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# Copyright 1999-2005 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id: $

DESCRIPTION="Manage MPI implementations"
MAINTAINER="jsbronder@gentoo.org"
SVN_DATE='$Date: $'
VERSION="0.0.1"

inherit path-manipulation config

# The basic idea is we want to allow every use to select their own mpi
# implementation they want, and a ${HOME}/.env.d/mpi file is created for them.
#   A user then is -required- to source the env file.  This sets PATH, MANPATH,
# and LD_LIBRARY_PATH.  I'm sure I'm forgetting something here.
# Calling unset only wipes out the env file, replacing it with what we
# previously added stripped out.

# If you can think of a better way to do this, while still allowing user's
# freedom, please let me know.

# List the valid mpi implementations currently installed.
find_implementations() {
	local imps
	for f in ${ROOT}/etc/env.d/mpi/*; do
		[[ -f ${f} ]] || continue
		f=$(basename ${f})
		[[ "${f#mpi-}" == "${f}" ]] && continue
		imps=(${imps[@]} ${f})
	done
    echo ${imps[@]}
}

# User's current environment has the implementation configured in it.
is_in_use() { [ "${ESELECT_MPI_IMP}" == "${1}" ]; }

# User's env file is ready for sourcing for this implementation.
is_enabled() {
	[ "$(var_from_user_envd ESELECT_MPI_IMP)" == "${1}" ]
}

var_from_user_envd(){
	[ ! -f ${user_ev} ] && return 0
	echo "$(source ${user_ev}; echo ${!1})"
}

# Is this a valid implementation?
is_implementation() {
	local imps=$(find_implementations)
	for i in ${imps[@]}; do
		[[ "${i}" == "${1}" ]] && return 0
	done
	return 1
}

init() {
	local d
	[[ ${UID} -eq 0 ]] && HOME="${ROOT}/root"
	d="$(canonicalise "${ROOT}/${HOME}")"
	user_ev="${d}/.env.d/mpi"; 
	
	if [[ ! -d "${d}" ]]; then
        mkdir "${d}" || die -q "Failed to create ${d}."
    elif [[ ! -w "${d}" ]]; then
        die -q "You do not have permission to mkdir ${d}."
    fi
    [[ -f "${f}" && ! -w "${f}" ]] && die -q "You do not have permission to write to ${f}."
}

global_env() {
	local d=$(canonicalise "${ROOT}/etc/env.d/mpi/${1}")
	[ -z "${d}" ] && die "Cannot find global env file for ${1}"
	ev=${d}
}

clean_var() { 
	local imp v
	local value="${!1}"
	local d="$(canonicalise "${ROOT}/etc/env.d/mpi/${imp}")"
	[ -z "${value}" ] && return 0
	[ -z "${d}" ] && continue
	
	for imp in $(find_implementations); do
		v=$(load_config ${d}/${imp} ${1})
		[ -z "${v}" ] && continue
		value="$(echo ${value} | sed -e "s|${v}:||g")"
	done
	echo ${value}
}


### list action ###

describe_list() {  echo "List available implementations"; }
describe_list_parameters() { echo "[-p]"; }

do_list() {
    imps=( $(find_implementations) )
	init
	if [[ ${@} == *-p* ]]; then
		echo "${imps[@]}"
	else
	    write_list_start "Available MPI implementations:"
	    if [[ -n "${imps[@]}" ]]; then
	        for (( i=0; i<${#imps[@]}; i++ )); do
	        	if is_in_use ${imps[$i]} && is_enabled ${imps[$i]}; then
					write_kv_list_entry "${imps[$i]}" "Enabled, In Use"
				elif is_in_use ${imps[$i]}; then
					write_kv_list_entry "${imps[$i]}" "In Use"
				elif is_enabled ${imps[$i]}; then
					write_kv_list_entry "${imps[$i]}" "Enabled"
				else
					write_kv_list_entry "${imps[$i]}" "--"
				fi
			done
	    else
	        write_kv_list_entry "(none found)" ""
	    fi
	fi
    return 0
}


### set action ###

describe_set() {
    echo "Select a MPI implementation."
}

describe_set_parameters() {
    echo "<target>"
}

do_set() {
	local binpath lld manpath

	init
	global_env ${1}

    [[ -z ${1} ]] && die -q "You didnt specifiy any implementation for use."
    [[ ${#@} -ne 1 ]] && die -q "You may only select exactly one implementation."
	! is_implementation ${1} && die -q "${1} is not an implementation."
	is_enabled ${1} && return 0
	
	binpath="$(load_config ${ev} PATH):$(clean_var PATH)"
	lld="$(load_config ${ev} LD_LIBRARY_PATH):$(clean_var LD_LIBRARY_PATH)"
	manpath="$(load_config ${ev} MANPATH):$(clean_var MANPATH)"

cat <<-EOF >${user_ev}
PATH="${binpath}"
MANPATH="${manpath}"
LD_LIBRARY_PATH="${lld}"
ESELECT_MPI_IMP="${1}"
export LD_LIBRARY_PATH
export PATH
export MANPATH
export ESELECT_MPI_IMP
EOF
    echo "Remember to source ${user_ev}"
}


### unset action ###
describe_unset() {
    echo "Restore MPI-less environment."
}

do_unset() {
	local binpath lld manpath

	init
	
	binpath="$(clean_var PATH)"
	lld="$(clean_var LD_LIBRARY_PATH)"
	manpath="$(clean_var MANPATH)"
cat <<-EOF >${user_ev}
PATH="${binpath}"
MANPATH="${manpath}"
LD_LIBRARY_PATH="${lld}"
export LD_LIBRARY_PATH
export PATH
export MANPATH
unset ESELECT_MPI_IMP
EOF
	echo "Remember to source ${user_ev}"
}

### add action (from skel pretty much)
describe_add() {
    echo "Add a new mpi implementation"
}

describe_add_parameters() {
    echo "<file>"
}

do_add() {
	local imp
    [[ ${#@} -ne 1 ]] \
        && die -q "Bad arguments, use:  mpi add /some/full/path/<implementation>.eselect"

    # If $D is set, we're adding from portage so we want to respect sandbox.
    # Otherwise, respect the ROOT variable.
    local PREFIX=${D:-${ROOT}/}

    # Create directory if necessary
    if [[ ! -e ${PREFIX}/etc/env.d/mpi/ ]]; then
        mkdir -p ${PREFIX}/etc/env.d/mpi/
    else
        if [[ ! -d ${PREFIX}/etc/env.d/mpi/ ]]; then
            die -q "${PREFIX}/etc/env.d/mpi/ exists but isn't a directory!"
        fi
    fi

	imp=$(basename ${1}); imp=${imp%.eselect}
    if ! cp ${1} ${PREFIX}/etc/env.d/mpi/${imp}; then
        die -q "Installing ${1} as ${PREFIX}/etc/env.d/mpi/${imp} failed!"
    fi
}


### printvar action ###
describe_printvar() { echo "Print variables stored in global env.d file."; }
describe_printvar_parameters() { echo "<implementation> <variable>"; }

do_printvar() {
	if [[ ${#@} -ne 2 ]] \
		|| ! is_implementation ${1}; then
		die -q "Specify exactly 1 implementation and 1 variable."
	fi
	global_env ${1}
	echo "$(load_config ${ev} ${2})"
}

# vim: set ft=eselect :