version - add version flag, modify goreleaser config

.goreleaser.yml

@@ -8,6 +8,9 @@ builds:
   - id: kubectl-envsubst
     main: ./cmd/kubectl-envsubst.go
     binary: kubectl-envsubst
+    ldflags:
+      - -s -w
+      - -X github.com/hashmap-kz/kubectl-envsubst/pkg/version.Version={{.Version}}
     env:
       - CGO_ENABLED=0
     goos:

cmd/app/app.go

@@ -8,6 +8,7 @@ import (
 	"strings"
 
 	"github.com/hashmap-kz/kubectl-envsubst/pkg/cmd"
+	"github.com/hashmap-kz/kubectl-envsubst/pkg/version"
 )
 
 // runApp executes the plugin, with logic divided into smaller, testable components
@@ -18,8 +19,20 @@ func RunApp() error {
 		return err
 	}
 
-	// either help message, either 'apply' was not provided
-	if flags.Help || len(flags.Others) == 0 {
+	// show help message
+	if flags.Help {
+		fmt.Println(cmd.UsageMessage)
+		return nil
+	}
+
+	// show version
+	if flags.Version {
+		fmt.Println(version.Version)
+		return nil
+	}
+
+	// 'apply' was not provided
+	if len(flags.Others) == 0 {
 		fmt.Println(cmd.UsageMessage)
 		return nil
 	}

pkg/cmd/rawargs.go

@@ -19,6 +19,7 @@ type ArgsRawRecognized struct {
 	Help                  bool
 	Others                []string
 	HasStdin              bool
+	Version               bool
 }
 
 func allEmpty(values []string) bool {
@@ -93,13 +94,17 @@ func ParseArgs() (ArgsRawRecognized, error) {
 			result.EnvsubstAllowedPrefix = append(result.EnvsubstAllowedPrefix, list...)
 			i++ // Skip the next argument
 
-		// Handle recursive and help flags
+		// Handle boolean flags
+
 		case arg == "--recursive" || arg == "-R":
 			result.Recursive = true
 
 		case arg == "--help" || arg == "-h":
 			result.Help = true
 
+		case arg == "--version":
+			result.Version = true
+
 		// Handle unrecognized arguments
 		default:
 			result.Others = append(result.Others, arg)

pkg/cmd/rawargs_test.go

@@ -185,6 +185,16 @@ func TestParseArgs(t *testing.T) {
 			},
 			expectedError: false,
 		},
+		{
+			name: "Valid args with unrecognized argument that looks like a short flag (3)",
+			args: []string{"-h", "-xyz", "--version"},
+			expectedResult: ArgsRawRecognized{
+				Help:    true,
+				Version: true,
+				Others:  []string{"-xyz"},
+			},
+			expectedError: false,
+		},
 	}
 
 	for _, tc := range cases {

pkg/version/version.go

@@ -0,0 +1,4 @@
+package version
+
+// Version holds the current version of kubectl-envsubst plugin.
+var Version = "dev"