Rename binary to litestream; add replicate command

cmd/litestream/main.go

@@ -0,0 +1,68 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"strings"
+)
+
+// Build information.
+var (
+	Version = "(development build)"
+)
+
+func main() {
+	log.SetFlags(0)
+
+	m := NewMain()
+	if err := m.Run(context.Background(), os.Args[1:]); err == flag.ErrHelp {
+		os.Exit(1)
+	} else if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}
+
+type Main struct{}
+
+func NewMain() *Main {
+	return &Main{}
+}
+
+func (m *Main) Run(ctx context.Context, args []string) (err error) {
+	var cmd string
+	if len(args) > 0 {
+		cmd, args = args[0], args[1:]
+	}
+
+	switch cmd {
+	case "replicate":
+		return (&ReplicateCommand{}).Run(ctx, args)
+	case "version":
+		return (&VersionCommand{}).Run(ctx, args)
+	default:
+		if cmd == "" || cmd == "help" || strings.HasPrefix(cmd, "-") {
+			m.Usage()
+			return flag.ErrHelp
+		}
+		return fmt.Errorf("litestream %s: unknown command", cmd)
+	}
+}
+
+func (m *Main) Usage() {
+	fmt.Println(`
+litestream is a tool for replicating SQLite databases.
+
+Usage:
+
+	litestream <command> [arguments]
+
+The commands are:
+
+	replicate   runs a server to replicate databases
+	version     prints the version
+`[1:])
+}