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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
}
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