I am figuring out a way to apply linting to a visual selection of code. For example:

enter image description here

I only want to lint run :ALEFix on that section of code, and not the 100s (or 1000s) of lines of other code in the file. My first thought was doing something like:

  • Copy the visual selection. y
  • Option a new file and paste that in. :vs tmp
  • Run :AleFix on that shortened file.
  • Copy-all: ggVG"*y
  • Close that file :q!
  • Do gv to re-highlight the visual selection at the start.
  • Paste in the copy-buffer p

What might be a better way to do that? And if the above seems like it might be the best way, what might be a clean function to do that with? (I'll try writing one myself as well...)

2 Answers 2


A little rough around the edges, but here is what I came up with (which I've tested and works for me):

function _AleVisualSelection()
    normal! gvy
    vs tmp
    ALEFix black
    normal! ggVG
    sleep 300m

vnoremap    0   <Esc>:call _AleVisualSelection()<CR>y:q!<CR>gvp

You can use Vim's built-in :h formatprg and :h gq for this.

You can set formatprg option to the fixer/formatter tool of choice, like:

:let &l:formatprg='some-program --some-flag'

Or with set syntax which requires escaping spaces:

:setlocal formatprg=some-program\ --some-flag

You may persist this setting in your vimrc, like:

augroup RangeFixer
  autocmd FileType python let &l:formatprg='some-program --some-flag'
augroup END

Or persist it in the appropriate ftplugin file (e.g. ~/.vim/ftplugin/python.vim or ~/.vim/after/ftplugin/python.vim), which removes the need for autocmds:

" ~/.vim/after/ftplugin/python.vim

let &l:formatprg='some-program --some-flag'

Once you have configured formatprg using one of above, then you can highlight the range you want to format, then press gq.

  • Or use gq<motion>/gq<text-object>
    – D. Ben Knoble
    Jul 14, 2023 at 15:21

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