feat(cellbuf): add cellbuf example

examples/cellbuf/main.go

@@ -0,0 +1,93 @@
+package main
+
+import (
+	"log"
+	"os"
+	"runtime"
+
+	"github.com/charmbracelet/x/ansi"
+	"github.com/charmbracelet/x/cellbuf"
+	"github.com/charmbracelet/x/input"
+	"github.com/charmbracelet/x/term"
+)
+
+func main() {
+	w, h, err := term.GetSize(os.Stdout.Fd())
+	if err != nil {
+		log.Fatalf("getting terminal size: %v", err)
+	}
+
+	state, err := term.MakeRaw(os.Stdin.Fd())
+	if err != nil {
+		log.Fatalf("making raw: %v", err)
+	}
+
+	defer term.Restore(os.Stdin.Fd(), state)
+
+	drv, err := input.NewDriver(os.Stdin, os.Getenv("TERM"), 0)
+	if err != nil {
+		log.Fatalf("creating input driver: %v", err)
+	}
+
+	os.Stdout.WriteString(ansi.EnableAltScreenBuffer + ansi.EnableMouseCellMotion + ansi.EnableMouseSgrExt)
+	defer os.Stdout.WriteString(ansi.DisableMouseSgrExt + ansi.DisableMouseCellMotion + ansi.DisableAltScreenBuffer)
+
+	var buf cellbuf.Buffer
+	var style cellbuf.Style
+	style.Reverse(true)
+	x, y := (w/2)-8, h/2
+	buf.Resize(w, h)
+
+	reset(&buf, x, y)
+
+	if runtime.GOOS != "windows" {
+		// Listen for resize events
+		go listenForResize(func() {
+			updateWinsize(&buf)
+			reset(&buf, x, y)
+		})
+	}
+
+	for {
+		evs, err := drv.ReadEvents()
+		if err != nil {
+			log.Fatalf("reading events: %v", err)
+		}
+
+		for _, ev := range evs {
+			switch ev := ev.(type) {
+			case input.WindowSizeEvent:
+				updateWinsize(&buf)
+			case input.MouseClickEvent:
+				x, y = ev.X, ev.Y
+			case input.KeyPressEvent:
+				switch ev.String() {
+				case "ctrl+c", "q":
+					return
+				case "left":
+					x--
+				case "down":
+					y++
+				case "up":
+					y--
+				case "right":
+					x++
+				}
+			}
+		}
+
+		reset(&buf, x, y)
+	}
+}
+
+func reset(buf *cellbuf.Buffer, x, y int) {
+	buf.Fill(cellbuf.Cell{Content: "你", Width: 2}, nil)
+	buf.Paint(0, "\x1b[7m !Hello, world! \x1b[m", &cellbuf.Rectangle{X: x, Y: y, Width: 16, Height: 1})
+	os.Stdout.WriteString(ansi.SetCursorPosition(1, 1) + buf.Render())
+}
+
+func updateWinsize(buf *cellbuf.Buffer) (w, h int) {
+	w, h, _ = term.GetSize(os.Stdout.Fd())
+	buf.Resize(w, h)
+	return
+}

examples/cellbuf/winsize_other.go

@@ -0,0 +1,19 @@
+//go:build !windows
+// +build !windows
+
+package main
+
+import (
+	"os"
+	"os/signal"
+	"syscall"
+)
+
+func listenForResize(fn func()) {
+	sig := make(chan os.Signal, 1)
+	signal.Notify(sig, syscall.SIGWINCH)
+
+	for range sig {
+		fn()
+	}
+}

examples/cellbuf/winsize_windows.go

@@ -0,0 +1,6 @@
+//go:build windows
+// +build windows
+
+package main
+
+func listenForResize(func()) {}