feat: port generate-folders function from TS to Go

functions/go/Makefile

@@ -25,6 +25,7 @@ FUNCTIONS := \
 	create-setters \
 	ensure-name-substring \
 	gatekeeper \
+	generate-folders \
 	generate-kpt-pkg-docs \
 	kubeconform \
 	list-setters \

functions/go/generate-folders/README.md

@@ -0,0 +1,105 @@
+# generate-folders
+
+## Overview
+
+The `generate-folders` function generates
+[Folder](https://cloud.google.com/config-connector/docs/reference/resource-docs/resourcemanager/folder)
+resources from `ResourceHierarchy` custom resources.
+
+## Usage
+
+The function accepts `ResourceHierarchy` resources in the following API versions:
+
+| API Version | Status |
+| --- | --- |
+| `blueprints.cloud.google.com/v1alpha3` | **Current** |
+| `dev.cft.v1alpha2` | Deprecated |
+| `dev.cft.v1alpha1` | Deprecated |
+
+### Simple Example (v3)
+
+```yaml
+apiVersion: blueprints.cloud.google.com/v1alpha3
+kind: ResourceHierarchy
+metadata:
+  name: my-hierarchy
+spec:
+  parentRef:
+    kind: Organization
+    external: "123456789"
+  config:
+    - Dev:
+      - Team1
+      - Team2
+    - Prod
+```
+
+This produces `Folder` resources named `dev`, `dev.team1`, `dev.team2`, and
+`prod`, each with proper parent references and display names.
+
+### Subtree Example (v3)
+
+```yaml
+apiVersion: blueprints.cloud.google.com/v1alpha3
+kind: ResourceHierarchy
+metadata:
+  name: my-hierarchy
+spec:
+  parentRef:
+    kind: Organization
+    external: "123456789"
+  subtrees:
+    teams:
+      - Team1
+      - Team2
+  config:
+    - Dev:
+        $subtree: teams
+    - Prod:
+        $subtree: teams
+```
+
+Subtrees allow reusing folder structure definitions across multiple branches.
+
+### Parent Reference Types
+
+- `kind: Organization` — uses `spec.organizationRef.external` on generated
+  Folders (v3) or `cnrm.cloud.google.com/organization-id` annotation (v1/v2)
+- `kind: Folder` — uses `spec.folderRef.external` on generated Folders (v3) or
+  `cnrm.cloud.google.com/folder-ref` annotation (v1/v2)
+
+### Annotation Inheritance
+
+For v2/v3 `ResourceHierarchy` resources, annotations on the hierarchy object
+are inherited by generated `Folder` resources, except for internal kpt
+annotations (e.g., `config.kubernetes.io/local-config`,
+`internal.config.kubernetes.io/*`). The v1 implementation does **not**
+support annotation inheritance.
+
+### Name Normalization
+
+Generated folder names follow Kubernetes DNS subdomain naming rules:
+
+- Converted to lowercase
+- Quotes removed
+- Underscores and spaces replaced with dashes
+- Invalid characters removed
+- Path segments joined with dots (e.g., `dev.team1`)
+
+## Function Invocation
+
+```shell
+kpt fn eval --image ghcr.io/kptdev/krm-functions-catalog/generate-folders:latest
+```
+
+## Building
+
+```shell
+go build -o generate-folders .
+```
+
+## Testing
+
+```shell
+go test -v ./transformer/
+```

functions/go/generate-folders/go.mod

@@ -0,0 +1,37 @@
+module github.com/kptdev/krm-functions-catalog/functions/go/generate-folders
+
+go 1.25.7
+
+require (
+	github.com/kptdev/krm-functions-sdk/go/fn v1.0.1
+	github.com/stretchr/testify v1.10.0
+	sigs.k8s.io/yaml v1.6.0
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
+	github.com/go-errors/errors v1.5.1 // indirect
+	github.com/go-logr/logr v1.4.2 // indirect
+	github.com/go-openapi/jsonpointer v0.21.1 // indirect
+	github.com/go-openapi/jsonreference v0.21.0 // indirect
+	github.com/go-openapi/swag v0.23.1 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/google/gnostic-models v0.7.0 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
+	github.com/kptdev/kpt v1.0.0-beta.60 // indirect
+	github.com/mailru/easyjson v0.9.0 // indirect
+	github.com/monochromegane/go-gitignore v0.0.0-20200626010858-205db1a8cc00 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
+	github.com/xlab/treeprint v1.2.0 // indirect
+	go.yaml.in/yaml/v2 v2.4.2 // indirect
+	go.yaml.in/yaml/v3 v3.0.4 // indirect
+	golang.org/x/sys v0.37.0 // indirect
+	google.golang.org/protobuf v1.36.10 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+	k8s.io/apimachinery v0.34.1 // indirect
+	k8s.io/klog/v2 v2.130.1 // indirect
+	k8s.io/kube-openapi v0.0.0-20250910181357-589584f1c912 // indirect
+	sigs.k8s.io/kustomize/api v0.20.1 // indirect
+	sigs.k8s.io/kustomize/kyaml v0.20.1 // indirect
+)

functions/go/generate-folders/go.sum

@@ -0,0 +1,109 @@
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+sigs.k8s.io/kustomize/api v0.20.1/go.mod h1:t6hUFxO+Ph0VxIk1sKp1WS0dOjbPCtLJ4p8aADLwqjM=
+sigs.k8s.io/kustomize/kyaml v0.20.1 h1:PCMnA2mrVbRP3NIB6v9kYCAc38uvFLVs8j/CD567A78=
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functions/go/generate-folders/main.go

@@ -0,0 +1,24 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package main
+
+import (
+	"os"
+)
+
+func main() {
+	if err := run(); err != nil {
+		os.Exit(1)
+	}
+}

functions/go/generate-folders/metadata.yaml

@@ -0,0 +1,6 @@
+image: ghcr.io/kptdev/krm-functions-catalog/generate-folders
+description: Generate Folder resources from ResourceHierarchy custom resources.
+tags:
+  - generator
+sourceURL: https://github.com/kptdev/krm-functions-catalog/tree/main/functions/go/generate-folders
+license: Apache-2.0

functions/go/generate-folders/run.go

@@ -0,0 +1,26 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build !(js && wasm)
+
+package main
+
+import (
+	"github.com/kptdev/krm-functions-catalog/functions/go/generate-folders/transformer"
+	"github.com/kptdev/krm-functions-sdk/go/fn"
+)
+
+func run() error {
+	return fn.AsMain(fn.ResourceListProcessorFunc(generate_folders.Run))
+}