fzf/src/terminal.go

1042 lines
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Go
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package fzf
import (
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"bytes"
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"fmt"
"os"
"os/exec"
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"os/signal"
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"regexp"
"sort"
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"strings"
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"sync"
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"syscall"
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"time"
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C "github.com/junegunn/fzf/src/curses"
"github.com/junegunn/fzf/src/util"
"github.com/junegunn/go-runewidth"
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)
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// Terminal represents terminal input/output
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type Terminal struct {
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inlineInfo bool
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prompt string
reverse bool
hscroll bool
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cx int
cy int
offset int
yanked []rune
input []rune
multi bool
sort bool
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toggleSort bool
expect map[int]string
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keymap map[int]actionType
execmap map[int]string
pressed string
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printQuery bool
history *History
cycle bool
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header []string
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count int
progress int
reading bool
merger *Merger
selected map[uint32]selectedItem
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reqBox *util.EventBox
eventBox *util.EventBox
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mutex sync.Mutex
initFunc func()
suppress bool
startChan chan bool
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}
type selectedItem struct {
at time.Time
text *string
}
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type byTimeOrder []selectedItem
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func (a byTimeOrder) Len() int {
return len(a)
}
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func (a byTimeOrder) Swap(i, j int) {
a[i], a[j] = a[j], a[i]
}
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func (a byTimeOrder) Less(i, j int) bool {
return a[i].at.Before(a[j].at)
}
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var _spinner = []string{`-`, `\`, `|`, `/`, `-`, `\`, `|`, `/`}
var _runeWidths = make(map[rune]int)
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const (
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reqPrompt util.EventType = iota
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reqInfo
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reqHeader
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reqList
reqRefresh
reqRedraw
reqClose
reqQuit
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)
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type actionType int
const (
actIgnore actionType = iota
actInvalid
actRune
actMouse
actBeginningOfLine
actAbort
actAccept
actBackwardChar
actBackwardDeleteChar
actBackwardWord
actClearScreen
actDeleteChar
actEndOfLine
actEof
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actForwardChar
actForwardWord
actKillLine
actKillWord
actUnixLineDiscard
actUnixWordRubout
actYank
actBackwardKillWord
actSelectAll
actDeselectAll
actToggle
actToggleAll
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actToggleDown
actToggleUp
actDown
actUp
actPageUp
actPageDown
actToggleSort
actPreviousHistory
actNextHistory
actExecute
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)
func defaultKeymap() map[int]actionType {
keymap := make(map[int]actionType)
keymap[C.Invalid] = actInvalid
keymap[C.CtrlA] = actBeginningOfLine
keymap[C.CtrlB] = actBackwardChar
keymap[C.CtrlC] = actAbort
keymap[C.CtrlG] = actAbort
keymap[C.CtrlQ] = actAbort
keymap[C.ESC] = actAbort
keymap[C.CtrlD] = actDeleteChar
keymap[C.CtrlE] = actEndOfLine
keymap[C.CtrlF] = actForwardChar
keymap[C.CtrlH] = actBackwardDeleteChar
keymap[C.BSpace] = actBackwardDeleteChar
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keymap[C.Tab] = actToggleDown
keymap[C.BTab] = actToggleUp
keymap[C.CtrlJ] = actDown
keymap[C.CtrlK] = actUp
keymap[C.CtrlL] = actClearScreen
keymap[C.CtrlM] = actAccept
keymap[C.CtrlN] = actDown
keymap[C.CtrlP] = actUp
keymap[C.CtrlU] = actUnixLineDiscard
keymap[C.CtrlW] = actUnixWordRubout
keymap[C.CtrlY] = actYank
keymap[C.AltB] = actBackwardWord
keymap[C.SLeft] = actBackwardWord
keymap[C.AltF] = actForwardWord
keymap[C.SRight] = actForwardWord
keymap[C.AltD] = actKillWord
keymap[C.AltBS] = actBackwardKillWord
keymap[C.Up] = actUp
keymap[C.Down] = actDown
keymap[C.Left] = actBackwardChar
keymap[C.Right] = actForwardChar
keymap[C.Home] = actBeginningOfLine
keymap[C.End] = actEndOfLine
keymap[C.Del] = actDeleteChar // FIXME Del vs. CTRL-D
keymap[C.PgUp] = actPageUp
keymap[C.PgDn] = actPageDown
keymap[C.Rune] = actRune
keymap[C.Mouse] = actMouse
return keymap
}
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// NewTerminal returns new Terminal object
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func NewTerminal(opts *Options, eventBox *util.EventBox) *Terminal {
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input := []rune(opts.Query)
return &Terminal{
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inlineInfo: opts.InlineInfo,
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prompt: opts.Prompt,
reverse: opts.Reverse,
hscroll: opts.Hscroll,
cx: len(input),
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cy: 0,
offset: 0,
yanked: []rune{},
input: input,
multi: opts.Multi,
sort: opts.Sort > 0,
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toggleSort: opts.ToggleSort,
expect: opts.Expect,
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keymap: opts.Keymap,
execmap: opts.Execmap,
pressed: "",
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printQuery: opts.PrintQuery,
history: opts.History,
cycle: opts.Cycle,
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header: opts.Header,
reading: true,
merger: EmptyMerger,
selected: make(map[uint32]selectedItem),
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reqBox: util.NewEventBox(),
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eventBox: eventBox,
mutex: sync.Mutex{},
suppress: true,
startChan: make(chan bool, 1),
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initFunc: func() {
C.Init(opts.Theme, opts.Black, opts.Mouse)
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}}
}
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// Input returns current query string
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func (t *Terminal) Input() []rune {
t.mutex.Lock()
defer t.mutex.Unlock()
return copySlice(t.input)
}
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// UpdateCount updates the count information
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func (t *Terminal) UpdateCount(cnt int, final bool) {
t.mutex.Lock()
t.count = cnt
t.reading = !final
t.mutex.Unlock()
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t.reqBox.Set(reqInfo, nil)
if final {
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t.reqBox.Set(reqRefresh, nil)
}
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}
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// UpdateHeader updates the header
func (t *Terminal) UpdateHeader(header []string, lines int) {
t.mutex.Lock()
t.header = make([]string, lines)
copy(t.header, header)
if !t.reverse {
reversed := make([]string, lines)
for idx, str := range t.header {
reversed[lines-idx-1] = str
}
t.header = reversed
}
t.mutex.Unlock()
t.reqBox.Set(reqHeader, nil)
}
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// UpdateProgress updates the search progress
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func (t *Terminal) UpdateProgress(progress float32) {
t.mutex.Lock()
newProgress := int(progress * 100)
changed := t.progress != newProgress
t.progress = newProgress
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t.mutex.Unlock()
if changed {
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t.reqBox.Set(reqInfo, nil)
}
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}
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// UpdateList updates Merger to display the list
func (t *Terminal) UpdateList(merger *Merger) {
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t.mutex.Lock()
t.progress = 100
t.merger = merger
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t.mutex.Unlock()
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t.reqBox.Set(reqInfo, nil)
t.reqBox.Set(reqList, nil)
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}
func (t *Terminal) output() {
if t.printQuery {
fmt.Println(string(t.input))
}
if len(t.expect) > 0 {
fmt.Println(t.pressed)
}
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if len(t.selected) == 0 {
cnt := t.merger.Length()
if cnt > 0 && cnt > t.cy {
fmt.Println(t.merger.Get(t.cy).AsString())
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}
} else {
sels := make([]selectedItem, 0, len(t.selected))
for _, sel := range t.selected {
sels = append(sels, sel)
}
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sort.Sort(byTimeOrder(sels))
for _, sel := range sels {
fmt.Println(*sel.text)
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}
}
}
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func runeWidth(r rune, prefixWidth int) int {
if r == '\t' {
return 8 - prefixWidth%8
} else if w, found := _runeWidths[r]; found {
return w
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} else {
w := runewidth.RuneWidth(r)
_runeWidths[r] = w
return w
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}
}
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func displayWidth(runes []rune) int {
l := 0
for _, r := range runes {
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l += runeWidth(r, l)
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}
return l
}
func (t *Terminal) move(y int, x int, clear bool) {
maxy := C.MaxY()
if !t.reverse {
y = maxy - y - 1
}
if clear {
C.MoveAndClear(y, x)
} else {
C.Move(y, x)
}
}
func (t *Terminal) placeCursor() {
t.move(0, len(t.prompt)+displayWidth(t.input[:t.cx]), false)
}
func (t *Terminal) printPrompt() {
t.move(0, 0, true)
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C.CPrint(C.ColPrompt, true, t.prompt)
C.CPrint(C.ColNormal, true, string(t.input))
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}
func (t *Terminal) printInfo() {
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if t.inlineInfo {
t.move(0, len(t.prompt)+displayWidth(t.input)+1, true)
if t.reading {
C.CPrint(C.ColSpinner, true, " < ")
} else {
C.CPrint(C.ColPrompt, true, " < ")
}
} else {
t.move(1, 0, true)
if t.reading {
duration := int64(spinnerDuration)
idx := (time.Now().UnixNano() % (duration * int64(len(_spinner)))) / duration
C.CPrint(C.ColSpinner, true, _spinner[idx])
}
t.move(1, 2, false)
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}
output := fmt.Sprintf("%d/%d", t.merger.Length(), t.count)
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if t.toggleSort {
if t.sort {
output += "/S"
} else {
output += " "
}
}
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if t.multi && len(t.selected) > 0 {
output += fmt.Sprintf(" (%d)", len(t.selected))
}
if t.progress > 0 && t.progress < 100 {
output += fmt.Sprintf(" (%d%%)", t.progress)
}
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C.CPrint(C.ColInfo, false, output)
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}
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func (t *Terminal) printHeader() {
if len(t.header) == 0 {
return
}
max := C.MaxY()
var state *ansiState
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for idx, lineStr := range t.header {
if !t.reverse {
idx = len(t.header) - idx - 1
}
line := idx + 2
if t.inlineInfo {
line -= 1
}
if line >= max {
continue
}
trimmed, colors, newState := extractColor(&lineStr, state)
state = newState
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item := &Item{
text: trimmed,
index: 0,
colors: colors,
rank: Rank{0, 0, 0}}
t.move(line, 2, true)
t.printHighlighted(item, false, C.ColHeader, 0, false)
}
}
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func (t *Terminal) printList() {
t.constrain()
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maxy := t.maxItems()
count := t.merger.Length() - t.offset
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for i := 0; i < maxy; i++ {
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line := i + 2 + len(t.header)
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if t.inlineInfo {
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line -= 1
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}
t.move(line, 0, true)
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if i < count {
t.printItem(t.merger.Get(i+t.offset), i == t.cy-t.offset)
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}
}
}
func (t *Terminal) printItem(item *Item, current bool) {
_, selected := t.selected[item.index]
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if current {
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C.CPrint(C.ColCursor, true, ">")
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if selected {
C.CPrint(C.ColSelected, true, ">")
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} else {
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C.CPrint(C.ColCurrent, true, " ")
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}
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t.printHighlighted(item, true, C.ColCurrent, C.ColCurrentMatch, true)
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} else {
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C.CPrint(C.ColCursor, true, " ")
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if selected {
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C.CPrint(C.ColSelected, true, ">")
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} else {
C.Print(" ")
}
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t.printHighlighted(item, false, 0, C.ColMatch, false)
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}
}
func trimRight(runes []rune, width int) ([]rune, int) {
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// We start from the beginning to handle tab characters
l := 0
for idx, r := range runes {
l += runeWidth(r, l)
if idx > 0 && l > width {
return runes[:idx], len(runes) - idx
}
}
return runes, 0
}
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func displayWidthWithLimit(runes []rune, prefixWidth int, limit int) int {
l := 0
for _, r := range runes {
l += runeWidth(r, l+prefixWidth)
if l > limit {
// Early exit
return l
}
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}
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return l
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}
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func trimLeft(runes []rune, width int) ([]rune, int32) {
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currentWidth := displayWidth(runes)
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var trimmed int32
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for currentWidth > width && len(runes) > 0 {
runes = runes[1:]
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trimmed++
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currentWidth = displayWidthWithLimit(runes, 2, width)
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}
return runes, trimmed
}
func (t *Terminal) printHighlighted(item *Item, bold bool, col1 int, col2 int, current bool) {
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var maxe int32
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for _, offset := range item.offsets {
if offset[1] > maxe {
maxe = offset[1]
}
}
// Overflow
text := []rune(*item.text)
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offsets := item.colorOffsets(col2, bold, current)
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maxWidth := C.MaxX() - 3
fullWidth := displayWidth(text)
if fullWidth > maxWidth {
if t.hscroll {
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// Stri..
matchEndWidth := displayWidth(text[:maxe])
if matchEndWidth <= maxWidth-2 {
text, _ = trimRight(text, maxWidth-2)
text = append(text, []rune("..")...)
} else {
// Stri..
if matchEndWidth < fullWidth-2 {
text = append(text[:maxe], []rune("..")...)
}
// ..ri..
var diff int32
text, diff = trimLeft(text, maxWidth-2)
// Transform offsets
for idx, offset := range offsets {
b, e := offset.offset[0], offset.offset[1]
b += 2 - diff
e += 2 - diff
b = util.Max32(b, 2)
offsets[idx].offset[0] = b
offsets[idx].offset[1] = util.Max32(b, e)
}
text = append([]rune(".."), text...)
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}
} else {
text, _ = trimRight(text, maxWidth-2)
text = append(text, []rune("..")...)
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for idx, offset := range offsets {
offsets[idx].offset[0] = util.Min32(offset.offset[0], int32(maxWidth-2))
offsets[idx].offset[1] = util.Min32(offset.offset[1], int32(maxWidth))
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}
}
}
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var index int32
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var substr string
var prefixWidth int
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maxOffset := int32(len(text))
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for _, offset := range offsets {
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b := util.Constrain32(offset.offset[0], index, maxOffset)
e := util.Constrain32(offset.offset[1], index, maxOffset)
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substr, prefixWidth = processTabs(text[index:b], prefixWidth)
C.CPrint(col1, bold, substr)
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if b < e {
substr, prefixWidth = processTabs(text[b:e], prefixWidth)
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C.CPrint(offset.color, offset.bold, substr)
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}
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index = e
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if index >= maxOffset {
break
}
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}
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if index < maxOffset {
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substr, _ = processTabs(text[index:], prefixWidth)
C.CPrint(col1, bold, substr)
}
}
func processTabs(runes []rune, prefixWidth int) (string, int) {
var strbuf bytes.Buffer
l := prefixWidth
for _, r := range runes {
w := runeWidth(r, l)
l += w
if r == '\t' {
strbuf.WriteString(strings.Repeat(" ", w))
} else {
strbuf.WriteRune(r)
}
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}
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return strbuf.String(), l
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}
func (t *Terminal) printAll() {
t.printList()
t.printPrompt()
t.printInfo()
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t.printHeader()
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}
func (t *Terminal) refresh() {
if !t.suppress {
C.Refresh()
}
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}
func (t *Terminal) delChar() bool {
if len(t.input) > 0 && t.cx < len(t.input) {
t.input = append(t.input[:t.cx], t.input[t.cx+1:]...)
return true
}
return false
}
func findLastMatch(pattern string, str string) int {
rx, err := regexp.Compile(pattern)
if err != nil {
return -1
}
locs := rx.FindAllStringIndex(str, -1)
if locs == nil {
return -1
}
return locs[len(locs)-1][0]
}
func findFirstMatch(pattern string, str string) int {
rx, err := regexp.Compile(pattern)
if err != nil {
return -1
}
loc := rx.FindStringIndex(str)
if loc == nil {
return -1
}
return loc[0]
}
func copySlice(slice []rune) []rune {
ret := make([]rune, len(slice))
copy(ret, slice)
return ret
}
func (t *Terminal) rubout(pattern string) {
pcx := t.cx
after := t.input[t.cx:]
t.cx = findLastMatch(pattern, string(t.input[:t.cx])) + 1
t.yanked = copySlice(t.input[t.cx:pcx])
t.input = append(t.input[:t.cx], after...)
}
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func keyMatch(key int, event C.Event) bool {
return event.Type == key || event.Type == C.Rune && int(event.Char) == key-C.AltZ
}
func executeCommand(template string, current string) {
command := strings.Replace(template, "{}", fmt.Sprintf("%q", current), -1)
cmd := exec.Command("sh", "-c", command)
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
C.Endwin()
cmd.Run()
C.Refresh()
}
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// Loop is called to start Terminal I/O
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func (t *Terminal) Loop() {
<-t.startChan
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{ // Late initialization
t.mutex.Lock()
t.initFunc()
t.printPrompt()
t.placeCursor()
C.Refresh()
t.printInfo()
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t.printHeader()
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t.mutex.Unlock()
go func() {
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timer := time.NewTimer(initialDelay)
<-timer.C
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t.reqBox.Set(reqRefresh, nil)
}()
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resizeChan := make(chan os.Signal, 1)
signal.Notify(resizeChan, syscall.SIGWINCH)
go func() {
for {
<-resizeChan
t.reqBox.Set(reqRedraw, 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)
}
}()
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}
exit := func(code int) {
if code == 0 && t.history != nil {
t.history.append(string(t.input))
}
os.Exit(code)
}
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go func() {
for {
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t.reqBox.Wait(func(events *util.Events) {
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defer events.Clear()
t.mutex.Lock()
for req := range *events {
switch req {
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case reqPrompt:
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t.printPrompt()
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if t.inlineInfo {
t.printInfo()
}
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case reqInfo:
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t.printInfo()
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case reqList:
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t.printList()
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case reqHeader:
t.printHeader()
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case reqRefresh:
t.suppress = false
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case reqRedraw:
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C.Clear()
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C.Endwin()
C.Refresh()
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t.printAll()
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case reqClose:
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C.Close()
t.output()
exit(0)
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case reqQuit:
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C.Close()
exit(1)
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}
}
t.placeCursor()
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t.mutex.Unlock()
})
t.refresh()
}
}()
looping := true
for looping {
event := C.GetChar()
t.mutex.Lock()
previousInput := t.input
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events := []util.EventType{reqPrompt}
req := func(evts ...util.EventType) {
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for _, event := range evts {
events = append(events, event)
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if event == reqClose || event == reqQuit {
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looping = false
}
}
}
selectItem := func(item *Item) bool {
if _, found := t.selected[item.index]; !found {
t.selected[item.index] = selectedItem{time.Now(), item.StringPtr()}
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)
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req(reqInfo)
}
}
for key, ret := range t.expect {
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if keyMatch(key, event) {
t.pressed = ret
req(reqClose)
break
}
}
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action := t.keymap[event.Type]
mapkey := event.Type
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if event.Type == C.Rune {
mapkey = int(event.Char) + int(C.AltZ)
if act, prs := t.keymap[mapkey]; prs {
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action = act
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}
}
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switch action {
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case actIgnore:
case actExecute:
if t.cy >= 0 && t.cy < t.merger.Length() {
item := t.merger.Get(t.cy)
executeCommand(t.execmap[mapkey], item.AsString())
}
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case actInvalid:
t.mutex.Unlock()
continue
case actToggleSort:
t.sort = !t.sort
t.eventBox.Set(EvtSearchNew, t.sort)
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t.mutex.Unlock()
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continue
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case actBeginningOfLine:
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t.cx = 0
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case actBackwardChar:
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if t.cx > 0 {
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t.cx--
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}
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case actAbort:
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req(reqQuit)
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case actDeleteChar:
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if !t.delChar() && t.cx == 0 {
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req(reqQuit)
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}
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case actEndOfLine:
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t.cx = len(t.input)
case actEof:
if len(t.input) == 0 {
req(reqQuit)
}
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case actForwardChar:
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if t.cx < len(t.input) {
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t.cx++
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}
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case actBackwardDeleteChar:
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if t.cx > 0 {
t.input = append(t.input[:t.cx-1], t.input[t.cx:]...)
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t.cx--
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}
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)
}
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case actToggleDown:
if t.multi && t.merger.Length() > 0 {
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toggle()
t.vmove(-1)
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req(reqList)
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}
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case actToggleUp:
if t.multi && t.merger.Length() > 0 {
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toggle()
t.vmove(1)
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req(reqList)
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}
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case actDown:
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t.vmove(-1)
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req(reqList)
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case actUp:
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t.vmove(1)
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req(reqList)
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case actAccept:
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req(reqClose)
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case actClearScreen:
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req(reqRedraw)
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case actUnixLineDiscard:
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if t.cx > 0 {
t.yanked = copySlice(t.input[:t.cx])
t.input = t.input[t.cx:]
t.cx = 0
}
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case actUnixWordRubout:
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if t.cx > 0 {
t.rubout("\\s\\S")
}
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case actBackwardKillWord:
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if t.cx > 0 {
t.rubout("[^[:alnum:]][[:alnum:]]")
}
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case actYank:
suffix := copySlice(t.input[t.cx:])
t.input = append(append(t.input[:t.cx], t.yanked...), suffix...)
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t.cx += len(t.yanked)
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case actPageUp:
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t.vmove(t.maxItems() - 1)
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req(reqList)
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case actPageDown:
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t.vmove(-(t.maxItems() - 1))
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req(reqList)
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case actBackwardWord:
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t.cx = findLastMatch("[^[:alnum:]][[:alnum:]]", string(t.input[:t.cx])) + 1
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case actForwardWord:
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t.cx += findFirstMatch("[[:alnum:]][^[:alnum:]]|(.$)", string(t.input[t.cx:])) + 1
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case actKillWord:
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ncx := t.cx +
findFirstMatch("[[:alnum:]][^[:alnum:]]|(.$)", 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:]...)
}
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case actKillLine:
if t.cx < len(t.input) {
t.yanked = copySlice(t.input[t.cx:])
t.input = t.input[:t.cx]
}
case actRune:
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prefix := copySlice(t.input[:t.cx])
t.input = append(append(prefix, event.Char), t.input[t.cx:]...)
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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)
}
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case actMouse:
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me := event.MouseEvent
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mx, my := util.Constrain(me.X-len(t.prompt), 0, len(t.input)), me.Y
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if !t.reverse {
my = C.MaxY() - my - 1
}
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min := 2 + len(t.header)
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if t.inlineInfo {
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min -= 1
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}
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if me.S != 0 {
// Scroll
if t.merger.Length() > 0 {
if t.multi && me.Mod {
toggle()
}
t.vmove(me.S)
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req(reqList)
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}
} else if me.Double {
// Double-click
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if my >= min {
if t.vset(t.offset+my-min) && t.cy < t.merger.Length() {
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req(reqClose)
}
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}
} else if me.Down {
if my == 0 && mx >= 0 {
// Prompt
t.cx = mx
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} else if my >= min {
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// List
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if t.vset(t.offset+my-min) && t.multi && me.Mod {
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toggle()
}
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req(reqList)
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}
}
}
changed := string(previousInput) != string(t.input)
t.mutex.Unlock() // Must be unlocked before touching reqBox
if changed {
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t.eventBox.Set(EvtSearchNew, t.sort)
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}
for _, event := range events {
t.reqBox.Set(event, nil)
}
}
}
func (t *Terminal) constrain() {
count := t.merger.Length()
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height := t.maxItems()
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diffpos := t.cy - t.offset
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t.cy = util.Constrain(t.cy, 0, count-1)
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if t.cy > t.offset+(height-1) {
// Ceil
t.offset = t.cy - (height - 1)
} else if t.offset > t.cy {
// Floor
t.offset = t.cy
}
// Adjustment
if count-t.offset < height {
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t.offset = util.Max(0, count-height)
t.cy = util.Constrain(t.offset+diffpos, 0, count-1)
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}
t.offset = util.Max(0, t.offset)
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}
func (t *Terminal) vmove(o int) {
if t.reverse {
o *= -1
}
dest := t.cy + o
if t.cycle {
max := t.merger.Length() - 1
if dest > max {
if t.cy == max {
dest = 0
}
} else if dest < 0 {
if t.cy == 0 {
dest = max
}
}
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}
t.vset(dest)
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}
func (t *Terminal) vset(o int) bool {
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t.cy = util.Constrain(o, 0, t.merger.Length()-1)
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return t.cy == o
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}
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func (t *Terminal) maxItems() int {
max := C.MaxY() - 2 - len(t.header)
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if t.inlineInfo {
max += 1
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}
return util.Max(max, 0)
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}