vim - Vimrc: check if unix command is installed -

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i have these in vimrc:

if has("autocmd") augroup misc     " jump last known position when reopening file     autocmd bufreadpost *         \ if line("'\"") > 1 && line("'\"") <= line("$") |         \   exe "normal! g`\"" |         \ endif augroup end  augroup ftoptions     autocmd!     autocmd filetype cpp,java setlocal commentstring=//\ %s     autocmd filetype markdown setlocal textwidth=78 formatprg=par\ -w78 augroup end

in markdown files i'd formatting using par. works well, warning if "par" not installed on system. i'm wondering if there's way check , set "formatprg=par\ -78" when par installed, otherwise use vim's default formatting.

i grateful suggestion.

if executable('par')   " stuff endif

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