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# ===========================================================================
# http://autoconf-archive.cryp.to/acltx_class_cweb.html
# ===========================================================================
#
# SYNOPSIS
#
# ACLTX_CLASS_CWEB(VARIABLETOSET[,ACTION-IF-FOUND[,ACTION-IF-NOT-FOUND]])
#
# DESCRIPTION
#
# This macros test if the class cweb exists and works. It sets
# VARIABLETOSET to yes or no If ACTION-IF-FOUND (and ACTION-IF-NOT-FOUND)
# are set, do the correct action.
#
# The cweb package is used to provide LaTeX support atop Knuth's CWEB
# literate programming environment. The test LaTeX document requires some
# additional logic beyond ACLTX_CLASS because the cweb package expects
# cweave to insert some boilerplate. Both macros for the original CWEB and
# the compatible offshoot CWEBx are tested here. See
# http://www.ctan.org/tex-archive/help/Catalogue/entries/cweb-latex.html.
#
# LICENSE
#
# Copyright (c) 2008 Rhys Ulerich <rhys.ulerich@gmail.com>
# Copyright (c) 2008 Boretti Mathieu <boretti@eig.unige.ch>
#
# This library is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or (at
# your option) any later version.
#
# This library 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 Lesser
# General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this library. If not, see <http://www.gnu.org/licenses/>.
AC_DEFUN([ACLTX_CLASS_CWEB],[
ACLTX_PACKAGE_LOCATION(cweb.cls,ac_cv_latex_class_cweb_location)
if test "[$]ac_cv_latex_class_cweb_location" = "no" ; then
AC_MSG_WARN([Unable to locate the cweb.cls file])
ac_cv_latex_class_cweb="no";
else
AC_CACHE_CHECK(
[for usability of class cweb with Levy/Knuth CWEB],
[ac_cv_latex_class_cweb_CWEB],[
_ACLTX_TEST([
\input cwebmac
\documentclass{cweb}
\begin{document}
\M{1}
\end{document}
\fi
\fin
], [ac_cv_latex_class_cweb_CWEB])
])
AC_CACHE_CHECK(
[for usability of class cweb with van Leeuwen CWEBx],
[ac_cv_latex_class_cweb_CWEBx],[
_ACLTX_TEST([
\input cwebcmac
\documentclass{cweb}
\begin{document}
\M{1}
\end{document}
\fi
\fin
],[ac_cv_latex_class_cweb_CWEBx])
])
ac_cv_latex_class_cweb=no
if test "$ac_cv_latex_class_cweb_CWEB" = yes; then
ac_cv_latex_class_cweb=yes
fi
if test "$ac_cv_latex_class_cweb_CWEBx" = yes; then
ac_cv_latex_class_cweb=yes
fi
fi
$1=$[ac_cv_latex_class_cweb] ; export $1
AC_SUBST($1)
if test "$[ac_cv_latex_class_cweb]" = yes ; then
dnl NOP required
:
ifelse([$2], , ,[$2])
else
dnl NOP required
:
ifelse([$3], , ,[$3])
fi
])
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