func (t *Terminal) calculateMargins() {
screenWidth := C.MaxX()
screenHeight := C.MaxY()
for idx, str := range t.margin {
if str == "0" {
t.marginInt[idx] = 0
} else if strings.HasSuffix(str, "%") {
num, _ := strconv.ParseFloat(str[:len(str)-1], 64)
var val float64
if idx%2 == 0 {
val = float64(screenHeight)
} else {
val = float64(screenWidth)
}
t.marginInt[idx] = int(val * num * 0.01)
} else {
num, _ := strconv.Atoi(str)
t.marginInt[idx] = num
}
}
adjust := func(idx1 int, idx2 int, max int, min int) {
if max >= min {
margin := t.marginInt[idx1] + t.marginInt[idx2]
if max-margin < min {
desired := max - min
t.marginInt[idx1] = desired * t.marginInt[idx1] / margin
t.marginInt[idx2] = desired * t.marginInt[idx2] / margin
}
}
}
adjust(1, 3, screenWidth, minWidth)
adjust(0, 2, screenHeight, minHeight)
}
func (t *Terminal) move(y int, x int, clear bool) {
x += t.marginInt[3]
maxy := C.MaxY()
if !t.reverse {
y = maxy - y - 1 - t.marginInt[2]
} else {
y += t.marginInt[0]
}
if clear {
C.MoveAndClear(y, x)
} else {
C.Move(y, x)
}
}
// Loop is called to start Terminal I/O
func (t *Terminal) Loop() {
<-t.startChan
{ // Late initialization
intChan := make(chan os.Signal, 1)
signal.Notify(intChan, os.Interrupt, os.Kill, syscall.SIGTERM)
go func() {
<-intChan
t.reqBox.Set(reqQuit, nil)
}()
resizeChan := make(chan os.Signal, 1)
signal.Notify(resizeChan, syscall.SIGWINCH)
go func() {
for {
<-resizeChan
t.reqBox.Set(reqRedraw, nil)
}
}()
t.mutex.Lock()
t.initFunc()
t.calculateMargins()
t.printPrompt()
t.placeCursor()
C.Refresh()
t.printInfo()
t.printHeader()
t.mutex.Unlock()
go func() {
timer := time.NewTimer(t.initDelay)
<-timer.C
t.reqBox.Set(reqRefresh, nil)
}()
// Keep the spinner spinning
go func() {
for {
t.mutex.Lock()
reading := t.reading
t.mutex.Unlock()
if !reading {
break
}
time.Sleep(spinnerDuration)
t.reqBox.Set(reqInfo, nil)
}
}()
}
exit := func(code int) {
if code <= exitNoMatch && t.history != nil {
t.history.append(string(t.input))
}
os.Exit(code)
}
go func() {
for {
t.reqBox.Wait(func(events *util.Events) {
defer events.Clear()
t.mutex.Lock()
for req := range *events {
switch req {
case reqPrompt:
t.printPrompt()
if t.inlineInfo {
t.printInfo()
}
case reqInfo:
t.printInfo()
case reqList:
t.printList()
case reqHeader:
t.printHeader()
case reqRefresh:
t.suppress = false
case reqRedraw:
C.Clear()
C.Endwin()
C.Refresh()
t.printAll()
case reqClose:
C.Close()
if t.output() {
exit(exitOk)
}
exit(exitNoMatch)
case reqQuit:
C.Close()
exit(exitInterrupt)
}
}
t.placeCursor()
t.mutex.Unlock()
})
t.refresh()
}
}()
looping := true
for looping {
event := C.GetChar()
t.mutex.Lock()
previousInput := t.input
events := []util.EventType{reqPrompt}
req := func(evts ...util.EventType) {
for _, event := range evts {
events = append(events, event)
if event == reqClose || event == reqQuit {
looping = false
}
}
}
selectItem := func(item *Item) bool {
if _, found := t.selected[item.Index()]; !found {
t.selected[item.Index()] = selectedItem{time.Now(), item.StringPtr(t.ansi)}
return true
}
return false
}
toggleY := func(y int) {
item := t.merger.Get(y)
if !selectItem(item) {
delete(t.selected, item.Index())
}
}
toggle := func() {
if t.cy < t.merger.Length() {
toggleY(t.cy)
req(reqInfo)
}
}
for key, ret := range t.expect {
if keyMatch(key, event) {
t.pressed = ret
req(reqClose)
break
}
}
var doAction func(actionType, int) bool
doAction = func(action actionType, mapkey int) bool {
switch action {
case actIgnore:
case actExecute:
if t.cy >= 0 && t.cy < t.merger.Length() {
item := t.merger.Get(t.cy)
executeCommand(t.execmap[mapkey], quoteEntry(item.AsString(t.ansi)))
}
case actExecuteMulti:
if len(t.selected) > 0 {
sels := make([]string, len(t.selected))
for i, sel := range t.sortSelected() {
sels[i] = quoteEntry(*sel.text)
}
executeCommand(t.execmap[mapkey], strings.Join(sels, " "))
} else {
return doAction(actExecute, mapkey)
}
case actInvalid:
t.mutex.Unlock()
return false
case actToggleSort:
t.sort = !t.sort
t.eventBox.Set(EvtSearchNew, t.sort)
t.mutex.Unlock()
return false
case actBeginningOfLine:
t.cx = 0
case actBackwardChar:
if t.cx > 0 {
t.cx--
}
case actAbort:
req(reqQuit)
case actDeleteChar:
t.delChar()
case actDeleteCharEOF:
if !t.delChar() && t.cx == 0 {
req(reqQuit)
}
case actEndOfLine:
t.cx = len(t.input)
case actCancel:
if len(t.input) == 0 {
req(reqQuit)
} else {
t.yanked = t.input
t.input = []rune{}
t.cx = 0
}
case actForwardChar:
if t.cx < len(t.input) {
t.cx++
}
case actBackwardDeleteChar:
if t.cx > 0 {
t.input = append(t.input[:t.cx-1], t.input[t.cx:]...)
t.cx--
}
case actSelectAll:
if t.multi {
for i := 0; i < t.merger.Length(); i++ {
item := t.merger.Get(i)
selectItem(item)
}
req(reqList, reqInfo)
}
case actDeselectAll:
if t.multi {
for i := 0; i < t.merger.Length(); i++ {
item := t.merger.Get(i)
delete(t.selected, item.Index())
}
req(reqList, reqInfo)
}
case actToggle:
if t.multi && t.merger.Length() > 0 {
toggle()
req(reqList)
}
case actToggleAll:
if t.multi {
for i := 0; i < t.merger.Length(); i++ {
toggleY(i)
}
req(reqList, reqInfo)
}
case actToggleIn:
if t.reverse {
return doAction(actToggleUp, mapkey)
}
return doAction(actToggleDown, mapkey)
case actToggleOut:
if t.reverse {
return doAction(actToggleDown, mapkey)
}
return doAction(actToggleUp, mapkey)
case actToggleDown:
if t.multi && t.merger.Length() > 0 {
toggle()
t.vmove(-1)
req(reqList)
}
case actToggleUp:
if t.multi && t.merger.Length() > 0 {
toggle()
t.vmove(1)
req(reqList)
}
case actDown:
t.vmove(-1)
req(reqList)
case actUp:
t.vmove(1)
req(reqList)
case actAccept:
req(reqClose)
case actClearScreen:
req(reqRedraw)
case actUnixLineDiscard:
if t.cx > 0 {
t.yanked = copySlice(t.input[:t.cx])
t.input = t.input[t.cx:]
t.cx = 0
}
case actUnixWordRubout:
if t.cx > 0 {
t.rubout("\\s\\S")
}
case actBackwardKillWord:
if t.cx > 0 {
t.rubout("[^[:alnum:]][[:alnum:]]")
}
case actYank:
suffix := copySlice(t.input[t.cx:])
t.input = append(append(t.input[:t.cx], t.yanked...), suffix...)
t.cx += len(t.yanked)
case actPageUp:
t.vmove(t.maxItems() - 1)
req(reqList)
case actPageDown:
t.vmove(-(t.maxItems() - 1))
req(reqList)
case actBackwardWord:
t.cx = findLastMatch("[^[:alnum:]][[:alnum:]]", string(t.input[:t.cx])) + 1
case actForwardWord:
t.cx += findFirstMatch("[[:alnum:]][^[:alnum:]]|(.$)", string(t.input[t.cx:])) + 1
case actKillWord:
ncx := t.cx +
findFirstMatch("[[:alnum:]][^[:alnum:]]|(.$)", string(t.input[t.cx:])) + 1
if ncx > t.cx {
t.yanked = copySlice(t.input[t.cx:ncx])
t.input = append(t.input[:t.cx], t.input[ncx:]...)
}
case actKillLine:
if t.cx < len(t.input) {
t.yanked = copySlice(t.input[t.cx:])
t.input = t.input[:t.cx]
}
case actRune:
prefix := copySlice(t.input[:t.cx])
t.input = append(append(prefix, event.Char), t.input[t.cx:]...)
t.cx++
case actPreviousHistory:
if t.history != nil {
t.history.override(string(t.input))
t.input = []rune(t.history.previous())
t.cx = len(t.input)
}
case actNextHistory:
if t.history != nil {
t.history.override(string(t.input))
t.input = []rune(t.history.next())
t.cx = len(t.input)
}
case actMouse:
me := event.MouseEvent
mx, my := me.X, me.Y
if me.S != 0 {
// Scroll
if t.merger.Length() > 0 {
if t.multi && me.Mod {
toggle()
}
t.vmove(me.S)
req(reqList)
}
} else if mx >= t.marginInt[3] && mx < C.MaxX()-t.marginInt[1] &&
my >= t.marginInt[0] && my < C.MaxY()-t.marginInt[2] {
mx -= t.marginInt[3]
my -= t.marginInt[0]
mx = util.Constrain(mx-displayWidth([]rune(t.prompt)), 0, len(t.input))
if !t.reverse {
my = t.maxHeight() - my - 1
}
min := 2 + len(t.header)
if t.inlineInfo {
min--
}
if me.Double {
// Double-click
if my >= min {
if t.vset(t.offset+my-min) && t.cy < t.merger.Length() {
return doAction(t.keymap[C.DoubleClick], C.DoubleClick)
}
}
} else if me.Down {
if my == 0 && mx >= 0 {
// Prompt
t.cx = mx
} else if my >= min {
// List
if t.vset(t.offset+my-min) && t.multi && me.Mod {
toggle()
}
req(reqList)
}
}
}
}
return true
}
action := t.keymap[event.Type]
mapkey := event.Type
if event.Type == C.Rune {
mapkey = int(event.Char) + int(C.AltZ)
if act, prs := t.keymap[mapkey]; prs {
action = act
}
}
if !doAction(action, mapkey) {
continue
}
changed := string(previousInput) != string(t.input)
t.mutex.Unlock() // Must be unlocked before touching reqBox
if changed {
t.eventBox.Set(EvtSearchNew, t.sort)
}
for _, event := range events {
t.reqBox.Set(event, nil)
}
}
}
func (t *Terminal) maxHeight() int {
return C.MaxY() - t.marginInt[0] - t.marginInt[2]
}