#!/bin/bash


# description: 
# this script is used to generated buildinfo.h in MachineLearning/CNTK which will contain the following infomation to be displayed at runtime: 
# 	CUDA_PATH 	(if exists) 
#	CUB_PATH	(if exists)
#	GIT_COMMIT	
#	GTT_BRANCH
#	BUILDTYPE	(release/debug)
#	MATHLIB		(MKL/ACML)

usage ()
{
	echo "usage: $0 <Config.make>"
	echo "-------------------------------------------------------------------"
	echo "This script is used to generate buildinfo.h in MachineLearning/CNTK"
	echo "This script needs to be called from the top level directory of CNTK project"
	echo "This script assumes git can be used"
	echo "This script assumes Config.make has been made"
	echo "-------------------------------------------------------------------"
	if [ ! -z "$1" ] ; then 
		echo "ERROR message: $1"
	fi
	exit 1
}

Has_Git()
{
	if hash git 2>/dev/null; then
		return 0
	else
		return 1
	fi
}

makebuildinfo()
{
	target=$1
	BUILDTYPE=$2
	MATHLIB=$3
	GIT_COMMIT=$4
	GIT_BRANCH=$5
	CUDA_PATH=$6
	CUB_PATH=$7
	
	printf "#ifndef _BUILDINFO_H\n" 			> 	$target
	printf "#define _BUILDINFO_H\n" 			>>	$target
	printf "#define _GIT_EXIST\n"				>> 	$target 
	printf "#define _MATHLIB_ \"%s\"\n" $MATHLIB		>> 	$target
	printf "#define _BUILDSHA1_ \"%s\"\n" $GIT_COMMIT   	>>  	$target
	printf "#define _BUILDBRANCH_ \"%s\"\n" $GIT_BRANCH 	>>	$target 
	if [ ! -z "$CUDA_PATH" ]; then 
		printf "#define _CUDA_PATH_ \"%s\"\n" $CUDA_PATH >> $target
	fi
	if [ ! -z "$CUB_PATH" ]; then 
		printf "#define _CUB_PATH_ \"%s\"\n"  $CUB_PATH  >> $target
	fi
	printf "#define _BUILDTYPE_ \"%s\"\n" $BUILDTYPE    	>> 	$target
	printf "#endif\n" 					>>	$target
}

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

config=$1

# 1. check whether we have git and what is the sha-1 value 
if Has_Git; then has_git=1; else has_git=0; usage "git not exist"; fi
GIT_COMMIT=`git rev-parse HEAD`
GIT_BRANCH=`git rev-parse --abbrev-ref HEAD`

# 2. looking into Config.make
if [ ! -e $config ] ; then 
	usage "Config.make not exists"
fi
source $config

# 3. whether we have CUDA_PATH 
if [ -z "${CUDA_PATH+x}" ]; then 
	CUDAPATH=""
else
	CUDAPATH=$CUDA_PATH
fi

# 4. whether we have CUB_PATH
if [ -z "${CUB_PATH+x}" ]; then 
	CUBPATH=""
else
	CUBPATH=$CUB_PATH
fi

# 5. make buildinfo.h 
target=MachineLearning/CNTK/buildinfo.h
if [ ! -d MachineLearning ] ; then 
	usage
fi
if [ -e MachineLearning/CNTK/buildinfo.h ] ; then 
	rm MachineLearning/CNTK/buildinfo.h
fi
makebuildinfo $target $BUILDTYPE $MATHLIB $GIT_COMMIT $GIT_BRANCH $CUDAPATH $CUBPATH