Call gnu readline library, and mruby from golang

callc.go

package main

/*
#cgo CFLAGS: -I/Users/koji/work/mruby/mruby/include
#cgo LDFLAGS: libmyclib.a -lreadline /Users/koji/work/mruby/mruby/build/host/lib/libmruby.a
#include <stdio.h>
#include <stdlib.h>
#include "myclib.h"
#include <readline/readline.h>
#include <readline/history.h>
#include "mruby.h"
#include "mruby/proc.h"
*/
import "C"
import "unsafe"
import "fmt"

func Random() int {
	return int(C.random())
}

func Seed(i int) {
	C.srandom(C.uint(i))
}

func Sum(a int, b int) int {
	return int(C.sum(C.int(a),C.int(b)))
}

func main() {
	fmt.Printf("Hi callc.go\n")
	Seed(33);
	fmt.Printf("Hi ramdom = %v\n", Random())
	fmt.Printf("hi sum = %v\n", Sum(2,3))

	//mruby
	var mrb *C.mrb_state = C.mrb_open() 
	if mrb != nil {
		fmt.Println("mrb_open ok")
	}

	//try using GNU readline library
	C.using_history()

	for {
		cinput := C.readline(C.CString("> "))
		if cinput == nil {
			fmt.Println("nil")
			continue
		}
		input := C.GoString(cinput)
		C.add_history(cinput)
		C.free(unsafe.Pointer(cinput))

		if input == "exit" {
			break
		}

		fmt.Printf(" => %v\n", input)

	}
}