[vim/vim] filetype: Groff files are not recognized (PR #18718)

Callum Andrew

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Nov 10, 2025, 6:12:10 PM (yesterday) Nov 10

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Problem: Groff files are not recognized
Solution: Add patterns for filetypes specific to groff

mom macros are written specifically for groff: https://www.schaffter.ca/mom/

You can view, comment on, or merge this pull request online at:

https://github.com/vim/vim/pull/18718

Commit Summary

9bec2bf filetype: Groff files are not recognized

File Changes

(2 files)

M runtime/filetype.vim (5)
M src/testdir/test_filetype.vim (3)

Patch Links:

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Christian Brabandt

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9:40 AM (11 hours ago) 9:40 AM

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chrisbra left a comment (vim/vim#18718)

Unless I am missing something, making *.mom now a groff filetype and no longer a nroff filetype is a backwards incompatible change. How does such a change affect users with regard to e.g. syntax highlighting?

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Callum Andrew

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8:31 PM (1 hour ago) 8:31 PM

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candrew66 left a comment (vim/vim#18718)

The change should be backwards compatible as GNU troff syntax in vim only adds additional syntax highlighting options to nroff. git grep nroff_is_groff should show all the differences, with the only removal affecting the ms macros (a different filetype).

For users, the file will probably just look better, with long request names beyond two characters (which mom nearly always uses) and comments beginning with \# being recognised.