goreadline.go

// +build linux darwin

// sniped from https://github.com/rocaltair/goreadline
package golisp

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

func ReadLine(prompt *string) *string {
    var cPrompt *C.char
    if prompt != nil {
        cPrompt = C.CString(*prompt)
    }
    cLine := C.readline(cPrompt)
    if cPrompt != nil {
        C.free(unsafe.Pointer(cPrompt))
    }
    if cLine == nil {
        return nil
    }

    line := C.GoString(cLine)
    C.free(unsafe.Pointer(cLine))
    return &line
}

func AddHistory(line string) {
    cLine := C.CString(line)
    C.add_history(cLine)
    C.free(unsafe.Pointer(cLine))
}

func ClearHistory() {
    C.clear_history()
}

func WriteHistoryToFile(fileName string) {
    cFileName := C.CString(fileName)
    C.write_history(cFileName)
    C.free(unsafe.Pointer(cFileName))
}

func LoadHistoryFromFile(fileName string) {
    cFileName := C.CString(fileName)
    C.read_history(cFileName)
    C.free(unsafe.Pointer(cFileName))
}

func TruncateHistoryFile(fileName string, left int) {
    cFileName := C.CString(fileName)
    cLeft := C.int(left)
    C.history_truncate_file(cFileName, cLeft)
    C.free(unsafe.Pointer(cFileName))
}