feat: tag releases on merged prs

cmd/rp/cmd/run.go

@@ -40,9 +40,16 @@ func init() {
 	runCmd.PersistentFlags().StringVar(&flagRepo, "repo", "", "")
 }
 
-func run(cmd *cobra.Command, args []string) error {
+func run(cmd *cobra.Command, _ []string) error {
 	ctx := cmd.Context()
 
+	logger.DebugContext(ctx, "run called",
+		"forge", flagForge,
+		"branch", flagBranch,
+		"owner", flagOwner,
+		"repo", flagRepo,
+	)
+
 	var f rp.Forge
 
 	forgeOptions := rp.ForgeOptions{
@@ -54,6 +61,7 @@ func run(cmd *cobra.Command, args []string) error {
 	//case "gitlab":
 	//f = rp.NewGitLab(forgeOptions)
 	case "github":
+		logger.DebugContext(ctx, "using forge GitHub")
 		f = rp.NewGitHub(logger, &rp.GitHubOptions{
 			ForgeOptions: forgeOptions,
 			Owner:        flagOwner,
@@ -61,6 +69,11 @@ func run(cmd *cobra.Command, args []string) error {
 		})
 	}
 
+	err := createPendingReleases(ctx, f)
+	if err != nil {
+		return fmt.Errorf("failed to create pending releases: %w", err)
+	}
+
 	changesets, releases, err := getChangesetsFromForge(ctx, f)
 	if err != nil {
 		return fmt.Errorf("failed to get changesets: %w", err)
@@ -74,6 +87,70 @@ func run(cmd *cobra.Command, args []string) error {
 	return nil
 }
 
+func createPendingReleases(ctx context.Context, forge rp.Forge) error {
+	logger.InfoContext(ctx, "checking for pending releases")
+	prs, err := forge.PendingReleases(ctx)
+	if err != nil {
+		return err
+	}
+
+	if len(prs) == 0 {
+		logger.InfoContext(ctx, "No pending releases found")
+		return nil
+	}
+
+	logger.InfoContext(ctx, "Found pending releases", "length", len(prs))
+
+	for _, pr := range prs {
+		err = createPendingRelease(ctx, forge, pr)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func createPendingRelease(ctx context.Context, forge rp.Forge, pr *rp.ReleasePullRequest) error {
+	logger := logger.With("pr.id", pr.ID, "pr.title", pr.Title)
+
+	if pr.ReleaseCommit == nil {
+		return fmt.Errorf("pull request is missing the merge commit")
+	}
+
+	logger.Info("Creating release", "commit.hash", pr.ReleaseCommit.Hash)
+
+	version, err := pr.Version()
+	if err != nil {
+		return err
+	}
+
+	changelog, err := pr.ChangelogText()
+	if err != nil {
+		return err
+	}
+
+	// TODO: pre-release & latest
+
+	logger.DebugContext(ctx, "Creating release on forge")
+	err = forge.CreateRelease(ctx, *pr.ReleaseCommit, version, changelog, false, true)
+	if err != nil {
+		return fmt.Errorf("failed to create release on forge: %w", err)
+	}
+	logger.DebugContext(ctx, "created release", "release.title", version, "release.url", forge.ReleaseURL(version))
+
+	logger.DebugContext(ctx, "updating pr labels")
+	err = forge.SetPullRequestLabels(ctx, pr, []string{rp.LabelReleasePending}, []string{rp.LabelReleaseTagged})
+	if err != nil {
+		return err
+	}
+	logger.DebugContext(ctx, "updated pr labels")
+
+	logger.InfoContext(ctx, "Created release", "release.title", version, "release.url", forge.ReleaseURL(version))
+
+	return nil
+}
+
 func getChangesetsFromForge(ctx context.Context, forge rp.Forge) ([]rp.Changeset, rp.Releases, error) {
 	releases, err := forge.LatestTags(ctx)
 	if err != nil {
@@ -123,6 +200,20 @@ func reconcileReleasePR(ctx context.Context, forge rp.Forge, changesets []rp.Cha
 		logger.InfoContext(ctx, "found existing release pull request", "pr.id", pr.ID, "pr.title", pr.Title)
 	}
 
+	if len(changesets) == 0 {
+		if pr != nil {
+			logger.InfoContext(ctx, "closing existing pull requests, no changesets available", "pr.id", pr.ID, "pr.title", pr.Title)
+			err = forge.ClosePullRequest(ctx, pr)
+			if err != nil {
+				return err
+			}
+		} else {
+			logger.InfoContext(ctx, "No changesets available for release")
+		}
+
+		return nil
+	}
+
 	var releaseOverrides rp.ReleaseOverrides
 	if pr != nil {
 		releaseOverrides, err = pr.GetOverrides()

forge.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"log/slog"
 	"os"
+	"slices"
 	"strings"
 
 	"github.com/blang/semver/v4"
@@ -15,10 +16,11 @@ import (
 )
 
 const (
-	GitHubPerPageMax  = 100
-	GitHubPRStateOpen = "open"
-	GitHubEnvAPIToken = "GITHUB_TOKEN"
-	GitHubEnvUsername = "GITHUB_USER"
+	GitHubPerPageMax    = 100
+	GitHubPRStateOpen   = "open"
+	GitHubPRStateClosed = "closed"
+	GitHubEnvAPIToken   = "GITHUB_TOKEN"
+	GitHubEnvUsername   = "GITHUB_USER"
 )
 
 type Changeset struct {
@@ -51,6 +53,12 @@ type Forge interface {
 
 	CreatePullRequest(context.Context, *ReleasePullRequest) error
 	UpdatePullRequest(context.Context, *ReleasePullRequest) error
+	SetPullRequestLabels(ctx context.Context, pr *ReleasePullRequest, remove, add []string) error
+	ClosePullRequest(context.Context, *ReleasePullRequest) error
+
+	PendingReleases(context.Context) ([]*ReleasePullRequest, error)
+
+	CreateRelease(ctx context.Context, commit Commit, title, changelog string, prelease, latest bool) error
 }
 
 type ForgeOptions struct {
@@ -334,18 +342,7 @@ func (g *GitHub) PullRequestForBranch(ctx context.Context, branch string) (*Rele
 
 		for _, pr := range prs {
 			if pr.GetBase().GetRef() == g.options.BaseBranch && pr.GetHead().GetRef() == branch && pr.GetState() == GitHubPRStateOpen {
-				labels := make([]string, 0, len(pr.Labels))
-				for _, label := range pr.Labels {
-					labels = append(labels, label.GetName())
-				}
-
-				return &ReleasePullRequest{
-					ID:          pr.GetNumber(),
-					Title:       pr.GetTitle(),
-					Description: pr.GetBody(),
-					Labels:      labels,
-					Head:        pr.GetHead().GetRef(),
-				}, nil
+				return gitHubPRToReleasePullRequest(pr), nil
 			}
 		}
 
@@ -359,7 +356,6 @@ func (g *GitHub) PullRequestForBranch(ctx context.Context, branch string) (*Rele
 }
 
 func (g *GitHub) CreatePullRequest(ctx context.Context, pr *ReleasePullRequest) error {
-	// TODO: Labels
 	ghPR, _, err := g.client.PullRequests.Create(
 		ctx, g.options.Owner, g.options.Repo,
 		&github.NewPullRequest{
@@ -373,24 +369,21 @@ func (g *GitHub) CreatePullRequest(ctx context.Context, pr *ReleasePullRequest)
 		return err
 	}
 
-	_, _, err = g.client.Issues.AddLabelsToIssue(
-		ctx, g.options.Owner, g.options.Repo,
-		ghPR.GetNumber(), pr.Labels,
-	)
+	// TODO: String ID?
+	pr.ID = ghPR.GetNumber()
+
+	err = g.SetPullRequestLabels(ctx, pr, []string{}, pr.Labels)
 	if err != nil {
 		return err
 	}
 
-	// TODO: String ID?
-	pr.ID = ghPR.GetNumber()
-
 	return nil
 }
 
 func (g *GitHub) UpdatePullRequest(ctx context.Context, pr *ReleasePullRequest) error {
 	_, _, err := g.client.PullRequests.Edit(
-		ctx, g.options.Owner, g.options.Repo, pr.ID,
-		&github.PullRequest{
+		ctx, g.options.Owner, g.options.Repo,
+		pr.ID, &github.PullRequest{
 			Title: &pr.Title,
 			Body:  &pr.Description,
 		},
@@ -402,6 +395,141 @@ func (g *GitHub) UpdatePullRequest(ctx context.Context, pr *ReleasePullRequest)
 	return nil
 }
 
+func (g *GitHub) SetPullRequestLabels(ctx context.Context, pr *ReleasePullRequest, remove, add []string) error {
+	for _, label := range remove {
+		_, err := g.client.Issues.RemoveLabelForIssue(
+			ctx, g.options.Owner, g.options.Repo,
+			pr.ID, label,
+		)
+		if err != nil {
+			return err
+		}
+	}
+
+	_, _, err := g.client.Issues.AddLabelsToIssue(
+		ctx, g.options.Owner, g.options.Repo,
+		pr.ID, add,
+	)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (g *GitHub) ClosePullRequest(ctx context.Context, pr *ReleasePullRequest) error {
+	_, _, err := g.client.PullRequests.Edit(
+		ctx, g.options.Owner, g.options.Repo,
+		pr.ID, &github.PullRequest{
+			State: Pointer(GitHubPRStateClosed),
+		},
+	)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (g *GitHub) PendingReleases(ctx context.Context) ([]*ReleasePullRequest, error) {
+	page := 1
+
+	var prs []*ReleasePullRequest
+
+	for {
+		ghPRs, resp, err := g.client.PullRequests.List(
+			ctx, g.options.Owner, g.options.Repo,
+			&github.PullRequestListOptions{
+				State: GitHubPRStateClosed,
+				Base:  g.options.BaseBranch,
+				ListOptions: github.ListOptions{
+					Page:    page,
+					PerPage: GitHubPerPageMax,
+				},
+			})
+		if err != nil {
+			return nil, err
+		}
+
+		if prs == nil && resp.LastPage > 0 {
+			// Pre-initialize slice on first request
+			g.log.Debug("found pending releases", "pages", resp.LastPage)
+			prs = make([]*ReleasePullRequest, 0, (resp.LastPage-1)*GitHubPerPageMax)
+		}
+
+		for _, pr := range ghPRs {
+			pending := slices.ContainsFunc(pr.Labels, func(l *github.Label) bool {
+				return l.GetName() == LabelReleasePending
+			})
+			if !pending {
+				continue
+			}
+
+			// pr.Merged is always nil :(
+			if pr.MergedAt == nil {
+				// Closed and not merged
+				continue
+			}
+
+			prs = append(prs, gitHubPRToReleasePullRequest(pr))
+		}
+
+		if page == resp.LastPage || resp.LastPage == 0 {
+			break
+		}
+		page = resp.NextPage
+	}
+
+	return prs, nil
+}
+
+func (g *GitHub) CreateRelease(ctx context.Context, commit Commit, title, changelog string, preRelease, latest bool) error {
+	makeLatest := ""
+	if latest {
+		makeLatest = "true"
+	} else {
+		makeLatest = "false"
+	}
+	_, _, err := g.client.Repositories.CreateRelease(
+		ctx, g.options.Owner, g.options.Repo,
+		&github.RepositoryRelease{
+			TagName:         &title,
+			TargetCommitish: &commit.Hash,
+			Name:            &title,
+			Body:            &changelog,
+			Prerelease:      &preRelease,
+			MakeLatest:      &makeLatest,
+		},
+	)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func gitHubPRToReleasePullRequest(pr *github.PullRequest) *ReleasePullRequest {
+	labels := make([]string, 0, len(pr.Labels))
+	for _, label := range pr.Labels {
+		labels = append(labels, label.GetName())
+	}
+
+	var releaseCommit *Commit
+	if pr.MergeCommitSHA != nil {
+		releaseCommit = &Commit{Hash: pr.GetMergeCommitSHA()}
+	}
+
+	return &ReleasePullRequest{
+		ID:          pr.GetNumber(),
+		Title:       pr.GetTitle(),
+		Description: pr.GetBody(),
+		Labels:      labels,
+
+		Head:          pr.GetHead().GetRef(),
+		ReleaseCommit: releaseCommit,
+	}
+}
+
 func (g *GitHubOptions) autodiscover() {
 	if apiToken := os.Getenv(GitHubEnvAPIToken); apiToken != "" {
 		g.APIToken = apiToken
@@ -462,3 +590,7 @@ func NewGitLab(options ForgeOptions) *GitLab {
 func (g *GitLab) RepoURL() string {
 	return fmt.Sprintf("https://gitlab.com/%s", g.options.Repository)
 }
+
+func Pointer[T any](value T) *T {
+	return &value
+}

releasepr.go

@@ -5,6 +5,7 @@ import (
 	_ "embed"
 	"fmt"
 	"log"
+	"regexp"
 	"text/template"
 
 	"github.com/yuin/goldmark/ast"
@@ -35,7 +36,8 @@ type ReleasePullRequest struct {
 	Description string
 	Labels      []string
 
-	Head string
+	Head          string
+	ReleaseCommit *Commit
 }
 
 func NewReleasePullRequest(head, branch, version, changelogEntry string) (*ReleasePullRequest, error) {
@@ -104,6 +106,15 @@ const (
 
 const (
 	MarkdownSectionOverrides = "overrides"
+	MarkdownSectionChangelog = "changelog"
+)
+
+const (
+	TitleFormat = "chore(%s): release %s"
+)
+
+var (
+	TitleRegex = regexp.MustCompile("chore(.*): release (.*)")
 )
 
 func (pr *ReleasePullRequest) GetOverrides() (ReleaseOverrides, error) {
@@ -169,7 +180,7 @@ func (pr *ReleasePullRequest) parseDescription(overrides ReleaseOverrides) (Rele
 	return overrides, nil
 }
 
-func (pr *ReleasePullRequest) getCurrentOverridesText() (string, error) {
+func (pr *ReleasePullRequest) overridesText() (string, error) {
 	source := []byte(pr.Description)
 	gm := markdown.New()
 	descriptionAST := gm.Parser().Parse(text.NewReader(source))
@@ -214,6 +225,51 @@ func (pr *ReleasePullRequest) getCurrentOverridesText() (string, error) {
 	return outputBuffer.String(), nil
 }
 
+func (pr *ReleasePullRequest) ChangelogText() (string, error) {
+	source := []byte(pr.Description)
+	gm := markdown.New()
+	descriptionAST := gm.Parser().Parse(text.NewReader(source))
+
+	var section *east.Section
+
+	err := ast.Walk(descriptionAST, func(n ast.Node, entering bool) (ast.WalkStatus, error) {
+		if !entering {
+			return ast.WalkContinue, nil
+		}
+
+		if n.Type() != ast.TypeBlock || n.Kind() != east.KindSection {
+			return ast.WalkContinue, nil
+		}
+
+		anySection, ok := n.(*east.Section)
+		if !ok {
+			return ast.WalkStop, fmt.Errorf("node has unexpected type: %T", n)
+		}
+
+		if anySection.Name != MarkdownSectionChangelog {
+			return ast.WalkContinue, nil
+		}
+
+		section = anySection
+		return ast.WalkStop, nil
+	})
+	if err != nil {
+		return "", err
+	}
+
+	if section == nil {
+		return "", nil
+	}
+
+	outputBuffer := new(bytes.Buffer)
+	err = gm.Renderer().Render(outputBuffer, source, section)
+	if err != nil {
+		return "", err
+	}
+
+	return outputBuffer.String(), nil
+}
+
 func textFromLines(source []byte, n ast.Node) string {
 	content := make([]byte, 0)
 
@@ -230,8 +286,17 @@ func (pr *ReleasePullRequest) SetTitle(branch, version string) {
 	pr.Title = fmt.Sprintf("chore(%s): release %s", branch, version)
 }
 
+func (pr *ReleasePullRequest) Version() (string, error) {
+	matches := TitleRegex.FindStringSubmatch(pr.Title)
+	if len(matches) != 3 {
+		return "", fmt.Errorf("title has unexpected format")
+	}
+
+	return matches[2], nil
+}
+
 func (pr *ReleasePullRequest) SetDescription(changelogEntry string) error {
-	overrides, err := pr.getCurrentOverridesText()
+	overrides, err := pr.overridesText()
 	if err != nil {
 		return err
 	}

releasepr.md.tpl

@@ -1,4 +1,8 @@
+---
+
+<!-- section-start changelog -->
 {{ .Changelog }}
+<!-- section-end changelog -->
 
 ---
 

releasepr_test.go

@@ -58,7 +58,11 @@ func TestReleasePullRequest_SetDescription(t *testing.T) {
 			name:           "empty description",
 			pr:             &ReleasePullRequest{},
 			changelogEntry: `## v1.0.0`,
-			want: `## v1.0.0
+			want: `---
+
+<!-- section-start changelog -->
+## v1.0.0
+<!-- section-end changelog -->
 
 ---
 
@@ -87,11 +91,15 @@ func TestReleasePullRequest_SetDescription(t *testing.T) {
 		{
 			name: "existing overrides",
 			pr: &ReleasePullRequest{
-				Description: `## v0.1.0
+				Description: `---
+
+<!-- section-start changelog -->
+## v0.1.0
 
 ### Features
 
 - bedazzle
+<!-- section-end changelog -->
 
 ---
 
@@ -117,7 +125,11 @@ This release is awesome!
 `,
 			},
 			changelogEntry: `## v1.0.0`,
-			want: `## v1.0.0
+			want: `---
+
+<!-- section-start changelog -->
+## v1.0.0
+<!-- section-end changelog -->
 
 ---