Add namespace and collection inventories

internal/configuration/listing.go

@@ -6,6 +6,12 @@ import (
 	"gitea.maximumdirect.net/eric/promptkit/internal/domain"
 )
 
+// CollectionIdentity is the captured metadata for one final collection entry.
+type CollectionIdentity struct {
+	Namespace      string
+	ReleaseVersion *string
+}
+
 func (state *loaded) ListProfiles(ctx context.Context) ([]string, error) {
 	if err := ctx.Err(); err != nil {
 		return nil, err
@@ -28,6 +34,44 @@ func (state *loaded) ListBackends(ctx context.Context) ([]string, error) {
 	return backends, nil
 }
 
+func (state *loaded) ListNamespaces(ctx context.Context, kinds []string) ([]string, error) {
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+	selected := kinds
+	if len(selected) == 0 {
+		selected = []string{"backend", "profile", "prompt"}
+	}
+	set := make(map[string]struct{})
+	for _, kind := range selected {
+		for _, namespace := range state.namespaces[kind] {
+			set[namespace] = struct{}{}
+		}
+	}
+	namespaces := sortedKeys(set)
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+	return namespaces, nil
+}
+
+func (state *loaded) ListCollections(ctx context.Context) ([]CollectionIdentity, error) {
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+	collections := make([]CollectionIdentity, len(state.collections))
+	for index, collection := range state.collections {
+		collections[index] = CollectionIdentity{
+			Namespace:      collection.Namespace,
+			ReleaseVersion: stringPointerValue(collection.ReleaseVersion),
+		}
+	}
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+	return collections, nil
+}
+
 func (state *loaded) ListPrompts(ctx context.Context) ([]domain.PromptIdentity, error) {
 	if err := ctx.Err(); err != nil {
 		return nil, err