#!/bin/bash

set -x

declare -r mydir=$(dirname "$0")
declare -r libpbuild='libpbuild.bash'
declare -r libstd='libstd.bash'
declare -r pmodule_environment='environment.bash'

# source BASH library with standard functions
if [[ -r ${mydir}/${libstd} ]]; then
        source "${mydir}/${libstd}"
elif [[ -r ${mydir}/../lib/${libstd} ]]; then
	source "${mydir}/../lib/${libstd}"
else
	echo "Oops: required BASH library '${libstd}' not found" 1>&2
	exit 1
fi

declare -rx BUILD_BLOCK=$(std::get_abspath "$1")
declare -rx BUILD_BLOCK_DIR=$(dirname "${BUILD_BLOCK}")
shift 1

# source Pmodule environment configuration
if [[ -r ${mydir}/../config/${pmodule_environment} ]]; then
	# we are bootstrapping
        source "${mydir}/../config/${pmodule_environment}"
	declare -rx BUILD_BASEDIR=$(std::get_abspath "${mydir}/..")
	bootstrap='yes'
	
elif [[ -n ${PMODULES_ROOT} ]] && [[ -n ${PMODULES_CONFIG_DIR} ]] && \
     [[ -r ${PMODULES_ROOT}/${PMODULES_CONFIG_DIR}/${pmodule_environment} ]]; then
	source ${PMODULES_ROOT}/${PMODULES_CONFIG_DIR}/${pmodule_environment}
	declare -rx BUILD_BASEDIR=$(std::get_abspath "${BUILD_BLOCK_DIR}/../../..")
	bootstrap='no'

fi

#
# We need GNU versions of the following utilities. This code works
# well on Linux and Mac OS X with MacPorts.
# :FIXME: implement a smarter, portable solution.
#
shopt -s expand_aliases
unalias -a

__path=$(which gdate 2>/dev/null)
if [[ $__path ]]; then
	alias date=$__path
else
	alias date=$(which date 2>/dev/null)
fi

__path=$(which ginstall 2>/dev/null)
if [[ $__path ]]; then
	alias install=$__path
else
	alias install=$(which install 2>/dev/null)
fi

__path=$(which greadlink 2>/dev/null)
if [[ $__path ]]; then
	alias readlink=$__path
else
	alias readlink=$(which readlink 2>/dev/null)
fi

__path=$(which gsed 2>/dev/null)
if [[ $__path ]]; then
	alias sed=$__path
else
	alias sed=$(which sed 2>/dev/null)
fi

#
# set an error handler. If a function _exit() exists, it will be called
# with the passed exit code.
#
# $1	exit code
#
set -o errexit

trap "std::error_handler" ERR

std::error_handler() {
	local -i ec=$?

	typeset -F _exit 1>/dev/null 2>&1 && _exit "${ec}"
	exit ${ec}
}

#
# run build
#

if [[ -r ${mydir}/${libpbuild} ]]; then
        source "${mydir}/${libpbuild}"
elif [[ -r ${mydir}/../lib/${libpbuild} ]]; then
	source "${mydir}/../lib/${libpbuild}"
else
	echo "Oops: required BASH library '${libpbuild}' not found" 1>&2
	exit 1
fi

source "${BUILD_BLOCK}"