(chore) Add delete interface and implementation for all options

Add delete functionality to remove APIs and webhooks from projects.
Users can now clean up scaffolded resources.

Author: camilamacedo86

.gitignore

@@ -30,4 +30,4 @@ docs/book/src/docs
 /testdata/**legacy**
 
 ## Skip testdata files that generate by tests using TestContext
-**/e2e-*/**
+e2e-*

AGENTS.md

@@ -199,9 +199,21 @@ Plugins implement interfaces from `pkg/plugin/`:
 - `Init` - project initialization (`kubebuilder init`)
 - `CreateAPI` - API creation (`kubebuilder create api`)
 - `CreateWebhook` - webhook creation (`kubebuilder create webhook`)
+- `DeleteAPI` - API deletion (`kubebuilder delete api`)
+- `DeleteWebhook` - webhook deletion (`kubebuilder delete webhook`)
 - `Edit` - post-init modifications (`kubebuilder edit`)
 - `Bundle` - groups multiple plugins
 
+**Delete = Undo of Create:**
+
+Each plugin's delete implementation MUST undo exactly what its create implementation did:
+- `go/v4`: Removes Go code (API types, controllers, main.go imports/setup, suite_test.go)
+- `kustomize/v2`: Removes manifests (samples, RBAC, CRD kustomization entries)
+- `deploy-image/v1-alpha`: Removes plugin metadata from PROJECT file
+- When plugins run in chain (e.g., `--plugins deploy-image/v1-alpha`), both layout and additional plugins execute
+
+**Integration tests MUST verify**: `state_before_create == state_after_delete`
+
 **Plugin Bundles:**
 
 Default bundle (`pkg/cli/init.go`): `go.kubebuilder.io/v4` + `kustomize.common.kubebuilder.io/v2`
@@ -249,7 +261,8 @@ Controllers implement `Reconcile(ctx, req) (ctrl.Result, error)`:
 - **Requeue on pending work** - Return `ctrl.Result{Requeue: true}`
 
 ### Testing Pattern
-E2E tests use `utils.TestContext` from `test/e2e/utils/test_context.go`:
+
+**Integration Tests** use `utils.TestContext` from `test/e2e/utils/test_context.go`:
 
 ```go
 ctx := utils.NewTestContext(util.KubebuilderBinName, "GO111MODULE=on")
@@ -259,19 +272,70 @@ ctx.Make("build", "test")
 ctx.LoadImageToKindCluster()
 ```
 
+**Baseline Testing (Required for Delete):**
+
+Delete integration tests MUST verify exact state restoration:
+
+```go
+It("should restore exact state after delete", func() {
+    mainBefore, _ := os.ReadFile("cmd/main.go")
+    ctx.CreateAPI(...)
+    ctx.DeleteAPI(..., "-y")
+    mainAfter, _ := os.ReadFile("cmd/main.go")
+    Expect(mainAfter).To(Equal(mainBefore))  // Exact match required
+})
+```
+
 ## CLI Reference
 
 After `make install`:
 
 ```bash
+# Initialize project
 kubebuilder init --domain example.com --repo github.com/example/myproject
+
+# Create resources
 kubebuilder create api --group batch --version v1 --kind CronJob
 kubebuilder create webhook --group batch --version v1 --kind CronJob
-kubebuilder edit --plugins=helm/v2-alpha
+
+# Delete resources (complete undo of create)
+kubebuilder delete api --group batch --version v1 --kind CronJob
+kubebuilder delete webhook --group batch --version v1 --kind CronJob --defaulting
+
+# Delete with plugin chain
+kubebuilder delete api --group app --version v1 --kind Cache --plugins deploy-image/v1-alpha
+
+# Delete optional plugin features
+kubebuilder delete --plugins helm/v2-alpha
+kubebuilder delete --plugins grafana/v1-alpha
+
+# Edit project
+kubebuilder edit --plugins helm/v2-alpha
+
+# Alpha commands
 kubebuilder alpha generate    # Experimental: generate from PROJECT file
 kubebuilder alpha update      # Experimental: update to latest plugin versions
 ```
 
+## Implementing Delete
+
+**Rule**: If you add a `create` command, you MUST add the corresponding `delete` command.
+
+**Key Principle**: Each plugin undoes ONLY what it created. When plugins run in chain (default: `go/v4` + `kustomize/v2`), each cleans its own artifacts:
+- `go/v4` → removes Go code (types, controllers, main.go, suite_test.go)
+- `kustomize/v2` → removes manifests (samples, RBAC, CRD entries)
+- Additional plugins → remove their metadata from PROJECT file
+
+**Shared Resources**: Imports/code used by multiple resources are preserved until the last one is deleted (e.g., `appv1` import kept while any app/v1 API exists).
+
+**Integration Test**: Add `delete_integration_test.go` with baseline verification:
+```go
+baseline := captureState()
+createResource()
+deleteResource("-y")
+Expect(currentState()).To(Equal(baseline))  // Exact match required
+```
+
 ## Common Patterns
 
 ### Code Style
@@ -334,7 +398,7 @@ log.Error(err, "Failed to create Pod", "name", name)
 - **Integration tests** (`*_integration_test.go` in `pkg/`) - Test multiple components together without cluster
   - Must have `//go:build integration` tag at the top
   - May create temp dirs, download binaries, or scaffold files
-  - Examples: alpha update, grafana scaffolding, helm chart generation
+  - **Delete tests**: MUST use baseline pattern (verify before_create == after_delete)
 - **E2E tests** (`test/e2e/`) - **ONLY** for tests requiring a Kubernetes cluster (KIND)
   - `v4/plugin_cluster_test.go` - Test v4 plugin deployment
   - `helm/plugin_cluster_test.go` - Test Helm chart deployment

docs/book/src/plugins/available/autoupdate-v1-alpha.md

@@ -38,6 +38,12 @@ kubebuilder edit --plugins="autoupdate/v1-alpha"
 kubebuilder init --plugins=go/v4,autoupdate/v1-alpha
 ```
 
+- To remove the auto-update workflow from your project:
+
+```shell
+kubebuilder delete --plugins autoupdate/v1-alpha
+```
+
 ### Optional: GitHub Models AI Summary
 
 By default, the workflow works without GitHub Models to avoid permission errors.

docs/book/src/plugins/available/deploy-image-plugin-v1-alpha.md

@@ -82,9 +82,25 @@ export MEMCACHED_IMAGE="memcached:1.4.36-alpine"
 
 ## Subcommands
 
-The `deploy-image` plugin includes the following subcommand:
+The `deploy-image` plugin implements:
 
-- `create api`: Use this command to scaffold the API and controller code to manage the container image.
+- `create api` - Scaffolds the API and controller code to manage the container image
+
+### Deleting APIs Created with Deploy-Image
+
+To delete an API created with deploy-image, you **must** include the plugin flag:
+
+```sh
+kubebuilder delete api --group <group> --version <version> --kind <kind> \
+  --plugins=deploy-image/v1-alpha
+```
+
+If you forget the `--plugins` flag, you'll receive an error message showing the exact command to use.
+
+The delete operation removes:
+- API and controller files (via go/v4 plugin in the chain)
+- Deploy-image metadata from the PROJECT file
+- Kustomize manifests (samples, RBAC)
 
 ## Affected files
 

docs/book/src/plugins/available/go-v4-plugin.md

@@ -32,6 +32,8 @@ kubebuilder init --domain tutorial.kubebuilder.io --repo tutorial.kubebuilder.io
 -  Edit -  `kubebuilder edit [OPTIONS]`
 -  Create API -  `kubebuilder create api [OPTIONS]`
 -  Create Webhook - `kubebuilder create webhook [OPTIONS]`
+-  Delete API - `kubebuilder delete api [OPTIONS]`
+-  Delete Webhook - `kubebuilder delete webhook [OPTIONS]`
 
 ## Further resources
 

docs/book/src/plugins/available/grafana-v1-alpha.md

@@ -49,11 +49,24 @@ The Grafana plugin is attached to the `init` subcommand and the `edit` subcomman
 kubebuilder init --plugins grafana.kubebuilder.io/v1-alpha
 
 # Enable grafana plugin to an existing project
-kubebuilder edit --plugins grafana.kubebuilder.io/v1-alpha
+kubebuilder edit --plugins grafana/v1-alpha
+
+# Remove grafana dashboards from project
+kubebuilder delete --plugins grafana/v1-alpha
 ```
 
 The plugin will create a new directory and scaffold the JSON files under it (i.e. `grafana/controller-runtime-metrics.json`).
 
+### Removing Grafana Dashboards
+
+To remove Grafana manifests from your project:
+
+```sh
+kubebuilder delete --plugins grafana/v1-alpha
+```
+
+This removes the `grafana/` directory and all dashboard files.
+
 #### Show case:
 
 See an example of how to use the plugin in your project:
@@ -203,7 +216,7 @@ customMetrics:
 
 #### Scaffold Manifest
 
-Once `config.yaml` is configured, you can run `kubebuilder edit --plugins grafana.kubebuilder.io/v1-alpha` again.
+Once `config.yaml` is configured, you can run `kubebuilder edit --plugins grafana/v1-alpha` again.
 This time, the plugin will generate `grafana/custom-metrics/custom-metrics-dashboard.json`, which can be imported to Grafana UI.
 
 #### Show case:

docs/book/src/plugins/available/helm-v2-alpha.md

@@ -74,6 +74,19 @@ kubebuilder edit --plugins=helm/v2-alpha \
   --output-dir=helm-charts
 ```
 
+### Removing Helm Charts
+
+To remove the Helm chart from your project:
+
+```shell
+kubebuilder delete --plugins helm/v2-alpha
+```
+
+This removes:
+- `dist/chart/` directory
+- `.github/workflows/test-chart.yml`
+- Plugin configuration from PROJECT file
+
 ## Chart Structure
 
 The plugin creates a chart layout that matches your `config/`:

docs/book/src/plugins/available/kustomize-v2.md

@@ -70,14 +70,18 @@ The kustomize plugin implements the following subcommands:
 
 * init (`$ kubebuilder init [OPTIONS]`)
 * create api (`$ kubebuilder create api [OPTIONS]`)
-* create webhook (`$ kubebuilder create api [OPTIONS]`)
+* create webhook (`$ kubebuilder create webhook [OPTIONS]`)
+* delete api (`$ kubebuilder delete api [OPTIONS]`)
+* delete webhook (`$ kubebuilder delete webhook [OPTIONS]`)
 
 <aside class="note">
-<h1>Create API and Webhook</h1>
+<h1>Create and Delete</h1>
 
-The implementation for the `create api` subcommand scaffolds the kustomize
-manifests specific to each API. See more [here][kustomize-create-api].
-The same applies to `create webhook`.
+The `create api` subcommand scaffolds kustomize manifests specific to each API
+(CRD bases, samples, RBAC). See more [here][kustomize-create-api].
+
+The `delete api` subcommand removes these manifests when the API is deleted.
+The same applies to `create webhook` and `delete webhook`.
 
 </aside>
 

docs/book/src/plugins/extending/extending_cli_features_and_plugins.md

@@ -62,7 +62,9 @@ of the following CLI commands:
 - `init`: Initializes the project structure.
 - `create api`: Scaffolds a new API and controller.
 - `create webhook`: Scaffolds a new webhook.
-- `edit`: edit the project structure.
+- `delete api`: Deletes an API and its associated files.
+- `delete webhook`: Deletes a webhook and its associated files.
+- `edit`: Updates the project structure.
 
 Here’s an example of using the `init` subcommand with a custom plugin:
 

docs/book/src/plugins/extending/external-plugins.md

@@ -133,6 +133,8 @@ External plugins can support the following Kubebuilder subcommands:
 - `init`: Project initialization
 - `create api`: Scaffold Kubernetes API definitions
 - `create webhook`: Scaffold Kubernetes webhooks
+- `delete api`: Delete Kubernetes API definitions and associated files
+- `delete webhook`: Delete Kubernetes webhooks and associated files
 - `edit`: Update project configuration
 
 **Optional subcommands for enhanced user experience:**