Generate compiled_resources2.gyp for Polymer based on <link rel=import>s

tools/polymer/generate_compiled_resources_gypi.py

Index: tools/polymer/generate_compiled_resources_gypi.py
diff --git a/tools/polymer/generate_compiled_resources_gypi.py b/tools/polymer/generate_compiled_resources_gypi.py
new file mode 100755
index 0000000000000000000000000000000000000000..eedbfc1db51ec1d21193e8b19718b96799a87212
--- /dev/null
+++ b/tools/polymer/generate_compiled_resources_gypi.py
@@ -0,0 +1,63 @@
+#!/usr/bin/env python
+# Copyright 2016 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.
+
+from bs4 import BeautifulSoup
+from datetime import date
+import os.path as path
+import pprint
+import sys
+
+
+_SRC = path.join(path.dirname(path.abspath(__file__)), "..", "..")
+_COMPILE_JS = path.join(
+    _SRC, "third_party", "closure_compiler", "compile_js2.gypi")
+_POLYMERS = ['polymer%s.html' % p for p in ('', '-mini', '-micro')]
+
+
+def main(html_files):
+  targets = []
+
+  for html_file in html_files:
+    basename = path.basename(html_file)
+    if basename in _POLYMERS:
+      continue
+
+    dependencies = []
+
+    parsed = BeautifulSoup(open(html_file), "html.parser")
+    imports = set(i.get("href") for i in parsed.find_all("link", rel="import"))
+
+    for html_import in sorted(imports):
+      dirname, import_basename = path.split(html_import)
+      if import_basename in _POLYMERS:
+        continue
+      target = "compiled_resources2.gyp:" + import_basename[:-5] + "-extracted"
+      dependencies.append(path.join(dirname, target))
+
+    target = {
+      "includes": [path.relpath(_COMPILE_JS, path.dirname(html_file))],
+      "target_name": basename[:-5] + "-extracted",
+    }
+
+    if dependencies:
+      target["dependencies"] = dependencies
+
+    targets.append(target)
+
+  if not targets:
+    return
+
+  print """
+# Copyright %d 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.
+""".strip() % date.today().year
+
+  pp = pprint.PrettyPrinter(indent=2)
+  pp.pprint({"targets": targets})
+
+
+if __name__ == "__main__":
+  main(sys.argv[1:])