feat(changelog): omit version heading in forge release notes

The forge ui usually shows the release name right above the description,
so this removes an unecessary duplicate bit of information.

In addition this also cleans up the changelog interface a bit and moves
functionality where it belongs. Prepares a bit for custom changelogs in
the future.

Closes #32

internal/changelog/changelog.go

@@ -26,27 +26,37 @@ func init() {
 	}
 }
 
-func NewChangelogEntry(logger *slog.Logger, commits []commitparser.AnalyzedCommit, version, link, prefix, suffix string) (string, error) {
-	features := make([]commitparser.AnalyzedCommit, 0)
-	fixes := make([]commitparser.AnalyzedCommit, 0)
-
-	for _, commit := range commits {
-		switch commit.Type {
-		case "feat":
-			features = append(features, commit)
-		case "fix":
-			fixes = append(fixes, commit)
-		}
+func DefaultTemplate() *template.Template {
+	return changelogTemplate
+}
+
+type Data struct {
+	Commits     map[string][]commitparser.AnalyzedCommit
+	Version     string
+	VersionLink string
+	Prefix      string
+	Suffix      string
+}
+
+func New(commits map[string][]commitparser.AnalyzedCommit, version, versionLink, prefix, suffix string) Data {
+	return Data{
+		Commits:     commits,
+		Version:     version,
+		VersionLink: versionLink,
+		Prefix:      prefix,
+		Suffix:      suffix,
 	}
+}
+
+type Formatting struct {
+	HideVersionTitle bool
+}
 
+func Entry(logger *slog.Logger, tpl *template.Template, data Data, formatting Formatting) (string, error) {
 	var changelog bytes.Buffer
-	err := changelogTemplate.Execute(&changelog, map[string]any{
-		"Features":    features,
-		"Fixes":       fixes,
-		"Version":     version,
-		"VersionLink": link,
-		"Prefix":      prefix,
-		"Suffix":      suffix,
+	err := tpl.Execute(&changelog, map[string]any{
+		"Data":       data,
+		"Formatting": formatting,
 	})
 	if err != nil {
 		return "", err

internal/changelog/changelog.md.tpl

@@ -1,22 +1,24 @@
-## [{{.Version}}]({{.VersionLink}})
-{{- if .Prefix }}
-{{ .Prefix }}
+{{define "entry" -}}
+- {{ if .Scope }}**{{.Scope}}**: {{end}}{{.Description}}
+{{ end }}
+
+{{- if not .Formatting.HideVersionTitle }}
+## [{{.Data.Version}}]({{.Data.VersionLink}})
+{{ end -}}
+{{- if .Data.Prefix }}
+{{ .Data.Prefix }}
 {{ end -}}
-{{- if (gt (len .Features) 0) }}
+{{- with .Data.Commits.feat }}
 ### Features
 
-{{ range .Features -}}
-- {{ if .Scope }}**{{.Scope}}**: {{end}}{{.Description}}
-{{ end -}}
+{{ range . -}}{{template "entry" .}}{{end}}
 {{- end -}}
-{{- if (gt (len .Fixes) 0) }}
+{{- with .Data.Commits.fix }}
 ### Bug Fixes
 
-{{ range .Fixes -}}
-- {{ if .Scope }}**{{.Scope}}**: {{end}}{{.Description}}
-{{ end -}}
+{{ range . -}}{{template "entry" .}}{{end}}
 {{- end -}}
 
-{{- if .Suffix }}
-{{ .Suffix }}
+{{- if .Data.Suffix }}
+{{ .Data.Suffix }}
 {{ end }}

internal/changelog/changelog_test.go

@@ -168,7 +168,8 @@ This version is compatible with flux-compensator v2.2 - v2.9.
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			got, err := NewChangelogEntry(slog.Default(), tt.args.analyzedCommits, tt.args.version, tt.args.link, tt.args.prefix, tt.args.suffix)
+			data := New(commitparser.ByType(tt.args.analyzedCommits), tt.args.version, tt.args.link, tt.args.prefix, tt.args.suffix)
+			got, err := Entry(slog.Default(), DefaultTemplate(), data, Formatting{})
 			if !tt.wantErr(t, err) {
 				return
 			}

internal/commitparser/commitparser.go

@@ -15,3 +15,18 @@ type AnalyzedCommit struct {
 	Scope          *string
 	BreakingChange bool
 }
+
+// ByType groups the Commits by the type field. Used by the Changelog.
+func ByType(in []AnalyzedCommit) map[string][]AnalyzedCommit {
+	out := map[string][]AnalyzedCommit{}
+
+	for _, commit := range in {
+		if out[commit.Type] == nil {
+			out[commit.Type] = make([]AnalyzedCommit, 0, 1)
+		}
+
+		out[commit.Type] = append(out[commit.Type], commit)
+	}
+
+	return out
+}

releaserpleaser.go

@@ -243,7 +243,9 @@ func (rp *ReleaserPleaser) runReconcileReleasePR(ctx context.Context) error {
 		return err
 	}
 
-	changelogEntry, err := changelog.NewChangelogEntry(logger, analyzedCommits, nextVersion, rp.forge.ReleaseURL(nextVersion), releaseOverrides.Prefix, releaseOverrides.Suffix)
+	changelogData := changelog.New(commitparser.ByType(analyzedCommits), nextVersion, rp.forge.ReleaseURL(nextVersion), releaseOverrides.Prefix, releaseOverrides.Suffix)
+
+	changelogEntry, err := changelog.Entry(logger, changelog.DefaultTemplate(), changelogData, changelog.Formatting{})
 	if err != nil {
 		return fmt.Errorf("failed to build changelog entry: %w", err)
 	}
@@ -289,9 +291,16 @@ func (rp *ReleaserPleaser) runReconcileReleasePR(ctx context.Context) error {
 		logger.InfoContext(ctx, "file content is already up-to-date in remote branch, skipping push")
 	}
 
+	// We do not need the version title here. In the pull request the version is available from the title, and in the
+	// release on the Forge its usually in a heading somewhere above the text.
+	changelogEntryPullRequest, err := changelog.Entry(logger, changelog.DefaultTemplate(), changelogData, changelog.Formatting{HideVersionTitle: true})
+	if err != nil {
+		return fmt.Errorf("failed to build pull request changelog entry: %w", err)
+	}
+
 	// Open/Update PR
 	if pr == nil {
-		pr, err = releasepr.NewReleasePullRequest(rpBranch, rp.targetBranch, nextVersion, changelogEntry)
+		pr, err = releasepr.NewReleasePullRequest(rpBranch, rp.targetBranch, nextVersion, changelogEntryPullRequest)
 		if err != nil {
 			return err
 		}
@@ -308,7 +317,7 @@ func (rp *ReleaserPleaser) runReconcileReleasePR(ctx context.Context) error {
 		if err != nil {
 			return err
 		}
-		err = pr.SetDescription(changelogEntry, overrides)
+		err = pr.SetDescription(changelogEntryPullRequest, overrides)
 		if err != nil {
 			return err
 		}