git-commit-modules

#! /usr/bin/env bash

# Author: Thomas DEBESSE <dev@illwieckz.net>
# License: ISC

set -u -e -o pipefail

printError () {
	local format="${1}"; shift
	printf "ERROR: ${format}\n" "${@}" >&2
	false
}

printStatus () {
	local format="${1}"; shift
	printf "STATUS: ${format}\n" "${@}" >&2
}

askForConfirmation () {
	if "${auto}"
	then
		printStatus 'Continuing without asking for confirmation.'
	else
		read -p 'ok? [yes]|shell|no ' answer
		case "${answer}" in
			[yY]|'yes'|'')
				;;
			[sS]|'shell')
				printStatus 'Opening a shell.'

				/usr/bin/env bash

				printStatus 'Returning to operation.'
				;;
			*)
				printError 'Aborting.'
				false
				;;
		esac
	fi
}

getOptionLength () {
	local option_name="${1}"

	# HACK: '\n' has same length than '='
	printf -- "${1}" | cut -f1 -d'=' | wc -c
}

auto='false'
commit_branch=''
merge_branch=''
repository_list=()

for option_name in "${@}"
do
	case "${option_name}" in
		'--yes')
			auto='true'
			;;
		'--branch='*)
			option_length="$(getOptionLength "${option_name}")"
			commit_branch="${option_name:${option_length}}"
			;;
		'--merge='*)
			option_length="$(getOptionLength "${option_name}")"
			merge_branch="${option_name:${option_length}}"
			;;
		'--'*)
			printError 'Unknown option: %s' "${option_name}"
			;;
		*)
			if [ ! -d "${option_name}" ]
			then
				printError 'Not a directory: %s' "${option_name}"
			fi

			repository_list+=("$(realpath "${option_name}")")
			;;
	esac
	shift
done

if [ -z "${commit_branch}" ]
then
	printError 'Missing branch name.'
fi

if [ "${#repository_list[@]}" = 0 ]
then
	printError 'Missing repository.'
fi

export TZ='GMT'
export GIT_AUTHOR_DATE="${GIT_AUTHOR_DATE:-$(date --utc --rfc-3339='s')}"
export GIT_COMMITTER_DATE="${GIT_AUTHOR_DATE}"

echo "${GIT_AUTHOR_DATE}"

askForConfirmation

fixRepositoryUrls () {
	local config_path
	for config_path in '.git/config' '.git/modules'
	do
		if [ -e "${config_path}" ]
		then
			find -type f -name 'config' \
				-exec sed -e 's|https://github.com/|git@github.com:|' -i {} \;
		fi
	done
}

for repository in "${repository_list[@]}"
do
	cd "${repository}"

	# Prune all deleted branches, this is needed if 'something' is deleted but 'something/more' has to be pulled.
	# Clone submodules of every repositories if needed.
	# Fetch available remote branches references of every repositories.
	git-checkout-modules --run-after='git remote prune origin'
	git-checkout-modules --update
	git-checkout-modules --fetch

	# Clone submodules of every repositories if needed.
	# Checkout primary branch of every repositories (there may be new ones).
	# Pull updates for primary branch of every repositories.
	# FIXME: Parent branch should never be merge branch if child branch is commit branch.
	git-checkout-modules "${commit_branch}"
	git-checkout-modules --pull

	git-checkout-modules --print

	askForConfirmation

	case "${merge_branch}" in
		'')
			# Commit submodules references of every repositories.
			git-checkout-modules --commit
			;;
		*)
			# Merge secondary branch of every repositories.
			git-checkout-modules --merge="${merge_branch}"
			;;
	esac

	git-checkout-modules --print

	askForConfirmation

	# Fix urls of every repositories to make push possible.
	# Push commits to every repositories.
	fixRepositoryUrls
	git-checkout-modules --push

	# Checkout primary branch of every repositories.
	git-checkout-modules "${commit_branch}"
done