Support UTF-8 encoding

[demberto]

SVGBob supports UTF-8 box drawing characters, which arguably look a lot better than what ASCII looks like in a (modern) text editor.

I think you need to explicitly add an encoding="utf-8" here:

svgbob/sphinxcontrib/svgbob/transform.py

Line 68 in ee7b0fb

with open(outfile, mode="w") as f:

based on the tracebox in the error log Sphinx created:

Traceback (most recent call last):
  File "venv\lib\site-packages\sphinx\cmd\build.py", line 277, in build_main
    app.build(args.force_all, filenames)
  File "venv\lib\site-packages\sphinx\application.py", line 349, in build
    self.builder.build_update()
  File "venv\lib\site-packages\sphinx\builders\__init__.py", line 301, in build_update
    self.build(to_build,
  File "venv\lib\site-packages\sphinx\builders\__init__.py", line 317, in build
    updated_docnames = set(self.read())
  File "venv\lib\site-packages\sphinx\builders\__init__.py", line 424, in read
    self._read_serial(docnames)
  File "venv\lib\site-packages\sphinx\builders\__init__.py", line 445, in _read_serial
    self.read_doc(docname)
  File "venv\lib\site-packages\sphinx\builders\__init__.py", line 498, in read_doc
    publisher.publish()
  File "venv\lib\site-packages\docutils\core.py", line 219, in publish
    self.apply_transforms()
  File "venv\lib\site-packages\docutils\core.py", line 200, in apply_transforms
    self.document.transformer.apply_transforms()
  File "venv\lib\site-packages\sphinx\transforms\__init__.py", line 80, in apply_transforms
    super().apply_transforms()
  File "venv\lib\site-packages\docutils\transforms\__init__.py", line 171, in apply_transforms
    transform.apply(**kwargs)
  File "venv\lib\site-packages\sphinxcontrib\svgbob\transform.py", line 45, in apply
    out = self.render(node, options)
  File "venv\lib\site-packages\sphinxcontrib\svgbob\transform.py", line 69, in render
    f.write(to_svg(node["code"], **options)) # type: ignore
  File "Python310\lib\encodings\cp1252.py", line 19, in encode
    return codecs.charmap_encode(input,self.errors,encoding_table)[0]
UnicodeEncodeError: 'charmap' codec can't encode character '\u2192' in position 2864: character maps to <undefined>

[althonos]

Hi @demberto , thanks for the heads-up. The new release should now support Unicode box characters, and I've added a unit test to explicitly check that as well.