func main() {
flag.Parse()
log.SetFlags(0)
log.SetPrefix("--- FAIL: ")
if *DebugKey {
Lookup()
return
}
if *DebugWinSize {
win := term.DetectWinSize()
defer win.Close()
fmt.Println("[Resize the window: should print a number every time]")
for i := 0; i < 7; i++ {
select {
case <-win.Change:
fmt.Printf("%d ", i)
case <-time.After(13 * time.Second):
fmt.Print("\ntimed out\n")
return
}
}
return
}
if !*IsInteractive {
pr, pw = io.Pipe()
term.Input = pr
}
TestCharMode()
TestEchoMode()
if *IsInteractive {
TestPassword()
}
TestEditLine()
if *IsInteractive {
TestDetectSize()
}
}
func TestDetectSize() {
fmt.Print("\n=== RUN TestDetectSize\n")
ter, _ := term.New()
defer func() {
if err := ter.Restore(); err != nil {
log.Print(err)
}
}()
row, col, err := ter.GetSize()
if err != nil {
panic(err)
}
winSize := term.DetectWinSize()
fmt.Println("[Change the size of the terminal]")
// I want to finish the test.
go func() {
time.Sleep(10 * time.Second)
winSize.Change <- true
}()
<-winSize.Change
winSize.Close()
row2, col2, err := ter.GetSize()
if err != nil {
panic(err)
}
if row == row2 && col == col2 {
log.Print("the terminal size got the same value")
return
}
}
// Read reads charactes from input to write them to output, enabling line editing.
// The errors that could return are to indicate if Ctrl+D was pressed, and for
// both input/output errors.
func (ln *Line) Read() (line string, err error) {
var anotherLine []rune // For lines got from history.
var isHistoryUsed bool // If the history has been accessed.
var action keyAction
in := bufio.NewReader(term.Input) // Read input.
esc := make([]byte, 2) // For escape sequences.
extEsc := make([]byte, 3) // Extended escape sequences.
// Print the primary prompt.
if err = ln.Prompt(); err != nil {
return "", err
}
// == Detect change of window size.
winSize := term.DetectWinSize()
go func() {
for {
select {
case <-winSize.Change: // Wait for.
_, col, err := ln.ter.GetSize()
if err != nil {
ln.buf.columns = col
ln.buf.refresh()
}
}
}
}()
defer winSize.Close()
for ; ; action = 0 {
char, _, err := in.ReadRune()
if err != nil {
return "", inputError(err.Error())
}
_S:
switch char {
default:
if err = ln.buf.insertRune(char); err != nil {
return "", err
}
continue
case sys.K_RETURN:
line = ln.buf.toString()
if ln.useHistory {
ln.hist.Add(line)
}
if _, err = term.Output.Write(CRLF); err != nil {
return "", outputError(err.Error())
}
return strings.TrimSpace(line), nil
case sys.K_TAB:
// TODO: disabled by now
continue
case sys.K_BACK, sys.K_CTRL_H:
if err = ln.buf.deleteCharPrev(); err != nil {
return "", err
}
continue
case sys.K_CTRL_C:
if err = ln.buf.insertRunes(CtrlC); err != nil {
return "", err
}
if _, err = term.Output.Write(CRLF); err != nil {
return "", outputError(err.Error())
}
ChanCtrlC <- 1 //TODO: is really necessary?
if err = ln.Prompt(); err != nil {
return "", err
}
continue
case sys.K_CTRL_D:
if err = ln.buf.insertRunes(CtrlD); err != nil {
return "", err
}
if _, err = term.Output.Write(CRLF); err != nil {
return "", outputError(err.Error())
}
ln.Restore()
ChanCtrlD <- 1
return "", ErrCtrlD
// Escape sequence
case sys.K_ESCAPE: // Ctrl+[ ("\x1b" in hexadecimal, "033" in octal)
if _, err = in.Read(esc); err != nil {
return "", inputError(err.Error())
}
if esc[0] == 79 { // 'O'
switch esc[1] {
case 72: // Home: "\x1b O H"
action = _HOME
break _S
case 70: // End: "\x1b O F"
action = _END
break _S
}
}
if esc[0] == 91 { // '['
switch esc[1] {
case 65: // Up: "\x1b [ A"
if !ln.useHistory {
continue
}
action = _UP
break _S
case 66: // Down: "\x1b [ B"
if !ln.useHistory {
continue
}
action = _DOWN
break _S
case 68: // "\x1b [ D"
action = _LEFT
break _S
case 67: // "\x1b [ C"
action = _RIGHT
break _S
}
// Extended escape.
if esc[1] > 48 && esc[1] < 55 {
if _, err = in.Read(extEsc); err != nil {
return "", inputError(err.Error())
}
if extEsc[0] == 126 { // '~'
switch esc[1] {
//case 50: // Insert: "\x1b [ 2 ~"
case 51: // Delete: "\x1b [ 3 ~"
if err = ln.buf.deleteChar(); err != nil {
return "", err
}
continue
//case 53: // RePag: "\x1b [ 5 ~"
//case 54: // AvPag: "\x1b [ 6 ~"
}
}
if esc[1] == 49 && extEsc[0] == 59 && extEsc[1] == 53 { // "1;5"
switch extEsc[2] {
case 68: // Ctrl+left arrow: "\x1b [ 1 ; 5 D"
// move to last word
if err = ln.buf.wordBackward(); err != nil {
return "", err
}
continue
case 67: // Ctrl+right arrow: "\x1b [ 1 ; 5 C"
// move to next word
if err = ln.buf.wordForward(); err != nil {
return "", err
}
continue
}
}
}
}
continue
case sys.K_CTRL_T: // Swap actual character by the previous one.
if err = ln.buf.swap(); err != nil {
return "", err
}
continue
case sys.K_CTRL_L: // Clear screen.
if _, err = term.Output.Write(DelScreenToUpper); err != nil {
return "", err
}
if err = ln.Prompt(); err != nil {
return "", err
}
continue
case sys.K_CTRL_U: // Delete the whole line.
if err = ln.buf.deleteLine(); err != nil {
return "", err
}
if err = ln.Prompt(); err != nil {
return "", err
}
continue
case sys.K_CTRL_K: // Delete from current to end of line.
if err = ln.buf.deleteToRight(); err != nil {
return "", err
}
continue
case sys.K_CTRL_P: // Up
if !ln.useHistory {
continue
}
action = _UP
case sys.K_CTRL_N: // Down
if !ln.useHistory {
continue
}
action = _DOWN
case sys.K_CTRL_B: // Left
action = _LEFT
case sys.K_CTRL_F: // Right
action = _RIGHT
case sys.K_CTRL_A: // Start of line.
action = _HOME
case sys.K_CTRL_E: // End of line.
action = _END
}
switch action {
case _UP, _DOWN: // Up and down arrow: history
if action == _UP {
anotherLine, err = ln.hist.Prev()
} else {
anotherLine, err = ln.hist.Next()
}
if err != nil {
continue
}
// Update the current history entry before to overwrite it with
// the next one.
// TODO: it has to be removed before of to be saved the history
if !isHistoryUsed {
ln.hist.Add(ln.buf.toString())
}
isHistoryUsed = true
ln.buf.grow(len(anotherLine))
ln.buf.size = len(anotherLine) + ln.buf.promptLen
copy(ln.buf.data[ln.lenPS1:], anotherLine)
if err = ln.buf.refresh(); err != nil {
return "", err
}
continue
case _LEFT:
if _, err = ln.buf.backward(); err != nil {
return "", err
}
continue
case _RIGHT:
if _, err = ln.buf.forward(); err != nil {
return "", err
}
continue
case _HOME:
if err = ln.buf.start(); err != nil {
return "", err
}
continue
case _END:
if _, err = ln.buf.end(); err != nil {
return "", err
}
continue
}
}
}