From dac53e019ff9e5c6b1845b16b5dde0a563bb16e4 Mon Sep 17 00:00:00 2001
From: Di Wu <diwud@amazon.com>
Date: Wed, 2 Oct 2024 17:43:27 -0700
Subject: [PATCH] ci: add step to auto generate changelog in kickoff PR

---
 .github/scripts/group-commit-message.awk | 25 ++++++++++++++++++++
 .github/workflows/kick-off-release.yaml  | 30 +++++++++++++++++++++++-
 2 files changed, 54 insertions(+), 1 deletion(-)
 create mode 100755 .github/scripts/group-commit-message.awk

diff --git a/.github/scripts/group-commit-message.awk b/.github/scripts/group-commit-message.awk
new file mode 100755
index 0000000..f5d45c8
--- /dev/null
+++ b/.github/scripts/group-commit-message.awk
@@ -0,0 +1,25 @@
+#!/usr/bin/awk -f
+
+function add_to_group(key, value) {
+    groups[key] = groups[key] "- " value "\n"
+}
+
+{
+    if (NF > 0) {  # Skip empty lines
+        if (tolower($1) == "feat:") {
+            add_to_group("Features:", substr($0, index($0, $2)))
+        } else if (tolower($1) == "fix:") {
+            add_to_group("Fixes:", substr($0, index($0, $2)))
+        } else {
+            next
+        }
+    }
+}
+
+END {
+    for (group in groups) {
+        print "\n### " group
+        print groups[group]
+    }
+    print "\n"
+}
diff --git a/.github/workflows/kick-off-release.yaml b/.github/workflows/kick-off-release.yaml
index 9634ac6..61b450f 100644
--- a/.github/workflows/kick-off-release.yaml
+++ b/.github/workflows/kick-off-release.yaml
@@ -43,7 +43,7 @@ jobs:
       - name: Checkout Code
         uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
         with:
-          ref: main
+          fetch-depth: 0
 
       - name: Bump versions to ${{ env.RELEASE_VERSION }}
         run: |
@@ -56,6 +56,34 @@ jobs:
           git push origin HEAD
         shell: bash
 
+      - name: Generate CHANGELOG
+        env:
+          RELEASE_VERSION: ${{ github.event.inputs.release-version }}
+        shell: bash
+        run: |
+          LOGS=$(git log --pretty=format:%s origin/release..HEAD | awk -F '\n' '{print $1}')
+          GROUPED_LOGS=$(echo $LOGS | ./.github/scripts/group-commit-message.awk)
+          awk -v date=$(date +"%Y-%m-%d") \
+            -v version="$RELEASE_VERSION" '
+            NR == 2 {
+                print "\n"
+                print "## " version " - (" date ")"
+                while (getline line < "/dev/stdin") {
+                    print line
+                }
+                next
+            }
+            {print}
+          ' CHANGELOG.md < <(echo "$GROUPED_LOGS") > temp && mv temp CHANGELOG.md
+
+      - name: Create CHANGELOG commit
+        env:
+          RELEASE_VERSION: ${{ github.event.inputs.release-version }}
+        run: |
+          git add CHANGELOG.md
+          git commit -m "chore: update CHANGELOG for $RELEASE_VERSION"
+          git push origin HEAD
+
       - name: Create Pull Request
         env:
           GH_TOKEN: ${{ github.token }}