Created infra/tools/new_tool

infra/tools/new_tool/new_tool.py

Index: infra/tools/new_tool/new_tool.py
diff --git a/infra/tools/new_tool/new_tool.py b/infra/tools/new_tool/new_tool.py
new file mode 100644
index 0000000000000000000000000000000000000000..b0f06ab743e184e16b770369b53df52a5fd88dd3
--- /dev/null
+++ b/infra/tools/new_tool/new_tool.py
@@ -0,0 +1,100 @@
+# Copyright 2015 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.
+
+import datetime
+import os
+
+# infra subdirectory containing tools.
+TOOL_DIR = os.path.dirname(os.path.dirname(__file__))
+TEMPLATE_DIR = os.path.join(os.path.dirname(__file__), 'templates')
+
+COPYRIGHT_NOTICE = """\
+# Copyright %s 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.
+""" % datetime.datetime.now().strftime('%Y')
+
+
+def add_argparse_options(parser):  # pragma: no cover

[Sergey Berezin, 2015/06/11 17:33:16]

why no cover? I'd add at least a smoke test, just to avoid silly typos in this
code.

+  parser.add_argument(
+      'name', metavar='name', type=str, nargs=1,
+      help='The name of the new tool.')
+
+  parser.add_argument('--base-dir', default=TOOL_DIR,
+                      help='Directory where to create the tool. Default: '
+                      '%(default)s')
+
+
+def generate_python_file(dirpath, filename, template,
+                         template_dir=TEMPLATE_DIR, **kwargs):
+  """Generate a python file based on a template.
+
+  This function does nothing if the target file already exists.
+
+  Args:
+    dirpath (str): directory where to create the file.
+    filename (str): base name of file to generate.
+    template (str): name of the template file (without extension)
+
+  Keywords Args:
+    template_dir (str): path to the directory where templates are stored.
+    kwargs (dict): passed to the template.
+
+  Return:
+    filename (str): path to the file that has been generated.
+  """
+  file_path = os.path.join(dirpath, filename + '.py')
+  if os.path.isfile(file_path):
+    print 'Skipping existing file %s' % file_path
+    return file_path
+
+  if template:
+    with open(os.path.join(template_dir, template + '.template'), 'r') as f:
+      MAIN_CONTENT = f.read().format(**kwargs)
+  else:
+    MAIN_CONTENT = ''
+
+  with open(file_path, 'w') as f:
+    f.write(COPYRIGHT_NOTICE)
+    f.write(MAIN_CONTENT)
+  return file_path
+
+
+def generate_tool_files(toolname, base_dir):
+  """Generate a stub tool from template files.
+
+  Args:
+    toolname (str): name of the tool. This is also the name of the directory
+      generated.
+    base_dir (str): path to the directory where to create the files.
+
+  Return:
+    tool_path (str or None): directory created or None is nothing has been done.
+  """
+
+  if not os.path.isdir(base_dir):
+    print 'Destination directory does not exist'
+    return 1
+
+  tool_dir = os.path.join(base_dir, toolname)
+  if os.path.exists(tool_dir):
+    print 'Tool seems to already exists: %s\nAborting.' % tool_dir
+    return 1
+
+  print 'Generating %s...' % tool_dir
+  os.mkdir(tool_dir)
+  generate_python_file(tool_dir, '__init__', None)
+  generate_python_file(tool_dir, '__main__', 'main',
+                       toolname=toolname,
+                       Toolname=toolname.capitalize())
+  generate_python_file(tool_dir, toolname, 'tool',
+                       Toolname=toolname.capitalize())
+
+  test_dir = os.path.join(tool_dir, 'test')
+  os.mkdir(test_dir)
+  generate_python_file(test_dir, '__init__', None)
+  generate_python_file(test_dir, toolname + '_test', 'test',
+                       toolname=toolname,
+                       tested_file=toolname)
+  print 'Done.'