# Copyright 1999-2003 Gentoo Technologies, Inc.
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/eclass/gnuconfig.eclass,v 1.7 2003/03/10 21:44:59 wwoods Exp $
#
# Author: Will Woods <wwoods@gentoo.org>
#
# This eclass is used to automatically update files that typically come with 
# automake to the newest version available on the system. The most common use
# of this is to update config.guess and config.sub when configure dies from
# misguessing your canonical system name (CHOST). It can also be used to update
# other files that come with automake, e.g. depcomp, mkinstalldirs, etc.
#
# usage: gnuconfig_update [file1 file2 ...]
# if called without arguments, config.guess and config.sub will be updated.
# All files in the source tree ($S) with the given name(s) will be replaced
# with the newest available versions chosen from the list of locations in 
# gnuconfig_findnewest(), below.

ECLASS=gnuconfig
INHERITED="$INHERITED $ECLASS"

newdepend sys-devel/automake

DESCRIPTION="Based on the ${ECLASS} eclass"

# Wrapper function for gnuconfig_do_update. If no arguments are given, update
# config.sub and config.guess (old default behavior), otherwise update the
# named files. 
gnuconfig_update() {
    if [ $# -gt 0 ] ; then 
	gnuconfig_do_update $* 
    else
	gnuconfig_do_update config.sub config.guess
    fi
}

# Copy the newest available version of specified files over any old ones in the
# source dir. This function shouldn't be called directly - use gnuconfig_update
gnuconfig_do_update() {
    local configsubs_dir="$(gnuconfig_findnewest)"
    local target targetlist file
    einfo "Using GNU config files from ${configsubs_dir}"
    for file in $* ; do 
	if [ ! -r ${configsubs_dir}/${file} ] ; then
	    eerror "Can't read ${configsubs_dir}/${file}, skipping.."
	    continue
	fi
	targetlist=`find ${S} -name "${file}"`
	if [ -n "$targetlist" ] ; then
	    for target in $targetlist; do
		einfo "Updating ${target/$S\//}"
		cp -f ${configsubs_dir}/${file} ${target}
		eend $!
	    done
	else
	    ewarn "No ${file} found in ${S}, skipping.."
	fi
    done
}

# this searches the standard locations for the newest config.{sub|guess}, and
# returns the directory where they can be found.
gnuconfig_findnewest() {
    local locations="/usr/share/automake-1.6/config.sub \
                         /usr/share/automake-1.5/config.sub \
                         /usr/share/automake-1.4/config.sub \
                         /usr/share/libtool/config.sub"
    grep -s '^timestamp' ${locations} | sort -n -t\' -k2 | tail -1 | sed 's,/config.sub:.*$,,'
}