Playing around a bit and getting the hang of tcell.

snake.go

@@ -1,8 +1,115 @@
 package main
 
-import "fmt"
+import (
+	"github.com/gdamore/tcell/v2"
+	"log"
+)
 
-func main() {
-	fmt.Println("Hello world!")
+func drawText(s tcell.Screen, x1, y1, x2, y2 int, style tcell.Style, text string) {
+	row := y1
+	col := x1
+	for _, r := range []rune(text) {
+		s.SetContent(col, row, r, nil, style)
+		col++
+		if col >= x2 {
+			row++
+			col = x1
+		}
+		if row > y2 {
+			break
+		}
+	}
 }
 
+func drawBox(s tcell.Screen, x1, y1, x2, y2 int, style tcell.Style, text string) {
+	if y2 < y1 {
+		y1, y2 = y2, y1
+	}
+	if x2 < x1 {
+		x1, x2 = x2, x1
+	}
+
+	// Fill background
+	for row := y1; row <= y2; row++ {
+		for col := x1; col <= x2; col++ {
+			s.SetContent(col, row, ' ', nil, style)
+		}
+	}
+
+	// Draw borders
+	for col := x1; col <= x2; col++ {
+		s.SetContent(col, y1, '═', nil, style)
+		s.SetContent(col, y2, '═', nil, style)
+	}
+	for row := y1 + 1; row < y2; row++ {
+		s.SetContent(x1, row, '║', nil, style)
+		s.SetContent(x2, row, '║', nil, style)
+	}
+
+	// Only draw corners if necessary
+	if y1 != y2 && x1 != x2 {
+		s.SetContent(x1, y1, '╔', nil, style)
+		s.SetContent(x2, y1, '╗', nil, style)
+		s.SetContent(x1, y2, '╚', nil, style)
+		s.SetContent(x2, y2, '╝', nil, style)
+	}
+
+	drawText(s, x1+1, y1+1, x2-1, y2-1, style, text)
+}
+
+func main() {
+	// info, err := tcell.LookupTerminfo(os.Getenv("TERM"))
+	defStyle := tcell.StyleDefault.Background(tcell.ColorReset).Foreground(tcell.ColorReset)
+	//boxStyle := tcell.StyleDefault.Foreground(tcell.ColorWhite).Background(tcell.ColorPurple)
+
+	var err error
+
+	screen, err := tcell.NewScreen()
+	if err != nil {
+		log.Println("Error creating screen: ", err)
+	}
+	err = screen.Init()
+	if err != nil {
+		log.Fatalln("Error initializing screen: ", err)
+	}
+
+	x, y := screen.Size()
+
+	screen.Clear()
+
+	drawBox(screen, 0, 0, x-1, y-1, defStyle, "There should be worms here!")
+
+	quit := func() {
+		// You have to catch panics in a defer, clean up, and
+		// re-raise them - otherwise your application can
+		// die without leaving any diagnostic trace.
+		maybePanic := recover()
+		screen.Fini()
+		if maybePanic != nil {
+			panic(maybePanic)
+		}
+	}
+	defer quit()
+
+	for {
+		screen.Show()
+		ev := screen.PollEvent()
+		switch ev := ev.(type) {
+		case *tcell.EventResize:
+			x, y := screen.Size()
+			drawBox(screen, 0, 0, x-1, y-1, defStyle, "There should be worms here!")
+			screen.Sync()
+		case *tcell.EventKey:
+			//fmt.Println("Key: ",ev.Rune())
+			if ev.Key() == tcell.KeyEscape || ev.Key() == tcell.KeyCtrlC {
+				return
+			} else if ev.Rune() == 'q' {
+				return
+			} else if ev.Key() == tcell.KeyCtrlL {
+				screen.Sync()
+			} else if ev.Rune() == 'C' || ev.Rune() == 'c' {
+				screen.Clear()
+			}
+		}
+	}
+}