lib.sh

#!/bin/bash

_is_automated_event() {
	AUTOFIX_EVENTS=${AUTOFIX_EVENTS:-push}

	if [[ ${GITHUB_EVENT_NAME} =~ ^($AUTOFIX_EVENTS)$ ]]; then
		return 0
	fi

	return 1
}

_requires_token() {
	if [[ -z $GITHUB_TOKEN ]]; then
		echo "Set the GITHUB_TOKEN env variable."
		exit 1
	fi
}

_should_fix_issue() {
	pr_url="$(jq --raw-output '.issue.pull_request.url | select(. != null)' "$GITHUB_EVENT_PATH")"
	fix_comment="$(jq --raw-output ".comment.body | select(. | startswith(\"$1\"))" "$GITHUB_EVENT_PATH")"
	[[ -n $pr_url ]] && [[ -n $fix_comment ]] || exit 0
}

__switch_to_branch() {
	# TODO: Not working yet
	remote_branch_name=$(git name-rev --name-only "${GITHUB_SHA}")
	git checkout -b "${remote_branch_name#remotes/origin}" --track "$remote_branch_name"
}

_should_fix_review() {
	fix_comment="$(jq --raw-output ".review.body | select(. | startswith(\"$1\"))" "$GITHUB_EVENT_PATH")"
	[[ -n $fix_comment ]] || exit 0
}

_git_is_dirty() {
	[[ -n "$(git status -s)" ]]
}

_git_changed_files() {
	local -r base_ref="$(jq --raw-output '.base_ref // "origin/" + (.pull_request.base.ref // "master")' "${GITHUB_EVENT_PATH}")"

	git --no-pager diff "${base_ref}" --name-only
}

_local_commit() {
	git config --global user.name "github-actions[bot]"
	git config --global user.email "github-actions[bot]@users.noreply.github.com"
	git add .
	git commit -m "${GITHUB_ACTION}: lint fix"
}

_remote_commit() {
	tmp_file="$(mktemp)"

	# shellcheck disable=SC2034  # Unused variables left for readability
	while read -r _src_mode dst_mode _src_sha dst_sha flag path; do
		file_payload="$(mktemp)"
		echo "{\"encoding\": \"base64\", \"content\": \"$(base64 "$path" | tr -d '\n')\"}" >"$file_payload"
		file_response=$(curl --fail -H "Authorization: token ${GITHUB_TOKEN}" \
			-d @"$file_payload" \
			"https://api.github.com/repos/${GITHUB_REPOSITORY}/git/blobs")
		echo "{ \"mode\": \"${dst_mode}\", \"path\": \"${path}\", \"sha\": $(jq '.sha' <<<"$file_response")}" >>"$tmp_file"
	done < <(git diff-files)

	head_response="$(curl --fail -H "Authorization: token ${GITHUB_TOKEN}" \
		-X GET \
		"https://api.github.com/repos/${GITHUB_REPOSITORY}/git/${GITHUB_REF}")"
	head_sha="$(jq '.object.sha' <<<"$head_response")"

	tree_payload="{\"base_tree\": ${head_sha}, \"tree\": $(jq -s '.' "$tmp_file")}"
	tree_response="$(curl --fail -H "Authorization: token ${GITHUB_TOKEN}" \
		-d "$tree_payload" \
		"https://api.github.com/repos/${GITHUB_REPOSITORY}/git/trees")"

	commit_payload="{\"message\": \"${GITHUB_ACTION}: lint fix\", \"tree\": $(jq '.sha' <<<"$tree_response"), \"parents\": [${head_sha}]}"
	commit_response="$(curl --fail -H "Authorization: token ${GITHUB_TOKEN}" \
		-d "$commit_payload" \
		"https://api.github.com/repos/${GITHUB_REPOSITORY}/git/commits")"

	update_branch_payload="{\"sha\": $(jq '.sha' <<<"$commit_response")}"
	# shellcheck disable=SC2034  # Unused variables left for readability
	update_branch_response="$(curl --fail -H "Authorization: token ${GITHUB_TOKEN}" \
		-d "$update_branch_payload" \
		-X PATCH \
		"https://api.github.com/repos/${GITHUB_REPOSITORY}/git/${GITHUB_REF}")"

}

_commit_if_needed() {
	if _git_is_dirty; then
		_remote_commit
		_local_commit
	fi
}

_lint_and_fix_action() {
	if _is_automated_event; then
		if [[ ${2:-} == "autofix" ]]; then
			_requires_token
			fix "${@:3}"
			_commit_if_needed
			lint "${@:3}"
		else
			lint "${@:3}"
		fi
	elif [[ $GITHUB_EVENT_NAME == "pull_request_review" ]]; then
		_requires_token
		_should_fix_review "fix $GITHUB_ACTION" || _should_fix_review "fix $1"
		fix "${@:3}"
		_commit_if_needed
	fi
}

_lint_action() {
	if [[ ${GITHUB_EVENT_NAME} == "push" ]]; then
		lint "${@}"
	fi
}