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#
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# set -o errexit -o noglob are assumed.
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#
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EXP_RTL_IFS="${IFS}";
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ex_rtl_basename() { echo "${1##*/}"; };
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ex_rtl_date() { command date "+${1:-${DEFAULT_TIMESTAMP_FMT}}"; };
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ex_rtl_dirname() { echo "${1%/*}"; };
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ex_rtl_get_var_unsafe() { eval echo \${${1}}; };
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ex_rtl_pop_IFS() { IFS="${EXP_RTL_IFS}"; };
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ex_rtl_push_IFS() { EXP_RTL_IFS="${IFS}"; IFS="${1}"; };
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ex_rtl_try_run() { ex_rtl_test_cmd "${1}" && { "${@}" || exit ${?}; }; };
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ex_rtl_set_var_unsafe() { [ -n "${2}" ] && eval ${1}=\"${2}\" || return 0; };
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ex_rtl_test_cmd() { command -v "${1}" >/dev/null; };
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ex_rtl_toupper() { echo "${1}" | tr a-z A-Z; };
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ex_rtl_unset_vars() { while [ ${#} -gt 0 ]; do unset "${1}"; shift; done; };
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ex_rtl_lfilter() {
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	local _list="${1}" _filter="${2}" _lnew _litem _litem_filter;
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	if [ -z "${_filter}" ]; then
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		echo "${_list}"; return 0;
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	else for _litem in ${_list}; do
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		for _litem_filter in ${_filter}; do
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			if [ "${_litem_filter}" = "${_litem}" ]; then
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				_lnew="${_lnew:+${_lnew} }${_litem}";
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				break;
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			fi;
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		done;
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	done; fi;
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	echo "${_lnew}";
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};
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ex_rtl_lfilter_not() {
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	local _list="${1}" _filter="${2}" _lnew _litem _litem_filter _filterfl;
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	if [ -z "${_filter}" ]; then
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		echo "${_list}"; return 0;
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	else for _litem in ${_list}; do
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		_filterfl=0;
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		for _litem_filter in ${_filter}; do
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			if [ "${_litem_filter}" = "${_litem}" ]; then
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				_filterfl=1; break;
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			fi;
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		done;
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		if [ "${_filterfl:-0}" -eq 0 ]; then
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			_lnew="${_lnew:+${_lnew} }${_litem}";
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		fi;
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	done; fi;
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	echo "${_lnew}";
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};
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ex_rtl_lmatch() {
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	local _cmp="${3}" IFS="${2}"; set -- ${1};
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	while [ ${#} -gt 0 ]; do
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		if [ "${1}" = "${_cmp}" ]; then
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			return 0;
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		fi; shift;
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	done; return 1;
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};
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ex_rtl_run_cmd_unsplit() {
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	local _cmd="${1}" _cmdline _rc IFS; shift;
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	while [ ${#} -gt 0 ]; do
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		[ -n "${1}" ] &&\
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			_cmdline="${_cmdline:+${_cmdline}:}${1}";
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		shift;
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	done;
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	IFS=:; ${_cmd} ${_cmdline}; _rc=$?;
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	return ${_rc};
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};
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ex_rtl_set_vars() {
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	local _vname_dst="${1}" _vname_src_tmpls="${2}"			\
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		_vars_set_vname="${3}" _vname_src _vars_set_tmp=""	\
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		_vars_set_old;
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	for _vname_src in ${_vname_src_tmpls}; do
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		_vname_src="${_vname_src}_${_vname_dst}";
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		_vval_src="$(ex_rtl_get_var_unsafe "${_vname_src}")";
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		if [ -n "${_vval_src}" ]; then
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			ex_rtl_set_var_unsafe "PKG_${_vname_dst}" "${_vval_src}";
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			_vars_set_tmp="${_vars_set_tmp:+${_vars_set_tmp} }PKG_${_vname_dst}";
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		fi;
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	done;
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	_vars_set_old="$(ex_rtl_get_var_unsafe "${_vars_set_vname}")";
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	ex_rtl_set_var_unsafe "${_vars_set_vname}"				\
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		"${_vars_set_old:+${_vars_set_old} }${_vars_set_tmp}";
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};
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# vim:filetype=sh