chore: create release script (#612)

Author: Jochum van der Ploeg

tool/release_ready.sh

@@ -0,0 +1,85 @@
+# Ensures that the package or brick is ready for a release.
+# 
+# Will update the version.dart file and update the CHANGELOG.md.
+#
+# Set it up for a new version:
+# `./release_ready.sh <version>
+
+# Check if current directory has a pubspec.yaml, if so we assume it is correctly set up.
+if [ ! -f "pubspec.yaml" ] && [ ! -f "brick.yaml" ]; then
+  echo "$(pwd) is not a valid package or brick."
+  exit 1
+fi
+
+currentBranch=$(git symbolic-ref --short -q HEAD)
+if [[ ! $currentBranch == "main" ]]; then
+  echo "Releasing is only supported on the main branch."
+  exit 1
+fi
+
+# Get information
+old_version=""
+current_name=""
+if [ -f "pubspec.yaml" ]; then
+  old_version=$(dart pub deps --json | pcregrep -o1 -i '"version": "(.*?)"' | head -1)
+  current_name=$(dart pub deps --json | pcregrep -o1 -i '"name": "(.*?)"' | head -1)
+elif [ -f "brick.yaml" ]; then
+  old_version=$(cat brick.yaml | pcregrep 'version: (.*?)' | tr " " "\n" | tail -1)
+  current_name=$(cat brick.yaml | pcregrep 'name: (.*?)' | tr " " "\n" | tail -1)
+fi
+
+if [ -z "$old_version" ] || [ -z "$current_name" ]; then
+  echo "Current version or name was not resolved."
+  exit 1
+fi
+
+# Get new version
+new_version="$1";
+
+if [[ "$new_version" == "" ]]; then 
+  echo "No new version supplied, please provide one"
+  exit 1
+fi
+
+if [[ "$new_version" == "$old_version" ]]; then
+  echo "Current version is $old_version, can't update."
+  exit 1
+fi
+
+# Retrieving all the commits in the current directory since the last tag.
+previousTag="${current_name}-v${old_version}"
+raw_commits="$(git log --pretty=format:"%s" --no-merges --reverse $previousTag..HEAD -- .)"
+markdown_commits=$(echo "$raw_commits" | sed -En "s/\(#([0-9]+)\)/([#\1](https:\/\/github.com\/VeryGoodOpenSource\/dart_frog\/pull\/\1))/p")
+
+if [[ "$markdown_commits" == "" ]]; then
+  echo "No commits since last tag, can't update."
+  exit 0
+fi
+commits=$(echo "$markdown_commits" | sed -En "s/^/- /p")
+
+echo "Updating version to $new_version"
+sed -i '' "s/version: $old_version/version: $new_version/g" pubspec.yaml
+
+# Update dart file with new version.
+dart run build_runner build --delete-conflicting-outputs > /dev/null
+
+if grep -q $new_version "CHANGELOG.md"; then
+  echo "CHANGELOG already contains version $new_version."
+  exit 1
+fi
+
+# Add a new version entry with the found commits to the CHANGELOG.md.
+echo "# ${new_version}\n\n${commits}\n\n$(cat CHANGELOG.md)" > CHANGELOG.md
+echo "CHANGELOG for $current_name generated, validate entries here: $(pwd)/CHANGELOG.md"
+
+echo "Creating git branch for $current_name@$new_version"
+git checkout -b "chore($current_name)/$new_version" > /dev/null
+
+git add pubspec.yaml CHANGELOG.md 
+if [ -f lib/version.dart ]; then
+  git add lib/version.dart
+fi
+
+echo ""
+echo "Run the following command if you wish to commit the changes:"
+echo "git commit -m \"chore($current_name): $new_version\""