532 lines
11 KiB
Go
532 lines
11 KiB
Go
package ui
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import (
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"math"
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"strings"
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"sync"
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"time"
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"github.com/gdamore/tcell/v2"
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"github.com/mattn/go-runewidth"
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"git.sr.ht/~rjarry/aerc/config"
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"git.sr.ht/~rjarry/aerc/logging"
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)
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// TODO: Attach history providers
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// TODO: scrolling
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type TextInput struct {
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sync.Mutex
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cells int
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ctx *Context
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focus bool
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index int
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password bool
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prompt string
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scroll int
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text []rune
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change []func(ti *TextInput)
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focusLost []func(ti *TextInput)
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tabcomplete func(s string) ([]string, string)
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completions []string
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prefix string
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completeIndex int
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completeDelay time.Duration
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completeDebouncer *time.Timer
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uiConfig *config.UIConfig
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}
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// Creates a new TextInput. TextInputs will render a "textbox" in the entire
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// context they're given, and process keypresses to build a string from user
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// input.
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func NewTextInput(text string, ui *config.UIConfig) *TextInput {
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return &TextInput{
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cells: -1,
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text: []rune(text),
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index: len([]rune(text)),
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uiConfig: ui,
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}
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}
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func (ti *TextInput) Password(password bool) *TextInput {
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ti.password = password
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return ti
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}
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func (ti *TextInput) Prompt(prompt string) *TextInput {
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ti.prompt = prompt
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return ti
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}
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func (ti *TextInput) TabComplete(
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tabcomplete func(s string) ([]string, string), d time.Duration,
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) *TextInput {
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ti.tabcomplete = tabcomplete
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ti.completeDelay = d
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return ti
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}
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func (ti *TextInput) String() string {
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return string(ti.text)
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}
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func (ti *TextInput) StringLeft() string {
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for ti.index > len(ti.text) {
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ti.index = len(ti.text)
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}
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return string(ti.text[:ti.index])
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}
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func (ti *TextInput) StringRight() string {
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return string(ti.text[ti.index:])
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}
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func (ti *TextInput) Set(value string) *TextInput {
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ti.text = []rune(value)
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ti.index = len(ti.text)
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return ti
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}
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func (ti *TextInput) Invalidate() {
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Invalidate()
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}
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func (ti *TextInput) Draw(ctx *Context) {
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scroll := ti.scroll
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if !ti.focus {
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scroll = 0
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} else {
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ti.ensureScroll()
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}
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ti.ctx = ctx // gross
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defaultStyle := ti.uiConfig.GetStyle(config.STYLE_DEFAULT)
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ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', defaultStyle)
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text := ti.text[scroll:]
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sindex := ti.index - scroll
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if ti.password {
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x := ctx.Printf(0, 0, defaultStyle, "%s", ti.prompt)
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cells := runewidth.StringWidth(string(text))
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ctx.Fill(x, 0, cells, 1, '*', defaultStyle)
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} else {
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ctx.Printf(0, 0, defaultStyle, "%s%s", ti.prompt, string(text))
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}
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cells := runewidth.StringWidth(string(text[:sindex]) + ti.prompt)
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if ti.focus {
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ctx.SetCursor(cells, 0)
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ti.drawPopover(ctx)
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}
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}
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func (ti *TextInput) drawPopover(ctx *Context) {
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if len(ti.completions) == 0 {
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return
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}
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cmp := &completions{
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options: ti.completions,
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idx: ti.completeIndex,
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stringLeft: ti.StringLeft(),
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onSelect: func(idx int) {
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ti.completeIndex = idx
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ti.Invalidate()
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},
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onExec: func() {
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ti.executeCompletion()
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ti.invalidateCompletions()
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ti.Invalidate()
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},
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onStem: func(stem string) {
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ti.Set(ti.prefix + stem + ti.StringRight())
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ti.Invalidate()
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},
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uiConfig: ti.uiConfig,
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}
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width := maxLen(ti.completions) + 3
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height := len(ti.completions)
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ctx.Popover(0, 0, width, height, cmp)
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}
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func (ti *TextInput) MouseEvent(localX int, localY int, event tcell.Event) {
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if event, ok := event.(*tcell.EventMouse); ok {
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if event.Buttons() == tcell.Button1 {
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if localX >= len(ti.prompt)+1 && localX <= len(ti.text[ti.scroll:])+len(ti.prompt)+1 {
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ti.index = localX - len(ti.prompt) - 1
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ti.ensureScroll()
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ti.Invalidate()
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}
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}
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}
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}
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func (ti *TextInput) Focus(focus bool) {
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if ti.focus && !focus {
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ti.onFocusLost()
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}
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ti.focus = focus
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if focus && ti.ctx != nil {
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cells := runewidth.StringWidth(string(ti.text[:ti.index]))
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ti.ctx.SetCursor(cells+1, 0)
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} else if !focus && ti.ctx != nil {
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ti.ctx.HideCursor()
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}
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}
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func (ti *TextInput) ensureScroll() {
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if ti.ctx == nil {
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return
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}
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w := ti.ctx.Width() - len(ti.prompt)
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if ti.index >= ti.scroll+w {
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ti.scroll = ti.index - w + 1
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}
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if ti.index < ti.scroll {
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ti.scroll = ti.index
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}
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}
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func (ti *TextInput) insert(ch rune) {
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left := ti.text[:ti.index]
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right := ti.text[ti.index:]
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ti.text = append(left, append([]rune{ch}, right...)...) //nolint:gocritic // intentional append to different slice
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ti.index++
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ti.ensureScroll()
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ti.Invalidate()
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ti.onChange()
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}
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func (ti *TextInput) deleteWord() {
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if len(ti.text) == 0 || ti.index <= 0 {
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return
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}
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separators := "/'\""
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i := ti.index - 1
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for i >= 0 && ti.text[i] == ' ' {
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i--
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}
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if strings.ContainsRune(separators, ti.text[i]) {
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for i >= 0 && strings.ContainsRune(separators, ti.text[i]) {
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i--
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}
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} else {
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separators += " "
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for i >= 0 && !strings.ContainsRune(separators, ti.text[i]) {
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i--
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}
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}
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ti.text = append(ti.text[:i+1], ti.text[ti.index:]...)
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ti.index = i + 1
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ti.ensureScroll()
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ti.Invalidate()
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ti.onChange()
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}
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func (ti *TextInput) deleteLineForward() {
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if len(ti.text) == 0 || len(ti.text) == ti.index {
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return
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}
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ti.text = ti.text[:ti.index]
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ti.ensureScroll()
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ti.Invalidate()
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ti.onChange()
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}
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func (ti *TextInput) deleteLineBackward() {
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if len(ti.text) == 0 || ti.index == 0 {
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return
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}
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ti.text = ti.text[ti.index:]
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ti.index = 0
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ti.ensureScroll()
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ti.Invalidate()
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ti.onChange()
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}
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func (ti *TextInput) deleteChar() {
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if len(ti.text) > 0 && ti.index != len(ti.text) {
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ti.text = append(ti.text[:ti.index], ti.text[ti.index+1:]...)
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ti.ensureScroll()
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ti.Invalidate()
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ti.onChange()
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}
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}
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func (ti *TextInput) backspace() {
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if len(ti.text) > 0 && ti.index != 0 {
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ti.text = append(ti.text[:ti.index-1], ti.text[ti.index:]...)
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ti.index--
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ti.ensureScroll()
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ti.Invalidate()
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ti.onChange()
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}
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}
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func (ti *TextInput) executeCompletion() {
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if len(ti.completions) > 0 {
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ti.Set(ti.prefix + ti.completions[ti.completeIndex] + ti.StringRight())
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}
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}
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func (ti *TextInput) invalidateCompletions() {
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ti.completions = nil
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}
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func (ti *TextInput) onChange() {
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ti.updateCompletions()
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for _, change := range ti.change {
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change(ti)
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}
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}
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func (ti *TextInput) onFocusLost() {
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for _, focusLost := range ti.focusLost {
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focusLost(ti)
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}
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}
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func (ti *TextInput) updateCompletions() {
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if ti.tabcomplete == nil {
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// no completer
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return
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}
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if ti.completeDebouncer == nil {
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ti.completeDebouncer = time.AfterFunc(ti.completeDelay, func() {
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defer logging.PanicHandler()
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ti.Lock()
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ti.showCompletions()
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ti.Unlock()
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})
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} else {
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ti.completeDebouncer.Stop()
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ti.completeDebouncer.Reset(ti.completeDelay)
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}
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}
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func (ti *TextInput) showCompletions() {
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if ti.tabcomplete == nil {
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// no completer
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return
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}
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ti.completions, ti.prefix = ti.tabcomplete(ti.StringLeft())
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ti.completeIndex = -1
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ti.Invalidate()
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QueueRedraw()
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}
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func (ti *TextInput) OnChange(onChange func(ti *TextInput)) {
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ti.change = append(ti.change, onChange)
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}
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func (ti *TextInput) OnFocusLost(onFocusLost func(ti *TextInput)) {
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ti.focusLost = append(ti.focusLost, onFocusLost)
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}
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func (ti *TextInput) Event(event tcell.Event) bool {
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ti.Lock()
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defer ti.Unlock()
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if event, ok := event.(*tcell.EventKey); ok {
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switch event.Key() {
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case tcell.KeyBackspace, tcell.KeyBackspace2:
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ti.invalidateCompletions()
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ti.backspace()
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case tcell.KeyCtrlD, tcell.KeyDelete:
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ti.invalidateCompletions()
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ti.deleteChar()
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case tcell.KeyCtrlB, tcell.KeyLeft:
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ti.invalidateCompletions()
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if ti.index > 0 {
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ti.index--
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ti.ensureScroll()
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ti.Invalidate()
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}
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case tcell.KeyCtrlF, tcell.KeyRight:
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ti.invalidateCompletions()
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if ti.index < len(ti.text) {
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ti.index++
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ti.ensureScroll()
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ti.Invalidate()
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}
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case tcell.KeyCtrlA, tcell.KeyHome:
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ti.invalidateCompletions()
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ti.index = 0
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ti.ensureScroll()
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ti.Invalidate()
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case tcell.KeyCtrlE, tcell.KeyEnd:
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ti.invalidateCompletions()
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ti.index = len(ti.text)
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ti.ensureScroll()
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ti.Invalidate()
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case tcell.KeyCtrlK:
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ti.invalidateCompletions()
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ti.deleteLineForward()
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case tcell.KeyCtrlW:
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ti.invalidateCompletions()
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ti.deleteWord()
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case tcell.KeyCtrlU:
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ti.invalidateCompletions()
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ti.deleteLineBackward()
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case tcell.KeyESC:
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if ti.completions != nil {
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ti.invalidateCompletions()
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ti.Invalidate()
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}
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case tcell.KeyTab:
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ti.showCompletions()
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case tcell.KeyRune:
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ti.invalidateCompletions()
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ti.insert(event.Rune())
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}
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}
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return true
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}
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type completions struct {
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options []string
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stringLeft string
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idx int
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onSelect func(int)
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onExec func()
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onStem func(string)
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uiConfig *config.UIConfig
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}
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func maxLen(ss []string) int {
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max := 0
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for _, s := range ss {
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l := runewidth.StringWidth(s)
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if l > max {
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max = l
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}
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}
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return max
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}
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func (c *completions) Draw(ctx *Context) {
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bg := c.uiConfig.GetStyle(config.STYLE_COMPLETION_DEFAULT)
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gutter := c.uiConfig.GetStyle(config.STYLE_COMPLETION_GUTTER)
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pill := c.uiConfig.GetStyle(config.STYLE_COMPLETION_PILL)
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sel := c.uiConfig.GetStyleSelected(config.STYLE_COMPLETION_DEFAULT)
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ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', bg)
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numVisible := ctx.Height()
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startIdx := 0
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if len(c.options) > numVisible && c.idx+1 > numVisible {
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startIdx = c.idx - (numVisible - 1)
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}
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endIdx := startIdx + numVisible - 1
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for idx, opt := range c.options {
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if idx < startIdx {
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continue
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}
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if idx > endIdx {
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continue
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}
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if c.idx == idx {
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ctx.Fill(0, idx-startIdx, ctx.Width(), 1, ' ', sel)
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ctx.Printf(0, idx-startIdx, sel, " %s ", opt)
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} else {
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ctx.Printf(0, idx-startIdx, bg, " %s ", opt)
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}
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}
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percentVisible := float64(numVisible) / float64(len(c.options))
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if percentVisible >= 1.0 {
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return
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}
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// gutter
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ctx.Fill(ctx.Width()-1, 0, 1, ctx.Height(), ' ', gutter)
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pillSize := int(math.Ceil(float64(ctx.Height()) * percentVisible))
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percentScrolled := float64(startIdx) / float64(len(c.options))
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pillOffset := int(math.Floor(float64(ctx.Height()) * percentScrolled))
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ctx.Fill(ctx.Width()-1, pillOffset, 1, pillSize, ' ', pill)
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}
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func (c *completions) next() {
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idx := c.idx
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idx++
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if idx > len(c.options)-1 {
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idx = -1
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}
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c.onSelect(idx)
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}
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func (c *completions) prev() {
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idx := c.idx
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idx--
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if idx < -1 {
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idx = len(c.options) - 1
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}
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c.onSelect(idx)
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}
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func (c *completions) Event(e tcell.Event) bool {
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if e, ok := e.(*tcell.EventKey); ok {
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switch e.Key() {
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case tcell.KeyTab:
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if len(c.options) == 1 && c.idx >= 0 {
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c.onExec()
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} else {
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stem := findStem(c.options)
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if stem != "" && stem != c.stringLeft {
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c.onStem(stem)
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} else {
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c.next()
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}
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}
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return true
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case tcell.KeyCtrlN, tcell.KeyDown:
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c.next()
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return true
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case tcell.KeyBacktab, tcell.KeyCtrlP, tcell.KeyUp:
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c.prev()
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return true
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case tcell.KeyEnter:
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if c.idx >= 0 {
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c.onExec()
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return true
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}
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}
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}
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return false
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}
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func findStem(words []string) string {
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if len(words) == 0 {
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return ""
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}
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if len(words) == 1 {
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return words[0]
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}
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var stem string
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stemLen := 1
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firstWord := []rune(words[0])
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for {
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if len(firstWord) < stemLen {
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return stem
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}
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var r rune = firstWord[stemLen-1]
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for _, word := range words[1:] {
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runes := []rune(word)
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if len(runes) < stemLen {
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return stem
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}
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if runes[stemLen-1] != r {
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return stem
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}
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}
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stem += string(r)
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stemLen++
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}
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}
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func (c *completions) Focus(_ bool) {}
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func (c *completions) Invalidate() {}
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