workflows: add workflow for posting release information on PR merge

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
2022-11-18 23:12:22 +01:00
parent b1af1205cd
commit 4c9a407e16
2 changed files with 178 additions and 0 deletions
@@ -0,0 +1,115 @@
+#!/usr/bin/env node
+/*
+ * Copyright 2022 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+const { execFile: execFileCb } = require('child_process');
+const { promisify } = require('util');
+const { resolve: resolvePath } = require('path');
+
+const execFile = promisify(execFileCb);
+
+async function hasNewChangesets(ref) {
+  if (!ref) {
+    throw new Error('ref is required');
+  }
+
+  const { stdout } = await execFile('git', [
+    'diff',
+    '--compact-summary',
+    ref,
+    '.changeset/*.md',
+  ]);
+  return stdout.includes('(new)');
+}
+
+function getReleaseOfMonth(year, month) {
+  const base = new Date(Date.UTC(year, month));
+  const wednesdayOffset =
+    base.getUTCDay() > 3 ? 10 - base.getUTCDay() : 3 - base.getUTCDay();
+  const thirdWednesdayOffset = wednesdayOffset + 7 * 2;
+  const releaseOffset = thirdWednesdayOffset - 1;
+  const releaseDay = new Date(
+    Date.UTC(base.getUTCFullYear(), base.getUTCMonth(), releaseOffset + 1),
+  );
+  return releaseDay;
+}
+
+function getReleaseSchedule() {
+  const firstReleaseYear = 2022;
+  const firstReleaseMonth = 2;
+
+  return Array(100)
+    .fill(0)
+    .map((_, i) => {
+      const date = getReleaseOfMonth(firstReleaseYear, firstReleaseMonth + i);
+      return { version: `1.${i}.0`, date };
+    });
+}
+
+function getCurrentRelease() {
+  const { version: releaseVersion } = require(resolvePath('package.json'));
+
+  const match = releaseVersion.match(/^(\d+\.\d+\.\d+)/);
+  if (!match) {
+    throw new Error(`Failed to parse release version, '${releaseVersion}'`);
+  }
+  const [versionStr] = match;
+  if (versionStr === releaseVersion) {
+    return releaseVersion;
+  }
+  const [major, minor] = versionStr.split('.').map(Number);
+  return `${major}.${minor - 1}.0`;
+}
+
+function findNextRelease(currentRelease, releaseSchedule) {
+  const currentIndex = releaseSchedule.findIndex(
+    r => r.version === currentRelease,
+  );
+  if (currentIndex === -1) {
+    throw new Error(
+      `Failed to find current release '${currentRelease}' in release schedule`,
+    );
+  }
+
+  return releaseSchedule[currentIndex + 1];
+}
+
+async function main() {
+  const [diffRef = 'origin/master'] = process.argv.slice(2);
+  const needsMessage = await hasNewChangesets(diffRef);
+  if (!needsMessage) {
+    return;
+  }
+
+  const currentRelease = getCurrentRelease();
+  const releaseSchedule = getReleaseSchedule();
+  const nextRelease = findNextRelease(currentRelease, releaseSchedule);
+
+  const scheduledDate = nextRelease.date
+    .toUTCString()
+    .replace(/\s*\d+:\d+:\d+.*/, '');
+  process.stdout.write(
+    [
+      'Thank you for contributing to Backstage! The changes in this pull request will be part',
+      `of the \`${nextRelease.version}\` release, scheduled for ${scheduledDate}.`,
+    ].join(' '),
+  );
+}
+
+main().catch(error => {
+  console.error(error.stack);
+  process.exit(1);
+});