Add script for checking git commit is safe

scripts/safe_template_linter.py

@@ -613,7 +613,7 @@ class FileResults(object):
 
         Arguments:
             options: A list of the following options:
-                is_quiet: True to print only file names, and False to print
+                list_files: True to print only file names, and False to print
                     all violations.
             out: output file
 
@@ -623,7 +623,7 @@ class FileResults(object):
 
         """
         num_violations = 0
-        if options['is_quiet']:
+        if options['list_files']:
             if self.violations is not None and 0 < len(self.violations):
                 num_violations += 1
                 print(self.full_path, file=out)
@@ -2326,33 +2326,33 @@ def main():
     parser = argparse.ArgumentParser(
         formatter_class=argparse.RawDescriptionHelpFormatter,
         description='Checks that templates are safe.',
-        epilog=epilog
+        epilog=epilog,
     )
     parser.add_argument(
-        '--quiet', dest='quiet', action='store_true', help='only display the filenames that contain violations'
-    )
-    parser.add_argument('--file', dest='file', nargs=1, default=None, help='a single file to lint')
-    parser.add_argument(
-        '--dir', dest='directory', nargs=1, default=['.'], help='the directory to lint (including sub-directories)'
+        '--list-files', dest='list_files', action='store_true',
+        help='Only display the filenames that contain violations.'
     )
+    parser.add_argument('path', nargs="?", default=None, help='A file to lint or directory to recursively lint.')
 
     args = parser.parse_args()
 
     options = {
-        'is_quiet': args.quiet,
+        'list_files': args.list_files,
     }
-
     template_linters = [MakoTemplateLinter(), UnderscoreTemplateLinter(), JavaScriptLinter(), PythonLinter()]
-    if args.file is not None:
-        if os.path.isfile(args.file[0]) is False:
-            raise ValueError("File [{}] is not a valid file.".format(args.file[0]))
-        num_violations = _process_file(args.file[0], template_linters, options, out=sys.stdout)
-    else:
-        if os.path.exists(args.directory[0]) is False or os.path.isfile(args.directory[0]) is True:
-            raise ValueError("Directory [{}] is not a valid directory.".format(args.directory[0]))
-        num_violations = _process_os_walk(args.directory[0], template_linters, options, out=sys.stdout)
 
-    if options['is_quiet'] is False:
+    if args.path is not None and os.path.isfile(args.path):
+        num_violations = _process_file(args.path, template_linters, options, out=sys.stdout)
+    else:
+        directory = "."
+        if args.path is not None:
+            if os.path.exists(args.path):
+                directory = args.path
+            else:
+                raise ValueError("Path [{}] is not a valid file or directory.".format(args.path))
+        num_violations = _process_os_walk(directory, template_linters, options, out=sys.stdout)
+
+    if options['list_files'] is False:
         # matches output of jshint for simplicity
         print("")
         print("{} violations found".format(num_violations))