Add slack to the list of ignored schemes

slack:// is a way to interact with a local Slack client [1], and is not
something that LinkChecker can check.

[1] https://api.slack.com/reference/deep-linking#client

linkcheck/checker/unknownurl.py

@@ -392,6 +392,7 @@ ignored_schemes_other = r"""
 |find       # Mozilla specific
 |isbn       # ISBN (int. book numbers)
 |javascript # JavaScript
+|slack      # Slack Technologies client
 """
 
 ignored_schemes = "^(%s%s%s%s)$" % (
@@ -403,4 +404,3 @@ ignored_schemes = "^(%s%s%s%s)$" % (
 ignored_schemes_re = re.compile(ignored_schemes, re.VERBOSE)
 
 is_unknown_scheme = ignored_schemes_re.match
-

scripts/update_iana_uri_schemes.py

@@ -15,6 +15,7 @@ iana_uri_schemes_other = {
     "find": "Mozilla specific",
     "isbn": "ISBN (int. book numbers)",
     "javascript": "JavaScript",
+    "slack": "Slack Technologies client",
 }
 
 filter_uri_schemes_permanent = (
@@ -77,7 +78,7 @@ def main(args):
         other=get_regex(iana_uri_schemes_other),
     )
     res = template % args
-    print(res)
+    print(res.rstrip())
     return 0
 
 

setup.cfg

@@ -45,6 +45,8 @@ per-file-ignores =
     tests/__init__.py: F401
 # E501: line too long
     linkcheck/ftpparse.py: E501
+    linkcheck/checker/unknownurl.py: E501
+    scripts/update_iana_uri_schemes.py: E501
     tests/test_ftpparse.py: E501
 # F821 undefined name
 # https://github.com/PyCQA/pyflakes/issues/548