#!/bin/bash
#
# ccache-config - helper script for ccache and its ebuild
#
# Copyright 2003 Superlucidity Services, LLC 
# This program licensed under the GNU GPL version 2.
#
# This script developed by Zachary T Welch at Superlucidity Services, LLC
#  it was cloned from the distcc-config script
# 
# Additional features to come; this provides a starting point

LIBDIR="lib"

# this should be getopt'd someday (override with CC_QUIET=1)
CC_VERBOSE=1

cc_echo()
{
	[ -z "${CC_QUIET}" -a -n "${CC_VERBOSE}" ] && echo "$*"
}

###
# the following functions manage the ccache symlinks
#  they allow the user or other scripts (namely gcc-config) to
#  automatically update ccache's links when upgrading toolchains
#
cc_path()
{
	echo ${MROOT%/}/usr/${LIBDIR}/ccache/bin/$1
}

cc_remove_link()
{
	local t=$(cc_path "$1")
	if [ -L ${t} ]
	then
		cc_echo "Removing ${t}..."
		rm -f "${t}"
	fi
}

cc_install_link()
{
	# Search the PATH for the specified compiler
	#  then create shadow link in /usr/lib/ccache/bin to ccache
	
	if [ -n "$(type -p ${1})" ]
	then 
		# first be sure any old link is removed
		CC_QUIET=1 cc_remove_link "${1}"

		# then create the new link
		local t=$(cc_path "$1")
		cc_echo "Creating ccache shadow link: ${t}..."
		mkdir -p -m 0755 "${t%/*}" && ln -s /usr/bin/ccache "${t}"
	fi
}

cc_links()
{
	local a
	for a in gcc cc c++ g++ icc icpc clang clang++
	do
		if [ -n "${2}" ]
		then
			# gcc-config doesn't install ${CHOST}-cc, so until
			# it does, don't install a ccache symlink for it
			[ "${a}" = "cc" ] && continue
			a="${2}-${a}"
		fi
		eval "cc_${1}_link" "${a}"
	done
}

###
# main routine

case "${1}" in
	--install-links )
		cc_links install "${2}"
		;;
	--remove-links )
		cc_links remove "${2}"
		;;
	* )
		echo "usage: ${0} {--install-links|--remove-links} [ CHOST ]"
		;;
esac