mirror of https://github.com/chzyer/readline.git
314 lines
5.1 KiB
Go
314 lines
5.1 KiB
Go
package readline
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import (
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"bufio"
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"bytes"
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"container/list"
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"fmt"
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"os"
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"os/signal"
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"strconv"
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"strings"
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"sync"
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"syscall"
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"time"
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"unicode"
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)
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var (
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isWindows = false
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)
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const (
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CharLineStart = 1
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CharBackward = 2
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CharInterrupt = 3
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CharDelete = 4
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CharLineEnd = 5
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CharForward = 6
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CharBell = 7
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CharCtrlH = 8
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CharTab = 9
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CharCtrlJ = 10
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CharKill = 11
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CharCtrlL = 12
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CharEnter = 13
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CharNext = 14
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CharPrev = 16
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CharBckSearch = 18
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CharFwdSearch = 19
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CharTranspose = 20
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CharCtrlU = 21
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CharCtrlW = 23
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CharCtrlY = 25
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CharCtrlZ = 26
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CharEsc = 27
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CharO = 79
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CharEscapeEx = 91
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CharBackspace = 127
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CharK = 107
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CharJ = 106
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)
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const (
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MetaBackward rune = -iota - 1
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MetaForward
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MetaDelete
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MetaBackspace
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MetaTranspose
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)
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// WaitForResume need to call before current process got suspend.
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// It will run a ticker until a long duration is occurs,
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// which means this process is resumed.
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func WaitForResume() chan struct{} {
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ch := make(chan struct{})
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var wg sync.WaitGroup
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wg.Add(1)
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go func() {
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ticker := time.NewTicker(10 * time.Millisecond)
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t := time.Now()
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wg.Done()
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for {
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now := <-ticker.C
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if now.Sub(t) > 100*time.Millisecond {
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break
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}
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t = now
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}
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ticker.Stop()
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ch <- struct{}{}
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}()
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wg.Wait()
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return ch
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}
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func Restore(fd int, state *State) error {
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err := restoreTerm(fd, state)
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if err != nil {
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// errno 0 means everything is ok :)
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if err.Error() == "errno 0" {
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return nil
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} else {
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return err
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}
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}
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return nil
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}
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func IsPrintable(key rune) bool {
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isInSurrogateArea := key >= 0xd800 && key <= 0xdbff
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return key >= 32 && !isInSurrogateArea
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}
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// translate Esc[X
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func escapeExKey(key *escapeKeyPair) rune {
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var r rune
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switch key.typ {
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case 'D':
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r = CharBackward
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case 'C':
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r = CharForward
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case 'A':
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r = CharPrev
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case 'B':
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r = CharNext
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case 'H':
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r = CharLineStart
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case 'F':
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r = CharLineEnd
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case '~':
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if key.attr == "3" {
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r = CharDelete
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}
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default:
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}
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return r
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}
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// translate EscOX SS3 codes for up/down/etc.
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func escapeSS3Key(key *escapeKeyPair) rune {
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var r rune
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switch key.typ {
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case 'D':
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r = CharBackward
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case 'C':
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r = CharForward
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case 'A':
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r = CharPrev
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case 'B':
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r = CharNext
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case 'H':
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r = CharLineStart
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case 'F':
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r = CharLineEnd
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default:
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}
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return r
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}
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type escapeKeyPair struct {
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attr string
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typ rune
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}
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func (e *escapeKeyPair) Get2() (int, int, bool) {
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sp := strings.Split(e.attr, ";")
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if len(sp) < 2 {
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return -1, -1, false
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}
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s1, err := strconv.Atoi(sp[0])
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if err != nil {
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return -1, -1, false
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}
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s2, err := strconv.Atoi(sp[1])
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if err != nil {
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return -1, -1, false
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}
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return s1, s2, true
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}
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func readEscKey(r rune, reader *bufio.Reader) *escapeKeyPair {
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p := escapeKeyPair{}
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buf := bytes.NewBuffer(nil)
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for {
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if r == ';' {
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} else if unicode.IsNumber(r) {
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} else {
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p.typ = r
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break
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}
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buf.WriteRune(r)
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r, _, _ = reader.ReadRune()
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}
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p.attr = buf.String()
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return &p
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}
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// translate EscX to Meta+X
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func escapeKey(r rune, reader *bufio.Reader) rune {
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switch r {
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case 'b':
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r = MetaBackward
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case 'f':
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r = MetaForward
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case 'd':
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r = MetaDelete
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case CharTranspose:
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r = MetaTranspose
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case CharBackspace:
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r = MetaBackspace
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case 'O':
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d, _, _ := reader.ReadRune()
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switch d {
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case 'H':
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r = CharLineStart
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case 'F':
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r = CharLineEnd
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default:
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reader.UnreadRune()
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}
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case CharEsc:
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}
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return r
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}
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func SplitByLine(start, screenWidth int, rs []rune) []string {
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var ret []string
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buf := bytes.NewBuffer(nil)
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currentWidth := start
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for _, r := range rs {
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w := runes.Width(r)
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currentWidth += w
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buf.WriteRune(r)
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if currentWidth >= screenWidth {
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ret = append(ret, buf.String())
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buf.Reset()
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currentWidth = 0
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}
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}
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ret = append(ret, buf.String())
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return ret
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}
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// calculate how many lines for N character
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func LineCount(screenWidth, w int) int {
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r := w / screenWidth
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if w%screenWidth != 0 {
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r++
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}
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return r
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}
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func IsWordBreak(i rune) bool {
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switch {
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case i >= 'a' && i <= 'z':
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case i >= 'A' && i <= 'Z':
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case i >= '0' && i <= '9':
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default:
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return true
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}
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return false
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}
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func GetInt(s []string, def int) int {
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if len(s) == 0 {
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return def
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}
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c, err := strconv.Atoi(s[0])
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if err != nil {
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return def
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}
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return c
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}
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type RawMode struct {
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state *State
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}
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func (r *RawMode) Enter() (err error) {
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r.state, err = MakeRaw(GetStdin())
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return err
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}
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func (r *RawMode) Exit() error {
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if r.state == nil {
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return nil
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}
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return Restore(GetStdin(), r.state)
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}
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// -----------------------------------------------------------------------------
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func sleep(n int) {
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Debug(n)
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time.Sleep(2000 * time.Millisecond)
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}
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// print a linked list to Debug()
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func debugList(l *list.List) {
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idx := 0
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for e := l.Front(); e != nil; e = e.Next() {
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Debug(idx, fmt.Sprintf("%+v", e.Value))
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idx++
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}
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}
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// append log info to another file
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func Debug(o ...interface{}) {
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f, _ := os.OpenFile("debug.tmp", os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
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fmt.Fprintln(f, o...)
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f.Close()
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}
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func CaptureExitSignal(f func()) {
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cSignal := make(chan os.Signal, 1)
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signal.Notify(cSignal, os.Interrupt, syscall.SIGTERM)
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go func() {
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for range cSignal {
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f()
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}
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}()
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}
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