Support '--order=maintainer'

piplicenses.py

@@ -576,6 +576,8 @@ def get_sortby(args: CustomNamespace) -> str:
         return "Name"
     elif args.order == OrderArg.AUTHOR and args.with_authors:
         return "Author"
+    elif args.order == OrderArg.MAINTAINER and args.with_maintainers:
+        return "Maintainer"
     elif args.order == OrderArg.URL and args.with_urls:
         return "URL"
 
@@ -744,6 +746,7 @@ class OrderArg(NoValueEnum):
     LICENSE = L = auto()
     NAME = N = auto()
     AUTHOR = A = auto()
+    MAINTAINER = M = auto()
     URL = U = auto()
 
 

test_piplicenses.py

@@ -470,6 +470,13 @@ def test_order_author(self) -> None:
         sortby = get_sortby(args)
         self.assertEqual("Author", sortby)
 
+    def test_order_maintainer(self) -> None:
+        order_maintainer_args = ["--order=maintainer", "--with-maintainers"]
+        args = self.parser.parse_args(order_maintainer_args)
+
+        sortby = get_sortby(args)
+        self.assertEqual("Maintainer", sortby)
+
     def test_order_url(self) -> None:
         order_url_args = ["--order=url", "--with-urls"]
         args = self.parser.parse_args(order_url_args)