Execute autocommand only if buffer contains a pattern

Question

Concrete example:
When using React with Styled Components, I want to load the CSS snippets file. I could achieve this with:
autocmd FileType javascript,typescript :UltiSnipsAddFiletypes css

However, I'd like to execute the command above only if styled-components is included in the current buffer.
Is this possible?

D. Ben Knoble · Answer

Put the check in a function so it’s not a mess:
function react#add_snips() abort
  if search('styled-components', 'nw') != 0
    UltiSnipsAddFiletypes css
  endif
endfunction

(This can go in ~/.vim/autoload/react.vim)
And then call the function:
augroup react
  autocmd!
  autocmd Filetype javascript,typescript call react#add_snips
augroup END

Alternatively, place the call portion in both ~/.vim/after/ftplugin/javascript.vim and ~/.vim/after/ftplugin/typescript.vim.

Execute autocommand only if buffer contains a pattern

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