Update release script

script/release

@@ -1,59 +1,126 @@
 #!/bin/bash
 
+# Exit early
+# See: https://www.gnu.org/savannah-checkouts/gnu/bash/manual/bash.html#The-Set-Builtin
+set -e
+
 # About:
 #
 # This is a helper script to tag and push a new release. GitHub Actions use
 # release tags to allow users to select a specific version of the action to use.
 #
 # See: https://github.com/actions/typescript-action#publishing-a-new-release
+# See: https://github.com/actions/toolkit/blob/master/docs/action-versioning.md#recommendations
 #
 # This script will do the following:
 #
-# 1. Get the latest release tag
-# 2. Prompt the user for a new release tag
-# 3. Tag the new release
-# 4. Push the new tag to the remote
+# 1. Retrieve the latest release tag
+# 2. Display the latest release tag
+# 3. Prompt the user for a new release tag
+# 4. Validate the new release tag
+# 5. Remind user to update the version field in package.json
+# 6. Tag a new release
+# 7. Set 'is_major_release' variable
+# 8. Point separate major release tag (e.g. v1, v2) to the new release
+# 9. Push the new tags (with commits, if any) to remote
+# 10. If this is a major release, create a 'releases/v#' branch and push
 #
 # Usage:
 #
 # script/release
 
+# Variables
+semver_tag_regex='v[0-9]+\.[0-9]+\.[0-9]+$'
+semver_tag_glob='v[0-9].[0-9].[0-9]*'
+git_remote='origin'
+major_semver_tag_regex='\(v[0-9]*\)'
+
 # Terminal colors
 OFF='\033[0m'
-RED='\033[0;31m'
-GREEN='\033[0;32m'
-BLUE='\033[0;34m'
-
-# Get the latest release tag
-latest_tag=$(git describe --tags "$(git rev-list --tags --max-count=1)")
+BOLD_RED='\033[1;31m'
+BOLD_GREEN='\033[1;32m'
+BOLD_BLUE='\033[1;34m'
+BOLD_PURPLE='\033[1;35m'
+BOLD_UNDERLINED='\033[1;4m'
+BOLD='\033[1m'
 
-if [[ -z "$latest_tag" ]]; then
+# 1. Retrieve the latest release tag
+if ! latest_tag=$(git describe --abbrev=0 --match="$semver_tag_glob"); then
 	# There are no existing release tags
 	echo -e "No tags found (yet) - Continue to create and push your first tag"
 	latest_tag="[unknown]"
 fi
 
-# Display the latest release tag
-echo -e "The latest release tag is: ${BLUE}${latest_tag}${OFF}"
+# 2. Display the latest release tag
+echo -e "The latest release tag is: ${BOLD_BLUE}${latest_tag}${OFF}"
 
-# Prompt the user for the new release tag
+# 3. Prompt the user for a new release tag
 read -r -p 'Enter a new release tag (vX.X.X format): ' new_tag
 
-# Validate the new release tag
-tag_regex='v[0-9]+\.[0-9]+\.[0-9]+$'
-if echo "$new_tag" | grep -q -E "$tag_regex"; then
-	echo -e "Tag: ${BLUE}$new_tag${OFF} is valid"
+# 4. Validate the new release tag
+if echo "$new_tag" | grep -q -E "$semver_tag_regex"; then
+	# Release tag is valid
+	echo -e "Tag: ${BOLD_BLUE}$new_tag${OFF} is valid syntax"
 else
-	# Release tag is not `vX.X.X` format
-	echo -e "Tag: ${BLUE}$new_tag${OFF} is ${RED}not valid${OFF} (must be in vX.X.X format)"
+	# Release tag is not in `vX.X.X` format
+	echo -e "Tag: ${BOLD_BLUE}$new_tag${OFF} is ${BOLD_RED}not valid${OFF} (must be in ${BOLD}vX.X.X${OFF} format)"
+	exit 1
+fi
+
+# 5. Remind user to update the version field in package.json
+echo -e -n "Make sure the version field in package.json is ${BOLD_BLUE}$new_tag${OFF}. Yes? [Y/${BOLD_UNDERLINED}n${OFF}] "
+read -r YN
+
+if [[ ! ($YN == "y" || $YN == "Y") ]]; then
+	# Package.json version field is not up to date
+	echo -e "Please update the package.json version to ${BOLD_PURPLE}$new_tag${OFF} and commit your changes"
 	exit 1
 fi
 
-# Tag the new release
-git tag -a "$new_tag" -m "$new_tag Release"
-echo -e "${GREEN}Tagged: $new_tag${OFF}"
+# 6. Tag a new release
+git tag "$new_tag" --annotate --message "$new_tag Release"
+echo -e "Tagged: ${BOLD_GREEN}$new_tag${OFF}"
+
+# 7. Set 'is_major_release' variable
+latest_major_release_tag=$(expr "$latest_tag" : "$major_semver_tag_regex")
+new_major_release_tag=$(expr "$new_tag" : "$major_semver_tag_regex")
+
+if ! [[ "$new_major_release_tag" = "$latest_major_release_tag" ]]; then
+	is_major_release='yes'
+else
+	is_major_release='no'
+fi
+
+# 8. Point separate major release tag (e.g. v1, v2) to the new release
+if [ $is_major_release = 'yes' ]; then
+	# Create a new major verison tag and point it to this release
+	git tag "$new_major_release_tag" --annotate --message "$new_major_release_tag Release"
+	echo -e "New major version tag: ${BOLD_GREEN}$new_major_release_tag${OFF}"
+else
+	# Update the major verison tag to point it to this release
+	git tag "$latest_major_release_tag" --force --annotate --message "Sync $latest_major_release_tag tag with $new_tag"
+	echo -e "Synced ${BOLD_GREEN}$latest_major_release_tag${OFF} with ${BOLD_GREEN}$new_tag${OFF}"
+fi
+
+# 9. Push the new tags (with commits, if any) to remote
+git push --follow-tags
+
+if [ $is_major_release = 'yes' ]; then
+	# New major version tag is pushed with the '--follow-tags' flags
+	echo -e "Tags: ${BOLD_GREEN}$new_major_release_tag${OFF} and ${BOLD_GREEN}$new_tag${OFF} pushed to remote"
+else
+	# Force push the updated major version tag
+	git push $git_remote "$latest_major_release_tag" --force
+	echo -e "Tags: ${BOLD_GREEN}$latest_major_release_tag${OFF} and ${BOLD_GREEN}$new_tag${OFF} pushed to remote"
+fi
+
+# 10. If this is a major release, create a 'releases/v#' branch and push
+if [ $is_major_release = 'yes' ]; then
+	git branch "releases/$latest_major_release_tag" "$latest_major_release_tag"
+	echo -e "Branch: ${BOLD_BLUE}releases/$latest_major_release_tag${OFF} created from ${BOLD_BLUE}$latest_major_release_tag${OFF} tag"
+	git push --set-upstream $git_remote "releases/$latest_major_release_tag"
+	echo -e "Branch: ${BOLD_GREEN}releases/$latest_major_release_tag${OFF} pushed to remote"
+fi
 
-# Push the new tag to the remote
-git push --tags
-echo -e "${GREEN}Release tag pushed to remote${OFF}"
-echo -e "${GREEN}Done!${OFF}"
+# Completed
+echo -e "${BOLD_GREEN}Done!${OFF}"