dnl AS_DOCBOOK([, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]])

dnl checks if xsltproc can build docbook documentation

dnl (which is possible if the catalog is set up properly

dnl I also tried checking for a specific version and type of docbook

dnl but xsltproc seemed to happily run anyway, so we can't check for that

dnl and version

dnl this macro takes inspiration from

dnl http://www.movement.uklinux.net/docs/docbook-autotools/configure.html

AC_DEFUN([AS_DOCBOOK],

[

  XSLTPROC_FLAGS=--nonet

  DOCBOOK_ROOT=

  TYPE_LC=xml

  TYPE_UC=XML

  DOCBOOK_VERSION=4.1.2

  if test -n "$XML_CATALOG_FILES"; then

    oldIFS=$IFS

    IFS=' '

    for xml_catalog_file in $XML_CATALOG_FILES; do

      if test -f $xml_catalog_file; then

        XML_CATALOG=$xml_catalog_file

        CAT_ENTRY_START='

        CAT_ENTRY_END='-->'

        break

      fi

    done

    IFS=$oldIFS

  elif test ! -f /etc/xml/catalog; then

    for i in /usr/share/sgml/docbook/stylesheet/xsl/nwalsh /usr/share/sgml/docbook/xsl-stylesheets/ /usr/local/share/xsl/docbook ;

    do

      if test -d "$i"; then

        DOCBOOK_ROOT=$i

      fi

    done

  else

    XML_CATALOG=/etc/xml/catalog

    CAT_ENTRY_START='

    CAT_ENTRY_END='-->'

  fi

  dnl We need xsltproc to process the test

  AC_CHECK_PROG(XSLTPROC,xsltproc,xsltproc,)

  XSLTPROC_WORKS=no

  if test -n "$XSLTPROC"; then

    AC_MSG_CHECKING([whether xsltproc docbook processing works])

    if test -n "$XML_CATALOG"; then

      DB_FILE="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"

    else

      DB_FILE="$DOCBOOK_ROOT/xhtml/docbook.xsl"

    fi

    $XSLTPROC $XSLTPROC_FLAGS $DB_FILE >/dev/null 2>&1 << END

<book id="test">

</book>

END

    if test "$?" = 0; then

      XSLTPROC_WORKS=yes

    fi

    AC_MSG_RESULT($XSLTPROC_WORKS)

  fi

  if test "x$XSLTPROC_WORKS" = "xyes"; then

    dnl execute ACTION-IF-FOUND

    ifelse([$1], , :, [$1])

  else

    dnl execute ACTION-IF-NOT-FOUND

    ifelse([$2], , :, [$2])

  fi

  AC_SUBST(XML_CATALOG)

  AC_SUBST(XSLTPROC_FLAGS)

  AC_SUBST(DOCBOOK_ROOT)

  AC_SUBST(CAT_ENTRY_START)

  AC_SUBST(CAT_ENTRY_END)

])