package ui import ( tb "github.com/nsf/termbox-go" ) // TODO: history // TODO: tab completion // TODO: commit // TODO: cancel (via esc/ctrl+c) // TODO: scrolling type ExLine struct { command *string commit func(cmd *string) index int scroll int onInvalidate func(d Drawable) } func NewExLine() *ExLine { cmd := "" return &ExLine{command: &cmd} } func (ex *ExLine) OnInvalidate(onInvalidate func(d Drawable)) { ex.onInvalidate = onInvalidate } func (ex *ExLine) Invalidate() { if ex.onInvalidate != nil { ex.onInvalidate(ex) } } func (ex *ExLine) Draw(ctx *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", *ex.command) tb.SetCursor(ctx.X()+ex.index-ex.scroll+1, ctx.Y()) } func (ex *ExLine) insert(ch rune) { newCmd := (*ex.command)[:ex.index] + string(ch) + (*ex.command)[ex.index:] ex.command = &newCmd 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 } } newCmd := (*ex.command)[:i+1] + (*ex.command)[ex.index:] ex.command = &newCmd ex.index = i + 1 ex.Invalidate() } func (ex *ExLine) deleteChar() { if len(*ex.command) > 0 && ex.index != len(*ex.command) { newCmd := (*ex.command)[:ex.index] + (*ex.command)[ex.index+1:] ex.command = &newCmd ex.Invalidate() } } func (ex *ExLine) backspace() { if len(*ex.command) > 0 && ex.index != 0 { newCmd := (*ex.command)[:ex.index-1] + (*ex.command)[ex.index:] ex.command = &newCmd 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 }