Allow rubocop auto-correct about haml-lint HOT 2 CLOSED

Thanks for the explanation, that sounds like a lot of trouble. Closing for now, as I'm very busy as well.

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Hey @felixbuenemann, thanks for the suggestion.

While I think this would be an awesome feature to have, the way haml-lint (and more specifically the HAML parser) is implemented makes it rather difficult to implement.

haml-lint integrates with rubocop by extracting Ruby code from a HAML document and creating a "fake" Ruby file to pass to rubocop. It then converts the line numbers reported by Rubocop to line numbers of the original HAML document (using a map generated during the extraction phase).

Running rubocop against this fake Ruby file with the --auto-correct flag, finding the differences, and trying to apply those differences back to the original HAML file, is a difficult problem, and will probably have a bunch of edge cases as the HAML parse tree does not have a 1-to-1 mapping to the original HAML source code IIRC (i.e. different HAML source files can correspond to the same parse tree, so a certain parse tree does not uniquely translate to a source file). That may not be a deal-breaker, but it certainly adds some complexity.

I would be open to a well-tested pull request if anyone wanted to tackle this, but I won't have the kind of time necessary to explore this particular feature myself.

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