feat(config): add Version, FullVersion

Author: muthukrishnan24

config/version.go

@@ -0,0 +1,57 @@
+package config
+
+import (
+	"fmt"
+	"runtime/debug"
+)
+
+// Build constants
+// all variables are set during build
+var (
+	version   string
+	commit    string
+	buildTime string
+)
+
+// Version returns short version number of the commitlint
+func Version() string {
+	return formShortVersion()
+}
+
+// FullVersion returns version number with hash and build time of the commitlint
+func FullVersion() string {
+	return formFullVersion()
+}
+
+func formShortVersion() string {
+	if buildTime != "" {
+		return version
+	}
+
+	info, ok := debug.ReadBuildInfo()
+	if !ok {
+		return "v0"
+	}
+	return info.Main.Version
+}
+
+func formFullVersion() string {
+	versionTmpl := "%s - built from %s on %s"
+
+	if buildTime != "" {
+		return fmt.Sprintf(versionTmpl, version, commit, buildTime)
+	}
+
+	info, ok := debug.ReadBuildInfo()
+	if !ok {
+		return fmt.Sprintf(versionTmpl, "master", "unknown", "unknown")
+	}
+
+	var commitInfo string
+	if info.Main.Sum == "" {
+		commitInfo = "(" + "checksum: unknown)"
+	} else {
+		commitInfo = "(" + "checksum: " + info.Main.Sum + ")"
+	}
+	return fmt.Sprintf(versionTmpl, info.Main.Version, commitInfo, "unknown")
+}