Base application setup

Signed-off-by: Jan Tytgat <jan.tytgat@corelayer.eu>

pkg/application/version.go

@@ -0,0 +1,69 @@
+package application
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/spf13/cobra"
+
+	"git.flexabyte.io/flexabyte/go-kit/pkg/semver"
+)
+
+const (
+	versionName      = "version"
+	versionShortHand = "V"
+	versionUsage     = "Show version information"
+)
+
+var (
+	version     semver.Version
+	versionFlag bool
+	versionCmd  = &cobra.Command{
+		Use:   versionName,
+		Short: versionUsage,
+		RunE:  versionRunFuncE,
+	}
+)
+
+func addVersionFlag(cmd *cobra.Command) {
+	cmd.PersistentFlags().BoolVarP(&versionFlag, versionName, versionShortHand, false, versionUsage)
+}
+
+func configureVersionFlag(cmd *cobra.Command, v semver.Version) {
+	version = v
+	cmd.AddCommand(versionCmd)
+	addVersionFlag(cmd)
+}
+
+func printVersion(v semver.Version) string {
+	var output string
+	if !verboseFlag {
+		output = v.String()
+	}
+
+	if jsonOutputFlag {
+		var b []byte
+		b, _ = json.Marshal(v)
+		output = string(b)
+	}
+
+	if output != "" {
+		return output
+	}
+
+	return fmt.Sprintf(
+		"Full: %s\nVersion: %s\nChannel: %s\nCommit: %s\nDate: %s",
+		v.String(),
+		v.Number(),
+		v.Release(),
+		v.Commit(),
+		v.Date(),
+	)
+}
+
+func versionRunFuncE(cmd *cobra.Command, args []string) error {
+	if _, err := fmt.Fprintln(outWriter, printVersion(version)); err != nil {
+		return err
+	}
+	return nil
+}