build: Add yarn changelog command (#7016)

Author: mydea

docs/publishing-a-release.md

@@ -17,10 +17,9 @@ _These steps are only relevant to Sentry employees when preparing and publishing
 ## Updating the Changelog
 
 1. Create a new branch.
-2. Run `git log --format="- %s"` and copy everything since the last release.
+2. Run `yarn changelog` and copy everything
 3. Create a new section in the changelog, deciding based on the changes whether it should be a minor bump or a patch release.
 4. Paste in the logs you copied earlier.
 5. Delete any which aren't user-facing changes.
-6. Alphabetize the rest.
 7. If any of the PRs are from external contributors, include underneath the commits `Work in this release contributed by <list of external contributors' GitHub usernames>. Thank you for your contributions!`. If there's only one external PR, don't forget to remove the final `s`. If there are three or more, use an Oxford comma. (It's in the Sentry styleguide!)
 8. Commit, push, and open a PR with the title `meta: Update changelog for <fill in relevant version here>` against `develop` branch.

package.json

@@ -19,6 +19,7 @@
     "clean:all": "run-p clean:build clean:caches clean:deps",
     "codecov": "codecov",
     "fix": "lerna run fix",
+    "changelog": "ts-node ./scripts/get-commit-list.ts",
     "link:yarn": "lerna exec yarn link",
     "lint": "lerna run lint",
     "lint:eslint": "lerna run lint:eslint",

scripts/get-commit-list.ts

@@ -0,0 +1,23 @@
+import { execSync } from 'child_process';
+
+function run(): void {
+  const commits = execSync('git log --format="- %s"').toString().split('\n');
+
+  const lastReleasePos = commits.findIndex(commit => commit.includes("Merge branch 'release"));
+
+  const newCommits = commits.splice(0, lastReleasePos).filter(commit => {
+    // Filter out master/develop merges
+    if (/Merge pull request #(\d+) from getsentry\/(master|develop)/.test(commit)) {
+      return false;
+    }
+
+    return true;
+  });
+
+  newCommits.sort((a, b) => a.localeCompare(b));
+
+  // eslint-disable-next-line no-console
+  console.log(newCommits.join('\n'));
+}
+
+run();