#!/bin/bash

#############################################################################
# bash 3 or newer ...
#
if [ ${BASH_VERSINFO:-0} -lt 3 ]; then
	echo "BASH version ${BASH_VERSION} ist not supported! You need at least version 3..."
	return
fi

#############################################################################
# implement module comand as function
#
module() {
	local -r modulecmd="${PMODULES_HOME}/bin/modulecmd"

	local -a args=()
	local -a switches=()

	while (( $# > 0 ));do
		case $1 in
		-* )
			switches+=( $1 )
			;;
		[/~a-zA-Z]* )
			args+=( $1 )
			;;
		esac
		shift
	done

	[[ ${#args[@]} == 0 ]] && args+=( 'help' )
	[[ ${#args[@]} == 1 ]] && args+=( '--' )

	local -i i=1
	for (( i=1; i < ${#args[@]}; i++ )); do
		eval $( "${modulecmd}" bash "${args[0]}" "${switches[@]}" "${args[i]}" )
	done
}
export -f module

#############################################################################
# helper functions
#
append_path () {
	local -r P=$1
	local -r d=$2

        if ! echo ${!P} | egrep -q "(^|:)${d}($|:)" ; then
		if [[ -z ${!P} ]]; then
			eval $P=${d}
		else
			eval $P="${!P}:${d}"
        	fi
	fi
}

prepend_path () {
	local -r P=$1
	local -r d=$2

        if ! echo ${!P} | egrep -q "(^|:)${d}($|:)" ; then
		if [[ -z ${!P} ]]; then
			eval $P=${d}
		else
			eval $P="${d}:${!P}"
        	fi
	fi
}

prepend_path () {
	local -r P=$1
	local -r d=$2

        if ! echo ${!P} | egrep -q "(^|:)${d}($|:)" ; then
		if [[ -z ${!P} ]]; then
			eval $P=${d}
		else
			eval $P="${d}:${!P}"
        	fi
	fi
}

#
# Replace or remove a directory in a path variable.
#
# To remove a dir:
#	replace_path PATH <pattern>
#
# To replace a dir:
#	replace_path PATH <pattern> /replacement/path
#
# Args:
#	$1 name of the shell variable to set (e.g. PATH)
#	$2 a grep pattern identifying the element to be removed/replaced
#	$3 the replacement string (use "" for removal)
#
# Based on solution published here:
# https://stackoverflow.com/questions/273909/how-do-i-manipulate-path-elements-in-shell-scripts 
#
replace_path () {
	local -r path=$1
	local -r removepat=$2
	local -r replacestr=$3

	local -r removestr=$(echo "${!path}" | tr ":" "\n" | grep -m 1 "^$removepat\$")
    	export $path=$(echo "${!path}" | tr ":" "\n" | sed "s:^${removestr}\$:${replacestr}:" |
                   sed '/^\s*$/d' | tr "\n" ":" | sed -e 's|^:||' -e 's|:$||')
}

save_env() {
	local s=''
	while (( $# > 0 )); do
		s+="$( typeset -p $1 );"
		shift
	done
	echo export PMODULES_ENV=$( "${PMODULES_HOME}/bin/base64" --wrap=0 <<< "$s" )	
}

#module purge

#############################################################################
# setup environment
#
declare -x LOADEDMODULES=''
declare -x _LMFILES_=''
declare -x PMODULES_USED_GROUPS=''
declare -x MODULEPATH=''
for group in ${PMODULES_DEFAULT_GROUPS//:/ }; do
	append_path MODULEPATH "${PMODULES_ROOT}/${group}/${PMODULES_MODULEFILES_DIR}"
	append_path PMODULES_USED_GROUPS "${group}"
done
declare -x UsedReleases=''
for r in ${PMODULES_DEFAULT_RELEASES//:/ }; do
	append_path UsedReleases "${r}"
done

eval $(save_env UsedReleases PMODULES_DEFAULT_RELEASES PMODULES_DEFAULT_GROUPS PMODULES_DEFINED_RELEASES)
unset UsedReleases
unset PMODULES_DEFAULT_RELEASES
unset PMODULES_DEFAULT_GROUPS
unset PMODULES_DEFINED_RELEASES

replace_path PATH    "${PMODULES_HOME%/*}/.*"
replace_path MANPATH "${PMODULES_HOME%/*}/.*"
append_path  PATH    "${PMODULES_HOME}/bin"

if [[ -r /etc/man.config ]]; then
	declare _manconf='/etc/man.config'
elif [[ -r /etc/man.conf ]]; then
	declare _manconf='/etc/man.conf'
fi
if [[ -n ${_manconf} ]]; then
	while read name value rest; do
		append_path MANPATH "${value}"
	done < <(grep "^MANPATH\s" "${_manconf}")
	unset _manconf
else
	append_path  MANPATH "${PMODULES_HOME}/share/man"
	append_path  MANPATH "/usr/share/man"
fi

#############################################################################
# initialize bash completion
#
if [[ -r "${PMODULES_HOME}/init/bash_completion" ]]; then
	source "${PMODULES_HOME}/init/bash_completion"
fi

#############################################################################
# legacy...
#
unset MODULE_VERSION
unset MODULE_VERSION_STACK
unset MODULESHOME

# Local Variables:
# mode: sh
# sh-basic-offset: 8
# tab-width: 8
# End: