#!/bin/sh
# --- SDE-COPYRIGHT-NOTE-BEGIN ---
# This copyright note is auto-generated by ./scripts/Create-CopyPatch.
# 
# Filename: bin/sde
# Copyright (C) 2006 - 2007 The OpenSDE Project
# 
# More information can be found in the files COPYING and README.
# 
# 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; version 2 of the License. A copy of the
# GNU General Public License can be found in the file COPYING.
# --- SDE-COPYRIGHT-NOTE-END ---

set -e

# stand-alone simplified minimal functions
#
echo_info() {
	echo "-> $@" >&2
}

echo_abort() {
	local errno="$1"; shift
	echo -e "!> ERROR: $@" >&2
	exit "$errno"
}

# Early checking of the system
#
[ -n "$( type -p readlink )" ] ||
	echo_abort 1 '`readlink` tool not found'

readlink -f /bin/sh 2>&1 > /dev/null 
[ $? -eq 0 ] ||
	echo_abort 1 '`readlink` doesnt support -f, please update it.'

# find libsde.in
#
if [ -z "$SDEROOT" ]; then
	# finding the root of the tree where we are stand
	#
	SDEROOT=$( pwd -P )
	while [ "$SDEROOT" -a ! -r "$SDEROOT/lib/libsde.in" ]; do
		SDEROOT="${SDEROOT%/*}"
	done
fi

# if libsde.in was not found, try a fallback
#
if [ ! -r "$SDEROOT/lib/libsde.in" ]; then
	SDEROOT="$( readlink -f "$0" )"; SDEROOT="${SDEROOT%/bin/sde}"
 
	[ -r "$SDEROOT/lib/libsde.in" ] ||
		echo_abort 1 'SDEROOT not found.'
fi

# switching to the right sde wrapper (SDEROOT specific)
#
if [ "$( readlink -f "$0" )" != "$SDEROOT/bin/sde" ]; then
	if [ "$1" == "--loop" ]; then
		echo_abort 2 'loop detected, abort.'
	else
		exec "$SDEROOT/bin/sde" --loop "$@"
	fi
elif [ "$1" == "--loop" ]; then
	shift
fi

# load corresponding library for sh scripts
#
. "$SDEROOT/lib/libsde.in"

if [ $# -eq 0 ]; then
	command="help"
elif [ -x "$SDEROOT/bin/sde-$1" ]; then
	command="$1"; shift
elif grep -q "^#Alias: $1$" $SDEROOT/bin/sde-* 2> /dev/null; then
	# use alias
	command="$( grep -l "^#Alias: $1$" $SDEROOT/bin/sde-* 2> /dev/null |
		head -n 1 | sed -e 's,.*/sde-,,' )"
	shift
else
	# unknown command
	echo_error "Command '$COLOR_INFO$1$COLOR_NORMAL' not understood."
	# call help without arguments
	set --
	command="help"
fi

[ -x "$SDEROOT/bin/sde-$command" ] ||
	echo_abort 2 "Can't execute '$COLOR_INFO$SDEROOT/bin/sde-$command$COLOR_NORMAL', sorry."

exec "$SDEROOT/bin/sde-$command" "$@"