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package readline
/*
// IMPORTANT: choose one
#cgo LDFLAGS: -ledit
//#cgo LDFLAGS: -lreadline // NOTE: libreadline is GPL
// free()
#include <stdlib.h>
// readline()
#include <readline/readline.h>
// add_history()
#include <readline/history.h>
*/
import "C"
import (
"errors"
"unsafe"
"strings"
"io/ioutil"
"os"
"path/filepath"
"fmt"
)
var HISTORY_FILE = ".mal-history"
var rl_history_loaded = false
func Readline(prompt string) (string, error) {
history_path := filepath.Join(os.Getenv("HOME"), "/", HISTORY_FILE)
if !rl_history_loaded {
rl_history_loaded = true
content, e := ioutil.ReadFile(history_path)
if e != nil { return "", e }
for _, add_line := range strings.Split(string(content), "\n") {
if add_line == "" { continue }
c_add_line := C.CString(add_line)
C.add_history(c_add_line)
C.free(unsafe.Pointer(c_add_line))
}
}
c_prompt := C.CString(prompt)
defer C.free(unsafe.Pointer(c_prompt))
c_line := C.readline(c_prompt)
defer C.free(unsafe.Pointer(c_line))
line := C.GoString(c_line)
if c_line == nil {
return "", errors.New("C.readline call failed")
}
C.add_history(c_line)
// append to file
f, e := os.OpenFile(history_path, os.O_APPEND|os.O_WRONLY, 0600)
if e == nil {
defer f.Close()
_, e = f.WriteString(line+"\n")
if e != nil { fmt.Printf("error writing to history") }
}
return line, nil
}
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