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package main
import (
"fmt"
"os"
"github.com/gdamore/tcell/v2"
"code.rocketnine.space/tslocum/cbind"
)
func main() {
tcell.SetEncodingFallback(tcell.EncodingFallbackASCII)
s, e := tcell.NewScreen()
if e != nil {
fmt.Fprintf(os.Stderr, "%v\n", e)
os.Exit(1)
}
if e = s.Init(); e != nil {
fmt.Fprintf(os.Stderr, "%v\n", e)
os.Exit(1)
}
quit := make(chan struct{})
quitApp := func(ev *tcell.EventKey) *tcell.EventKey {
quit <- struct{}{}
return nil
}
configuration := cbind.NewConfiguration()
configuration.SetKey(tcell.ModNone, tcell.KeyEscape, quitApp)
configuration.SetRune(tcell.ModCtrl, 'c', quitApp)
s.SetStyle(tcell.StyleDefault.
Foreground(tcell.ColorWhite).
Background(tcell.ColorBlack))
s.Clear()
go func() {
for {
ev := s.PollEvent()
switch ev := ev.(type) {
case *tcell.EventResize:
s.Sync()
case *tcell.EventKey:
s.SetStyle(tcell.StyleDefault.
Foreground(tcell.ColorWhite).
Background(tcell.ColorBlack))
s.Clear()
putln(s, 0, fmt.Sprintf("Event: %d %d %d", ev.Modifiers(), ev.Key(), ev.Rune()))
str, err := cbind.Encode(ev.Modifiers(), ev.Key(), ev.Rune())
if err != nil {
str = fmt.Sprintf("error: %s", err)
}
putln(s, 2, str)
mod, key, ch, err := cbind.Decode(str)
if err != nil {
putln(s, 4, err.Error())
} else {
putln(s, 4, fmt.Sprintf("Re-encoded as: %d %d %d", mod, key, ch))
}
configuration.Capture(ev)
s.Sync()
}
}
}()
s.Show()
<-quit
s.Fini()
}
// putln and puts functions are copied from the tcell unicode demo.
// Apache License, Version 2.0
func putln(s tcell.Screen, y int, str string) {
puts(s, tcell.StyleDefault, 0, y, str)
}
func puts(s tcell.Screen, style tcell.Style, x, y int, str string) {
i := 0
var deferred []rune
dwidth := 0
zwj := false
for _, r := range str {
if r == '\u200d' {
if len(deferred) == 0 {
deferred = append(deferred, ' ')
dwidth = 1
}
deferred = append(deferred, r)
zwj = true
continue
}
if zwj {
deferred = append(deferred, r)
zwj = false
continue
}
if len(deferred) != 0 {
s.SetContent(x+i, y, deferred[0], deferred[1:], style)
i += dwidth
}
deferred = nil
dwidth = 1
deferred = append(deferred, r)
}
if len(deferred) != 0 {
s.SetContent(x+i, y, deferred[0], deferred[1:], style)
i += dwidth
}
}
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