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