chore(go): use vociferate for unreleased parsing

cmd/vociferate/main.go

@@ -13,6 +13,7 @@ func main() {
 	version := flag.String("version", "", "semantic version to release, with or without leading v")
 	date := flag.String("date", "", "release date in YYYY-MM-DD format")
 	recommend := flag.Bool("recommend", false, "print the recommended next release tag based on the changelog")
+	printUnreleased := flag.Bool("print-unreleased", false, "print the current Unreleased changelog body")
 	root := flag.String("root", ".", "repository root to update")
 	versionFile := flag.String("version-file", "", "path to the version file, relative to --root")
 	versionPattern := flag.String("version-pattern", "", "regexp with one capture group for the version value")
@@ -41,8 +42,18 @@ func main() {
 		return
 	}
 
+	if *printUnreleased {
+		body, err := vociferate.UnreleasedBody(absRoot, opts)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "print unreleased: %v\n", err)
+			os.Exit(1)
+		}
+		fmt.Print(body)
+		return
+	}
+
 	if *version == "" || *date == "" {
-		fmt.Fprintln(os.Stderr, "usage: vociferate --version <version> --date <YYYY-MM-DD> [--root <dir>] [--version-file <path>] [--version-pattern <regexp>] [--changelog <path>] | --recommend [--root <dir>] [--version-file <path>] [--version-pattern <regexp>] [--changelog <path>]")
+		fmt.Fprintln(os.Stderr, "usage: vociferate --version <version> --date <YYYY-MM-DD> [--root <dir>] [--version-file <path>] [--version-pattern <regexp>] [--changelog <path>] | --recommend [--root <dir>] [--version-file <path>] [--version-pattern <regexp>] [--changelog <path>] | --print-unreleased [--root <dir>] [--changelog <path>]")
 		os.Exit(2)
 	}
 

decorate-pr/action.yml

@@ -147,9 +147,15 @@ runs:
           -H "Content-Type: application/json" \
           "$comments_url" >/dev/null
 
+    - name: Setup Go for vociferate
+      uses: actions/setup-go@v5
+      with:
+        go-version-file: ${{ github.action_path }}/../go.mod
+
     - name: Extract changelog unreleased entries
       id: extract-changelog
       shell: bash
+      working-directory: ${{ github.action_path }}/..
       env:
         CHANGELOG: ${{ inputs.changelog }}
       run: |
@@ -160,24 +166,10 @@ runs:
           exit 0
         fi
 
-        # Extract everything between [Unreleased] header and the next [X.Y.Z] header
-        unreleased="$(awk '
-          /^## \[Unreleased\]/ { in_unreleased=1; next }
-          /^## \[[0-9]+\.[0-9]+\.[0-9]+\]/ { if (in_unreleased) exit }
-          in_unreleased && NF { print }
-        ' "$CHANGELOG")"
-
-        # Use a temporary file to handle multiline content
-        tmp_file=$(mktemp)
-        printf '%s' "$unreleased" > "$tmp_file"
-        
-        # Read it back and set as output
         delimiter="EOF_CHANGELOG"
-        printf '%s<<%s\n' "unreleased_entries<<$delimiter" "$delimiter" >> "$GITHUB_OUTPUT"
-        cat "$tmp_file" >> "$GITHUB_OUTPUT"
+        printf 'unreleased_entries<<%s\n' "$delimiter" >> "$GITHUB_OUTPUT"
+        go run ./cmd/vociferate --print-unreleased --root "$GITHUB_WORKSPACE" --changelog "$CHANGELOG" >> "$GITHUB_OUTPUT"
         printf '%s\n' "$delimiter" >> "$GITHUB_OUTPUT"
-        
-        rm -f "$tmp_file"
 
     - name: Validate changelog gate
       id: changelog-gate

internal/vociferate/vociferate.go

@@ -209,6 +209,12 @@ func RecommendedTag(rootDir string, options Options) (string, error) {
 	return defaultService().RecommendedTag(rootDir, options)
 }
 
+// UnreleasedBody returns the current Unreleased changelog body exactly as it
+// should appear in downstream tooling.
+func UnreleasedBody(rootDir string, options Options) (string, error) {
+	return defaultService().UnreleasedBody(rootDir, options)
+}
+
 // RecommendedTag returns the next semantic release tag based on current changelog state.
 func (s *Service) RecommendedTag(rootDir string, options Options) (string, error) {
 	resolved, err := resolveOptions(options)
@@ -265,6 +271,16 @@ func (s *Service) RecommendedTag(rootDir string, options Options) (string, error
 	return fmt.Sprintf("v%d.%d.%d", parsed.major, parsed.minor, parsed.patch), nil
 }
 
+// UnreleasedBody returns the current Unreleased changelog body.
+func (s *Service) UnreleasedBody(rootDir string, options Options) (string, error) {
+	resolved, err := resolveOptions(options)
+	if err != nil {
+		return "", err
+	}
+
+	return s.readUnreleasedBody(rootDir, resolved.Changelog)
+}
+
 func sectionHasEntries(unreleasedBody, sectionName string) bool {
 	heading := "### " + sectionName
 	sectionStart := strings.Index(unreleasedBody, heading)