path: root/ethereum/repl_darwin.go

package main

// #cgo LDFLAGS: -lreadline
// #include <stdio.h>
// #include <stdlib.h>
// #include <readline/readline.h>
// #include <readline/history.h>
import "C"
import "unsafe"

func readLine(prompt *string) *string {
    var p *C.char

    //readline allows an empty prompt(NULL)
    if prompt != nil {
        p = C.CString(*prompt)
    }

    ret := C.readline(p)

    if p != nil {
        C.free(unsafe.Pointer(p))
    }

    if ret == nil {
        return nil
    } //EOF

    s := C.GoString(ret)
    C.free(unsafe.Pointer(ret))
    return &s
}

func addHistory(s string) {
    p := C.CString(s)
    C.add_history(p)
    C.free(unsafe.Pointer(p))
}

func (self *JSRepl) read() {
    prompt := "eth >>> "

L:
    for {
        switch result := readLine(&prompt); true {
        case result == nil:
            break L //exit loop

        case *result != "": //ignore blank lines
            addHistory(*result) //allow user to recall this line

            self.parseInput(*result)
        }
    }
}