#!/bin/bash

#

# docbook_convertToPdfFromSgml.sh -- This function transforms DocBook

# files which have set the SGML DTD in them.  To produce PDF from

# DocBook SGML DTD, we take the DocBook XML DTD file and change its

# DTD from XML to SGML. Since XML is SGML shoudn't be any problem.

# Once the DTD has been changed from XML to SGML, we use openjade

# (through `jw' shell script) to convert the SGML-based DocBook file

# to PDF.  Customization can be achieved through DSL

# (docbook-style-dsssl-1.79-4.1) shipped in this distribution.

#

# In this configuration and using default configuration settings, I've

# presented the following problems:

#

#   1. It is not possible to produce localized PDF outputs through

#   `xml2po', the default way of producing localized content inside

#   `centos-art.sh' script.

#

# In this configuration and using default configuration settins, I've

# presented the following advantages:

#

#   1. The PDF output produced from SGML-based files seem to be better

#   looking an less buggy than PDF output produced from XML-based

#   files, visually I mean.

#

# To make the whole process transparent, a temporal directory is

# created for intermediate works and final files are moved then to

# their final location.

#

# Copyright (C) 2009, 2010, 2011 The CentOS Artwork SIG

#

# 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 2 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, write to the Free Software

# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

#

# ----------------------------------------------------------------------

# $Id$

# ----------------------------------------------------------------------

function docbook_convertToPdfFromSgml {

    # Print action message.

    if [[ -f ${FILE}.sgml.pdf ]];then

        cli_printMessage "${FILE}.sgml.pdf" --as-updating-line

    else

        cli_printMessage "${FILE}.sgml.pdf" --as-creating-line

    fi

    local -a STYLE_TEMPLATE

    local -a STYLE_INSTANCE

    local STYLE_INSTANCE_FINAL=''

    # Define name of temporal directory where the DocBook to PDF

    # transformation will take place.

    local TMPDIR=$(cli_getTemporalFile "docbook2pdf")

    # Define absolute path to DocBook source file. This is the

    # repository documentation manual file where DOCTYPE and ENTITY

    # definition lines are set.

    local SRC=${INSTANCE}

    # Define absolute path to PDF target file. This is the final

    # location the PDF file produced as result of DocBook to PDF

    # transformation will be stored in.

    local DST="${FILE}.sgml.pdf"

    # Define file name of PDF file.  This is the file we were looking

    # for and the one moved, once produced.

    local PDF=$(basename ${SRC} | sed -r 's!\.docbook$!.pdf!')

    # Replace document definition from XML to SGML.

    sed -i -r \

        -e 's!"-//OASIS//DTD DocBook XML!"-//OASIS//DTD DocBook!' \

        -e 's!"http://www\.oasis-open\.org/docbook/xml/([[:digit:]])\.([[:digit:]])/docbookx\.dtd"!"docbook/sgml-dtd-\1.\2-1.0-30.1/docbook.dtd"!' \

        $SRC

    # Prepare style final instance used in transformations.

    ${RENDER_BACKEND}_prepareStyles "${DOCBOOK_STYLES_DIR}/docbook2pdf.dsl"

    # Verify temporal directory and create it if doesn't exist.

    if [[ ! -d $TMPDIR ]];then

        mkdir $TMPDIR

    fi

    # Move inside temporal directory.

    pushd $TMPDIR > /dev/null

    # Create PDF format.

    docbook2pdf --dsl ${STYLE_INSTANCE_FINAL} ${SRC} &> /dev/null

    # Verify `docbook2pdf' exit status and, if everything is ok, move

    # PDF file from temporal directory to its target location.

    if [[ $? -eq 0 ]];then

        mv $PDF $DST

    else 

        cli_printMessage "`gettext "Cannot produce the PDF file."`" --as-error-line

    fi

    # Return to where we initially were.

    popd > /dev/null

    # Remove temporal directory and temporal style instances created.

    rm -r $TMPDIR

    rm ${STYLE_INSTANCE[*]}

}