Add version flag

pkg/cmd/root/help.go

@@ -6,6 +6,7 @@ import (
 	"regexp"
 	"strings"
 
+	version "github.com/OctopusDeploy/cli"
 	"github.com/OctopusDeploy/cli/pkg/constants"
 	"github.com/OctopusDeploy/cli/pkg/constants/annotations"
 	"github.com/OctopusDeploy/cli/pkg/output"
@@ -24,6 +25,20 @@ func rootHelpFunc(cmd *cobra.Command, _ []string) {
 	libraryCmds := []string{}
 	infrastructureCmds := []string{}
 	additionalCmds := []string{}
+
+	flags := cmd.Flags()
+
+	if isRootCmd(cmd) {
+		out := cmd.OutOrStdout()
+		if versionVal, err := flags.GetBool(constants.FlagHelp); err == nil && versionVal {
+			fmt.Fprintln(out, strings.TrimSpace(version.Version))
+			return
+		} else if err != nil {
+			fmt.Fprintln(out, err)
+			return
+		}
+	}
+
 	for _, c := range cmd.Commands() {
 		if c.Short == "" {
 			continue
@@ -119,7 +134,7 @@ func rootHelpFunc(cmd *cobra.Command, _ []string) {
 }
 
 func calculatePadding(cmd *cobra.Command) int {
-	namePadding:= 12
+	namePadding := 12
 	for _, c := range cmd.Commands() {
 		if len(c.Name()) > namePadding {
 			namePadding = len(c.Name()) + 2

pkg/cmd/root/root.go

@@ -117,5 +117,7 @@ func NewCmdRoot(f factory.Factory, clientFactory apiclient.ClientFactory, askPro
 		}
 	}
 
+	cmd.Flags().Bool(constants.FlagVersion, false, "Show version")
+
 	return cmd
 }

pkg/constants/constants.go

@@ -6,6 +6,7 @@ const (
 
 // flags for command line switches
 const (
+	FlagVersion            = "version"
 	FlagHelp               = "help"
 	FlagSpace              = "space"
 	FlagOutputFormat       = "output-format"