#!/bin/sh

#
# arguments:
#	$1 - target H file
#	$2 - fallback version string
#	$3 - os name {linux|darwin|win}
#
# doesn't have much error checking!
# should be started from where .git is!
#

if [ "$#" -lt 3 ]; then
	echo "ERROR: missing arguments";
	exit 1;
fi

# set OS and TARGET
TARGET=$1
TARGET_TEMP=$TARGET.tmp
VERSION=$2
OS=$3

# get the full version: git based or hardcoded from .gitversion or the fallback version string
if gitpwd=`git rev-parse --show-toplevel 2> /dev/null`; then
	FULL_VER=`sh "$gitpwd/scripts/get-version" linux`
else
	FULL_VER=`cat .gitversion 2> /dev/null || echo $VERSION`
fi

# grab some strings from get-version
CANONICAL_VER=`sh ./scripts/get-version full $FULL_VER`
OS_USABLE_VER=`sh ./scripts/get-version $OS $FULL_VER`

# write to a temp file
echo "#define VERSION_STRING \"$OS_USABLE_VER\"" > $TARGET_TEMP
echo "#define GIT_VERSION_STRING \"$FULL_VER\"" >> $TARGET_TEMP
echo "#define CANONICAL_VERSION_STRING \"$CANONICAL_VER\"" >> $TARGET_TEMP

# if the target file is missing create it
if [ ! -f $TARGET ]; then
	CMD=`touch $TARGET`
fi

# if the temp file and the target file differ, replace the target file with the temp file
CMD=`diff -q $TARGET $TARGET_TEMP || cp $TARGET_TEMP $TARGET`

# remove the temp file
CMD=`rm -f $TARGET_TEMP`