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haskellvimghc-mod

vim: call function on save

I am using ghc-mod in vim and would like GhcModCheck (:GhcModCheck) to be called every time I save a file (:w). Could you please tell me how I can achieve that? I guess there's a more general question: how can I invoke a function on save?

Thank you!

Solution

  • You can hook into the BufWritePost event. Globally (i.e. for every file):

    :autocmd BufWritePost * GhcModCheck

    To do this only for Haskell files, you could modify the file pattern:

    :autocmd BufWritePost *.hs GhcModCheck

    But it's better to leverage Vim's built-in filetype detection and instead put this into ~/.vim/ftplugin/haskell_OnSave.vim:

    :autocmd! BufWritePost <buffer> GhcModCheck