fix regression reading build info

main.go

@@ -3,7 +3,9 @@ package main
 
 import (
 	"context"
+	"log"
 	"os"
+	"runtime/debug"
 	"strings"
 
 	"github.com/charmbracelet/fang"
@@ -56,6 +58,14 @@ func init() {
 // main is the entry point of the application.
 // It executes the root command and handles any errors.
 func main() {
+	if version == "" {
+		info, ok := debug.ReadBuildInfo()
+		if !ok {
+			log.Fatal("could not read build info")
+		}
+		version = strings.Split(info.Main.Version, "-")[0]
+	}
+
 	if err := fang.Execute(context.Background(), rootCmd, fang.WithVersion(version)); err != nil {
 		os.Exit(1)
 	}