From b299f98161a02fe335c7e06ff4c93ce8fc24137a Mon Sep 17 00:00:00 2001
From: Muhammad Atif Ali <atif@coder.com>
Date: Tue, 13 Feb 2024 15:23:44 +0300
Subject: [PATCH] ci: automate version bumps in module README.md files (#139)

Co-authored-by: Mathias Fredriksson <mafredri@gmail.com>
---
 .github/workflows/update-readme.yaml | 41 ++++++++++++++++++++++++++++
 update-version.sh                    | 37 +++++++++++++++++--------
 2 files changed, 67 insertions(+), 11 deletions(-)
 create mode 100644 .github/workflows/update-readme.yaml

diff --git a/.github/workflows/update-readme.yaml b/.github/workflows/update-readme.yaml
new file mode 100644
index 0000000..ffda695
--- /dev/null
+++ b/.github/workflows/update-readme.yaml
@@ -0,0 +1,41 @@
+name: Update README on Tag
+
+on:
+  workflow_dispatch:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  update-readme:
+    permissions:
+      contents: read
+      pull-requests: write
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Get the latest tag
+        id: get-latest-tag
+        run: echo "TAG=$(git describe --tags --abbrev=0 | sed 's/^v//')" >> $GITHUB_OUTPUT
+
+      - name: Run update script
+        run: ./update-version.sh
+
+      - name: Create Pull Request
+        id: create-pr
+        uses: peter-evans/create-pull-request@v5
+        with:
+          commit-message: 'chore: bump version to ${{ env.TAG }} in README.md files'
+          title: 'chore: bump version to ${{ env.TAG }} in README.md files'
+          body: 'This is an auto-generated PR to update README.md files of all modules with the new tag ${{ env.TAG }}'
+          branch: 'update-readme-branch'
+        env:
+          TAG: ${{ steps.get-latest-tag.outputs.TAG }}
+
+      - name: Auto-approve
+        uses: hmarr/auto-approve-action@v4
+        if: github.ref == 'refs/heads/update-readme-branch'
diff --git a/update-version.sh b/update-version.sh
index 2fadb57..433f614 100755
--- a/update-version.sh
+++ b/update-version.sh
@@ -6,16 +6,31 @@
 
 set -euo pipefail
 
-LATEST_TAG=$(git describe --abbrev=0 --tags | sed 's/^v//') || exit $?
+current_tag=$(git describe --tags --abbrev=0)
+previous_tag=$(git describe --tags --abbrev=0 $current_tag^)
+mapfile -t changed_files < <(git diff --name-only "$previous_tag" "$current_tag" | xargs dirname | sort -u | grep -v '^\.')
 
-find . -name README.md | while read -r file; do
-  tmpfile=$(mktemp /tmp/tempfile.XXXXXX)
-  awk -v tag="$LATEST_TAG" '{
-    if ($1 == "version" && $2 == "=") {
-      sub(/"[^"]*"/, "\"" tag "\"")
-      print
-    } else {
-      print
-    }
-  }' "$file" > "$tmpfile" && mv "$tmpfile" "$file"
+changed_dirs=()
+for file in $changed_files; do
+  dir=$(dirname "$file")
+  changed_dirs+=("$dir")
 done
+changed_dirs=($(printf "%s\n" "${changed_dirs[@]}" | sort -u))
+
+LATEST_TAG=$(git describe --abbrev=0 --tags | sed 's/^v//') || exit $?
+
+for dir in "${changed_dirs[@]}"; do
+  if [[ -f "$dir/README.md" ]]; then
+    echo "Bumping version in $dir/README.md"
+    file="$dir/README.md"
+    tmpfile=$(mktemp /tmp/tempfile.XXXXXX)
+    awk -v tag="$LATEST_TAG" '{
+      if ($1 == "version" && $2 == "=") {
+        sub(/"[^"]*"/, "\"" tag "\"")
+        print
+      } else {
+        print
+      }
+    }' "$file" > "$tmpfile" && mv "$tmpfile" "$file"
+  fi
+done
\ No newline at end of file