avisynth string formatting function

Colorbars(1920, 1080, "YV12")

function build_format_function(int arguments_count) {
    args_string = ""
    for(i = 1, arguments_count) {
        args_string = args_string + """, val "p""" + string(i) + """""""
    }

    Eval("""
    function format(string fmt""" + args_string + """) {
        for(i = 1, """ + string(arguments_count) + """) {
            try {
                value = string(eval("p" + string(i)))
                fmt = strreplace(fmt, "{"+string(i)+"}", value)
            } catch(ignored) {

            }
        }
        return fmt


        function strreplace(string haystack, string needle, string replace) {
            slen = strlen(needle)
            rlen = strlen(replace)
            olen = strlen(haystack)
            pos = findstr(haystack, needle)
            if (pos == 0) {
                return haystack
            }
            lstr = leftstr(haystack,pos-1)
            rstr = rightstr(haystack,olen-pos-slen+1)
            return lstr + replace + strreplace(rstr, needle, replace)
        }
    }
    """)
}

build_format_function(40)

Subtitle(format("{1}, this is an {2}: {3}", "Hey look", "int", 5))