Parse error for >>> prompt in code examples

Sphinx supports docs code examples with a prompt and output, as in the example from http://www.sphinx-doc.org/en/stable/markup/code.html

>>> 1 + 1
2

Such code blocks are present in most docs files in the projects I work on, and blacken-docs gives a “code block parse error” for those and I think skips them completely, so doesn’t work for me (and I think many other people / projects) at the moment.

There must be some code in sphinx to parse those out, and to syntax highlight the rest of the code, so it should be possible to import and use that part of sphinx and only process the code after stripping the >>> out.

[asottile]

I’m referring to the separate pygments lexer https://pygments.org/docs/lexers/#pygments.lexers.python.PythonConsoleLexer

[cdeil]

Another issue I found is that in the projects I work on (Python projects using Sphinx) many code examples start with :: instead of code-block:: python, and Sphinx will automatically process those as code blocks.

blacken-docs doesn’t seem to recognise those code blocks, i.e. doesn’t even try to process most code blocks.

So I guess now that I understand a bit better what blacken-docs does (use just regexes), my feature request here is more: please support Python sphinx docs better, by behaving more like Sphinx.