Support helm functions on raw app args (#81)

Signed-off-by: Prasad Ghangal <[email protected]>

pkg/apps/raw/raw.go

@@ -25,6 +25,7 @@ import (
 	"k8s.io/client-go/tools/clientcmd"
 
 	"github.com/kbrew-dev/kbrew/pkg/config"
+	"github.com/kbrew-dev/kbrew/pkg/engine"
 	"github.com/kbrew-dev/kbrew/pkg/kube"
 	"github.com/kbrew-dev/kbrew/pkg/yaml"
 )
@@ -75,6 +76,31 @@ func New(c config.App) (*App, error) {
 	return rApp, nil
 }
 
+func (r *App) resolveArgs() error {
+	//TODO: user global singleton kubeconfig in all modules
+	config, err := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
+		clientcmd.NewDefaultClientConfigLoadingRules(),
+		&clientcmd.ConfigOverrides{},
+	).ClientConfig()
+	if err != nil {
+		return errors.Wrapf(err, "Failed to load Kubernetes config")
+	}
+
+	e := engine.NewEngine(config)
+
+	// TODO(@sahil.lakhwani): Parse only templated arguments
+	if len(r.App.Args) != 0 {
+		for arg, value := range r.App.Args {
+			v, err := e.Render(fmt.Sprintf("%v", value))
+			if err != nil {
+				return err
+			}
+			r.App.Args[arg] = v
+		}
+	}
+	return nil
+}
+
 // Install installs the app specified by name, version and namespace.
 func (r *App) Install(ctx context.Context, name, namespace, version string, options map[string]string) error {
 	fmt.Printf("Installing raw app %s/%s\n", r.App.Repository.Name, name)
@@ -84,6 +110,10 @@ func (r *App) Install(ctx context.Context, name, namespace, version string, opti
 		return err
 	}
 
+	if err := r.resolveArgs(); err != nil {
+		return err
+	}
+
 	patchedManifest, err := patchManifest(manifest, r.App.Args)
 	if err != nil {
 		return err
@@ -93,7 +123,7 @@ func (r *App) Install(ctx context.Context, name, namespace, version string, opti
 	if err := kubectlCommand(ctx, install, name, namespace, patchedManifest); err != nil {
 		return err
 	}
-	fmt.Printf("Waiting for components to be ready for %s", name)
+	fmt.Printf("Waiting for components to be ready for %s\n", name)
 	return r.waitForReady(ctx, namespace)
 }