Cannot build using Sphinx v4.5.0

[MrAlois]

I'm trying to figure out some convenient way to generate html for endpoints in our organization and since I came across your plugin, I was ecstatic.

Unfortunately I am unable to compile the project correctly after using the plugin. As far as I can see, the project looks relatively abandoned. At least I'll leave you here witha traceback, if it'll be of any use.

# Sphinx version: 4.5.0
# Python version: 3.10.8 (CPython)
# Docutils version: 0.17.1 release
# Jinja2 version: 3.1.2
# Last messages:

# Loaded extensions:
Traceback (most recent call last):
  File "C:\Users\asenkyrik\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\sphinx\cmd\build.py", line 272, in build_main
    app = Sphinx(args.sourcedir, args.confdir, args.outputdir,
  File "C:\Users\asenkyrik\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\sphinx\application.py", line 223, in __init__
    self.setup_extension(extension)
  File "C:\Users\asenkyrik\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\sphinx\application.py", line 380, in setup_extension
    self.registry.load_extension(self, extname)
  File "C:\Users\asenkyrik\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\sphinx\registry.py", line 425, in load_extension
    mod = import_module(extname)
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.10_3.10.2288.0_x64__qbz5n2kfra8p0\lib\importlib\__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 883, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "C:\Users\asenkyrik\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\sphinxcontrib\openapi\__init__.py", line 13, in <module>
    from sphinxcontrib.openapi import renderers, directive
  File "C:\Users\asenkyrik\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\sphinxcontrib\openapi\renderers\__init__.py", line 4, in <module>
    from ._httpdomain_old import HttpdomainOldRenderer
  File "C:\Users\asenkyrik\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\sphinxcontrib\openapi\renderers\_httpdomain_old.py", line 6, in <module>
    from .. import openapi20, openapi30, utils
  File "C:\Users\asenkyrik\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\sphinxcontrib\openapi\openapi20.py", line 16, in <module>
    from sphinxcontrib.openapi import utils
  File "C:\Users\asenkyrik\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\sphinxcontrib\openapi\utils.py", line 20, in <module>
    from m2r import convert as convert_markdown
  File "C:\Users\asenkyrik\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\m2r.py", line 59, in <module>
    class RestBlockGrammar(mistune.BlockGrammar):
AttributeError: module 'mistune' has no attribute 'BlockGrammar'

[phofl]

Hi, I created a fork and fixed the build issues (this is because of a newer mistune version). Ideally, I'd like to merge this here again, but I am using the fork for now, https://github.com/phofl/openapi