#

# . ./build.vars and set -o errexit are assumed.

# See warning at the top of build.vars.

#

date() { command date +"${1:-${TIMESTAMP_FMT}}"; };

fetch_git() { [ -d ${1} ] && (cd ${1} && git pull origin main) || git clone ${3} ${2} ${1}; };

get_basename() { set -- $(get_name_without_slash ${1}); echo "${1##*/}"; };

get_var_dyn() { ${1}; };

get_var_unsafe() { eval echo \${${1}}; };

set_var_dyn() { eval ${1}\(\) \{ echo \"${2}\"\; \}; };

set_var_unsafe() { eval ${1}=\"${2}\"; };

get_name_without_slash() { while [ "x${1%/}" != "x${1}" ]; do set -- ${1%/}; done; echo ${1}; };

get_postfix_lrg() { echo "${1##*${2}}"; };

get_prefix_lrg() { echo "${1%%${2}*}"; };

get_postfix() { echo "${1#*${2}}"; };

get_prefix() { echo "${1%${2}*}"; };

match_any() { [ "x${1#*${2}*}" != "x${1}" ]; };

push_IFS() { _pI_IFS="${IFS}"; IFS="${1}"; };

pop_IFS() { IFS="${_pI_IFS}"; unset _pI_IFS; };

set_build_dir() { PKG_BUILD_DIR=${1}-${2}-${TARGET}; };

split() { push_IFS "${1}"; set -- ${2}; pop_IFS; echo "${*}"; };

test_cmd() { command -v "${1}" >/dev/null; };

unsplit() { push_IFS "${1}"; shift; set -- "${@}"; echo "${*}"; pop_IFS; };

export_vars_subst() {

	_evs_pfx=${1}; _evs_pfx_new=${2}; shift 2;

	while [ ${#} -gt 0 ]; do

		if [ -n "${_evs_vval:=$(get_var_unsafe ${_evs_pfx}${1})}" ]; then

			export "${_evs_pfx_new}${1}=${_evs_vval}";

		fi; unset _evs_vval; shift;

	done; unset _evs_pfx _evs_pfx_new;

};

rm_if_exists() {

	[ -z "${1#-m}" ] && { _rie_arg_m=1; shift; };

	[ -z "${1#-c}" ] && { _rie_arg_c=1; shift; };

	[ -d ${1} -o -f ${1} ] && rm -rf ${1};

	[ ${_rie_arg_m:-0} -eq 1 ] && { mkdir ${1}; unset _rie_arg_m; };

	[ ${_rie_arg_c:-0} -eq 1 ] && { cd ${1}; unset _rie_arg_c; };

	return 0;

};

set_env_vars() {

	_sev_val_new="${1}"; shift;

	while [ ${#} -gt 1 ]; do

		[ -z "${_sev_val_new}" ] && unset ${1} ||\

			export "${1}=${_sev_val_new}"; shift;

	done; unset _sev_val_new;

};

# Download GNU bash-style patch sets into ${2}-patches-extra and

# apply them to ${2} in the correct order.

apply_patches() {

	(rm_if_exists -m -c ${2}-patches-extra;

	wget -c -nd -np -r -R \*.htm\* -R \*.sig ${1};

	for _ap_patch_fname in		\

			$(find . -type f -not -iname \*.sig | sort); do

		patch -b -d ../${2} -p0 < ${_ap_patch_fname};

	done; unset _ap_patch_fname);

};

# Check whether all supplied arguments contain non-empty valid values.

check_path_vars() {

	while [ ${#} -gt 0 ]; do

		if [ -z "${_cpv_val:=$(get_var_unsafe "${1}")}" ]; then

			log_msg failexit "Error: variable \`${1}' is empty or unset.";

		elif match_any "${_cpv_val}" " "; then

			log_msg failexit "Error: variable \`${1}' contains one or more whitespace characters.";

		else

			shift;

		fi;

		unset _cpv_val;

	done;

};

# Check whether all supplied command names resolve.

check_prereqs() {

	while [ ${#} -gt 0 ]; do

		if ! command -v ${1} >/dev/null; then

			log_msg failexit "Error: missing prerequisite command \`${1}'.";

		fi; shift;

	done;

};

# Clear the environment by unsetting each exported variable except

# for those named by the caller. 

clear_env_with_except() {

	_cewe_vfilter="${*}"; _cewe_unset_cmds="$(mktemp -q)";

	export | while read _cewe_vspec; do

		set -- ${_cewe_vspec}; shift;

		[ "x${1#*[^\"\'=a-zA-Z0-9_]}" != "x${1}" ] && continue;

		if ! match_list "${_cewe_vfilter}" " "	\

				$(get_prefix_lrg ${1} =); then

			echo unset $(get_prefix_lrg ${1} =) >> ${_cewe_unset_cmds};

		fi;

	done; . "${_cewe_unset_cmds}"; rm -f "${_cewe_unset_cmds}" 2>/dev/null;

	unset _cewe_vfilter _cewe_vspec;

};

fetch() {

	wget ${WGET_ARGS} ${1};

	if [ ${#} -eq 2 ]; then

		set -- $(get_basename ${1}) "$(compare_hash $(get_basename ${1}) ${2})" ${2};

		if [ -n "${2}" ]; then

			log_msg failexit "Error: hash mismatch for URL \`${1}' (is: ${2}, should be: ${3}.)";

		fi;

	fi;

};

compare_hash() {

	# Push the output of dgst(1SSL) and the caller-supplied hash

	# value to compare the former with on the pseudo-stack and

	# shift off# all but the last two positional parameters.

	# This corresponds to the hash output and caller-supplied

	# hash values.

	set -- $(openssl dgst -sha256 ${1}) ${2}; shift $((${#}-2));

	[ "x${1}" = "x${2}" ] || echo "${1}";

};

compare_hash_manifest() {

	while [ ${#} -gt 0 ]; do

		if ! compare_hash ${1} ${2}; then

			log_msg failexit "Error: hash mismatch for patch file \`${1}'.";

		fi; shift;

	done; return 0;

};

is_build_script_done() {

	if [ -n "${ARG_BUILD_STEPS}" ]; then

		if [ "${ARG_BUILD_STEPS}" = "finish" ]\

		|| [ -z "${ARG_BUILD_STEPS#ALL}" ]; then

			return 1;	# Build

		elif ! match_list ${ARG_BUILD_STEPS} , ${1}; then

			return 0;	# Skip

		else

			return 1;	# Build

		fi;

	elif [ -f ${WORKDIR}/.${2:-$(get_basename ${SCRIPT_FNAME%.build})}.${1} ]; then

		return 0;		# Skip

	else

		return 1;		# Build

	fi;

};

set_build_script_done() {

	_sbsd_script_fname=${SCRIPT_FNAME##*/};

	_sbsd_done_fname=${WORKDIR}/.${_sbsd_script_fname%.build};

	while [ $# -ge 1 ]; do

		if [ "x${1#-}" != "x${1}" ]; then

			rm -f ${_sbsd_done_fname}.${1#-};

		else

			touch ${_sbsd_done_fname}.${1};

			log_msg info "Finished build step ${1} of build script \`${_sbsd_script_fname}'.";

		fi; shift;

	done; unset _sbsd_script_fname _sbsd_done_fname;

};

log_env_vars() {

	log_msg info "Variables for this build:";

	while [ ${_lev_nvar:=0} -lt ${#} ]; do

		_lev_arg="$(eval echo \${${_lev_nvar}})";

		_lev_arg="${_lev_arg%%=*}";

		if [ ${#_lev_arg} -gt ${_lev_arg_len_max:=0} ]; then

			_lev_arg_len_max=${#_lev_arg};

		fi; : $((_lev_nvar+=1));

	done; unset _lev_nvar _lev_arg;

	while [ ${#} -gt 0 ]; do

		log_msg info "$(printf					\

			"%${_lev_arg_len_max}.${_lev_arg_len_max}s=%s"	\

			"${1%%=*}" "$(get_var_unsafe ${1#*=})")";

		shift;

	done; unset _lev_arg_len_max;

};

log_msg() {

	_lm_lvl=${1}; shift;

	case ${_lm_lvl} in

		failexit) printf "\033[${LOG_MSG_FAIL_COLOUR}m"; ;;

		fail) printf "\033[${LOG_MSG_FAIL_COLOUR}m"; ;;

		info) printf "\033[${LOG_MSG_INFO_COLOUR}m"; ;;

		succ) printf "\033[${LOG_MSG_SUCC_COLOUR}m"; ;;

	esac;

	if [ $# -gt 1 ]; then

		printf "==> %s %s %s\033[0m\n" "$(date "${TIMESTAMP_FMT}")" "${1}" "$*";

	else

		printf "==> %s %s\033[0m\n" "$(date "${TIMESTAMP_FMT}")" "${1}";

	fi; [ ${_lm_lvl} = failexit ] && exit 1 || unset _lm_lvl;

};

match_list() {

	_ml_cmp="${3}"; push_IFS "${2}"; set -- ${1}; pop_IFS;

	while [ ${#} -gt 0 ]; do

		if [ "x${1}" = "x${_ml_cmp}" ]; then

			unset _ml_cmp; return 0;

		fi; shift;

	done; unset _ml_cmp; return 1;

};

parse_with_pkg_name() {

	PKG_LVL=${1}; PKG_NAME=${2}; shift 2;

	while [ ${#} -ge 0 ]; do

		if [ "x${PKG_NAME}" = "x${1}" ]; then

			export_vars_subst PKG_LVL${PKG_LVL}_ PKG_ ${PKG_BUILD_VARS};

			export_vars_subst PKG_$(echo ${PKG_NAME} | tr a-z A-Z)_ PKG_ ${PKG_BUILD_VARS};

			[ -z "${PKG_URL}" ] && return 1;

			[ -z "${PKG_FNAME}" ] && PKG_FNAME=${PKG_URL##*/};

			[ -z "${PKG_SUBDIR}" ] && PKG_SUBDIR=${PKG_FNAME%%.tar*};

			[ -n "${PKG_ENV_VARS_EXTRA}" ] && export ${PKG_ENV_VARS_EXTRA};

			return 0;

		fi; shift;

	done; return 1;

};

run_cmd_unsplit() {

	_rcu_cmd=${1}; shift;

	while [ ${#} -gt 0 ]; do

		[ -n "${1}" ] &&\

			_rcu_cmdline="${_rcu_cmdline:+${_rcu_cmdline},}${1}";

		shift;

	done;

	push_IFS ,; ${_rcu_cmd} ${_rcu_cmdline}; _rcu_rc=$?; pop_IFS;

	unset _rcu_cmd _rcu_cmdline; return ${_rcu_rc};

};

# vim:filetype=sh