Greatly improve (non-android) java support

build/android/gyp/create_java_binary_script.py

Index: build/android/gyp/create_java_binary_script.py
diff --git a/build/android/gyp/create_java_binary_script.py b/build/android/gyp/create_java_binary_script.py
new file mode 100755
index 0000000000000000000000000000000000000000..7b1f3a3c7c97b30a3d37d087bf0e41f35b192d75
--- /dev/null
+++ b/build/android/gyp/create_java_binary_script.py
@@ -0,0 +1,76 @@
+#!/usr/bin/env python
+#
+# Copyright 2014 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.
+
+"""Creates a simple script to run a java "binary".
+
+This creates a script that sets up the java command line for running a java
+jar. This includes correctly setting the classpath and the main class.
+"""
+
+import optparse
+import os
+import sys
+
+from util import build_utils
+
+script_template = """\
+#!/usr/bin/env python
+#
+# Copyright 2014 The Chromium Authors. All rights reserved.

[newt (away), 2014/11/03 22:12:44]

Generated files probably don't need a copyright header

[cjhopman, 2014/11/15 03:37:59]

Done.

+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+#
+# This file was generated by build/android/gyp/create_java_binary_script.py
+
+import os
+import select

[newt (away), 2014/11/03 22:12:44]

not used

[cjhopman, 2014/11/15 03:37:58]

Done.

+import subprocess
+import sys
+
+self_dir = os.path.dirname(__file__)
+classpath = [%s]

[newt (away), 2014/11/03 22:12:44]

s/%s/{classpath}

and use "".format() below instead of %

[cjhopman, 2014/11/15 03:37:59]

Done.

+if os.getcwd() != self_dir:

[newt (away), 2014/11/03 22:12:44]

you could just cd into self_dir, instead of doing this offset business

[cjhopman, 2014/11/15 03:37:59]

Added a comment above the script_template that explains what it is doing and,
more importantly, why

+  offset = os.path.relpath(self_dir, os.getcwd())
+  classpath = [os.path.join(offset, p) for p in classpath]
+javac_cmd = ["java", "-classpath", ":".join(classpath), \"%s\"] + sys.argv[1:]

[newt (away), 2014/11/03 22:12:44]

s/%s/{main_class}

[cjhopman, 2014/11/15 03:37:58]

Done.

+javac = subprocess.Popen(javac_cmd, stdout=sys.stdout, stderr=sys.stderr)

[newt (away), 2014/11/03 22:12:44]

You could use os.execv(), which avoids the need to redirect stdout and stderr,
call wait(), or mimic javac's return code.

[cjhopman, 2014/11/15 03:37:59]

Done.

+javac.wait()
+sys.exit(javac.returncode)
+"""
+
+def main(argv):
+  argv = build_utils.ExpandFileArgs(argv)
+  parser = optparse.OptionParser()
+  build_utils.AddDepfileOption(parser)
+  parser.add_option('--output', help='Output path for executable script.')
+  parser.add_option('--jar-path', help='Path to the main jar.')
+  parser.add_option('--main-class',
+      help='Name of the java class with the "main" entry point.')
+  parser.add_option('--classpath', action='append',
+      help='Classpath for running the jar.')
+  options, _ = parser.parse_args(argv)
+
+  classpath = [ options.jar_path ]

[newt (away), 2014/11/03 22:12:44]

nit: remove spaces

[cjhopman, 2014/11/15 03:37:58]

Done.

+  for cp_arg in options.classpath:
+    classpath += build_utils.ParseGypList(cp_arg)
+
+  run_dir = os.path.dirname(options.output)
+  classpath = [os.path.relpath(p, run_dir) for p in classpath]
+
+  with open(options.output, 'w') as script:
+    script.write(script_template %
+        ("\"%s\"" % "\", \"".join(classpath), options.main_class))
+
+  os.chmod(options.output, 0744)

[newt (away), 2014/11/03 22:12:44]

Why not 750? (like most of our python scripts?)

[cjhopman, 2014/11/15 03:37:59]

Done.

+
+  if options.depfile:
+    build_utils.WriteDepfile(
+        options.depfile,
+        build_utils.GetPythonDependencies())
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv[1:]))