| #!/usr/bin/env python |
| |
| # Copyright (c) 2010 Google Inc. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| import sys |
| import time |
| |
| output = sys.argv[1] |
| persistoutput = "%s.persist" % sys.argv[1] |
| |
| count = 0 |
| try: |
| count = open(persistoutput, 'r').read() |
| except: |
| pass |
| count = int(count) + 1 |
| |
| if len(sys.argv) > 2: |
| max_count = int(sys.argv[2]) |
| if count > max_count: |
| count = max_count |
| |
| oldcount = 0 |
| try: |
| oldcount = open(output, 'r').read() |
| except: |
| pass |
| |
| # Save the count in a file that is undeclared, and thus hidden, to gyp. We need |
| # to do this because, prior to running commands, scons deletes any declared |
| # outputs, so we would lose our count if we just wrote to the given output file. |
| # (The other option is to use Precious() in the scons generator, but that seems |
| # too heavy-handed just to support this somewhat unrealistic test case, and |
| # might lead to unintended side-effects). |
| open(persistoutput, 'w').write('%d' % (count)) |
| |
| # Only write the given output file if the count has changed. |
| if int(oldcount) != count: |
| open(output, 'w').write('%d' % (count)) |
| # Sleep so the next run changes the file time sufficiently to make the build |
| # detect the file as changed. |
| time.sleep(1) |
| |
| sys.exit(0) |
