Initial commit

cmd/billboard/main.go

@@ -0,0 +1,75 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+
+	"billboard/internal/server"
+	"billboard/internal/state"
+	"billboard/internal/tui"
+)
+
+func main() {
+	if len(os.Args) < 2 {
+		usage()
+		os.Exit(2)
+	}
+	switch os.Args[1] {
+	case "server":
+		serverCmd(os.Args[2:])
+	case "display":
+		displayCmd(os.Args[2:])
+	default:
+		usage()
+		os.Exit(2)
+	}
+}
+
+func usage() {
+	fmt.Fprintf(os.Stderr, `usage:
+  billboard server  [-addr :8080] [-width 64] [-height 32] [-snapshot billboard.json]
+  billboard display [-server http://localhost:8080] [-tty /dev/tty2]
+
+env:
+  BILLBOARD_TOKEN  if set on the server, POST requests need "Authorization: Bearer <token>"
+`)
+}
+
+func serverCmd(args []string) {
+	fs := flag.NewFlagSet("server", flag.ExitOnError)
+	addr := fs.String("addr", ":8080", "listen address")
+	width := fs.Int("width", 64, "canvas width in pixels")
+	height := fs.Int("height", 32, "canvas height in pixels")
+	snapshot := fs.String("snapshot", "billboard.json", "snapshot file (loaded if it exists)")
+	fs.Parse(args)
+
+	var st *state.State
+	if loaded, err := state.Load(*snapshot); err == nil {
+		st = loaded
+		fmt.Printf("loaded snapshot %s (%dx%d)\n", *snapshot, st.Width, st.Height)
+	} else {
+		st = state.New(*width, *height)
+	}
+
+	srv := server.New(st, server.Config{
+		Addr:         *addr,
+		Token:        os.Getenv("BILLBOARD_TOKEN"),
+		SnapshotPath: *snapshot,
+	})
+	if err := srv.Run(); err != nil {
+		fmt.Fprintln(os.Stderr, "server:", err)
+		os.Exit(1)
+	}
+}
+
+func displayCmd(args []string) {
+	fs := flag.NewFlagSet("display", flag.ExitOnError)
+	serverAddr := fs.String("server", "http://localhost:8080", "billboard server URL")
+	tty := fs.String("tty", "", "tty device to render on (e.g. /dev/tty2); default stdout")
+	fs.Parse(args)
+	if err := tui.Run(*serverAddr, *tty); err != nil {
+		fmt.Fprintln(os.Stderr, "display:", err)
+		os.Exit(1)
+	}
+}