#!/bin/sh

set -e

[ ! -e .gitmodules ] || [ ! -e .git ] || {

    echo "autogen.sh: updating git submodules"

    git submodule init

    git submodule update

}

case "$(uname)" in

    Darwin)

        LIBTOOLIZE=${LIBTOOLIZE:-glibtoolize}

        ;;

    *)

        LIBTOOLIZE=${LIBTOOLIZE:-libtoolize}

        ;;

esac

AUTORECONF=${AUTORECONF:-autoreconf}

ACLOCAL=${ACLOCAL:-aclocal}

AUTOCONF=${AUTOCONF:-autoconf}

AUTOHEADER=${AUTOHEADER:-autoheader}

AUTOMAKE=${AUTOMAKE:-automake}

# Check we have all tools installed

check_command() {

    command -v "${1}" > /dev/null 2>&1 || {

        >&2 echo "autogen.sh: could not find \`$1'. \`$1' is required to run autogen.sh."

        exit 1

    }

}

check_command "$LIBTOOLIZE"

check_command "$AUTORECONF"

check_command "$ACLOCAL"

check_command "$AUTOCONF"

check_command "$AUTOHEADER"

check_command "$AUTOMAKE"

# Absence of pkg-config or misconfiguration can make some odd error

# messages, we check if it is installed correctly. See:

#  https://blogs.oracle.com/mandy/entry/autoconf_weirdness

#

# We cannot just check for pkg-config command, we need to check for

# PKG_* macros. The pkg-config command can be defined in ./configure,

# we cannot tell anything when not present.

check_pkg_config() {

    grep -q '^AC_DEFUN.*PKG_CHECK_MODULES' aclocal.m4 || {

        cat <<EOF >&2

autogen.sh: could not find PKG_CHECK_MODULES macro.

  Either pkg-config is not installed on your system or

  \`pkg.m4' is missing or not found by aclocal.

  If \`pkg.m4' is installed at an unusual location, re-run

  \`autogen.sh' by setting \`ACLOCAL_FLAGS':

    ACLOCAL_FLAGS="-I <prefix>/share/aclocal" ./autogen.sh

EOF

        exit 1

    }

}

echo "autogen.sh: start libtoolize to get ltmain.sh"

${LIBTOOLIZE} --copy --force

echo "autogen.sh: reconfigure with autoreconf"

${AUTORECONF} -vif -I m4 || {

    echo "autogen.sh: autoreconf has failed ($?), let's do it manually"

    for dir in $PWD *; do

        [ -d "$dir" ] || continue

        [ -f "$dir"/configure.ac ] || [ -f "$dir"/configure.in ] || continue

	echo "autogen.sh: configure `basename $dir`"

	(cd "$dir" && ${ACLOCAL} -I m4 ${ACLOCAL_FLAGS})

        if [ x"$dir" = x"$PWD" ]; then

            (cd "$dir" && check_pkg_config)

        fi

	(cd "$dir" && ${LIBTOOLIZE} --automake --copy --force)

	(cd "$dir" && ${ACLOCAL} -I m4 ${ACLOCAL_FLAGS})

	(cd "$dir" && ${AUTOCONF} --force)

	(cd "$dir" && ${AUTOHEADER})

	(cd "$dir" && ${AUTOMAKE} --add-missing --copy --force-missing)

    done

}

echo "autogen.sh: for the next step, run ./configure"

exit 0