feat: parse existing release pr

cmd/rp/cmd/run.go

@@ -4,6 +4,7 @@ Copyright © 2024 Julian Tölle
 package cmd
 
 import (
+	"context"
 	"fmt"
 
 	"github.com/spf13/cobra"
@@ -11,6 +12,10 @@ import (
 	rp "github.com/apricote/releaser-pleaser"
 )
 
+const (
+	RELEASER_PLEASER_BRANCH = "releaser-pleaser--branches--%s"
+)
+
 // runCmd represents the run command
 var runCmd = &cobra.Command{
 	Use:  "run",
@@ -56,34 +61,65 @@ func run(cmd *cobra.Command, args []string) error {
 		})
 	}
 
-	tag, err := f.LatestTag(ctx)
+	changesets, err := getChangesetsFromForge(ctx, f)
 	if err != nil {
-		return err
+		return fmt.Errorf("failed to get changesets: %w", err)
+	}
+
+	err = reconcileReleasePR(ctx, f, changesets)
+	if err != nil {
+		return fmt.Errorf("failed to reconcile release pr: %w", err)
+	}
+
+	return nil
+}
+
+func getChangesetsFromForge(ctx context.Context, forge rp.Forge) ([]rp.Changeset, error) {
+	tag, err := forge.LatestTag(ctx)
+	if err != nil {
+		return nil, err
 	}
 
 	logger.InfoContext(ctx, "Latest Tag", "tag.hash", tag.Hash, "tag.name", tag.Name)
 
-	releaseableCommits, err := f.CommitsSince(ctx, tag)
+	releasableCommits, err := forge.CommitsSince(ctx, tag)
 	if err != nil {
-		return err
+		return nil, err
 	}
 
-	logger.InfoContext(ctx, "Found releasable commits", "length", len(releaseableCommits))
+	logger.InfoContext(ctx, "Found releasable commits", "length", len(releasableCommits))
 
-	changesets, err := f.Changesets(ctx, releaseableCommits)
+	changesets, err := forge.Changesets(ctx, releasableCommits)
 	if err != nil {
-		return err
+		return nil, err
 	}
 
 	logger.InfoContext(ctx, "Found changesets", "length", len(changesets))
 
-	for _, changeset := range changesets {
-		fmt.Printf("%s %s\n", changeset.Identifier, changeset.URL)
-		for _, entry := range changeset.ChangelogEntries {
-			fmt.Printf("  - %s %s\n", entry.Hash, entry.Description)
+	return changesets, nil
+}
+
+func reconcileReleasePR(ctx context.Context, forge rp.Forge, changesets []rp.Changeset) error {
+	// Check Forge for open PR
+	// Get any modifications from open PR
+	// Clone Repo
+	// Run Updaters + Changelog
+	// Upsert PR
+	pr, err := forge.PullRequestForBranch(ctx, fmt.Sprintf(RELEASER_PLEASER_BRANCH, flagBranch))
+	if err != nil {
+		return err
 	}
+
+	if pr != nil {
+		logger.InfoContext(ctx, "found existing release pull request: %d: %s", pr.ID, pr.Title)
 	}
-	fmt.Printf("Previous Tag: %s\n", tag.Name)
+
+	releaseOverrides, err := pr.GetOverrides()
+	if err != nil {
+		return err
+	}
+
+	// ...
 
 	return nil
 }

forge.go

@@ -8,6 +8,11 @@ import (
 	"github.com/google/go-github/v63/github"
 )
 
+const (
+	GITHUB_PER_PAGE_MAX  = 100
+	GITHUB_PR_STATE_OPEN = "open"
+)
+
 type Changeset struct {
 	URL              string
 	Identifier       string
@@ -26,6 +31,10 @@ type Forge interface {
 
 	// Changesets looks up the Pull/Merge Requests for each commit, returning its parsed metadata.
 	Changesets(context.Context, []Commit) ([]Changeset, error)
+
+	// PullRequestForBranch returns the open pull request between the branch and ForgeOptions.BaseBranch. If no open PR
+	// exists, it returns nil.
+	PullRequestForBranch(context.Context, string) (*ReleasePullRequest, error)
 }
 
 type ForgeOptions struct {
@@ -106,7 +115,7 @@ func (g *GitHub) commitsSinceTag(ctx context.Context, tag *Tag) ([]*github.Repos
 			ctx, g.options.Owner, g.options.Repo,
 			tag.Hash, head, &github.ListOptions{
 				Page:    page,
-				PerPage: 100,
+				PerPage: GITHUB_PER_PAGE_MAX,
 			})
 		if err != nil {
 			return nil, err
@@ -149,7 +158,7 @@ func (g *GitHub) Changesets(ctx context.Context, commits []Commit) ([]Changeset,
 				ctx, g.options.Owner, g.options.Repo,
 				commit.Hash, &github.ListOptions{
 					Page:    page,
-					PerPage: 100,
+					PerPage: GITHUB_PER_PAGE_MAX,
 				})
 			if err != nil {
 				return nil, err
@@ -199,6 +208,43 @@ func (g *GitHub) Changesets(ctx context.Context, commits []Commit) ([]Changeset,
 	return changesets, nil
 }
 
+func (g *GitHub) PullRequestForBranch(ctx context.Context, branch string) (*ReleasePullRequest, error) {
+	page := 1
+
+	for {
+		prs, resp, err := g.client.PullRequests.ListPullRequestsWithCommit(ctx, g.options.Owner, g.options.Repo, branch, &github.ListOptions{
+			Page:    page,
+			PerPage: GITHUB_PER_PAGE_MAX,
+		})
+		if err != nil {
+			return nil, err
+		}
+
+		for _, pr := range prs {
+			if pr.Base.GetLabel() == g.options.BaseBranch && pr.Head.GetLabel() == branch && pr.GetState() == GITHUB_PR_STATE_OPEN {
+				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,
+				}, nil
+			}
+		}
+
+		if page == resp.LastPage || resp.LastPage == 0 {
+			break
+		}
+		page = resp.NextPage
+	}
+
+	return nil, nil
+}
+
 func (g *GitHubOptions) autodiscover() {
 	// TODO: Read settings from GitHub Actions env vars
 }

releasepr.go

@@ -0,0 +1,122 @@
+package rp
+
+import (
+	"fmt"
+
+	"github.com/yuin/goldmark/ast"
+	"github.com/yuin/goldmark/parser"
+	"github.com/yuin/goldmark/text"
+)
+
+type ReleasePullRequest struct {
+	ID          int
+	Title       string
+	Description string
+	Labels      []string
+}
+
+type ReleaseOverrides struct {
+	Prefix string
+	Suffix string
+	// TODO: Doing the changelog for normal releases after previews requires to know about this while fetching the changesets
+	NextVersionType NextVersionType
+}
+
+type NextVersionType int
+
+const (
+	NextVersionTypeUndefined NextVersionType = iota
+	NextVersionTypeNormal
+	NextVersionTypeRC
+	NextVersionTypeBeta
+	NextVersionTypeAlpha
+)
+
+// PR Labels
+const (
+	LabelNextVersionTypeNormal = "rp-next-version::normal"
+	LabelNextVersionTypeRC     = "rp-next-version::rc"
+	LabelNextVersionTypeBeta   = "rp-next-version::beta"
+	LabelNextVersionTypeAlpha  = "rp-next-version::alpha"
+)
+
+const (
+	DescriptionLanguagePrefix = "rp-prefix"
+	DescriptionLanguageSuffix = "rp-suffix"
+)
+
+func (pr *ReleasePullRequest) GetOverrides() (ReleaseOverrides, error) {
+	overrides := ReleaseOverrides{}
+	overrides = pr.parseVersioningFlags(overrides)
+	overrides, err := pr.parseDescription(overrides)
+	if err != nil {
+		return ReleaseOverrides{}, err
+	}
+
+	return overrides, nil
+}
+
+func (pr *ReleasePullRequest) parseVersioningFlags(overrides ReleaseOverrides) ReleaseOverrides {
+	for _, label := range pr.Labels {
+		switch label {
+		// Versioning
+		case LabelNextVersionTypeNormal:
+			overrides.NextVersionType = NextVersionTypeNormal
+		case LabelNextVersionTypeRC:
+			overrides.NextVersionType = NextVersionTypeRC
+		case LabelNextVersionTypeBeta:
+			overrides.NextVersionType = NextVersionTypeBeta
+		case LabelNextVersionTypeAlpha:
+			overrides.NextVersionType = NextVersionTypeAlpha
+		}
+	}
+
+	return overrides
+}
+
+func (pr *ReleasePullRequest) parseDescription(overrides ReleaseOverrides) (ReleaseOverrides, error) {
+	source := []byte(pr.Description)
+	descriptionAST := parser.NewParser().Parse(text.NewReader(source))
+
+	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() != ast.KindFencedCodeBlock {
+			return ast.WalkContinue, nil
+		}
+
+		codeBlock, ok := n.(*ast.FencedCodeBlock)
+		if !ok {
+			return ast.WalkStop, fmt.Errorf("node has unexpected type: %T", n)
+		}
+
+		switch string(codeBlock.Language(source)) {
+		case DescriptionLanguagePrefix:
+			overrides.Prefix = textFromLines(source, codeBlock)
+		case DescriptionLanguageSuffix:
+			overrides.Suffix = textFromLines(source, codeBlock)
+		}
+
+		return ast.WalkContinue, nil
+	})
+	if err != nil {
+		return ReleaseOverrides{}, err
+	}
+
+	return overrides, nil
+}
+
+func textFromLines(source []byte, n ast.Node) string {
+	content := make([]byte, 0)
+
+	l := n.Lines().Len()
+	for i := 0; i < l; i++ {
+		line := n.Lines().At(i)
+		content = append(content, line.Value(source)...)
+	}
+
+	return string(content)
+
+}