add --tag

argv.go

@@ -14,6 +14,7 @@ type args struct {
 	RepoPath string `arg:"--repo" default:"./"             help:"path to the .git repo"`
 	Hostname string `arg:"--hostname"                      help:"hostname to use"`
 	Refs     bool   `arg:"--refs"                          help:"list the git ref hashes"`
+	Tag      string `arg:"--tag"                           help:"what tag name to walk"`
 }
 
 func (args) Version() string {

main.go

@@ -38,7 +38,9 @@ func main() {
 
 	showtags(repo)
 	// v0.0.8
-	printCommitsForTag(repo, "v0.22.2")
+	if argv.Tag != "" {
+		printCommitsForTag(repo, argv.Tag)
+	}
 }
 
 // lists the files in the git repo