do not show generating hint in the command preview (#397)

pkg/cmd/preview/options.go

@@ -62,32 +62,34 @@ func (o *PreviewOptions) Validate() error {
 
 func (o *PreviewOptions) Run() error {
 	// Set no style
-	if o.NoStyle {
+	if o.NoStyle || o.Output == jsonOutput {
 		pterm.DisableStyling()
 		pterm.DisableColor()
 	}
-	if o.Output == jsonOutput {
-		pterm.DisableStyling()
-		pterm.DisableColor()
-	}
-
 	// Parse project and stack of work directory
 	project, stack, err := projectstack.DetectProjectAndStack(o.WorkDir)
 	if err != nil {
 		return err
 	}
 
 	// Get compile result
-	sp, err := spec.GenerateSpecWithSpinner(&generator.Options{
+	options := &generator.Options{
 		WorkDir:     o.WorkDir,
 		Filenames:   o.Filenames,
 		Settings:    o.Settings,
 		Arguments:   o.Arguments,
 		Overrides:   o.Overrides,
 		DisableNone: o.DisableNone,
 		OverrideAST: o.OverrideAST,
-		NoStyle:     o.NoStyle || o.Output == jsonOutput,
-	}, project, stack)
+		NoStyle:     o.NoStyle,
+	}
+
+	var sp *models.Spec
+	if o.Output == jsonOutput {
+		sp, err = spec.GenerateSpec(options, project, stack)
+	} else {
+		sp, err = spec.GenerateSpecWithSpinner(options, project, stack)
+	}
 	if err != nil {
 		return err
 	}

pkg/cmd/preview/options_test.go

@@ -81,7 +81,7 @@ func TestPreviewOptions_Run(t *testing.T) {
 	t.Run("no changes", func(t *testing.T) {
 		defer monkey.UnpatchAll()
 		mockDetectProjectAndStack()
-		mockGenerateSpec()
+		mockGenerateSpecWithSpinner()
 		mockNewKubernetesRuntime()
 
 		o := NewPreviewOptions()
@@ -93,7 +93,7 @@ func TestPreviewOptions_Run(t *testing.T) {
 	t.Run("detail is true", func(t *testing.T) {
 		defer monkey.UnpatchAll()
 		mockDetectProjectAndStack()
-		mockGenerateSpec()
+		mockGenerateSpecWithSpinner()
 		mockNewKubernetesRuntime()
 		mockOperationPreview()
 		mockPromptDetail("")
@@ -121,7 +121,7 @@ func TestPreviewOptions_Run(t *testing.T) {
 	t.Run("no style is true", func(t *testing.T) {
 		defer monkey.UnpatchAll()
 		mockDetectProjectAndStack()
-		mockGenerateSpec()
+		mockGenerateSpecWithSpinner()
 		mockNewKubernetesRuntime()
 		mockOperationPreview()
 		mockPromptDetail("")
@@ -219,7 +219,7 @@ func mockDetectProjectAndStack() {
 	})
 }
 
-func mockGenerateSpec() {
+func mockGenerateSpecWithSpinner() {
 	monkey.Patch(spec.GenerateSpecWithSpinner, func(
 		o *generator.Options,
 		project *projectstack.Project,
@@ -229,6 +229,16 @@ func mockGenerateSpec() {
 	})
 }
 
+func mockGenerateSpec() {
+	monkey.Patch(spec.GenerateSpec, func(
+		o *generator.Options,
+		project *projectstack.Project,
+		stack *projectstack.Stack,
+	) (*models.Spec, error) {
+		return &models.Spec{Resources: []models.Resource{sa1, sa2, sa3}}, nil
+	})
+}
+
 func mockNewKubernetesRuntime() {
 	monkey.Patch(kubernetes.NewKubernetesRuntime, func() (runtime.Runtime, error) {
 		return &fooRuntime{}, nil

pkg/cmd/spec/generator.go

@@ -23,6 +23,31 @@ func GenerateSpecWithSpinner(o *generator.Options, project *projectstack.Project
 		sp, _ = sp.Start(fmt.Sprintf("Generating Spec in the Stack %s...", stack.Name))
 	}
 
+	// style means color and prompt here. Currently, sp will be nil only when o.NoStyle is true
+	style := !o.NoStyle && sp != nil
+
+	spec, err := GenerateSpec(o, project, stack)
+	// failed
+	if err != nil {
+		if style {
+			sp.Fail()
+			return nil, err
+		} else {
+			// TODO: we will replace this implementation with KCL no-style flag when it is supported
+			return nil, errors.New(stripansi.Strip(err.Error()))
+		}
+	}
+
+	// success
+	if style {
+		sp.Success()
+	} else {
+		fmt.Println()
+	}
+	return spec, nil
+}
+
+func GenerateSpec(o *generator.Options, project *projectstack.Project, stack *projectstack.Stack) (*models.Spec, error) {
 	// Choose the generator
 	var g generator.Generator
 	pg := project.Generator
@@ -43,25 +68,7 @@ func GenerateSpecWithSpinner(o *generator.Options, project *projectstack.Project
 
 	spec, err := g.GenerateSpec(o, stack)
 	if err != nil {
-		if !o.NoStyle && sp != nil {
-			sp.Fail()
-		}
-
-		// TODO: we will replace this implementation with KCL no-style flag
-		// when it is supported
-		if o.NoStyle {
-			return nil, errors.New(stripansi.Strip(err.Error()))
-		}
-
-		return nil, err
+		return nil, errors.New(stripansi.Strip(err.Error()))
 	}
-
-	if !o.NoStyle && sp != nil {
-		sp.Success()
-	}
-	if !o.NoStyle {
-		fmt.Println()
-	}
-
 	return spec, nil
 }