#!/bin/bash

# You may want to set PORTAGE_TMPDIR= to a slow directory like an NFS share.
# Also, ensure that MAKEOPTS=-jN where N is high.

usage() {
	echo "$0 [champion] [contender] <rounds>"
	echo "  champion - The original ebuild to be compiled"
	echo "  contender - The revised ebuild to be compiled"
	echo "  rounds - The number of times each is compiled"
	exit 1
}

champion="${1}"
contender="${2}"
rounds="${3}"
champion_down="0"
contender_down="0"

# Configuration

if [ -z ${champion} ] || [ -z ${contender} ] || [ ${champion} = -h* ] ; then
	# Are both required arguments present?
	usage
elif [ ! -f ${champion} ] || [ ! -f ${contender} ]; then
	# Are both required arguments files?
	usage
elif [ -z ${rounds} ]; then
	# Is the third argument set? If not, set rounds to 10
	rounds=10
fi

# Set up the scoreboard
echo "EBUILD	BUILD-NR	EXIT_STATUS"

for i in $(seq 1 ${rounds}); do
	# Champion gets to go first
	echo -n "${champion}	$i/${rounds}	"

	for j in clean compile; do	
		ebuild ${champion} ${j} >/dev/null 2>&1
	done

	exit_status="${?}"
	[ "${exit_status}" == "0" ] || champion_down=$((${champion_down} + 1))
	echo "${exit_status}"

	# Contender's turn
	echo -n "${contender}	$i/${rounds}	"

	for j in clean compile; do	
		ebuild ${contender} ${j} >/dev/null 2>&1
	done

	exit_status="${?}"
	[ "${exit_status}" == "0" ] || contender_down=$((${contender_down} +1)) 
	echo "${exit_status}"
done

# Clean the build directories one last time
for i in ${champion} ${contender}; do
	ebuild ${i} clean > /dev/null 2>&1
done

# Announcement
echo
echo "At the end of ${rounds} rounds, the score is"
echo "${champion}	:	${champion_down} failures"
echo "${contender}	:	${contender_down} failures"