cli: add help and version global flags

Author: pymq

cli/cli.go

@@ -7,6 +7,8 @@ import (
 	"fmt"
 	"os"
 	"path"
+	"runtime"
+	"slices"
 	"strconv"
 	"strings"
 
@@ -53,8 +55,15 @@ func (a *Application) Run() {
 		return
 	} else if os.Args[1] == CliCommandName {
 		// ok, handle here below
+	} else if slices.Contains([]string{"-h", "--help"}, os.Args[1]) {
+		a.printGlobalHelp()
+		os.Exit(0)
+	} else if slices.Contains([]string{"-v", "--version"}, os.Args[1]) {
+		a.printVersion()
+		os.Exit(0)
 	} else {
-		a.logger.Fatalf("Unknown command '%s', try '%s cli -h' for info on cli commands or '%s' to start awl server", os.Args[1], binaryName, binaryName)
+		fmt.Printf("Unknown command '%s'. Use '%s -h' for help, or run '%s' to start the server\n", os.Args[1], binaryName, binaryName)
+		os.Exit(-1)
 	}
 
 	err := a.cliapp.Run(os.Args[1:])
@@ -65,6 +74,26 @@ func (a *Application) Run() {
 	os.Exit(0)
 }
 
+func (a *Application) printGlobalHelp() {
+	fmt.Printf(`Usage: %s <command>
+
+Run without a command to start the server.
+
+Flags:
+  -h, --help     Show context-sensitive help.
+  -v, --version  Show version.
+
+Commands:
+  cli    Command line interface for Anywherelan
+
+Run "%s <command> --help" for more information on a command.
+`, binaryName, binaryName)
+}
+
+func (a *Application) printVersion() {
+	fmt.Printf("Anywherelan version %s (%s %s-%s)\n", config.Version, runtime.Version(), runtime.GOOS, runtime.GOARCH)
+}
+
 func (a *Application) init() {
 	a.cliapp = &cli.App{
 		Name:     "awl",