Add automated release workflow (#1572)

Author: Pessimistress

.github/workflows/release.yml

@@ -0,0 +1,36 @@
+name: release
+
+on:
+  push:
+    tags:
+      - v*
+
+jobs:
+  release-notes:
+    runs-on: ubuntu-latest
+
+    if: github.repository_owner == 'visgl'
+
+    env:
+      ADMIN_TOKEN: ${{ secrets.ADMIN_TOKEN }}
+
+    steps:
+      - uses: actions/[email protected]
+
+      - name: Get git tags (https://github.com/actions/checkout/issues/206)
+        run: git fetch --tags -f
+
+      - name: Use Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: '12.x'
+
+      - name: Publish release
+        run: |
+          body=$(node scripts/github-release.js) &&
+          curl \
+            -X POST \
+            -H "Accept: application/vnd.github.v3+json" \
+            https://api.github.com/repos/visgl/react-map-gl/releases \
+            -d "${body}" \
+            -H "Authorization: token ${ADMIN_TOKEN}"

scripts/github-release.js

@@ -0,0 +1,53 @@
+const {execSync} = require('child_process');
+const {readFileSync} = require('fs');
+
+// Get the latest tag
+const tag = getGitTag();
+if (!tag) {
+  console.error('TAG NOT FOUND');
+  process.exit(1);
+}
+
+// Parse changelog
+const changelog = getReleaseNotes(tag);
+if (!changelog) {
+  console.error('CHANGELOG NOT FOUND');
+  process.exit(1);
+}
+
+// Publish release notes to GitHub
+// https://docs.github.com/en/rest/reference/repos#create-a-release
+const requestBody = {
+  tag_name: tag,
+  name: tag,
+  body: changelog,
+  prerelease: tag.search(/alpha|beta|rc/) > 0
+};
+
+console.log(JSON.stringify(requestBody));
+
+function getGitTag() {
+  try {
+    return execSync('git describe --exact-match HEAD', {
+      stdio: [null, 'pipe', null],
+      encoding: 'utf-8'
+    }).trim();
+  } catch (err) {
+    // not tagged
+    return null;
+  }
+}
+
+function getReleaseNotes(version) {
+  let changelog = readFileSync('CHANGELOG.md', 'utf-8');
+  const header = changelog.match(new RegExp(`^##.*\\b${version.replace('v', '')}\\b.*$`, 'm'));
+  if (!header) {
+    return null;
+  }
+  changelog = changelog.slice(header.index + header[0].length);
+  const endIndex = changelog.search(/^#/m);
+  if (endIndex > 0) {
+    changelog = changelog.slice(0, endIndex);
+  }
+  return changelog.trim();
+}