package widgets import ( "github.com/mattn/go-runewidth" tb "github.com/nsf/termbox-go" "git.sr.ht/~sircmpwn/aerc2/lib/ui" ) // TODO: history // TODO: tab completion // TODO: commit // TODO: cancel (via esc/ctrl+c) // TODO: scrolling type ExLine struct { command []rune commit func(cmd *string) index int scroll int onInvalidate func(d ui.Drawable) } func NewExLine() *ExLine { return &ExLine{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) { cell := tb.Cell{ Fg: tb.ColorDefault, Bg: tb.ColorDefault, Ch: ' ', } ctx.Fill(0, 0, ctx.Width(), ctx.Height(), cell) ctx.Printf(0, 0, cell, ":%s", string(ex.command)) cells := runewidth.StringWidth(string(ex.command[:ex.index])) tb.SetCursor(ctx.X()+cells+1, ctx.Y()) } 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 tb.Event) bool { switch event.Type { case tb.EventKey: switch event.Key { case tb.KeySpace: ex.insert(' ') case tb.KeyBackspace, tb.KeyBackspace2: ex.backspace() case tb.KeyCtrlD, tb.KeyDelete: ex.deleteChar() case tb.KeyCtrlB, tb.KeyArrowLeft: if ex.index > 0 { ex.index-- ex.Invalidate() } case tb.KeyCtrlF, tb.KeyArrowRight: if ex.index < len(ex.command) { ex.index++ ex.Invalidate() } case tb.KeyCtrlA, tb.KeyHome: ex.index = 0 ex.Invalidate() case tb.KeyCtrlE, tb.KeyEnd: ex.index = len(ex.command) ex.Invalidate() case tb.KeyCtrlW: ex.deleteWord() default: if event.Ch != 0 { ex.insert(event.Ch) } } } return true }