#!/bin/sh
######################################################################
# ccache-update-links                                    December 2005
# Horms                                             horms@verge.net.au
#
# ccache-update-links
# Updates symlinks for use with ccache
# Copyright (C) 2005  Horms <horms@verge.net.au>
# 
# 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, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
# 02111-1307  USA
#
######################################################################

set -e

if [ -z "$SEARCH_PATH" ]; then
	SEARCH_PATH=${PATH}
fi

TARGETS="cc gcc gc++"
CCACHE_BIN="`which ccache`"

usage ()
{
	echo "Usage: ccache-update-links DIR" >&2
	exit 1
}

stat_id ()
{
	if [ -e "$1" ]; then
		stat --format=%d:%i "$1"
	fi
}

if [ $# -ne 1 ]; then
	usage
fi

case $1 in
	-*) usage ;;
esac

DEST="$1/"
if [ ! -e "$DEST" ]; then
	echo "ccache-update-links: $DEST does not exist" >&2
	exit 1
fi
DEST_ID=`stat_id "$DEST"`

for d in `echo $SEARCH_PATH | tr ':' '\n'`; do
	SOURCE_ID=`stat_id "$d"`
	if [ -z "$SOURCE_ID" -o "$SOURCE_ID" = "$DEST_ID" ]; then
		continue
	fi
	for t in $TARGETS; do
		cd "$d"
		for b in $t $t-* *-$t *-$t-*; do
			if [ ! -x "$b" -o -d "$b" ]; then
				continue;
			fi
			if [ -L "$DEST/$b" ]; then
				rm "$DEST/$b"
			fi
			(cd "$DEST"; ln -s "$CCACHE_BIN" "$b"; )
		done
	done
	
done