Fix: --version formatting

src/go/pt-galera-log-explainer/main.go

@@ -12,13 +12,20 @@ import (
 	"github.com/rs/zerolog/log"
 )
 
-// ldflags
-var (
-	version string
-	commit  string
-	date    string
+const (
+	toolname = "pt-galera-log-explainer"
 )
 
+// We do not set anything here, these variables are defined by the Makefile
+var (
+	Build     string //nolint
+	GoVersion string //nolint
+	Version   string //nolint
+	Commit    string //nolint
+)
+
+var buildInfo = fmt.Sprintf("%s\nVersion %s\nBuild: %s using %s\nCommit: %s\n", toolname, Version, Build, GoVersion, Commit)
+
 var CLI struct {
 	NoColor          bool
 	Since            *time.Time      `help:"Only list events after this date, format: 2023-01-23T03:53:40Z (RFC3339)"`
@@ -28,33 +35,27 @@ var CLI struct {
 	ExcludeRegexes   []string        `help:"Remove regexes from analysis. List regexes using 'pt-galera-log-explainer regex-list'"`
 	MergeByDirectory bool            `help:"Instead of relying on identification, merge contexts and columns by base directory. Very useful when dealing with many small logs organized per directories."`
 
-	List      list       `cmd:""`
-	Whois     whois      `cmd:""`
-	Sed       sed        `cmd:""`
-	Ctx       ctx        `cmd:""`
-	RegexList regexList  `cmd:""`
-	Version   versioncmd `cmd:""`
-	Conflicts conflicts  `cmd:""`
+	List      list      `cmd:""`
+	Whois     whois     `cmd:""`
+	Sed       sed       `cmd:""`
+	Ctx       ctx       `cmd:""`
+	RegexList regexList `cmd:""`
+	Conflicts conflicts `cmd:""`
+
+	Version kong.VersionFlag
 
 	GrepCmd  string `help:"'grep' command path. Could need to be set to 'ggrep' for darwin systems" default:"grep"`
 	GrepArgs string `help:"'grep' arguments. perl regexp (-P) is necessary. -o will break the tool" default:"-P"`
 }
 
-type versioncmd struct{}
-
-func (v *versioncmd) Help() string {
-	return ""
-}
-func (v *versioncmd) Run() error {
-	fmt.Printf("version: %s, commit:%s, built at %s\n", version, commit, date)
-	return nil
-}
-
 func main() {
 	ctx := kong.Parse(&CLI,
-		kong.Name("pt-galera-log-explainer"),
+		kong.Name(toolname),
 		kong.Description("An utility to merge and help analyzing Galera logs"),
 		kong.UsageOnError(),
+		kong.Vars{
+			"version": buildInfo,
+		},
 	)
 
 	zerolog.TimeFieldFormat = zerolog.TimeFormatUnix