dyngrepprg.vim

" dyngrepprg - set "grepprg" to dynamically when inside a git repository
" Maintainer:  Andreas Louv <andreas@louv.dk>
" Date:        3 Aug 2018

augroup DynGrepPrg
  au!
  au DirChanged * call <SID>SetGrepPrg()
augroup END

function! s:SetGrepPrg()
  if system('git rev-parse --show-toplevel 2> /dev/null') !~ '^\s*$'
    set grepprg=git\ grep\ -n\ --column\ $*
  else
    set grepprg=grep\ -nH\ --exclude={\\*.o,tags}
                   \\ --exclude-dir={node_modules,.git}
                   \\ $*
  endif
endfunction

call s:SetGrepPrg()