#!/usr/bin/env bash

# Copyright (C) 2016 Paul Kocialkowski <contact@paulk.fr>
# Copyright (C) 2018,2019 Andrew Robbins <contact@andrewrobbins.info>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

PROJECT_ACTIONS_GENERIC=(usage dependencies download extract update build install release clean)
PROJECT_ACTIONS_GENERIC_IGNORE_CHECK=(usage clean)
PROJECT_ACTIONS_HELPERS=(arguments dependencies)

INSTALL_REGEX='\([^:]*\):\(.*\)'

project_include() {
	local project=$1

	local project_path=$(project_path "$project")

	unset -f "${PROJECT_ACTIONS[@]}"

	source "$project_path/$project"

	project_helper_include "$project"
}

project_helper_include() {
	local project=$1

	local project_path=$(project_path "$project")
	local include="$project_path/$project-helper"

	if [[ -f "$include" ]]
	then
		source "$include"
	fi
}

project_check() {
	local project="${1##*/}"

	local project_path="$(project_path "$project")"

	if ! [[ -f "$project_path/$project" ]]; then
		return 1
	fi
}

project_dependencies() {
	local project=$1
	shift

	if [[ -n "${PROJECTS_FORCE[*]}" ]]; then
		local expanded
		local project_force

		for project_force in "${PROJECTS_FORCE[@]}"; do
			project_arguments_expand_recursive $project_force | while IFS='' read -r expanded; do
				project_dependencies_sort $expanded
			done
		done
	fi

	project_dependencies_sort "$project" "$@" | head -n -1
}

project_dependencies_collect() {
	local project=$1
	shift

	local argument
	local path

	for argument in "" "$@"; do
		if [[ -z $argument ]]; then
			path=$CONFIGS
		else
			path=$path/$argument
		fi

		project_file_contents "$project" "$path" "$DEPENDENCIES"
	done

	project_dependencies_collect_recursive "$project" "$@"
}

project_dependencies_collect_recursive() {
	local project=$1
	shift

	local argument
	local path

	for argument in "" "$@"; do
		if [[ -z $argument ]]; then
			path=$CONFIGS
		else
			path=$path/$argument
		fi
	done

	project_action_helper arguments "$project" "$@" | while IFS='' read -r argument; do
		project_file_contents "$project" "$path/$argument" "$DEPENDENCIES"
		project_dependencies_collect_recursive "$project" "$@" "$argument"
	done
}

project_dependencies_encode_recursive() {
	local project=$1
	shift

	local project_arguments=$(arguments_concat ' ' "$project" "$@")
	local project_arguments_encoded=$(base64 -w0 <<< "$project_arguments")

	local dependency

	project_dependencies_collect "$project" "$@" | while IFS='' read -r dependency; do
		local dependency_arguments=$(arguments_concat ' ' $dependency)
		local dependency_arguments_encoded=$(base64 -w0 <<< "$dependency_arguments")

		printf '%s\n' "$project_arguments_encoded $dependency_arguments_encoded"

		project_dependencies_encode_recursive $dependency
	done
}

project_dependencies_sort() {
	local project=$1
	shift

	(
		set -o pipefail

		project_dependencies_encode_recursive "$project" "$@" | tsort | base64 -d -w0 | tac
	)
}

project_dependencies_check() {
	local project=$1
	shift

	local dependency
	local -i missing=0

	project_dependencies "$project" "$@" | while read -r dependency; do
		project_check $dependency || let ++missing
	done

	return $missing
}

project_dependencies_sources_check() {
	local project=$1
	shift

	local dependency
	local -i missing=0

	project_dependencies "$project" "$@" | while read -r dependency; do
		project_sources_directory_filled_check $dependency || let ++missing
	done

	return $missing
}

project_dependencies_action_arguments() {
	local action=$1
	local project=$2
	shift 2

	local -a dependency

	project_dependencies "$project" "$@" | while read -ra dependency; do
		if project_function_check "${dependency[0]}" "$action"; then
			project_action_arguments "$action" "${dependency[@]}"
		fi
	done
}

project_function_check() {
	local project=$1
	local function=$2

	(
		project_include "$project"

		if ! function_check "$function"; then
			exit 1
		fi
	)
}

project_action() {
	local action="$1"
	shift
	local project="$1"
	shift
	local arguments="$*"

	if project_action_check "$action" "$project" "$@"; then
		return 0
	fi

	(
		set +e

		printf '%s\n' "Project $project $action (with ${arguments:-no argument})"

		(
			set -e

			"$action" "$@"
		)

		local -i exit_status=$?

		if ((exit_status)); then
			printf 1>&2 '%s\n' "Project $project $action (with ${arguments:-no argument}) failed"
		else
			printf '%s\n' "Project $project $action (with ${arguments:-no argument}) completed"
		fi

		exit $exit_status
	)

}

project_action_check() {
	local action="$1"
	shift
	local project="$1"
	shift

	(
		set +e

		if ! function_check "${action}_check"; then
			return 1
		fi

		for project_force in $PROJECTS_FORCE; do
			if [[ "$project_force" == "$project" ]]; then
				return 1
			fi
		done

		(
			set -e
			"${action}_check" "$@"
		)
	)
}

project_action_helper() {
	local helper="$1"
	shift
	local project="$1"
	shift

	(
		project_include "$project"

		if ! function_check "$helper"; then
			exit 0
		fi

		"$helper" "$@"
	)
}

project_action_arguments() {
	local action="$1"
	shift
	local project="$1"
	shift

	(
		project_include "$project"

		project_action_arguments_verify_recursive "$action" "$project" "$@"
		project_action_arguments_recursive "$action" "$project" "$@"
	)
}

project_action_arguments_verify_recursive() {
	local action="$1"
	shift
	local project="$1"
	shift

	local action_helper_arguments

	# Store final argument.
	local argument="${*:$#}"

	local test

	if [[ "$#" -gt 1 ]]; then
		# Set previous arguments.
		set "${@:1:$#-1}"
	elif [[ "$#" -eq 1 ]]; then
		shift
	else
		return 0
	fi

	action_helper_arguments="$(project_action_helper 'arguments' "$project" "$@")"

	if [[ -n "$action_helper_arguments" ]]; then
		test="$(printf '%s\n' "$action_helper_arguments" | grep -e "^$argument\$" || true)"

		if [[ -z "$test" ]]; then
			printf 1>&2 '%s\n' "Invalid argument $argument for project $project action $action"
			return 1
		fi
	fi

	project_action_arguments_verify_recursive "$action" "$project" "$@"
}

project_action_arguments_recursive() {
	local action="$1"
	shift
	local project="$1"
	shift

	local action_helper_arguments
	local argument

	action_helper_arguments="$(project_action_helper 'arguments' "$project" "$@" || true)"

	if [[ -z "$action_helper_arguments" ]]; then
		project_action "$action" "$project" "$@"
	else
		# This is to allow space characters in arguments.
		local ifs_save="$IFS"
		local IFS=$'\n'

		for argument in $(printf '%s\n' "$action_helper_arguments")
		do
			IFS="$ifs_save"

			# Only a single argument at a time is returned by the helper.
			project_action_arguments_recursive "$action" "$project" "$@" "$argument"
		done
	fi
}

project_action_projects() {
	local action="$1"
	shift
	local project="$1"
	shift

	local project_path="$(project_path "$project")"
	local project_projects_path="$project_path/$CONFIGS/$PROJECTS"
	local project_projects_action_path="$project_path/$CONFIGS/$PROJECTS-$action"
	local arguments
	local path

	if [[ -f "$project_projects_action_path" ]]; then
		path="$project_projects_action_path"
	else
		path="$project_projects_path"
	fi

	# Multiple arguments can be read from the file.
	while read -r arguments; do
		eval "project_action_arguments $action $arguments"
	done < "$path"
}

project_action_usage() {
	local project=$1
	shift

	(
		project_include "$project"

		project_action usage "$project" "$@"
	)
}

project_path() {
	local project=$1

	local project_path="$root/$PROJECTS/$project"

	printf '%s\n' "$project_path"
}

project_sources_path() {
	local project=$1
	shift
	local repository=$1
	shift

	local sources_path
	local argument
	local path

	# Check downloaded and extracted sources first, using "$project."
	path="$root/$SOURCES/$project"

	for argument in "" "$@"
	do
		if [[ -n "$argument" ]]
		then
			path="$path-$argument"
		fi

		if ! directory_filled_check "$path"
		then
			continue
		fi

		sources_path=$path
	done

	if [[ -n "$sources_path" ]]
	then
		printf '%s\n' "$sources_path"
		return
	fi

	# Check downloaded sources then, using "$repository."
	path="$root/$SOURCES/$repository"

	if directory_filled_check "$path"
	then
		printf '%s\n' "$path"
		return
	fi

	# Check project sources finally, using "$project."
	path="$root/$PROJECTS/$project/$SOURCES"

	for argument in "" "$@"
	do
		if [[ -n "$argument" ]]
		then
			path="$path/$argument"
		fi

		if ! directory_filled_check "$path"
		then
			continue
		fi

		sources_path=$path
	done

	if [[ -n "$sources_path" ]]
	then
		printf '%s\n' "$sources_path"
		return
	fi
}

project_sources_directory_filled_check() {
	local project=$1
	shift

	local sources_path=$(project_sources_path "$project" "$@")

	test ! -z "$sources_path"
}

project_sources_directory_filled_error() {
	local project=$1
	shift
	local arguments="$*"

	local sources_path=$(project_sources_path "$project" "$@")

	if [[ -n "$sources_path" ]]
	then
		printf 1>&2 '%s\n' "Sources directory for project $project (with ${arguments:-no argument}) already exists"
		return 1
	else
		return 0
	fi
}

project_sources_directory_missing_empty_error() {
	local project=$1
	shift
	local arguments="$*"

	local sources_path=$(project_sources_path "$project" "$@")

	if [[ -z "$sources_path" ]]
	then
		printf 1>&2 '%s\n' "Sources directory for project $project (with ${arguments:-no argument}) missing or empty"
		return 1
	else
		return 0
	fi
}

project_sources_archive() {
	local project=$1
	shift

	local sources_archive
	local argument
	local path="$root/$SOURCES/$project"

	for argument in "" "$@"
	do
		if [[ -n "$argument" ]]
		then
			path="$path-$argument"
		fi

		local archive="$path.$ARCHIVE"

		if ! [[ -f "$archive" ]]
		then
			continue
		fi

		sources_archive=$archive
	done

	if [[ -n "$sources_archive" ]]
	then
		printf '%s\n' "$sources_archive"
	fi
}

project_sources_archive_extract() {
	local project=$1
	shift
	local arguments="$*"

	local archive=$(project_sources_archive "$project" "$@")
	local destination=$(dirname "$archive")

	printf '%s\n' "Extracting source archive for $project (with ${arguments:-no argument})"

	file_verification_check "$archive"
	archive_extract "$archive" "$destination"
}

project_sources_archive_update() {
	local project=$1
	shift
	local arguments="$*"

	local repository=$project
	local sources_path=$(project_sources_path "$project" "$repository" "$@")
	local archive=$(project_sources_archive "$project" "$@")
	local destination=$(dirname "$archive")

	if [[ -d "$sources_path" ]]
	then
		rm -rf "$sources_path"
	fi

	printf '%s\n' "Extracting source archive for $project (with ${arguments:-no argument})"

	file_verification_check "$archive"
	archive_extract "$archive" "$destination"
}

project_sources_archive_missing_error() {
	local project=$1
	shift
	local arguments="$*"

	local archive=$(project_sources_archive "$project" "$@")
	if [[ -z "$archive" ]] || ! [[ -f "$archive" ]]
	then
		printf 1>&2 '%s\n' "Missing sources archive for $project (with ${arguments:-no argument})"
		return 1
	else
		return 0
	fi
}

project_sources_archive_missing_check() {
	local project=$1
	shift

	local archive=$(project_sources_archive "$project" "$@")
	if [[ -z "$archive" ]] || ! [[ -f "$archive" ]]
	then
		return 0
	else
		return 1
	fi
}

project_sources_prepare() {
	local project="$1"
	shift

	project_sources_prepare_blobs "$project" "$@"
	project_sources_prepare_patch "$project" "$@"
}

project_sources_prepare_blobs() {
	local project=$1
	shift

	local sources_path=$(project_sources_path "$project" "$project" "$@")

	(
		cd "$sources_path" || exit 1

		project_blobs "$project" "$@" | while IFS='' read -r blob; do
			rm -f -- "$blob"
		done
	)
}

project_sources_prepare_patch() {
	local project="$1"
	shift

	local argument
	local path

	for argument in "$@"; do
		if [[ -z $path ]]; then
			path=$argument
		else
			path=$path/$argument
		fi
	done

	if [[ -n $project ]]; then
		project_sources_patch_recursive "$project" "$path"
	fi
}

project_sources_prepare_check() {
	local project=$1
	shift

	local sources_path=$(project_sources_path "$project" "$project" "$@")

	directory_filled_check "$sources_path"
}

project_sources_patch_recursive() {
	local project=$1
	local path=$2

	local project_path=$(project_path "$project")
	local sources_path=$(project_sources_path "$project" "$project" "$@")
	local patches_path=$project_path/$PATCHES/$path

	if ! [[ -d $project_path/$PATCHES ]]; then
		return 0
	fi

	for patch in "$patches_path"/[!.]*.@(patch|diff); do
		project_sources_patch "$sources_path" "$patch" || return 1
	done

	if [[ -n $path && $path != . ]]; then
		project_sources_patch_recursive "$project" "$(dirname "$path")"
	fi
}

project_blobs() {
	local project=$1
	shift

	local blobs_path=$(project_blobs_path "$project" "$@")
	local blobs_ignore_path=$(project_blobs_ignore_path "$project" "$@")

	if [[ -n $blobs_path ]]; then
		if [[ -n $blobs_ignore_path ]]; then
			comm -23 <(sort "$blobs_path") <(sort "$blobs_ignore_path")
		else
			cat "$blobs_path"
		fi
	fi
}

project_sources_patch() {
	local sources_path=$1
	local patch_path=$2

	if diff_patch_check "$sources_path" "$patch_path"; then
		diff_patch "$sources_path" "$patch_path"
	else
		return 1
	fi
}

project_blobs_path() {
	local project=$1
	shift

	local project_path=$(project_path "$project")
	local configs_path="$project_path/$CONFIGS"
	local argument
	local path

	for argument in "" "$@"
	do
		if [[ -n "$argument" ]]
		then
			if [[ -z "$path" ]]
			then
				path="$argument"
			else
				path="$path/$argument"
			fi
		fi

		local blobs_path="$configs_path/$path/$BLOBS"

		if [[ -f "$blobs_path" ]]
		then
			printf '%s\n' "$blobs_path"
			return
		fi
	done
}

project_blobs_ignore_path() {
	local project=$1
	shift

	local project_path=$(project_path "$project")
	local configs_path="$project_path/$CONFIGS"
	local argument
	local path

	for argument in "" "$@"
	do
		if [[ -n "$argument" ]]
		then
			if [[ -z "$path" ]]
			then
				path="$argument"
			else
				path="$path/$argument"
			fi
		fi

		blobs_ignore_path="$configs_path/$path/$BLOBS_IGNORE"

		if [[ -f "$blobs_ignore_path" ]]
		then
			printf '%s\n' "$blobs_ignore_path"
			return
		fi
	done
}

project_arguments_targets() {
	local project=$1
	shift

	local project_path=$(project_path "$project")
	local targets_path="$project_path/$CONFIGS"
	local argument

	for argument in "$@"
	do
		targets_path="$targets_path/$argument"
	done

	targets_path="$targets_path/$TARGETS"

	if [[ -f "$targets_path" ]]
	then
		cat "$targets_path"
	fi
}

project_arguments_expand_recursive() {
	local project=$1
	shift

	local -a arguments
	readarray -t arguments < <(project_action_helper arguments "$project" "$@")

	if [[ -z "${arguments[*]}" ]]; then
		echo "$project" "$@"

		return 0
	fi

	local argument

	for argument in "${arguments[@]}"; do
		project_arguments_expand_recursive "$project" "$@" "$argument"
	done
}

project_usage_actions() {
	local project="$1"
	shift

	printf '\n%s\n' 'Generic actions:'

	(
		for action in "${PROJECT_ACTIONS_GENERIC[@]}"; do
			if function_check "$action"; then
				printf '%s\n' "  $action"
			fi
		done
	)

	if [[ "$#" -gt 0 ]]; then
		printf '\n%s\n' 'Specific actions:'

		(
			for action in "$@"; do
				printf '%s\n' "  $action"
			done
		)
	fi
}

project_usage_arguments() {
	local project="$1"
	shift

	printf '\n%s\n' 'Arguments:'

	project_usage_arguments_recursive "$project" '  ' "$@"
}

project_usage_arguments_recursive() {
	local project="$1"
	shift
	local spacing="$1"
	shift

	local action_helper_arguments
	local argument

	action_helper_arguments="$(project_action_helper 'arguments' "$project" "$@")"

	if [[ -n "$action_helper_arguments" ]]; then
		for argument in $action_helper_arguments; do
			printf '%s\n' "$spacing$argument"
			project_usage_arguments_recursive "$project" "  $spacing" "$@" "$argument"
		done
	fi
}

project_download_git() {
	local project=$1
	shift
	local repository=$1
	shift
	local urls=$1
	shift

	requirements "git"

	if ! git_project_check "$repository"
	then
		project_sources_directory_filled_error "$project" "$repository" "$@"

		git_project_clone "$repository" "$urls"
	fi

	git_project_prepare "$project" "$repository" "$@"
}

project_download_check_git() {
	local project=$1
	shift
	local repository=$1
	shift

	requirements "git"

	git_project_check "$repository"
	git_project_prepare_check "$project" "$repository" "$@"
}

project_download_archive() {
	local project="$1"
	shift
	local archive_uri="$1"
	shift
	local archive_dsig_uri="$1"

	local archive="${archive_uri##*/}"
	local compress_fmt="${archive##*.tar}"

	local directory_prefix="$root/$SOURCES"
	local archive_path="$root/$SOURCES/$archive"
	local sources_path="$root/$SOURCES/$project"

	if [[ "${compress_fmt#*.}" != "${ARCHIVE#*.}" ]]; then
		ARCHIVE="tar$compress_fmt"
	fi

	# TODO: Split this code block into separate functions
	# Archive verification will be included at that point in time
	if ! project_sources_directory_filled_check "$project"; then
		download_wrapper "$directory_prefix" "$archive_uri" "$archive_dsig_uri"
		archive_extract "$archive_path" "$directory_prefix"

		mv "${archive_path%.tar*}" "$sources_path"
	fi

	project_sources_prepare "$project"
}

project_download_check_archive() {
	local project="$1"
	local sources_path="$2"

	# TODO: Write the following function
	#project_sources_archive_extract_check "$project" "$sources_path"
}

project_extract() {
	local project=$1
	shift

	local repository=$project

	if ! project_sources_directory_filled_check "$project" "$repository" "$@"
	then
		project_sources_archive_missing_error "$project" "$@" || return 1
		project_sources_archive_extract "$project" "$@"
	fi
}

project_extract_check() {
	local project=$1
	shift

	local repository=$project

	project_sources_directory_filled_check "$project" "$repository" "$@"
}

project_update_git() {
	local project=$1
	shift
	local repository=$1
	shift

	requirements "git"

	project_sources_directory_missing_empty_error "$project" "$repository" "$@"

	if git_project_check "$repository"
	then
		git_project_update "$project" "$repository" "$@"
	else
		if ! project_sources_archive_missing_check "$project" "$@"
		then
			project_sources_archive_update "$project" "$@"
		fi
	fi
}

project_update_check_git() {
	local project=$1
	shift
	local repository=$1
	shift

	requirements "git"

	if git_project_check "$repository"
	then
		# Git repository should always be updated (even if upstream didn't progress).
		# For instance, this is useful for testing new versions of patches without changing revision.
		return 1
	else
		project_sources_archive_missing_check "$project" "$@"
	fi
}

project_build_check() {
	local project=$1
	shift

	local project_path=$(project_path "$project")
	local build_path=$(project_build_path "$project" "$@")
	local source_file_path
	local argument
	local rule
	local path

	if ! [[ -d $build_path ]]
	then
		return 1
	fi

	for argument in "" "$@"
	do
		if [[ -n "$argument" ]]
		then
			if [[ -z "$path" ]]
			then
				path="$argument"
			else
				path="$path/$argument"
			fi
		fi

		configs_install_path="$project_path/$CONFIGS/$path/$INSTALL"

		if ! [[ -f "$configs_install_path" ]]
		then
			continue
		fi

		while read -r rule
		do
			source=$(printf '%s\n' "$rule" | sed "s/$INSTALL_REGEX/\\1/g")
			source_path="$build_path/$source"

			# Source may contain a wildcard.
			path_wildcard_expand "$source_path" | while read -r source_file_path
			do
				if ! [[ -f "$source_file_path" ]] && ! [[ -d "$source_file_path" ]]
				then
					return 1
				fi
			done
		done < "$configs_install_path"
	done
}

project_build_path() {
	local project=$1
	shift

	local build_path="$root/$BUILD/$project"
	local argument

	for argument in "$@"
	do
		build_path="$build_path-$argument"
	done

	printf '%s\n' "$build_path"
}

project_build_directory_missing_empty_error() {
	local project=$1
	shift
	local arguments="$*"

	local build_path=$(project_build_path "$project" "$@")

	if ! directory_filled_check "$build_path"
	then
		printf 1>&2 '%s\n' "Build directory for project $project (with ${arguments:-no argument}) missing or empty"
		return 1
	else
		return 0
	fi
}

project_install() {
	local project=$1
	shift

	local project_path=$(project_path "$project")
	local build_path=$(project_build_path "$project" "$@")
	local install_path=$(project_install_path "$project" "$@")
	local source_file_path
	local argument
	local rule
	local path

	# Install built files first.
	for argument in "" "$@"
	do
		if [[ -n "$argument" ]]
		then
			if [[ -z "$path" ]]
			then
				path="$argument"
			else
				path="$path/$argument"
			fi
		fi

		configs_install_path="$project_path/$CONFIGS/$path/$INSTALL"

		if ! [[ -f "$configs_install_path" ]]
		then
			continue
		fi

		project_build_directory_missing_empty_error "$project" "$@"

		while read -r rule
		do
			source=$(printf '%s\n' "$rule" | sed "s/$INSTALL_REGEX/\\1/g")
			source_path="$build_path/$source"

			destination=$(printf '%s\n' "$rule" | sed "s/$INSTALL_REGEX/\\2/g")
			destination_path="$install_path/$destination"
			destination_directory_path=$(dirname "$destination_path")

			mkdir -p "$destination_directory_path"

			# Source may contain a wildcard.
			path_wildcard_expand "$source_path" | while read -r source_file_path
			do
				cp -rT "$source_file_path" "$destination_path"
			done
		done < "$configs_install_path"
	done

	path=""

	# Install install files then.
	for argument in "" "$@"
	do
		if [[ -n "$argument" ]]
		then
			if [[ -z "$path" ]]
			then
				path="$argument"
			else
				path="$path/$argument"
			fi
		fi

		install_install_path="$project_path/$INSTALL/$path/$INSTALL"

		if ! [[ -f "$install_install_path" ]]
		then
			continue
		fi

		while read -r rule
		do
			source=$(printf '%s\n' "$rule" | sed "s/$INSTALL_REGEX/\\1/g")
			source_path="$project_path/$INSTALL/$path/$source"

			destination=$(printf '%s\n' "$rule" | sed "s/$INSTALL_REGEX/\\2/g")
			destination_path="$install_path/$destination"
			destination_directory_path=$(dirname "$destination_path")

			mkdir -p "$destination_directory_path"

			# Source may contain a wildcard.
			path_wildcard_expand "$source_path" | while read -r source_file_path
			do
				cp -rT "$source_file_path" "$destination_path"
			done
		done < "$install_install_path"
	done
}

project_install_check() {
	local project=$1
	shift

	local project_path=$(project_path "$project")
	local build_path=$(project_build_path "$project" "$@")
	local install_path=$(project_install_path "$project" "$@")
	local argument
	local rule
	local path

	if ! [[ -d $install_path ]]
	then
		return 1
	fi

	# Install built files first.
	for argument in "" "$@"
	do
		if [[ -n "$argument" ]]
		then
			if [[ -z "$path" ]]
			then
				path="$argument"
			else
				path="$path/$argument"
			fi
		fi

		configs_install_path="$project_path/$CONFIGS/$path/$INSTALL"

		if ! [[ -f "$configs_install_path" ]]
		then
			continue
		fi

		project_build_directory_missing_empty_error "$project" "$@"

		while read -r rule
		do
			destination=$(printf '%s\n' "$rule" | sed "s/$INSTALL_REGEX/\\2/g")
			destination_path="$install_path/$destination"

			if ! [[ -f "$destination_path" ]] && ! [[ -d "$destination_path" ]]
			then
				return 1
			fi
		done < "$configs_install_path"
	done

	path=""

	# Install install files then.
	for argument in "" "$@"
	do
		if [[ -n "$argument" ]]
		then
			if [[ -z "$path" ]]
			then
				path="$argument"
			else
				path="$path/$argument"
			fi
		fi

		install_install_path="$project_path/$INSTALL/$path/$INSTALL"

		if ! [[ -f "$install_install_path" ]]
		then
			continue
		fi

		while read -r rule
		do
			destination=$(printf '%s\n' "$rule" | sed "s/$INSTALL_REGEX/\\2/g")
			destination_path="$install_path/$destination"

			if ! [[ -f "$destination_path" ]] && ! [[ -d "$destination_path" ]]
			then
				return 1
			fi
		done < "$install_install_path"
	done
}

project_install_path() {
	local project=$1
	shift

	local install_path="$root/$INSTALL/$project"
	local argument

	for argument in "$@"
	do
		install_path="$install_path-$argument"
	done

	printf '%s\n' "$install_path"
}

project_install_directory_missing_empty_error() {
	local project=$1
	shift
	local arguments="$*"

	local install_path=$(project_install_path "$project" "$@")

	if ! directory_filled_check "$install_path"
	then
		printf 1>&2 '%s\n' "Install directory for project $project (with ${arguments:-no argument}) missing or empty"
		return 1
	else
		return 0
	fi
}

project_release_path() {
	local project=$1
	shift
	local prefix=$1

	local release_path="$root/$RELEASE/$prefix"

	# Special care for tools and systems, that depend on the host arch.
	if [[ "$prefix" = "$SYSTEMS" ]] || [[ "$prefix" = "$TOOLS" ]]
	then
		local machine=$(uname -m)

		release_path="$release_path/$machine/$project"
	else
		release_path="$release_path/$project"
	fi

	printf '%s\n' "$release_path"
}

project_release_archive_path() {
	local project=$1
	shift
	local prefix=$1
	shift

	local release_path=$(project_release_path "$project" "$prefix")
	local argument
	local path="$project"

	for argument in "$@"
	do
		path="$path-$argument"
	done

	local archive_path="$release_path/$path.$ARCHIVE"

	printf '%s\n' "$archive_path"
}

project_release_rootfs_path() {
	local project=$1
	shift
	local prefix=$1
	shift

	local release_path=$(project_release_path "$project" "$prefix")
	local argument
	local path="$project"

	for argument in "$@"
	do
		path="$path-$argument"
	done

	local rootfs_path="$release_path/$path.$ARCHIVE"

	printf '%s\n' "$rootfs_path"
}

project_release_sources_archive_path() {
	local project=$1
	shift

	local repository="$project"
	local sources_path="$(project_sources_path "$project" "$repository" "$@")"
	local archive_path="$root/$RELEASE/$SOURCES/$project/${sources_path##*/}.$ARCHIVE"

	printf '%s\n' "$archive_path"
}

project_release_sources_archive_create() {
	local project=$1
	shift
	local arguments="$*"

	local repository=$project
	local archive_path=$(project_release_sources_archive_path "$project" "$@")
	local sources_path=$(project_sources_path "$project" "$repository" "$@")

	printf '%s\n' "Releasing sources archive for $project (with ${arguments:-no argument})"

	archive_create "$archive_path" "$sources_path"
	file_verification_create "$archive_path"
}

project_release_sources_archive_exists_check() {
	local project=$1
	shift

	local archive_path=$(project_release_sources_archive_path "$project" "$@")
	if [[ -z "$archive_path" ]] || ! [[ -f "$archive_path" ]]
	then
		return 1
	else
		return 0
	fi
}

project_release_sources_git() {
	local project=$1
	shift
	local repository=$1
	shift

	requirements "git"

	project_sources_directory_missing_empty_error "$project" "$repository" "$@"

	if git_project_check "$repository"
	then
		if ! git_project_release_check "$project" "$repository" "$@"
		then
			git_project_release "$project" "$repository" "$@"
		fi
	else
		if ! project_release_sources_archive_exists_check "$project" "$@"
		then
			project_release_sources_archive_create "$project" "$@"
		fi
	fi
}

project_release_check_sources_git() {
	local project=$1
	shift
	local repository=$1
	shift

	requirements "git"

	if git_project_check "$repository"
	then
		git_project_release_check "$project" "$repository" "$@"
	else
		project_release_sources_archive_exists_check "$project" "$@"
	fi
}

project_release_install() {
	local project=$1
	shift
	local prefix=$1
	shift

	local install_path=$(project_install_path "$project" "$@")
	local release_path=$(project_release_path "$project" "$prefix")
	local directory_path
	local path

	project_install_directory_missing_empty_error "$project" "$@"

	local files=$(find "$install_path" -type f || true)
	local file

	printf '%s\n' "$files" | while read -r file
	do
		path="$release_path/$file"
		directory_path=$(dirname "$path")

		mkdir -p "$directory_path"

		cp "$install_path/$file" "$path"
		file_verification_create "$path"
	done
}

project_release_install_check() {
	local project=$1
	shift
	local prefix=$1
	shift

	local install_path=$(project_install_path "$project" "$@")
	local release_path=$(project_release_path "$project" "$prefix")
	local path

	project_install_directory_missing_empty_error "$project" "$@"

	local files=$(find "$install_path" -type f || true)
	local file

	printf '%s\n' "$files" | while read -r file
	do
		path="$release_path/$file"

		file_exists_check "$path"
	done
}

project_release_install_archive() {
	local project=$1
	shift
	local prefix=$1
	shift

	project_install_directory_missing_empty_error "$project" "$@"

	project_release_install_archive_create "$project" "$prefix" "$@"
}

project_release_install_archive_check() {
	local project=$1
	shift

	project_release_install_archive_exists_check "$project" "$@"
}

project_release_install_archive_create() {
	local project=$1
	shift
	local prefix=$1
	shift
	local arguments="$*"

	local install_path=$(project_install_path "$project" "$@")
	local archive_path=$(project_release_archive_path "$project" "$prefix" "$@")

	printf '%s\n' "Releasing $prefix archive for $project (with ${arguments:-no argument})"

	archive_create "$archive_path" "$install_path"
	file_verification_create "$archive_path"
}

project_release_install_archive_exists_check() {
	local project=$1
	shift
	local prefix=$1
	shift

	local archive_path=$(project_release_archive_path "$project" "$prefix" "$@")

	file_exists_check "$archive_path"
}

project_release_install_rootfs() {
	local project=$1
	shift
	local prefix=$1
	shift

	project_install_directory_missing_empty_error "$project" "$@"

	if ! project_release_install_rootfs_exists_check "$project" "$prefix" "$@"
	then
		project_release_install_rootfs_create "$project" "$prefix" "$@"
	fi
}

project_release_install_rootfs_check() {
	local project=$1
	shift

	project_release_install_rootfs_exists_check "$project" "$@"
}

project_release_install_rootfs_create() {
	local project=$1
	shift
	local prefix=$1
	shift
	local arguments="$*"

	local install_path=$(project_install_path "$project" "$@")
	local rootfs_path=$(project_release_rootfs_path "$project" "$prefix" "$@")

	printf '%s\n' "Releasing $prefix rootfs for $project (with ${arguments:-no argument})"

	rootfs_create "$rootfs_path" "$install_path"
	file_verification_create "$rootfs_path"
}

project_release_install_rootfs_exists_check() {
	local project=$1
	shift
	local prefix=$1
	shift

	local rootfs_path=$(project_release_rootfs_path "$project" "$prefix" "$@")

	file_exists_check "$rootfs_path"
}

project_clean() {
	local project=$1
	shift

	project_clean_build "$project" "$@"
	project_clean_install "$project" "$@"
	project_clean_release "$project" "$@"
}

project_clean_build() {
	local project=$1
	shift

	local build_path=$(project_build_path "$project" "$@")

	rm -rf "$build_path"
}

project_clean_install() {
	local project=$1
	shift

	local install_path=$(project_install_path "$project" "$@")

	rm -rf "$install_path"
}

project_clean_release() {
	local project=$1
	shift

	local prefix

	for prefix in "$SOURCES" "$SYSTEMS" "$IMAGES" "$TOOLS" "$DOCS"
	do
		local release_path=$(project_release_path "$project" "$prefix")

		rm -rf "$release_path"
	done
}

project_clean_rootfs() {
	local project=$1
	shift

	project_clean_build "$project" "$@"
	project_clean_rootfs_install "$project" "$@"
	project_clean_release "$project" "$@"

}

project_clean_rootfs_install() {
	local project=$1
	shift

	local install_path=$(project_install_path "$project" "$@")

	execute_root rm -rf "$install_path"

}

project_file_path() {
	local project=$1
	shift
	local directory=$1
	shift
	local file=$1
	shift

	local project_path=$(project_path "$project")
	local path="$project_path/$directory"
	local argument
	local file_path

	for argument in "" "$@"
	do
		if [[ -n "$argument" ]]
		then
			path="$path/$argument"
		fi

		if ! [[ -f "$path/$file" ]]
		then
			continue
		fi

		file_path="$path/$file"

		break
	done

	if [[ -z "$file_path" ]]
	then
		return 1
	fi

	printf '%s\n' "$file_path"
}

project_file_test() {
	local file_path=$(project_file_path "$@")

	test -f "$file_path"
}

project_file_contents() {
	local file_path=$(project_file_path "$@")

	if [[ -f "$file_path" ]]
	then
		cat "$file_path"
	fi
}

project_file_contents_herit() {
	local project=$1
	shift
	local directory=$1
	shift
	local file=$1
	shift

	local project_path=$(project_path "$project")
	local path="$project_path/$directory"
	local argument
	local file_path

	for argument in "" "$@"
	do
		if [[ -n "$argument" ]]
		then
			path="$path/$argument"
		fi

		file_path="$path/$file"

		if ! [[ -f "$file_path" ]]
		then
			continue
		fi

		cat "$file_path"
	done
}