fix typo in Makefile

.gitignore

@@ -0,0 +1 @@
+tglistbot*

Makefile

@@ -0,0 +1,12 @@
+
+VERSION = $(shell git describe --tags --abbrev=0)
+
+build_release:
+	CGO_ENABLED=0 go build -buildmode=pie -ldflags "-X main.Version=$(VERSION)" -o tglistbot-$(VERSION)
+
+release_check:
+	go list -m go.balki.me/tglistbot@$(VERSION)
+
+clean:
+	rm -i tglistbot* || true
+

main.go

@@ -22,14 +22,24 @@ import (
 	"go.balki.me/tglistbot/glist"
 )
 
+// Version will be set from build commandline
+var Version string
 var apiToken string
 
+var usage string = `Telegram List bot
+Environment variables:
+TGLB_API_TOKEN (required): See https://core.telegram.org/bots#how-do-i-create-a-bot
+TGLB_PORT (default 28923): Set numerical port or unix//run/path.sock for unix socket
+TGLB_DATA_PATH (default .): Directory path where list data is stored
+`
+
 func main() {
 
 	apiToken = os.Getenv("TGLB_API_TOKEN")
 
 	if apiToken == "" {
-		log.Panicln("TG_API_TOKEN is empty")
+		log.Print(usage)
+		log.Panicln("TGLB_API_TOKEN is empty")
 	}
 
 	port, unixSocketPath := func() (int, string) {
@@ -61,7 +71,10 @@ func main() {
 
 	glist.DataPath = dataPath
 
-	commit := func() string {
+	version := func() string {
+		if Version != "" {
+			return Version
+		}
 		if bi, ok := debug.ReadBuildInfo(); ok {
 			for _, s := range bi.Settings {
 				if s.Key == "vcs.revision" {
@@ -79,7 +92,7 @@ func main() {
 		return fmt.Sprintf("port: %v", port)
 	}()
 
-	log.Printf("List bot (%s) starting with datapath: %q, %s\n", commit, dataPath, listeningOn)
+	log.Printf("List bot (%s) starting with datapath: %q, %s\n", version, dataPath, listeningOn)
 
 	var chats sync.Map
 	if err := loadData(dataPath, &chats); err != nil {