Don't hardcode the version (#353)

and add a `version` command that only prints the version (without the
build time)

Signed-off-by: Dimitris Karakasilis <dimitris@karakasilis.me>

cmd/root.go

@@ -30,8 +30,7 @@ var cfgFile string
 var Verbose bool
 
 const (
-	LuetCLIVersion = "0.34.0"
-	LuetEnvPrefix  = "LUET"
+	LuetEnvPrefix = "LUET"
 )
 
 var license = []string{
@@ -45,12 +44,12 @@ var license = []string{
 //
 // ⚠️ WARNING: should only be set by "-ldflags".
 var (
-	BuildTime   string
-	BuildCommit string
+	BuildTime string
+	Version   = "0.0.0"
 )
 
 func version() string {
-	return fmt.Sprintf("%s-g%s %s", LuetCLIVersion, BuildCommit, BuildTime)
+	return fmt.Sprintf("%s (Build time: %s)", Version, BuildTime)
 }
 
 // RootCmd represents the base command when called without any subcommands

cmd/version.go

@@ -0,0 +1,19 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+func init() {
+	RootCmd.AddCommand(versionCmd)
+}
+
+var versionCmd = &cobra.Command{
+	Use:   "version",
+	Short: "Print the version of luet",
+	Run: func(cmd *cobra.Command, args []string) {
+		fmt.Println(Version)
+	},
+}