in set(h_files):
+      missing.append('  ppapi/c/%s.h' % filename)
+  for filename in h_files:
+    if filename not in set(idl_files):
+      missing.append('  ppapi/api/%s.idl' % filename)
+
+  if missing:
+    results.append(
+        output_api.PresubmitPromptWarning('Missing matching PPAPI definition:',
+                                          long_text='\n'.join(missing)))
+
+  # Verify all *.h files match *.idl definitions, use:
+  #   --test to prevent output to disk
+  #   --diff to generate a unified diff
+  #   --out to pick which files to examine (only the ones in the CL)
+  ppapi_dir = input_api.PresubmitLocalPath()
+  cmd = [ sys.executable, 'generator.py',
+          '--wnone', '--diff', '--test','--cgen', '--range=M13,M14']
+
+  # Only generate output for IDL files references (as *.h or *.idl) in this CL
+  cmd.append('--out=' + ','.join([name + '.idl' for name in both]))
+
+  p = subprocess.Popen(cmd, cwd=os.path.join(ppapi_dir, 'generators'),
+                       stdout=subprocess.PIPE,
+                       stderr=subprocess.PIPE)
+  (p_stdout, p_stderr) = p.communicate()
+  if p.returncode:
+    results.append(
+        output_api.PresubmitError('PPAPI IDL Diff detected: Run the generator.',
+                                  long_text=p_stderr))
+  return results
+
+def CheckChangeOnUpload(input_api, output_api):
+#  return []
+  return CheckChange(input_api, output_api)
+
+def CheckChangeOnCommit(input_api, output_api):
+#  return []
+  return CheckChange(input_api, output_api)
+

ppapi/generators/idl_generator.py

@@ -146,7 +146,7 @@ def GenerateRange(self, ast, releases, options):
     cnt = 0
     for filenode in ast.GetListOf('File'):
       # Skip this file if not required
-      if outlist and name not in outlist:
+      if outlist and filenode.GetName() not in outlist:
         continue
 
       # If this file has errors, skip it

ppapi/generators/idl_outfile.py

@@ -92,7 +92,9 @@ def Close(self):
 
     if GetOption('diff'):
       for line in difflib.unified_diff(intext.split('\n'), outtext.split('\n'),
-                                     self.filename, 'NEW', n=1, lineterm=''):
+                                       'OLD ' + self.filename,
+                                       'NEW ' + self.filename,
+                                       n=1, lineterm=''):
         ErrOut.Log(line)
 
     try: