Add argument groups

piplicenses.py

@@ -622,26 +622,30 @@ def create_parser():
     parser = CompatibleArgumentParser(
         description=__summary__)
 
+    common_options = parser.add_argument_group('Common options')
+    format_options = parser.add_argument_group('Format options')
+    verify_options = parser.add_argument_group('Verify options')
+
     parser.add_argument(
         '-v', '--version',
         action='version',
         version='%(prog)s ' + __version__)
 
-    parser.add_argument(
+    common_options.add_argument(
         '--from',
         action='store', type=str,
         default='mixed', metavar='SOURCE',
         help=('where to find license information\n'
               '"meta", "classifier, "mixed", "all"\n'
               'default: --from=mixed'))
-    parser.add_argument(
+    common_options.add_argument(
         '-o', '--order',
         action='store', type=str,
         default='name', metavar='COL',
         help=('order by column\n'
               '"name", "license", "author", "url"\n'
               'default: --order=name'))
-    parser.add_argument(
+    common_options.add_argument(
         '-f', '--format',
         action='store', type=str,
         default='plain', metavar='STYLE',
@@ -650,78 +654,78 @@ def create_parser():
               '"confluence", "html", "json", \n'
               '"json-license-finder",  "csv"\n'
               'default: --format=plain'))
-    parser.add_argument(
+    common_options.add_argument(
         '--summary',
         action='store_true',
         default=False,
         help='dump summary of each license')
-    parser.add_argument(
+    common_options.add_argument(
         '--output-file',
         action='store', type=str,
         help='save license list to file')
-    parser.add_argument(
+    common_options.add_argument(
         '-i', '--ignore-packages',
         action='store', type=str,
         nargs='+', metavar='PKG',
         default=[],
         help='ignore package name in dumped list')
 
-    parser.add_argument(
+    format_options.add_argument(
         '-s', '--with-system',
         action='store_true',
         default=False,
         help='dump with system packages')
-    parser.add_argument(
+    format_options.add_argument(
         '-a', '--with-authors',
         action='store_true',
         default=False,
         help='dump with package authors')
-    parser.add_argument(
+    format_options.add_argument(
         '-u', '--with-urls',
         action='store_true',
         default=False,
         help='dump with package urls')
-    parser.add_argument(
+    format_options.add_argument(
         '-d', '--with-description',
         action='store_true',
         default=False,
         help='dump with short package description')
-    parser.add_argument(
+    format_options.add_argument(
         '-l', '--with-license-file',
         action='store_true',
         default=False,
         help='dump with location of license file and '
              'contents, most useful with JSON output')
-    parser.add_argument(
+    format_options.add_argument(
         '--no-license-path',
         action='store_true',
         default=False,
         help='when specified together with option -l, '
              'suppress location of license file output')
-    parser.add_argument(
+    format_options.add_argument(
         '--with-notice-file',
         action='store_true',
         default=False,
         help='when specified together with option -l, '
              'dump with location of license file and contents')
-    parser.add_argument(
+    format_options.add_argument(
         '--filter-strings',
         action="store_true",
         default=False,
         help=('filter input according to code page'))
-    parser.add_argument(
+    format_options.add_argument(
         '--filter-code-page',
         action="store", type=str,
         default="latin1",
         help=('specify code page for filtering'))
 
-    parser.add_argument(
+    verify_options.add_argument(
         '--fail-on',
         action='store', type=str,
         default=None,
         help='fail (exit with code 1) on the first occurrence '
              'of the licenses of the semicolon-separated list')
-    parser.add_argument(
+    verify_options.add_argument(
         '--allow-only',
         action='store', type=str,
         default=None,