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# ===========================================================================
# http://autoconf-archive.cryp.to/ac_very_nice.html
# ===========================================================================
#
# SYNOPSIS
#
# AC_VERY_NICE
#
# DESCRIPTION
#
# A macro to check the options of nice, in order to have a VERY_NICE
# variable which runs a program at the lowest priority VERY_NICE is
# undefined if we don't find the proper options, so you can safely use:
#
# @VERY_NICE@ mycommand
#
# in a shell script.
#
# The VERY_NICE variable includes the placeholder NICE_VALUE that you have
# to instantiate at run-time. If you give a argument to AC_VERY_NICE, it
# will be used as an argument of nice for testing and included in
# VERY_NICE instead of the above placeholder.
#
# LICENSE
#
# Copyright (c) 2008 Stephane Bortzmeyer <bortzmeyer@pasteur.fr>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.
#
# As a special exception, the respective Autoconf Macro's copyright owner
# gives unlimited permission to copy, distribute and modify the configure
# scripts that are the output of Autoconf when processing the Macro. You
# need not follow the terms of the GNU General Public License when using
# or distributing such scripts, even though portions of the text of the
# Macro appear in them. The GNU General Public License (GPL) does govern
# all other use of the material that constitutes the Autoconf Macro.
#
# This special exception to the GPL applies to versions of the Autoconf
# Macro released by the Autoconf Archive. When you make and distribute a
# modified version of the Autoconf Macro, you may extend this special
# exception to the GPL to apply to your modified version as well.
AC_DEFUN([AC_VERY_NICE],[
if test "x$1" != "x"; then
NICE_VALUE=$1
else
NICE_VALUE=20
fi
AC_CHECK_PROGS(TEST_NICE, date)
AC_CHECK_PROGS(NICE, nice, )
AC_MSG_CHECKING(syntax of nice)
if test "x$NICE" != "x"; then
if ( $NICE -n $NICE_VALUE $TEST_NICE > /dev/null 2>&1 ) ; then
VERY_NICE="$NICE -n $NICE_VALUE"
else
if ( $NICE -$NICE_VALUE $TEST_NICE > /dev/null 2>&1 ) ; then
VERY_NICE="$NICE -$NICE_VALUE"
fi
fi
fi
if test "x$1" = "x"; then
VERY_NICE=`echo $VERY_NICE | sed "s/$NICE_VALUE/NICE_VALUE/"`
fi
AC_MSG_RESULT($VERY_NICE)
AC_SUBST(VERY_NICE)
])
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