From 8749e830fbba86345b24e2cb2827c5bc23d31200 Mon Sep 17 00:00:00 2001
From: Justin D'Errico <justin.derrico1991@gmail.com>
Date: Fri, 1 Apr 2022 17:48:27 -0400
Subject: [PATCH] Do some YAML magic extraordinaire to rewrite the changelog
 (#108)

---
 .github/workflows/release.yml | 37 +++++++++++++++++++++--------------
 scripts/rewrite-changelog.js  | 27 +++++++++++++++++++++++++
 2 files changed, 49 insertions(+), 15 deletions(-)
 create mode 100644 scripts/rewrite-changelog.js

diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 4184a1e46..5918d54cc 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -12,8 +12,8 @@ jobs:
     name: Release
     runs-on: ubuntu-latest
     outputs:
-      release_id: ${{ steps.persist_release.outputs.release_id }}
       released: ${{ steps.persist_release.outputs.released }}
+      changelog: ${{ steps.persist_release.outputs.changelog }}
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
@@ -48,10 +48,28 @@ jobs:
         env:
           NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
 
-      - id: persist_release
+      - name: Fetch Release
+        if: steps.release.outputs.released == 'true'
+        uses: cardinalby/git-get-release-action@v1
+        id: fetch_release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          releaseId: ${{ steps.release.outputs.release_id }}
+
+      - name: Output Release Changelog
+        if: steps.release.outputs.released == 'true'
+        run: echo "${{ steps.fetch_release.outputs.body }}"
+
+      - name: Persist Release
+        if: steps.release.outputs.released == 'true'
+        id: persist_release
+        env:
+          RAW_CHANGELOG: ${{ steps.fetch_release.outputs.body }}
+          REPO_URL: ${{ github.repositoryUrl }}
         run: |
-          echo "::set-output name=release_id::${{ steps.release.outputs.release_id }}"
           echo "::set-output name=released::${{ steps.release.outputs.released }}"
+          echo "::set-output name=changelog::$(node ./scripts/rewrite-changelog.js RAW_CHANGELOG $REPO_URL)"
 
   bump_zapper_studio:
     name: Bump on Zapper API
@@ -70,17 +88,6 @@ jobs:
           token: ${{ secrets.GH_ZAPPER_BOT }}
           ref: master
 
-      - name: Output Release ID
-        run: echo "Release ID ${{ needs.release.outputs.release_id }}"
-
-      - name: Fetch Release
-        uses: cardinalby/git-get-release-action@v1
-        id: fetch_release
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        with:
-          releaseId: ${{ needs.release.outputs.release_id }}
-
       - name: Setup Node
         uses: actions/setup-node@v2
         with:
@@ -112,6 +119,6 @@ jobs:
           body: |
             ⚙️ _This pull request was opened automatically from Zapper-fi/studio._
 
-            ${{ steps.fetch_release.outputs.body }}
+            ${{ needs.release.outputs.changelog }}
           base: master
           delete-branch: true
diff --git a/scripts/rewrite-changelog.js b/scripts/rewrite-changelog.js
new file mode 100644
index 000000000..c8d83b2c0
--- /dev/null
+++ b/scripts/rewrite-changelog.js
@@ -0,0 +1,27 @@
+const [envVarTarget, repoUrl] = process.argv.slice(2);
+
+function run() {
+  const rawChangelog = process.env[envVarTarget];
+  const prSectionExpr = /.*(\(#(\d.*)\))$/;
+
+  const lines = rawChangelog.split('\n');
+  const rewrittenLines = lines
+    .map(line => {
+      try {
+        // In commit `whatever (#234)`, extract `(#234)` and `234`
+        const [, prSection, prNumber] = prSectionExpr.exec(line);
+        // Rewrite line using a URL of the pull request rather than just `(#234)`
+        const [lineStart] = line.split(prSection);
+        const rewrittenPrSection = `(${repoUrl}/pull/${prNumber})`;
+        return [lineStart, rewrittenPrSection].join('');
+      } catch (e) {
+        return line;
+      }
+    })
+    .join('\n');
+
+  /* eslint-disable-next-line no-console */
+  console.log(rewrittenLines);
+}
+
+run();