# ===========================================================================
#       https://www.gnu.org/software/autoconf-archive/ax_check_icu.html
# ===========================================================================
#
# SYNOPSIS
#
#   AX_CHECK_ICU(version, action-if, action-if-not)
#
# DESCRIPTION
#
#   Defines ICU_LIBS, ICU_CFLAGS, ICU_CXXFLAGS. See icu-config(1) man page.
#
# LICENSE
#
#   Copyright (c) 2008 Akos Maroy <darkeye@tyrell.hu>
#
#   Copying and distribution of this file, with or without modification, are
#   permitted in any medium without royalty provided the copyright notice
#   and this notice are preserved. This file is offered as-is, without any
#   warranty.

#serial 8

AU_ALIAS([AC_CHECK_ICU], [AX_CHECK_ICU])
AC_DEFUN([AX_CHECK_ICU], [
  succeeded=no

  if test -z "$ICU_CONFIG"; then
    AC_PATH_PROG(ICU_CONFIG, icu-config, no)
  fi

  if test -z "$PKG_CONFIG"; then
    AC_PATH_PROG(PKG_CONFIG, pkg-config, no)
  fi

  if test "$ICU_CONFIG" = "no" && test "$PKG_CONFIG" = "no" ; then
    echo "*** Neither icu-config nor pkg-config could not be found."
    echo "*** Make sure one of them is in your path, and that taglib"
    echo "*** is properly installed. Or see https://icu.unicode.org/"
  fi

  if test "$ICU_CONFIG" != "no" ; then
    ICU_VERSION=`$ICU_CONFIG --version`
    AC_MSG_CHECKING(for ICU >= $1 via icu-config)
        VERSION_CHECK=`expr $ICU_VERSION \>\= $1`
        if test "$VERSION_CHECK" = "1" ; then
            AC_MSG_RESULT(yes)
            succeeded=yes

            AC_MSG_CHECKING(ICU_CPPFLAGS)
            ICU_CPPFLAGS=`$ICU_CONFIG --cppflags`
            AC_MSG_RESULT($ICU_CPPFLAGS)

            AC_MSG_CHECKING(ICU_CFLAGS)
            ICU_CFLAGS=`$ICU_CONFIG --cflags`
            AC_MSG_RESULT($ICU_CFLAGS)

            AC_MSG_CHECKING(ICU_CXXFLAGS)
            ICU_CXXFLAGS=`$ICU_CONFIG --cxxflags`
            AC_MSG_RESULT($ICU_CXXFLAGS)

            AC_MSG_CHECKING(ICU_LIBS)
            ICU_LIBS=`$ICU_CONFIG --ldflags`
            AC_MSG_RESULT($ICU_LIBS)
        else
            ICU_CPPFLAGS=""
            ICU_CFLAGS=""
            ICU_CXXFLAGS=""
            ICU_LIBS=""
            ## If we have a custom action on failure, don't print errors, but
            ## do set a variable so people can do so.
            ifelse([$3], ,echo "can't find ICU >= $1 via icu-config",)
        fi
  fi

  if test "$succeeded" != "yes" && test "$PKG_CONFIG" != "no" ; then
    AC_MSG_CHECKING(for ICU >= $1 via pkg-config)
        if $PKG_CONFIG --atleast-version=$1 icu-i18n ; then
            AC_MSG_RESULT(yes)
            succeeded=yes

            AC_MSG_CHECKING(ICU_CPPFLAGS)
            ICU_CPPFLAGS=`$PKG_CONFIG --variable=CPPFLAGS icu-i18n`
            AC_MSG_RESULT($ICU_CPPFLAGS)

            AC_MSG_CHECKING(ICU_CFLAGS)
            ICU_CFLAGS=`$PKG_CONFIG --variable=CFLAGS icu-i18n`
            AC_MSG_RESULT($ICU_CFLAGS)

            AC_MSG_CHECKING(ICU_CXXFLAGS)
            ICU_CXXFLAGS=`$PKG_CONFIG --variable=CXXFLAGS icu-i18n`
            AC_MSG_RESULT($ICU_CXXFLAGS)

            AC_MSG_CHECKING(ICU_LIBS)
            ICU_LIBS=`$PKG_CONFIG --libs icu-i18n`
            AC_MSG_RESULT($ICU_LIBS)
        else
            ICU_CPPFLAGS=""
            ICU_CFLAGS=""
            ICU_CXXFLAGS=""
            ICU_LIBS=""
            ## If we have a custom action on failure, don't print errors, but
            ## do set a variable so people can do so.
            ifelse([$3], ,echo "can't find ICU >= $1 via pkg-config",)
        fi
  fi

  if test "$succeeded" = "yes"; then
     AC_SUBST(ICU_CPPFLAGS)
     AC_SUBST(ICU_CFLAGS)
     AC_SUBST(ICU_CXXFLAGS)
     AC_SUBST(ICU_LIBS)
     ifelse([$2], , :, [$2])
  else
     ifelse([$3], , AC_MSG_ERROR([Library requirements (ICU) not met.]), [$3])
  fi
])