dnl Copyright 2009,2010 Free Software Foundation, Inc.

dnl 

dnl This file is part of GNU Radio

dnl 

dnl GNU Radio is free software; you can redistribute it and/or modify

dnl it under the terms of the GNU General Public License as published by

dnl the Free Software Foundation; either version 3, or (at your option)

dnl any later version.

dnl 

dnl GNU Radio is distributed in the hope that it will be useful,

dnl but WITHOUT ANY WARRANTY; without even the implied warranty of

dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

dnl GNU General Public License for more details.

dnl 

dnl You should have received a copy of the GNU General Public License

dnl along with GNU Radio; see the file COPYING.  If not, write to

dnl the Free Software Foundation, Inc., 51 Franklin Street,

dnl Boston, MA 02110-1301, USA.

AC_DEFUN([GR_GIT],[

  dnl Identify git binary

  AC_PATH_PROG([GIT],[git])

  dnl If it exists, get either 'git describe' or fallback to current commit

  if test x$GIT != x ; then

    AC_MSG_CHECKING([existence of git version control directory])

    if test -d $srcdir/.git ; then

      AC_MSG_RESULT([ok])

      AC_MSG_CHECKING([git description of current commit])

      if (cd $srcdir && $GIT describe >/dev/null 2>&1); then

        GIT_DESCRIBE=`cd $srcdir && $GIT describe --abbrev=8 --long`

        # Release candidate tags create an extra -rcX field

	case $GIT_DESCRIBE in

	  *-*-*-*)

	    GIT_TAG=`echo $GIT_DESCRIBE | cut -f -2 -d '-'`

	    GIT_SEQNO=`echo $GIT_DESCRIBE | cut -f 3 -d '-'`

	    GIT_COMMIT=`echo $GIT_DESCRIBE | cut -f 4 -d '-' | cut -f 2- -d 'g'`

	    ;;

	  *-*-*)

	    GIT_TAG=`echo $GIT_DESCRIBE | cut -f 1 -d '-'`

 	    GIT_SEQNO=`echo $GIT_DESCRIBE | cut -f 2 -d '-'`

	    GIT_COMMIT=`echo $GIT_DESCRIBE | cut -f 3 -d '-' | cut -f 2- -d 'g'`

	    ;;

	esac

	AC_MSG_RESULT([$GIT_DESCRIBE])

      else

        AC_MSG_RESULT([no tag in history, using current commit])

	GIT_TAG=''

	GIT_SEQNO=''

	GIT_COMMIT=`cd $srcdir && $GIT describe --always --abbrev=8`

      fi

    else

      AC_MSG_RESULT([not found])

    fi

    AC_SUBST([GIT_DESCRIBE])

    AC_SUBST([GIT_TAG])

    AC_SUBST([GIT_SEQNO])

    AC_SUBST([GIT_COMMIT])

  fi

])