acltx_class_cweb

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.

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
])

Copyright © 2008 Rhys Ulerich <rhys.ulerich@gmail.com>
Copyright © 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/>.