[opt-viewer] opt-viewer.py takes -o argument

[modocache]

Summary

Change how the output directory is specified when invoking
opt-viewer.py, from opt-viewer.py yaml_file_one yaml_file_two output_dir to
opt-viewer.py -o output_dir yaml_file_one yaml_file_two.

This makes it easier to pipe the results of another command into
opt-viewer.py. For example:

find . -name "*.yaml" -print | xargs /path/to/opt-viewer.py -o html

[anemet]

Great! LGTM.

[modocache]

Great, thanks for the review! :)

utils/opt-viewer/opt-viewer.py

def generate_report(pmap, all_remarks, file_remarks, source_dir, output_dir, should_display_hotness):
 
     shutil.copy(os.path.join(os.path.dirname(os.path.realpath(__file__)),
             "style.css"), output_dir)
 
 
 if __name__ == '__main__':
     parser = argparse.ArgumentParser(description=desc)
     parser.add_argument('yaml_files', nargs='+')
-    parser.add_argument('output_dir')
+    parser.add_argument(
+        '--output-dir',
+        '-o',
+        default='html',
+        help='Path to a directory where generated HTML files will be output. '
+             'If the directory does not already exist, it will be created. '
+             '"%(default)s" by default.')
     parser.add_argument(
         '--jobs',
         '-j',
         default=cpu_count(),
         type=int,
         help='Max job count (defaults to %(default)s, the current CPU count)')
     parser.add_argument(
         '-source-dir',