gistfile1.vim

" Toggle Comment
augroup toggle_comment
    au FileType vim let b:comment_leader = '" '
    au FileType c,cpp,java let b:comment_leader = '// ' 
    au FileType sh,make,python let b:comment_leader = '# '
    au FileType text let b:comment_leader = '% '
augroup END
function! ToggleComment() range
    let cl = b:comment_leader;
    for linenr in range(a:firstline, a:lastline)
        let line = getline(linenr)
        if line =~? '^\s*' . cl
            execute linenr . 's/^\(\s*\)' . escape(cl, '/') . '/\1/'
        else
            execute linenr . 's/^\(\s*\)/\=submatch(1) . printf( "%s", cl)/'
        endif
    endfor