Delay the display of warnings related to experimental features

pkg/odo/cli/feature/doc.go

@@ -1,2 +1,4 @@
 // Package feature allows to determine whether a given feature is enabled or not at the CLI level.
+// Active features are accumulated in a global `enabledFeatures` variable, and warning
+// can be displayed with the DisplayWarnings function
 package feature

pkg/odo/cli/feature/features.go

@@ -2,6 +2,7 @@ package feature
 
 import (
 	"context"
+	"sort"
 
 	"github.com/redhat-developer/odo/pkg/log"
 )
@@ -28,6 +29,8 @@ var (
 		isExperimental: true,
 		description:    "flag: --run-on",
 	}
+
+	enabledFeatures = map[OdoFeature]struct{}{}
 )
 
 // IsEnabled returns whether the specified feature should be enabled or not.
@@ -42,8 +45,21 @@ func IsEnabled(ctx context.Context, feat OdoFeature) bool {
 	// Features marked as experimental are enabled only if the experimental mode is set
 	experimentalModeEnabled := isExperimentalModeEnabled(ctx)
 	if experimentalModeEnabled {
+		enabledFeatures[feat] = struct{}{}
+	}
+	return experimentalModeEnabled
+}
+
+func DisplayWarnings() {
+	features := make([]OdoFeature, 0, len(enabledFeatures))
+	for k := range enabledFeatures {
+		features = append(features, k)
+	}
+	sort.Slice(features, func(i, j int) bool {
+		return features[i].id < features[j].id
+	})
+	for _, feat := range features {
 		log.Experimentalf("Experimental mode enabled for %s. Use at your own risk. More details on https://odo.dev/docs/user-guides/advanced/experimental-mode",
 			feat.description)
 	}
-	return experimentalModeEnabled
 }

pkg/odo/genericclioptions/runnable.go

@@ -26,6 +26,7 @@ import (
 
 	"gopkg.in/AlecAivazis/survey.v1"
 
+	"github.com/redhat-developer/odo/pkg/odo/cli/feature"
 	"github.com/redhat-developer/odo/pkg/odo/cli/ui"
 
 	"k8s.io/klog"
@@ -202,6 +203,8 @@ func GenericRun(o Runnable, cmd *cobra.Command, args []string) error {
 	}
 	o.SetClientset(deps)
 
+	feature.DisplayWarnings()
+
 	ctx = fcontext.WithJsonOutput(ctx, commonflags.GetJsonOutputValue(cmdLineObj))
 	ctx = fcontext.WithRunOn(ctx, platform)
 	ctx = odocontext.WithApplication(ctx, defaultAppName)