Hook up .d files and outputs to grit

build/secondary/tools/grit/stamp_grit_sources.py

Index: build/secondary/tools/grit/stamp_grit_sources.py
diff --git a/build/secondary/tools/grit/stamp_grit_sources.py b/build/secondary/tools/grit/stamp_grit_sources.py
new file mode 100644
index 0000000000000000000000000000000000000000..59eef88f83b1ab5dfe7ac0784e7621520d82208b
--- /dev/null
+++ b/build/secondary/tools/grit/stamp_grit_sources.py
@@ -0,0 +1,46 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.

[viettrungluu, 2014/07/21 19:43:17]

Please run pylint on this script.

[brettw, 2014/07/21 20:11:19]

Done.

+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# This script enumerates the files in the given directory, writing an empty
+# stamp file and a .d file listing the inputs required to make the stamp. This
+# allows us to dynamically depend on the grit sources without enumerating the
+# grit directory for every invocation of grit (which is what adding the source
+# files to every .grd file's .d file would entail) or shelling out to grit
+# synchronously during GN execution to get the list (which would be slow).
+#
+# Usage:
+#    stamp_grit_sources.py <directory> <stamp-file> <.d-file>

[viettrungluu, 2014/07/21 19:43:17]

It seems to me that this isn't very grit-specific at all, and would probably be
useful for various other things (written in python, for example) as well.

[brettw, 2014/07/21 20:11:19]

Yes, I'm going to keep that in mind, but I don't want tp preemptively add this
to the build directory with no other users.

+
+import os
+import sys
+
+def GritSourceFiles(grit_root_dir):
+  files = []
+  for root, dirs, filenames in os.walk(grit_root_dir):

[viettrungluu, 2014/07/21 19:43:17]

It's conventional to use _ for any variable you're going to ignore (dirs in this
case).

[brettw, 2014/07/21 20:11:19]

Done.

+    grit_src = [os.path.join(root, f) for f in filenames
+                if f.endswith('.py') and not f.endswith('_unittest.py')]
+    files.extend(grit_src)
+  files = [f.replace('\\', '/') for f in files]
+  return sorted(files)
+
+def WriteDepFile(dep_file, stamp_file, source_files):
+  with open(dep_file, "w") as f:
+    f.write(stamp_file)
+    f.write(": ")
+    f.write(' '.join(source_files))
+
+def WriteStampFile(stamp_file):
+  with open(stamp_file, "w"):
+    pass
+
+if len(sys.argv) != 4:

[viettrungluu, 2014/07/21 19:43:17]

Please put all of this in a main() function (or Main(), if you want; our style
is somewhat inconsistent on this).

[brettw, 2014/07/21 20:11:19]

Done.

+  print "Error: expecting 3 args."
+  sys.exit(1)
+
+grit_root_dir = sys.argv[1]
+stamp_file = sys.argv[2]
+dep_file = sys.argv[3]
+
+WriteStampFile(stamp_file)
+WriteDepFile(dep_file, stamp_file, GritSourceFiles(grit_root_dir))