137 lines
2.3 KiB
Go
137 lines
2.3 KiB
Go
package main
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import (
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"bufio"
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"fmt"
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"os"
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"strings"
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"tildegit.org/sloum/lines/termios"
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)
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const (
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UpArrow rune = iota - 20
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DownArrow
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LeftArrow
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RightArrow
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Delete
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Home
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End
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PrintScreen
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PageUp
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PageDown
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Escape rune = 27
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NewLine rune = 10
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CarriageReturn rune = 13
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BackSpace rune = 127
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)
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func readKey() (rune, error) {
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reader := bufio.NewReader(os.Stdin)
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char, _, err := reader.ReadRune()
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if err != nil {
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return 0, err
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}
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avail := reader.Buffered()
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if char == Escape && avail > 0 {
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var b strings.Builder
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b.WriteRune(27)
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for ; avail > 0; avail-- {
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c, _, e := reader.ReadRune()
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if e != nil {
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break
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}
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b.WriteRune(c)
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}
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escSeq := b.String()
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switch true {
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case escSeq == "\033[A":
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char = UpArrow
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case escSeq == "\033[B":
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char = DownArrow
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case escSeq == "\033[C":
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char = RightArrow
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case escSeq == "\033[D":
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char = LeftArrow
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case escSeq == "\033[5~":
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char = PageUp
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case escSeq == "\033[6~":
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char = PageDown
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case IsHomeKey(escSeq):
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char = Home
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case IsEndKey(escSeq):
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char = End
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case escSeq == "\033[3~" || escSeq == "\033[P":
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char = Delete
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default:
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fmt.Printf("Odd sequence: %s\n", escSeq[1:])
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}
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}
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return char, nil
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}
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func IsHomeKey(seq string) bool {
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switch seq {
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case "\033[1~", "\033[7~", "\033[H", "\033OH":
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return true
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default:
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return false
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}
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}
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func IsEndKey(seq string) bool {
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switch seq {
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case "\033[4~", "\033[8~", "\033[F", "\033OF":
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return true
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default:
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return false
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}
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}
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func PrintKey(k rune) {
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switch true {
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case k == UpArrow:
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fmt.Println("UpArrow")
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case k == DownArrow:
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fmt.Println("DownArrow")
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case k == LeftArrow:
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fmt.Println("LeftArrow")
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case k == RightArrow:
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fmt.Println("RightArrow")
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case k == Escape:
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fmt.Println("Escape")
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case k == NewLine:
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fmt.Println("NewLine")
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case k == CarriageReturn:
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fmt.Println("CarriageReturn")
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case k == Delete:
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fmt.Println("Delete")
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case k == Home:
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fmt.Println("Home")
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case k == End:
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fmt.Println("End")
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case k == BackSpace:
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fmt.Println("BackSpace")
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default:
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fmt.Printf("%c (%d)\n", k, k)
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}
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}
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func main() {
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termios.SetCharMode()
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for {
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k, e := readKey()
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if e != nil {
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fmt.Println(e.Error())
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continue
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}
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PrintKey(k)
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if k == NewLine || k == CarriageReturn {
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break
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}
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}
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termios.Restore()
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}
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