fix(terminal): poll and wait termbox event so that we get the output …

…of termbox buffer. (yeqown#95)

Co-authored-by: Yeqown.Y <[email protected]>

writer/terminal/writer.go

@@ -3,6 +3,7 @@ package terminal
 import (
 	"github.com/yeqown/go-qrcode/v2"
 
+	"github.com/mattn/go-runewidth"
 	termbox "github.com/nsf/termbox-go"
 )
 
@@ -57,20 +58,50 @@ func (w Writer) Write(mat qrcode.Matrix) error {
 	bg := termbox.ColorWhite
 	fg := termbox.ColorBlack
 
-	padding := 1
+	padding, curRow := 1, 0
 	w.preDraw(ww, hh, padding, bg)
 	mat.Iterate(qrcode.IterDirection_ROW, func(x int, y int, state qrcode.QRValue) {
-
 		if state.IsSet() {
 			fg = termbox.ColorBlack
 		} else {
 			fg = termbox.ColorWhite
 		}
 
 		w.drawBlock(x, y, padding, fg, bg)
+		curRow = y
 	})
 
-	return termbox.Flush()
+	printTip(curRow + 2*padding + 1 + 1)
+	return hold()
+}
+
+func printTip(y int) {
+	tip := "Press any key to quit."
+	x := 0
+	for _, r := range tip {
+		w := runewidth.RuneWidth(r)
+		if w == 0 || (w == 2 && runewidth.IsAmbiguousWidth(r)) {
+			w = 1
+		}
+		termbox.SetCell(x, y, r, termbox.ColorDefault, termbox.ColorDefault)
+		x += w
+	}
+}
+
+func hold() error {
+	if err := termbox.Flush(); err != nil {
+		return err
+	}
+
+wait:
+	for {
+		switch ev := termbox.PollEvent(); ev.Type {
+		case termbox.EventKey:
+			break wait
+		}
+	}
+
+	return nil
 }
 
 func (w Writer) Close() error {