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A programming language that I use lets me format comments and docstrings using markdown, and then export my code and documentation to PDF.

When I edit the file, though, Emacs doesn't see comments as markdown; just as plain boring text.

I would like to access the full power of markdown-mode when I edit comments, without giving up the nice features of my programming languages' major mode outside of comments. How can I do this?

(A similar problem would include using a Javadoc specific mode map and syntax highlighting inside of Javadoc comments, for example)

  • I'm open to better tagging; mmm-mode doesn't seem to exist – Clément Jun 22 '15 at 17:54
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You can use poporg for this. People mostly use it to edit comments in Org mode, but you can use whatever mode you want by setting poporg-edit-hook.

(remove-hook 'poporg-edit-hook 'org-mode)
(add-hook 'poporg-edit-hook 'markdown-mode)

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