Generate about:credits page automatically at build time.

tools/licenses.py

Index: tools/licenses.py
diff --git a/tools/licenses.py b/tools/licenses.py
index 10a8d330ec73559bc76c9b8090e411a83e5056da..da650f61d6787ffebbbc287c7b42efea31019f2b 100755
--- a/tools/licenses.py
+++ b/tools/licenses.py
@@ -401,8 +401,12 @@ def ScanThirdPartyDirs(root=None):
     return len(errors) == 0
 
 
-def GenerateCredits(root=None):
-    """Generate about:credits, dumping the result to stdout."""
+def GenerateCredits():
+    """Generate about:credits."""
+
+    if len(sys.argv) not in (2, 3):
+      print 'usage: licenses.py credits [output_file]'
+      return False
 
     def EvaluateTemplate(template, env, escape=True):
         """Expand a template with variables like {{foo}} using a
@@ -413,8 +417,7 @@ def GenerateCredits(root=None):
             template = template.replace('{{%s}}' % key, val)
         return template
 
-    if root is None:
-      root = os.getcwd()
+    root = os.path.join(os.path.dirname(__file__), '..')
     third_party_dirs = FindThirdPartyDirs(PRUNE_PATHS, root)
 
     entry_template = open(os.path.join(root, 'chrome', 'browser', 'resources',
@@ -444,9 +447,18 @@ def GenerateCredits(root=None):
 
     file_template = open(os.path.join(root, 'chrome', 'browser', 'resources',
                                       'about_credits.tmpl'), 'rb').read()
-    print "<!-- Generated by licenses.py; do not edit. -->"
-    print EvaluateTemplate(file_template, {'entries': '\n'.join(entries)},
-                           escape=False)
+    template_contents = "<!-- Generated by licenses.py; do not edit. -->"
+    template_contents += EvaluateTemplate(file_template,
+                                          {'entries': '\n'.join(entries)},
+                                          escape=False)
+
+    if len(sys.argv) == 3:
+      with open(sys.argv[2], 'w') as output_file:
+        output_file.write(template_contents)
+    elif len(sys.argv) == 2:
+      print template_contents
+
+    return True
 
 
 def main():