tools/versions: alphabetize subcommands

In help, and in the codebase.

Author: bgilbert

tools/versions.py

@@ -262,6 +262,13 @@ def do_autoupdate(args: Namespace) -> None:
         raise Exception(f"Couldn't update {failures} wraps")
 
 
+def do_libtool_ver(args: Namespace) -> None:
+    components = args.info.split(':', 2)
+    components += ['0'] * (3 - len(components))
+    current, revision, age = (int(c) for c in components)
+    print(f'{current - age}.{age}.{revision}')
+
+
 def do_list(args: Namespace) -> None:
     # set default flags
     if not any((args.official, args.port)):
@@ -355,13 +362,6 @@ def do_list(args: Namespace) -> None:
             print(line)
 
 
-def do_libtool_ver(args: Namespace) -> None:
-    components = args.info.split(':', 2)
-    components += ['0'] * (3 - len(components))
-    current, revision, age = (int(c) for c in components)
-    print(f'{current - age}.{age}.{revision}')
-
-
 def main() -> None:
     parser = ArgumentParser(
         prog='versions.py',
@@ -388,6 +388,17 @@ def main() -> None:
     )
     autoupdate.set_defaults(func=do_autoupdate)
 
+    libtool_ver = subparsers.add_parser(
+        'libtool-ver',
+        aliases=['ltv'],
+        help='calculate library version from libtool version-info',
+        description='Calculate library version number from libtool version-info.',
+    )
+    libtool_ver.add_argument(
+        'info', metavar='version-info', help='libtool current:revision:age'
+    )
+    libtool_ver.set_defaults(func=do_libtool_ver)
+
     list = subparsers.add_parser(
         'list',
         aliases=['ls'],
@@ -433,17 +444,6 @@ def main() -> None:
     )
     list.set_defaults(func=do_list)
 
-    libtool_ver = subparsers.add_parser(
-        'libtool-ver',
-        aliases=['ltv'],
-        help='calculate library version from libtool version-info',
-        description='Calculate library version number from libtool version-info.',
-    )
-    libtool_ver.add_argument(
-        'info', metavar='version-info', help='libtool current:revision:age'
-    )
-    libtool_ver.set_defaults(func=do_libtool_ver)
-
     args = parser.parse_args()
     args.func(args)