blob: 31c1fbb37af127902b1654f83f298862be1e4c48 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
package readline
/*
// IMPORTANT: choose one
#cgo LDFLAGS: -ledit
//#cgo LDFLAGS: -lreadline // NOTE: libreadline is GPL
// free()
#include <stdlib.h>
// readline()
#include <stdio.h> // FILE *
#include <readline/readline.h>
// add_history()
#include <readline/history.h>
*/
import "C"
import (
"errors"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
"unsafe"
)
var HISTORY_FILE = ".mal-history"
var history_path string
func loadHistory(filename string) error {
content, err := ioutil.ReadFile(history_path)
if err != nil {
return err
}
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))
}
return nil
}
func init() {
history_path = filepath.Join(os.Getenv("HOME"), HISTORY_FILE)
loadHistory(history_path)
}
func Readline(prompt string) (string, error) {
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
}
|
