feat: include changelog content in GitHub releases

- Add extractChangelogSection() to parse CHANGELOG.md
- Extract version-specific changes and include in release notes
- Release notes now show 'What's Changed' section with actual changes

Author: omermorad

dist/index.js

@@ -84580,10 +84580,10 @@ var require_lodash = __commonJS({
           }
           return mapped.length && mapped[0] === arrays[0] ? baseIntersection(mapped, undefined2, comparator) : [];
         });
-        function join8(array, separator) {
+        function join9(array, separator) {
           return array == null ? "" : nativeJoin.call(array, separator);
         }
-        __name(join8, "join");
+        __name(join9, "join");
         function last(array) {
           var length = array == null ? 0 : array.length;
           return length ? array[length - 1] : undefined2;
@@ -86706,7 +86706,7 @@ var require_lodash = __commonJS({
         lodash.isUndefined = isUndefined;
         lodash.isWeakMap = isWeakMap;
         lodash.isWeakSet = isWeakSet;
-        lodash.join = join8;
+        lodash.join = join9;
         lodash.kebabCase = kebabCase;
         lodash.last = last;
         lodash.lastIndexOf = lastIndexOf;
@@ -131400,6 +131400,35 @@ function renderReleaseNotes(input) {
   return md;
 }
 __name(renderReleaseNotes, "renderReleaseNotes");
+function extractChangelogSection(contractName, version, changelogPath = path.join(process.cwd(), "CHANGELOG.md")) {
+  if (!fs.existsSync(changelogPath)) {
+    return "";
+  }
+  try {
+    const content = fs.readFileSync(changelogPath, "utf-8");
+    const headerRegex = new RegExp(
+      `^## \\[${escapeRegex2(contractName)}\\] v${escapeRegex2(version)} - .*$`,
+      "gm"
+    );
+    const match = headerRegex.exec(content);
+    if (!match) {
+      return "";
+    }
+    const startIndex = match.index + match[0].length;
+    const restOfContent = content.slice(startIndex);
+    const nextSectionMatch = /^##\s/m.exec(restOfContent);
+    const endIndex = nextSectionMatch ? nextSectionMatch.index : restOfContent.length;
+    const section = restOfContent.slice(0, endIndex).trim();
+    return section;
+  } catch (error2) {
+    return "";
+  }
+}
+__name(extractChangelogSection, "extractChangelogSection");
+function escapeRegex2(str) {
+  return str.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
+}
+__name(escapeRegex2, "escapeRegex");
 
 // src/modes/release.ts
 var CHANGESETS_PATH = ".contractual/changesets";
@@ -131532,12 +131561,12 @@ async function handlePostRelease(octokit, context3, config, mergeInfo, inputs) {
     }
     if (inputs.createReleases) {
       try {
+        const changes = extractChangelogSection(contractName, newVersion);
         const releaseNotes = renderReleaseNotes({
           contractName,
           oldVersion,
           newVersion,
-          changes: "",
-          // TODO: Extract from merged PR body
+          changes,
           bumpType: detectBumpType(oldVersion, newVersion)
         });
         const release = await createRelease(octokit, context3, {

dist/index.js.map

@@ -0,0 +1,60 @@
+import { readFileSync, existsSync } from 'node:fs';
+import { join } from 'node:path';
+
+/**
+ * Extract changelog section for a specific contract version
+ *
+ * @param contractName - Name of the contract
+ * @param version - Version to extract (e.g., "2.1.0")
+ * @param changelogPath - Path to CHANGELOG.md (defaults to ./CHANGELOG.md)
+ * @returns Changelog content for this version, or empty string if not found
+ */
+export function extractChangelogSection(
+  contractName: string,
+  version: string,
+  changelogPath: string = join(process.cwd(), 'CHANGELOG.md')
+): string {
+  // Check if changelog exists
+  if (!existsSync(changelogPath)) {
+    return '';
+  }
+
+  try {
+    const content = readFileSync(changelogPath, 'utf-8');
+
+    // Find the section header for this version
+    // Format: ## [contractName] v{version} - {date}
+    const headerRegex = new RegExp(
+      `^## \\[${escapeRegex(contractName)}\\] v${escapeRegex(version)} - .*$`,
+      'gm'
+    );
+
+    const match = headerRegex.exec(content);
+    if (!match) {
+      return '';
+    }
+
+    // Extract content from after the header until the next ## header
+    const startIndex = match.index + match[0].length;
+    const restOfContent = content.slice(startIndex);
+
+    // Find next section (starts with ##)
+    const nextSectionMatch = /^##\s/m.exec(restOfContent);
+    const endIndex = nextSectionMatch ? nextSectionMatch.index : restOfContent.length;
+
+    // Extract and clean the section content
+    const section = restOfContent.slice(0, endIndex).trim();
+
+    return section;
+  } catch (error) {
+    // If reading fails, return empty string
+    return '';
+  }
+}
+
+/**
+ * Escape special regex characters
+ */
+function escapeRegex(str: string): string {
+  return str.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}

src/lib/changelog.ts

@@ -25,6 +25,7 @@ import {
 } from '../github/releases.js';
 import { renderVersionPRBody } from '../render/version-pr.js';
 import { renderReleaseNotes } from '../render/release-notes.js';
+import { extractChangelogSection } from '../lib/changelog.js';
 import type { ActionInputs, ChangesetFile, ResolvedConfig } from '../types.js';
 
 /** Full path to changesets directory */
@@ -235,11 +236,14 @@ async function handlePostRelease(
     // Create GitHub Release
     if (inputs.createReleases) {
       try {
+        // Extract changelog section for this version
+        const changes = extractChangelogSection(contractName, newVersion);
+
         const releaseNotes = renderReleaseNotes({
           contractName,
           oldVersion,
           newVersion,
-          changes: '', // TODO: Extract from merged PR body
+          changes,
           bumpType: detectBumpType(oldVersion, newVersion),
         });