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taking diff between two named files in vim
"diff between foo.txt and bar.txt found"

:edit file1.txt
 :vert diffsplit file2.txt

:tabedit file1.txt
 :vert diffsplit file2.txt

diffprogram | grep -w '^diff between' | grep 'found$' |
while read diff between file1 and file2 found;
do
    gvim -d "$file1" "$file2"
done

gvim --servername GVIM --remote-silent +"tabedit $file1" +"vert diffsplit $file2"

function s:OpenDiff()
    let line=getline('.')
    let match=matchlist(line, 'v^ {4}"diff between (.{-}) and (.{-}) found" $')[1:2]
    if empty(match)
        throw 'Incorrect line:' line
    endif
    execute 'tabedit'   fnameescape(match[0])
    execute 'diffsplit' fnameescape(match[1])
endfunction
nnoremap ,od :<C-u>call <SID>OpenDiff()<CR>