fzf/src/terminal.go

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package fzf
import (
"fmt"
C "github.com/junegunn/fzf/src/curses"
"github.com/junegunn/go-runewidth"
"os"
"regexp"
"sort"
"sync"
"time"
)
type Terminal struct {
prompt string
reverse bool
tac bool
cx int
cy int
offset int
yanked []rune
input []rune
multi bool
printQuery bool
count int
progress int
reading bool
list []*Item
selected map[*string]*string
reqBox *EventBox
eventBox *EventBox
mutex sync.Mutex
initFunc func()
suppress bool
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}
var _spinner []string = []string{`-`, `\`, `|`, `/`, `-`, `\`, `|`, `/`}
const (
REQ_PROMPT EventType = iota
REQ_INFO
REQ_LIST
REQ_REFRESH
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REQ_REDRAW
REQ_CLOSE
REQ_QUIT
)
const (
INITIAL_DELAY = 100 * time.Millisecond
SPINNER_DURATION = 200 * time.Millisecond
)
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func NewTerminal(opts *Options, eventBox *EventBox) *Terminal {
input := []rune(opts.Query)
return &Terminal{
prompt: opts.Prompt,
tac: opts.Sort == 0,
reverse: opts.Reverse,
cx: displayWidth(input),
cy: 0,
offset: 0,
yanked: []rune{},
input: input,
multi: opts.Multi,
printQuery: opts.PrintQuery,
list: []*Item{},
selected: make(map[*string]*string),
reqBox: NewEventBox(),
eventBox: eventBox,
mutex: sync.Mutex{},
suppress: true,
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initFunc: func() {
C.Init(opts.Color, opts.Color256, opts.Black, opts.Mouse)
}}
}
func (t *Terminal) Input() []rune {
t.mutex.Lock()
defer t.mutex.Unlock()
return copySlice(t.input)
}
func (t *Terminal) UpdateCount(cnt int, final bool) {
t.mutex.Lock()
t.count = cnt
t.reading = !final
t.mutex.Unlock()
t.reqBox.Set(REQ_INFO, nil)
if final {
t.reqBox.Set(REQ_REFRESH, nil)
}
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}
func (t *Terminal) UpdateProgress(progress float32) {
t.mutex.Lock()
t.progress = int(progress * 100)
t.mutex.Unlock()
t.reqBox.Set(REQ_INFO, nil)
}
func (t *Terminal) UpdateList(list []*Item) {
t.mutex.Lock()
t.progress = 100
t.list = list
t.mutex.Unlock()
t.reqBox.Set(REQ_INFO, nil)
t.reqBox.Set(REQ_LIST, nil)
}
func (t *Terminal) listIndex(y int) int {
if t.tac {
return len(t.list) - y - 1
} else {
return y
}
}
func (t *Terminal) output() {
if t.printQuery {
fmt.Println(string(t.input))
}
if len(t.selected) == 0 {
if len(t.list) > t.cy {
t.list[t.listIndex(t.cy)].Print()
}
} else {
for ptr, orig := range t.selected {
if orig != nil {
fmt.Println(*orig)
} else {
fmt.Println(*ptr)
}
}
}
}
func displayWidth(runes []rune) int {
l := 0
for _, r := range runes {
l += runewidth.RuneWidth(r)
}
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)
C.CPrint(C.COL_PROMPT, true, t.prompt)
C.CPrint(C.COL_NORMAL, true, string(t.input))
}
func (t *Terminal) printInfo() {
t.move(1, 0, true)
if t.reading {
duration := int64(SPINNER_DURATION)
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idx := (time.Now().UnixNano() % (duration * int64(len(_spinner)))) / duration
C.CPrint(C.COL_SPINNER, true, _spinner[idx])
}
t.move(1, 2, false)
output := fmt.Sprintf("%d/%d", len(t.list), t.count)
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)
}
C.CPrint(C.COL_INFO, false, output)
}
func (t *Terminal) printList() {
t.constrain()
maxy := maxItems()
count := len(t.list) - t.offset
for i := 0; i < maxy; i++ {
t.move(i+2, 0, true)
if i < count {
t.printItem(t.list[t.listIndex(i+t.offset)], i == t.cy-t.offset)
}
}
}
func (t *Terminal) printItem(item *Item, current bool) {
_, selected := t.selected[item.text]
if current {
C.CPrint(C.COL_CURSOR, true, ">")
if selected {
C.CPrint(C.COL_CURRENT, true, ">")
} else {
C.CPrint(C.COL_CURRENT, true, " ")
}
t.printHighlighted(item, true, C.COL_CURRENT, C.COL_CURRENT_MATCH)
} else {
C.CPrint(C.COL_CURSOR, true, " ")
if selected {
C.CPrint(C.COL_SELECTED, true, ">")
} else {
C.Print(" ")
}
t.printHighlighted(item, false, 0, C.COL_MATCH)
}
}
func trimRight(runes []rune, width int) ([]rune, int) {
currentWidth := displayWidth(runes)
trimmed := 0
for currentWidth > width && len(runes) > 0 {
sz := len(runes)
currentWidth -= runewidth.RuneWidth(runes[sz-1])
runes = runes[:sz-1]
trimmed += 1
}
return runes, trimmed
}
func trimLeft(runes []rune, width int) ([]rune, int) {
currentWidth := displayWidth(runes)
trimmed := 0
for currentWidth > width && len(runes) > 0 {
currentWidth -= runewidth.RuneWidth(runes[0])
runes = runes[1:]
trimmed += 1
}
return runes, trimmed
}
func (*Terminal) printHighlighted(item *Item, bold bool, col1 int, col2 int) {
maxe := 0
for _, offset := range item.offsets {
if offset[1] > maxe {
maxe = offset[1]
}
}
// Overflow
text := []rune(*item.text)
offsets := item.offsets
maxWidth := C.MaxX() - 3
fullWidth := displayWidth(text)
if fullWidth > maxWidth {
// 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 int
text, diff = trimLeft(text, maxWidth-2)
// Transform offsets
offsets = make([]Offset, len(item.offsets))
for idx, offset := range item.offsets {
b, e := offset[0], offset[1]
b += 2 - diff
e += 2 - diff
b = Max(b, 2)
if b < e {
offsets[idx] = Offset{b, e}
}
}
text = append([]rune(".."), text...)
}
}
sort.Sort(ByOrder(offsets))
index := 0
for _, offset := range offsets {
b := Max(index, offset[0])
e := Max(index, offset[1])
C.CPrint(col1, bold, string(text[index:b]))
C.CPrint(col2, bold, string(text[b:e]))
index = e
}
if index < len(text) {
C.CPrint(col1, bold, string(text[index:]))
}
}
func (t *Terminal) printAll() {
t.printList()
t.printInfo()
t.printPrompt()
}
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...)
}
func (t *Terminal) Loop() {
{ // Late initialization
t.mutex.Lock()
t.initFunc()
t.printPrompt()
t.placeCursor()
C.Refresh()
t.printInfo()
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t.mutex.Unlock()
go func() {
timer := time.NewTimer(INITIAL_DELAY)
<-timer.C
t.reqBox.Set(REQ_REFRESH, nil)
}()
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}
go func() {
for {
t.reqBox.Wait(func(events *Events) {
defer events.Clear()
t.mutex.Lock()
for req := range *events {
switch req {
case REQ_PROMPT:
t.printPrompt()
case REQ_INFO:
t.printInfo()
case REQ_LIST:
t.printList()
case REQ_REFRESH:
t.suppress = false
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case REQ_REDRAW:
C.Clear()
t.printAll()
case REQ_CLOSE:
C.Close()
t.output()
os.Exit(0)
case REQ_QUIT:
C.Close()
os.Exit(1)
}
}
t.placeCursor()
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t.mutex.Unlock()
})
t.refresh()
}
}()
looping := true
for looping {
event := C.GetChar()
t.mutex.Lock()
previousInput := t.input
events := []EventType{REQ_PROMPT}
toggle := func() {
item := t.list[t.listIndex(t.cy)]
if _, found := t.selected[item.text]; !found {
t.selected[item.text] = item.origText
} else {
delete(t.selected, item.text)
}
}
req := func(evts ...EventType) {
for _, event := range evts {
events = append(events, event)
if event == REQ_CLOSE || event == REQ_QUIT {
looping = false
}
}
}
switch event.Type {
case C.INVALID:
continue
case C.CTRL_A:
t.cx = 0
case C.CTRL_B:
if t.cx > 0 {
t.cx -= 1
}
case C.CTRL_C, C.CTRL_G, C.CTRL_Q, C.ESC:
req(REQ_QUIT)
case C.CTRL_D:
if !t.delChar() && t.cx == 0 {
req(REQ_QUIT)
}
case C.CTRL_E:
t.cx = len(t.input)
case C.CTRL_F:
if t.cx < len(t.input) {
t.cx += 1
}
case C.CTRL_H:
if t.cx > 0 {
t.input = append(t.input[:t.cx-1], t.input[t.cx:]...)
t.cx -= 1
}
case C.TAB:
if t.multi && len(t.list) > 0 {
toggle()
t.vmove(-1)
req(REQ_LIST, REQ_INFO)
}
case C.BTAB:
if t.multi && len(t.list) > 0 {
toggle()
t.vmove(1)
req(REQ_LIST, REQ_INFO)
}
case C.CTRL_J, C.CTRL_N:
t.vmove(-1)
req(REQ_LIST)
case C.CTRL_K, C.CTRL_P:
t.vmove(1)
req(REQ_LIST)
case C.CTRL_M:
req(REQ_CLOSE)
case C.CTRL_L:
req(REQ_REDRAW)
case C.CTRL_U:
if t.cx > 0 {
t.yanked = copySlice(t.input[:t.cx])
t.input = t.input[t.cx:]
t.cx = 0
}
case C.CTRL_W:
if t.cx > 0 {
t.rubout("\\s\\S")
}
case C.ALT_BS:
if t.cx > 0 {
t.rubout("[^[:alnum:]][[:alnum:]]")
}
case C.CTRL_Y:
t.input = append(append(t.input[:t.cx], t.yanked...), t.input[t.cx:]...)
t.cx += len(t.yanked)
case C.DEL:
t.delChar()
case C.PGUP:
t.vmove(maxItems() - 1)
req(REQ_LIST)
case C.PGDN:
t.vmove(-(maxItems() - 1))
req(REQ_LIST)
case C.ALT_B:
t.cx = findLastMatch("[^[:alnum:]][[:alnum:]]", string(t.input[:t.cx])) + 1
case C.ALT_F:
t.cx += findFirstMatch("[[:alnum:]][^[:alnum:]]|(.$)", string(t.input[t.cx:])) + 1
case C.ALT_D:
ncx := t.cx +
findFirstMatch("[[:alnum:]][^[:alnum:]]|(.$)", 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 C.RUNE:
prefix := copySlice(t.input[:t.cx])
t.input = append(append(prefix, event.Char), t.input[t.cx:]...)
t.cx += 1
case C.MOUSE:
me := event.MouseEvent
mx, my := Min(len(t.input), Max(0, me.X-len(t.prompt))), me.Y
if !t.reverse {
my = C.MaxY() - my - 1
}
if me.S != 0 {
// Scroll
if me.Mod {
toggle()
}
t.vmove(me.S)
req(REQ_LIST)
} else if me.Double {
// Double-click
if my >= 2 {
t.cy = my - 2
req(REQ_CLOSE)
}
} else if me.Down {
if my == 0 && mx >= 0 {
// Prompt
t.cx = mx
} else if my >= 2 {
// List
t.cy = t.offset + my - 2
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if me.Mod {
toggle()
}
req(REQ_LIST)
}
}
}
changed := string(previousInput) != string(t.input)
t.mutex.Unlock() // Must be unlocked before touching reqBox
if changed {
t.eventBox.Set(EVT_SEARCH_NEW, nil)
}
for _, event := range events {
t.reqBox.Set(event, nil)
}
}
}
func (t *Terminal) constrain() {
count := len(t.list)
height := C.MaxY() - 2
diffpos := t.cy - t.offset
t.cy = Max(0, Min(t.cy, count-1))
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 {
t.offset = Max(0, count-height)
t.cy = Max(0, Min(t.offset+diffpos, count-1))
}
}
func (t *Terminal) vmove(o int) {
if t.reverse {
t.cy -= o
} else {
t.cy += o
}
}
func maxItems() int {
return C.MaxY() - 2
}