134 lines
2.8 KiB
Go
134 lines
2.8 KiB
Go
package widgets
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import (
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"github.com/gdamore/tcell"
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"github.com/mattn/go-runewidth"
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"git.sr.ht/~sircmpwn/aerc2/lib/ui"
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)
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// TODO: history
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// TODO: tab completion
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// TODO: scrolling
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type ExLine struct {
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command []rune
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commit func(cmd string)
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ctx *ui.Context
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cancel func()
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cells int
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index int
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scroll int
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onInvalidate func(d ui.Drawable)
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}
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func NewExLine(commit func(cmd string), cancel func()) *ExLine {
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return &ExLine{
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cancel: cancel,
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cells: -1,
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commit: commit,
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command: []rune{},
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}
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}
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func (ex *ExLine) OnInvalidate(onInvalidate func(d ui.Drawable)) {
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ex.onInvalidate = onInvalidate
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}
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func (ex *ExLine) Invalidate() {
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if ex.onInvalidate != nil {
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ex.onInvalidate(ex)
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}
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}
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func (ex *ExLine) Draw(ctx *ui.Context) {
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ex.ctx = ctx // gross
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ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', tcell.StyleDefault)
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ctx.Printf(0, 0, tcell.StyleDefault, ":%s", string(ex.command))
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cells := runewidth.StringWidth(string(ex.command[:ex.index]))
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if cells != ex.cells {
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ctx.SetCursor(cells+1, 0)
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}
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}
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func (ex *ExLine) insert(ch rune) {
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left := ex.command[:ex.index]
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right := ex.command[ex.index:]
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ex.command = append(left, append([]rune{ch}, right...)...)
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ex.index++
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ex.Invalidate()
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}
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func (ex *ExLine) deleteWord() {
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// TODO: Break on any of / " '
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if len(ex.command) == 0 {
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return
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}
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i := ex.index - 1
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if ex.command[i] == ' ' {
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i--
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}
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for ; i >= 0; i-- {
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if ex.command[i] == ' ' {
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break
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}
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}
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ex.command = append(ex.command[:i+1], ex.command[ex.index:]...)
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ex.index = i + 1
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ex.Invalidate()
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}
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func (ex *ExLine) deleteChar() {
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if len(ex.command) > 0 && ex.index != len(ex.command) {
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ex.command = append(ex.command[:ex.index], ex.command[ex.index+1:]...)
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ex.Invalidate()
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}
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}
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func (ex *ExLine) backspace() {
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if len(ex.command) > 0 && ex.index != 0 {
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ex.command = append(ex.command[:ex.index-1], ex.command[ex.index:]...)
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ex.index--
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ex.Invalidate()
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}
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}
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func (ex *ExLine) Event(event tcell.Event) bool {
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switch event := event.(type) {
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case *tcell.EventKey:
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switch event.Key() {
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case tcell.KeyBackspace, tcell.KeyBackspace2:
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ex.backspace()
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case tcell.KeyCtrlD, tcell.KeyDelete:
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ex.deleteChar()
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case tcell.KeyCtrlB, tcell.KeyLeft:
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if ex.index > 0 {
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ex.index--
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ex.Invalidate()
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}
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case tcell.KeyCtrlF, tcell.KeyRight:
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if ex.index < len(ex.command) {
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ex.index++
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ex.Invalidate()
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}
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case tcell.KeyCtrlA, tcell.KeyHome:
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ex.index = 0
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ex.Invalidate()
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case tcell.KeyCtrlE, tcell.KeyEnd:
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ex.index = len(ex.command)
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ex.Invalidate()
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case tcell.KeyCtrlW:
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ex.deleteWord()
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case tcell.KeyEnter:
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ex.ctx.HideCursor()
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ex.commit(string(ex.command))
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case tcell.KeyEsc, tcell.KeyCtrlC:
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ex.ctx.HideCursor()
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ex.cancel()
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case tcell.KeyRune:
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ex.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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