vendor: github.com/nsf/termbox-go and dependencies for rclone ncdu

vendor/github.com/nsf/termbox-go/_demos/interrupt.go

@@ -0,0 +1,69 @@
+package main
+
+import (
+	"fmt"
+	"github.com/nsf/termbox-go"
+	"time"
+)
+
+func tbPrint(x, y int, fg, bg termbox.Attribute, msg string) {
+	for _, c := range msg {
+		termbox.SetCell(x, y, c, fg, bg)
+		x++
+	}
+}
+
+func draw(i int) {
+	termbox.Clear(termbox.ColorDefault, termbox.ColorDefault)
+	defer termbox.Flush()
+
+	w, h := termbox.Size()
+	s := fmt.Sprintf("count = %d", i)
+
+	tbPrint((w/2)-(len(s)/2), h/2, termbox.ColorRed, termbox.ColorDefault, s)
+}
+
+func main() {
+	err := termbox.Init()
+	if err != nil {
+		panic(err)
+	}
+	termbox.SetInputMode(termbox.InputEsc)
+
+	go func() {
+		time.Sleep(5 * time.Second)
+		termbox.Interrupt()
+
+		// This should never run - the Interrupt(), above, should cause the event
+		// loop below to exit, which then exits the process.  If something goes
+		// wrong, this panic will trigger and show what happened.
+		time.Sleep(1 * time.Second)
+		panic("this should never run")
+	}()
+
+	var count int
+
+	draw(count)
+mainloop:
+	for {
+		switch ev := termbox.PollEvent(); ev.Type {
+		case termbox.EventKey:
+			if ev.Ch == '+' {
+				count++
+			} else if ev.Ch == '-' {
+				count--
+			}
+
+		case termbox.EventError:
+			panic(ev.Err)
+
+		case termbox.EventInterrupt:
+			break mainloop
+		}
+
+		draw(count)
+	}
+	termbox.Close()
+
+	fmt.Println("Finished")
+}