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# SYNOPSIS
#
# AX_PROG_HIGHLIGHT(ACTION-IF-NOT-FOUND)
#
# DESCRIPTION
#
# Check whether the highlight command is available on system, and provide
# the HAVE_HIGHLIGHT Automake conditional.
#
# ACTION-IF-NOT-FOUND is shell commands to execute on failure.
#
# LICENSE
#
# Copyright (c) 2017 Richard Braun <rbraun@sceen.net>
#
# 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 3 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 <https://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([AX_PROG_HIGHLIGHT],
[AC_ARG_VAR([HIGHLIGHT], [path to highlight command])
AC_CHECK_PROG([HIGHLIGHT], [highlight], [highlight])
AS_IF([test x"$HIGHLIGHT" = x], [$1])
AM_CONDITIONAL([HAVE_HIGHLIGHT], [test x"$HIGHLIGHT" != x])])
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