vim frida codeblock builder

frida.vim

command! -nargs=+ FridaV call FridaV(<f-args>)
command! -nargs=+ Frida call Frida(<f-args>)

function! FridaV( ... )
    let class = split(a:1,"\\V.")
    let last = class[len(class)-1]
    let S = ":normal i"
    let S .= "\tvar %s = Java.use(\"%s\")\n"
    execute printf(S,last,a:1)
    call Frida(last,a:2,a:3) 
endfunction

function! Frida( ... )
    let params = ["a","b","c","d","e","f","g","h","j","g","h"]
    let cnt = a:3
    echo cnt
    if cnt   
	let prm = params[0]
        let c = 1
        while c < cnt
	    let prm .= ","
            let prm .= params[c]
            let c += 1
        endwhile
    endif

    let S = ":normal i"
    let S .= "\t%s.%s.implementation = function("
    if cnt
	    let S .= "%s"
    endif
    let S .= "){\n"
    if cnt
    	let S .= "var retval = this.%s(%s)\n" 
    else
    	let S .= "var retval = this.%s()\n" 
    endif
    let S .= "console.log(\"hooked %s\")\n"
    let S .= "console.log(\"hooked %s\ \" + retval)\n"
    let S .= "send(retval)\n"
    if cnt
        let S .= "console.log(\"hooked %s\",%s)\n"
    endif
    let S .= "return retval\n}"

    if cnt
        execute printf(S,a:1,a:2,prm,a:2,prm,a:2,a:2,a:2,prm)
    else
        execute printf(S,a:1,a:2,a:2,a:2,a:2)
    endif
endfunction