feat(forge): add repo label iterator

Co-Authored-By: Virgil <virgil@lethean.io>

docs/architecture.md

@@ -89,7 +89,7 @@ The `gitea/` package mirrors this using `GITEA_URL`/`GITEA_TOKEN` and `gitea.*`
 | `client.go` | `New`, `NewFromConfig`, `GetCurrentUser`, `ForkRepo`, `CreatePullRequest` |
 | `repos.go` | `ListOrgRepos`, `ListOrgReposIter`, `ListUserRepos`, `ListUserReposIter`, `GetRepo`, `CreateOrgRepo`, `DeleteRepo`, `MigrateRepo` |
 | `issues.go` | `ListIssues`, `ListIssuesIter`, `GetIssue`, `CreateIssue`, `EditIssue`, `AssignIssue`, `ListPullRequests`, `ListPullRequestsIter`, `GetPullRequest`, `CreateIssueComment`, `ListIssueComments`, `ListIssueCommentsIter`, `CloseIssue` |
-| `labels.go` | `ListOrgLabels`, `ListRepoLabels`, `CreateRepoLabel`, `GetLabelByName`, `EnsureLabel`, `AddIssueLabels`, `RemoveIssueLabel` |
+| `labels.go` | `ListOrgLabels`, `ListRepoLabels`, `ListRepoLabelsIter`, `CreateRepoLabel`, `GetLabelByName`, `EnsureLabel`, `AddIssueLabels`, `RemoveIssueLabel` |
 | `prs.go` | `MergePullRequest`, `SetPRDraft`, `ListPRReviews`, `GetCombinedStatus`, `DismissReview` |
 | `webhooks.go` | `CreateRepoWebhook`, `ListRepoWebhooks` |
 | `orgs.go` | `ListMyOrgs`, `GetOrg`, `CreateOrg` |

forge/labels.go

@@ -3,6 +3,8 @@
 package forge
 
 import (
+	"iter"
+
 	strings "dappco.re/go/core/scm/internal/ax/stringsx"
 
 	forgejo "codeberg.org/mvdkleijn/forgejo-sdk/forgejo/v2"
@@ -71,6 +73,35 @@ func (c *Client) ListRepoLabels(owner, repo string) ([]*forgejo.Label, error) {
 	return all, nil
 }
 
+// ListRepoLabelsIter returns an iterator over labels for a repository.
+// Usage: ListRepoLabelsIter(...)
+func (c *Client) ListRepoLabelsIter(owner, repo string) iter.Seq2[*forgejo.Label, error] {
+	return func(yield func(*forgejo.Label, error) bool) {
+		page := 1
+
+		for {
+			labels, resp, err := c.api.ListRepoLabels(owner, repo, forgejo.ListLabelsOptions{
+				ListOptions: forgejo.ListOptions{Page: page, PageSize: 50},
+			})
+			if err != nil {
+				yield(nil, log.E("forge.ListRepoLabels", "failed to list repo labels", err))
+				return
+			}
+
+			for _, label := range labels {
+				if !yield(label, nil) {
+					return
+				}
+			}
+
+			if resp == nil || page >= resp.LastPage {
+				break
+			}
+			page++
+		}
+	}
+}
+
 // CreateRepoLabel creates a label on a repository.
 // Usage: CreateRepoLabel(...)
 func (c *Client) CreateRepoLabel(owner, repo string, opts forgejo.CreateLabelOption) (*forgejo.Label, error) {

forge/labels_test.go

@@ -3,6 +3,8 @@
 package forge
 
 import (
+	"net/http"
+	"net/http/httptest"
 	"testing"
 
 	forgejo "codeberg.org/mvdkleijn/forgejo-sdk/forgejo/v2"
@@ -35,6 +37,53 @@ func TestClient_ListRepoLabels_Bad_ServerError_Good(t *testing.T) {
 	assert.Contains(t, err.Error(), "failed to list repo labels")
 }
 
+func TestClient_ListRepoLabelsIter_Good_Paginates_Good(t *testing.T) {
+	mux := http.NewServeMux()
+	mux.HandleFunc("/api/v1/version", func(w http.ResponseWriter, r *http.Request) {
+		jsonResponse(w, map[string]string{"version": "1.21.0"})
+	})
+	mux.HandleFunc("/api/v1/repos/test-org/org-repo/labels", func(w http.ResponseWriter, r *http.Request) {
+		switch r.URL.Query().Get("page") {
+		case "2":
+			jsonResponse(w, []map[string]any{
+				{"id": 3, "name": "documentation", "color": "#00aa00"},
+			})
+		default:
+			w.Header().Set("Link", "<http://"+r.Host+"/api/v1/repos/test-org/org-repo/labels?page=2>; rel=\"next\", <http://"+r.Host+"/api/v1/repos/test-org/org-repo/labels?page=2>; rel=\"last\"")
+			jsonResponse(w, []map[string]any{
+				{"id": 1, "name": "bug", "color": "#ff0000"},
+				{"id": 2, "name": "feature", "color": "#0000ff"},
+			})
+		}
+	})
+
+	srv := httptest.NewServer(mux)
+	defer srv.Close()
+
+	client, err := New(srv.URL, "test-token")
+	require.NoError(t, err)
+
+	var names []string
+	for label, err := range client.ListRepoLabelsIter("test-org", "org-repo") {
+		require.NoError(t, err)
+		names = append(names, label.Name)
+	}
+
+	require.Len(t, names, 3)
+	assert.Equal(t, []string{"bug", "feature", "documentation"}, names)
+}
+
+func TestClient_ListRepoLabelsIter_Bad_ServerError_Good(t *testing.T) {
+	client, srv := newErrorServer(t)
+	defer srv.Close()
+
+	for _, err := range client.ListRepoLabelsIter("test-org", "org-repo") {
+		assert.Error(t, err)
+		assert.Contains(t, err.Error(), "failed to list repo labels")
+		break
+	}
+}
+
 func TestClient_CreateRepoLabel_Good(t *testing.T) {
 	client, srv := newTestClient(t)
 	defer srv.Close()