ref: cdea6d3c7b2d9e5f2d1bf222d5b209ab84fd4da6
dir: /readline_plan9.go/
package main
import (
"bufio"
"fmt"
"io"
"os"
"strings"
)
// not relevant
const (
CharCtrlJ = 0
CharInterrupt = 0
CharEnter = 0
)
type readline struct {
config Config
multi bool
ctl *os.File
}
type Config struct {
Prompt string
//These are unused on Plan 9
FuncFilterInputRune func(rune) (rune, bool)
Listener func(line []rune, pos int, key rune) (newLine []rune, newPos int, ok bool)
}
func (rl *readline) GetConfig() *Config {
return &Config{Prompt: rl.config.Prompt}
}
func NewReadline(config *Config) (*readline, error) {
ctl, err := os.OpenFile("/dev/consctl", os.O_WRONLY, 0)
if err != nil {
return nil, err
}
return &readline{config: *config, ctl: ctl}, nil
}
func (rl *readline) ReadLineWithConfig(cfg *Config) (string, error) {
if rl.multi {
fmt.Print("MULTILINE ")
}
fmt.Print(cfg.Prompt)
var sb strings.Builder
var err error
var input string
for {
buffer := bufio.NewReader(os.Stdin)
input, err = buffer.ReadString('\n')
sb.WriteString(input)
if err != nil {
rl.multi = !rl.multi
if rl.multi {
fmt.Printf("MULTILINE %s", cfg.Prompt)
rl.ctl.WriteString("holdon")
continue
}
}
if !rl.multi {
break
}
}
return strings.TrimSpace(sb.String()), err
}
func (rl *readline) Stdout() io.Writer {
return os.Stdout
}
func (rl *readline) Close() {
return
}
func (rl *readline) SetPrompt(prompt string) {
rl.config.Prompt = prompt
}
func (rl *readline) SetDefault(editline string) {
rl.multi = true
rl.ctl.WriteString("holdon")
fmt.Printf("%s\n\n", editline)
}
func (rl *readline) Readline() (string, error) {
return rl.ReadLineWithConfig(&rl.config)
}
func enablePipeHack(rl *readline) {
}