addopt.sh

# Copyright (c) 2013 Gabriel Corona <gabriel.corona@enst-bretagne.fr>
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.


# Prepend path to given variable:
#  VARIABLE  : name of the variable
#  path      : path to prepend
#  default   : default (when the variable is not defined)
#  separator : path separator
_addopt_prepend() {
	if [ $# -le 1 ]; then
		echo "Error in prepend" >&2
		exit 1
	fi

	local VARIABLE;
	VARIABLE="$1";
	local addpath;
	addpath="$2";
	local default;
	default="$3";
	local separator;
	separator="$4";

	# Default separator:
	if [ $# -le 3 ]; then
		separator=":";
	fi

	# Default value:
	echo "$VARIABLE+=$addpath" >&2
	if [ -z $(eval echo \$$VARIABLE) ]; then
		if [ -z "$default" ]; then
			eval "export $VARIABLE=\$addpath"
			return
		fi
		eval "export \$VARIABLE=$default";
	fi

	# Prepend path:
	eval "export $VARIABLE=$addpath$separator\$$VARIABLE";
}

# Prepend some path if it exists
#   VARIABLE  : name of the variable
#   path      : path to prepend
#   default   : default (when the variable is not defined)
#   separator : path separator
_addopt_check() {
	if [ -e "$2" ]; then
		_addopt_prepend "$@"
	fi
}

# Update environment variables for a given path
#  path : path
_addopt_handle() {

	local p

	# Runtime

	# ld.so
	_addopt_check LD_LIBRARY_PATH "$1/lib"

	# GCC
	_addopt_check LIBRARY_PATH "$1/lib"

	# PATH (execp)
	for p in "$1/games" "$1/bin" "$1/sbin"; do
		_addopt_check PATH "$p"
	done

	# Doc

	# man
	if which manpath > /dev/null ; then
		_addopt_check MANPATH "$1/share/man" `manpath`
	fi

	# info
	for p in "$1/share/info" "$1/info"; do
		_addopt_check INFOPATH "$p"
	done

	# Compilation

	# ld
	_addopt_check LD_RUN_PATH "$1/lib"

	# pkg-config
	for p in "$1/share/pkgconfig" "$1/lib/pkgconfig"; do
		_addopt_check PKG_CONFIG_PATH "$p"
	done

	# cpp
	_addopt_check CPATH "$1/include"
}

addopt() {
	while [ $# -gt 0 ]; do
		case "$1" in
			--help)
			;;
			/* | ./* | ../* | . | ..)
				_addopt_handle "$(readlink -m "$1")"
			;;
			*)
				_addopt_handle "/opt/$1"
			;;
		esac
		shift
	done
}