heavim/cfg/99-modelines.vim

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" When a local configuration is in use and a file is being opened under the
" local configuration's directory, enable modelines locally. Only allow a
" single modeline.
function! <SID>CheckModelines()
if !exists( "g:vim_local_path" )
return
endif
let l:file_path = expand( '%:p' )
let l:vim_local_root = fnamemodify( g:vim_local_path , ':p:h:h' ) . '/'
let l:lvlr = len( l:vim_local_root )
if len( l:file_path ) <= l:lvlr
\ || l:file_path[0:(l:lvlr-1)] !=# l:vim_local_root
return
endif
setlocal modeline
endfunction
set modelines=1
au BufRead * call <SID>CheckModelines()