configure

#!/bin/sh

this_prog=`basename $0`
DEFAULT_DIST='.pps'
DIST=

usage()
{
cat <<HELP
Usage: $1 [-h|--help]

Options:
    -h, --help  : print this message

Parameters:
    --dist=DIST : specify the distribution (defaults to '$DEFAULT_DIST')
HELP
}

version()
{
    description=$(git describe --always HEAD)
    version=$(echo $description | cut -d'-' -f1)
    release=$(echo $description | cut -d'-' -f2)
    if [ "$release" = "$version" ]; then
	# We are either at a tag or we don't have any tag yet
	# Check to see if $version has '.'
	if [ ${version%%.*} = "$version" ]; then
	    # We don't have . in $version
	    echo "0.0-1"
	else
	    # We are at a tag
	    echo "$version-1"
	fi
    else
	release=$((release+1))
	echo "${version}-$release"
    fi
}

parse_args()
{
    local prev
    local optarg
    local opt

    for opt; do
	if [ -n "$prev" ]; then
	    eval "$prev=\$opt"
	    prev=
	    continue
	fi

	optarg=`expr "x$opt" : 'x[^=]*=\(.*\)'`
	case "$opt" in
	    -h | --h | -help | --help)
		usage $this_prog
		exit ;;
	    -dist | --dist)
		prev=DIST
		;;
	    -dist=* | --dist=*)
		DIST=$optarg
		;;
	    -*)
		cat <<EOF
Error: unrecognized option $opt
Try $this_prog --help for more information.

EOF
		exit 2 ;;
	esac
    done

    VERSION=$(version | cut -d'-' -f1)
    RELEASE=$(version | cut -d'-' -f2)
    [ -n "$DIST" ] || DIST=$DEFAULT_DIST

    echo "VERSION=$VERSION"
    echo "RELEASE=$RELEASE"
    echo "DIST=$DIST"
}

replace()
{
    local key
    local prev
    local opt
    local optarg
    local script="sed"
    local input

    for opt; do
	if [ -n "$prev" ]; then
	    script="$script -e 's,@$prev@,$opt,g'"
	    prev=
	    continue
	fi

	optarg=`expr "x$opt" : 'x[^=]*=\(.*\)'`
	case "$opt" in
	    --*=*)
		key=${opt#--}
		key=${key%%=*}
		script="$script -e 's,@$key@,$optarg,g'"
		;;
	    *)
		if [ -z "$input" ]; then
		    input=$opt
		else
		    input="$input $opt"
		fi
		;;
	esac
    done

    echo "input=$input"
    if [ "$script" != "sed" ]; then
	for f in $input; do
	    echo "Processing $f..."
	    cat $f | eval "$script" > ${f%.*}
	done
    else
	echo "Nothing to be done for replace()"
    fi
    return 0
}

parse_args $@
replace --VERSION=$VERSION \
    --RELEASE=$RELEASE \
    --DIST=$DIST \
    $(find . -type f -name '*.in')