augroup IndentFinder au! IndentFinder au BufRead *.* let b:indent_finder_result = system('python -c "import indent_finder; indent_finder.main()" --vim-output "' . expand('%') . '"' ) au BufRead *.* execute b:indent_finder_result " Uncomment the next line to see which indentation is applied on all your loaded files " au BufRead *.* echo "Indent Finder: " . b:indent_finder_result augroup End