init

main.go

@@ -0,0 +1,119 @@
+package main
+
+import (
+	"log"
+	"time"
+
+	"github.com/nsf/termbox-go"
+)
+
+func main() {
+	t := NewTB()
+	t.Run()
+}
+
+type TB struct {
+	viewX, viewY int
+	vcenter      int
+	hcenter      int
+
+	arms [][]rune
+	arm  int
+}
+
+func NewTB() *TB {
+	return &TB{
+		arms: [][]rune{
+			{'.', '.'},
+			{'.', '.'},
+			{'-', '-'},
+			{'\\', '/'},
+			{'\'', '/'},
+			{'\\', '/'},
+			{'\\', '\''},
+			{'-', '-'},
+		},
+	}
+}
+
+func (tb *TB) Run() {
+	err := termbox.Init()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	defer termbox.Close()
+
+	tb.viewX, tb.viewY = termbox.Size()
+	tb.vcenter = tb.viewY / 2.0
+	tb.hcenter = tb.viewX / 2.0
+
+	events := make(chan termbox.Event)
+	go func() {
+		for {
+			events <- termbox.PollEvent()
+		}
+	}()
+
+	termbox.HideCursor()
+
+	func() {
+
+		tick := time.Tick(200 * time.Millisecond)
+		for {
+			termbox.Clear(termbox.ColorBlack, termbox.ColorBlack)
+			tb.draw()
+			err := termbox.Flush()
+			if err != nil {
+				log.Fatal(err)
+			}
+
+			select {
+			case <-tick:
+			case event := <-events:
+				switch event.Type {
+				case termbox.EventKey:
+					switch event.Key {
+					case termbox.KeyCtrlZ, termbox.KeyCtrlC:
+						log.Printf("exiting ...")
+						return
+					}
+
+					switch event.Ch {
+					case 'q':
+						return
+					}
+
+				case termbox.EventResize:
+					tb.viewX, tb.viewY = event.Width, event.Height
+					tb.vcenter = tb.viewY / 2.0
+					tb.hcenter = tb.viewX / 2.0
+				case termbox.EventError:
+					log.Fatalf("Quitting because of termbox error: \n%s\n", event.Err)
+				}
+			}
+		}
+	}()
+}
+
+func (tb *TB) draw() {
+	termbox.SetCell(
+		tb.hcenter-1,
+		tb.vcenter,
+		tb.arms[tb.arm%len(tb.arms)][0],
+		termbox.ColorWhite|termbox.AttrBold, termbox.ColorBlack,
+	)
+	termbox.SetCell(
+		tb.hcenter,
+		tb.vcenter,
+		'o',
+		termbox.ColorWhite|termbox.AttrBold, termbox.ColorBlack,
+	)
+	termbox.SetCell(
+		tb.hcenter+1,
+		tb.vcenter,
+		tb.arms[tb.arm%len(tb.arms)][1],
+		termbox.ColorWhite|termbox.AttrBold, termbox.ColorBlack,
+	)
+	tb.arm += 1
+}