#!/usr/bin/env bash
#   Copyright (C) 2013-2014 Luke Shumaker <lukeshu@sbcglobal.net>
#
#   License: GNU GPLv2+
#
#   This program is free software; you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation; either version 2 of the License, or
#   (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program.  If not, see <http://www.gnu.org/licenses/>.

default_libdir=/usr/lib/libretools

if type gettext &>/dev/null; then
	_() { gettext "$@"; }
else
	_() { echo "$@"; }
fi

_l() {
	TEXTDOMAIN='librelib' TEXTDOMAINDIR='/usr/share/locale' "$@"
}

print() {
	local mesg="$(_ "$1")"
	shift
	printf -- "$mesg\n" "$@"
}

_html_whitespace_collapse() {
	tr '\n' ' ' | sed -r -e 's/\t/ /g' -e 's/  +/ /g'
}

prose() {
	local mesg="$(_ "$(_html_whitespace_collapse <<<"$1")")"; shift
	printf -- "$mesg" "$@" | fmt -u
}

cmd=${0##*/}
usage() {
	. libremessages
	print 'Usage: . $(%s LIBRARY)' "$cmd"
	print 'Usage: %s -h' "$cmd"
	print "Finds a Bash library file"
	echo
	prose "While some libraries can be sourced just by their name because
	       they are installed in PATH (like libremessages), some are not
	       installed there (like conf.sh), so a path must be given.
	       Hardcoding that path is the way of the dark side."
	echo
	prose 'By default, it looks for the files in `%s`, but this can be
	       changed with the environmental variable LIBRETOOLS_LIBDIR.' "$default_libdir"
	echo
	print "Example usage:"
	printf '  . $(%s conf)\n' "$cmd"
	echo
	print "Options:"
	flag '-h' 'Show this message'
}

main() {
	if [[ $# != 1 ]]; then
		_l usage >&2
		return 2
	fi
	if [[ $1 == '-h' ]]; then
		_l usage
		return 0;
	fi

	if [[ -z $LIBRETOOLS_LIBDIR ]]; then
		export LIBRETOOLS_LIBDIR=$default_libdir
	fi

	lib=$1
	lib=${lib#libre}
	lib=${lib%.sh}

	for file in ${lib} libre${lib} ${lib}.sh libre${lib}.sh; do
		if [[ -f "$LIBRETOOLS_LIBDIR/$file" ]]; then
			printf '%s\n' "$LIBRETOOLS_LIBDIR/$file"
			return 0;
		fi
	done
	_l print '%s: could not find library: %s' "$cmd" "$lib" >&2
	return 1
}

main "$@"