github.com/vpayno/adventofcode-2022-golang-workspace@v0.0.0-20230605190011-dbafed5593de/scripts/git-release-notes

#!/bin/bash

declare mode="${1:-latest}"
declare release_message="${2:-}"

git_get_tags() {
	local tag="${1:-}"

	if [[ -z ${tag} ]]; then
		git tag | sort -Vr | grep -E '^v[[:digit:]]+[.][[:digit:]]+[.][[:digit:]]+$'
	else
		git tag | sort -Vr | grep -E '^v[[:digit:]]+[.][[:digit:]]+[.][[:digit:]]+$' | grep -A 1 "${tag}"
	fi
} # git_get_tags()

git_get_tag_previous() {
	local tag="${1:-}"

	git_get_tags "${tag}" | head -n 2 | tail -n 1
} # git_get_tag_previous()

git_get_tag_latest() {
	local tag="${1:-}"

	git_get_tags "${tag}" | head -n 1
} # git_get_tag_latest()

git_cl() {
	local tag="${1:-}"

	local tag_previous
	local tag_latest
	local git_ref

	if [[ ${tag} =~ ^v0.0.0\^$ ]]; then
		git_ref="${tag}"
	elif [[ ${tag} =~ ^release-(short|full:.*)$ ]]; then
		git_ref="$(git_get_tags | head -n 1)..HEAD"
	else
		tag_previous="$(git_get_tag_previous "${tag}")"
		tag_latest="$(git_get_tag_latest "${tag}")"

		git_ref="${tag_previous}..${tag_latest}"
	fi

	git log --pretty=format:'    - %s' --abbrev-commit --decorate "${git_ref}"
} # git_cl()

get_release_heading() {
	local tag="${1:-}"
	local mode="${2:-}"

	local heading_start="##"
	local heading_end=""

	if [[ ${mode%%:*} =~ ^all|release-full$ ]]; then
		heading_start="<h2>"
		heading_end="</h2>"
	fi

	if [[ ${tag%%:*} =~ ^release-short$ ]]; then
		printf "release: %s\n" "${release_message}"
		return
	elif [[ ${tag%%:*} =~ ^release-full$ ]]; then
		git log --pretty=format:"${heading_start} [%as] " --abbrev-commit --decorate -n 1 "${tag//release-*/HEAD}"
		printf "Release %s: %s\n%s\n" "${tag##*:}" "${release_message}" "${heading_end}"
		return
	fi

	git log --pretty=format:"${heading_start} [%as] " --abbrev-commit --decorate -n 1 "${tag//release-*/HEAD}"

	if [[ ${tag} == v0.0.0^ ]]; then
		printf "Release v0.0.0: initial release\n"
	else
		git_cl "${tag%%:*}" | head -n 1 | sed -r -e 's/^    - release: (v[[:digit:]]+[.][[:digit:]]+[.][[:digit:]]+) (- )?/Release \1: /g'
	fi

	printf "%s\n" "${heading_end}"
}

filter_commits() {
	grep -v -e 'Initial commit' -e 'Merge pull request'
} # filter_commits()

get_release_body() {
	local tag="${1:-}"

	local -a sections

	mapfile -t sections < <(git_cl "${tag}" | grep -v -E "^    - release: " | filter_commits | awk '{ print $2 }' | tr -d ":" | sort -Vu)

	for section in "${sections[@]}"; do
		printf "\n"
		printf -- "### %s\n" "${section,,}"
		printf "\n"
		git_cl "${tag}" | grep -v -E "^    - release: " | filter_commits | sort -k 2,2 -V | grep -- "- ${section}: " | sed -r -e 's/^    - [[:alpha:]].*: /- /g' | sort -V
	done
}

create_release_notes() {
	local mode="${1}"

	local first="true"
	local -a tags
	local open_fold_flag=" open"

	if [[ ${mode} == latest ]]; then
		mapfile -t tags < <(git_get_tag_latest)
	elif [[ ${mode} == release-short ]]; then
		mapfile -t tags < <(printf "%s\n" "${mode}")
	elif [[ ${mode%%:*} == release-full ]]; then
		printf "# %s Release Notes\n" '"Powerful Cli Applications in Go" Workspace'
		printf "\n"

		mapfile -t tags < <(printf "%s\n" "${mode}"; git_get_tags | sort -Vr)
	elif [[ ${mode} =~ ^v[0-9]+[.][0-9]+[.][0-9]+$ ]]; then
		if ! git tag | grep -q -E "^${mode##*:}$"; then
			printf "ERROR: tag [%s] doesn't exist!\n" "${mode}"
			exit 1
		fi

		mapfile -t tags < <(printf "%s\n" "${mode}")
	else
		printf "# %s Release Notes\n" '"Powerful Cli Applications in Go" Workspace'
		printf "\n"

		mapfile -t tags < <(git_get_tags | sort -Vr)
	fi

	for tag in "${tags[@]}"; do
		if [[ ${tag} == v0.0.0 ]]; then
			tag="${tag}^"
		fi

		if "${first}"; then
			first="false"
		else
			printf "\n"
		fi

		[[ ${mode} =~ ^all|release-full:v.*$ ]] && printf "<details%s>\n    <summary>\n" "${open_fold_flag}"
		get_release_heading "${tag}" "${mode}"
		[[ ${mode} =~ ^all|release-full:v.*$ ]] &&	printf "    </summary>\n"
		get_release_body "${tag}" "${mode}"
		[[ ${mode} =~ ^all|release-full:v.*$ ]] && printf "\n</details>\n"

		open_fold_flag=""
	done

	{
		printf "Running misspell -w CHANGELOG.md...\n"
		misspell -w CHANGELOG*.md
		printf "done\n"
	} 1>&2
} # create_release_notes()

if [[ ${mode} =~ ^(|latest|release-(short|full:v[0-9]+[.][0-9]+[.][0-9]+)|all|v[0-9]+[.][0-9]+[.][0-9]+)$ ]]; then
	create_release_notes "${mode}"
else
	printf "Usage: %s ^(|latest|release-(short|full:[0-9]+[.][0-9]+[.][0-9]+)|all|v[0-9]+[.][0-9]+[.][0-9]+)$\n" "$0"
	exit 1
fi