replace all non-word characters with wordify

Use the regular expression set \W to replace all non-word characters
instead of the fixed set [-.\s:] in wordify. Add a test for subcommands
containing slashes in their name as an example. This could be tested
more robustly.

shtab/__init__.py

@@ -129,8 +129,8 @@ def complete2pattern(opt_complete, shell: str, choice_type2fn) -> str:
 
 
 def wordify(string: str) -> str:
-    """Replace non-word chars [-. :] with underscores [_]"""
-    return re.sub(r"[-.\s:]", "_", string)
+    r"""Replace non-word chars [\W] with underscores [_]"""
+    return re.sub(r"\W", "_", string)
 
 
 def get_public_subcommands(sub):

tests/test_shtab.py

@@ -241,6 +241,25 @@ def test_subparser_colons(shell, caplog):
     assert not caplog.record_tuples
 
 
+@fix_shell
+def test_subparser_slashes(shell, caplog):
+    parser = ArgumentParser(prog="test")
+    subparsers = parser.add_subparsers()
+    subparsers.add_parser("sub/cmd", help="help message")
+    with caplog.at_level(logging.INFO):
+        completion = shtab.complete(parser, shell=shell)
+    print(completion)
+
+    if shell == "bash":
+        shell = Bash(completion)
+        shell.compgen('-W "${_shtab_test_subparsers[*]}"', "s", "sub/cmd")
+        shell.compgen('-W "${_shtab_test_pos_0_choices[*]}"', "s", "sub/cmd")
+        shell.test('-z "${_shtab_test_COMPGEN-}"')
+    elif shell == "zsh":
+        # make sure the slash was properly substituted to avoid syntax errors
+        assert "_shtab_test_sub/cmd" not in completion
+
+
 @fix_shell
 def test_add_argument_to_optional(shell, caplog):
     parser = ArgumentParser(prog="test")