#!/bin/bash

#

# docbook_convertToPdfFromXml.sh -- This function transforms DocBook

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

# DocBook XML DTD, we need an XSLT engine (e.g., through `xsltproc'

# command) to produce formatting objects (FO), which then must be

# processed with an FO engine (e.g., through `pdfxmltex' command,

# which uses PassiveTex) to produce the PDF output.

#

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

# presented the following problems:

#

# 1. Something is wrong with headings. They are not expanded along

# the whole page-body. They seem to be rendered in a reduced width

# (1 inch approximatly). This provokes the heading to be broken in a

# two-to-five letters column and sometimes it overlaps the

# sectioning titles (e.g., chatper, section). I tried to customize

# the value of `header.column.widths' and `page.margin.top' but it

# seems to be not there where I need to touch.

#

# 2. TOC's indentation is not rendered. Even the `toc.indent.width'

# property is set to 24 by default.

#

# 3. Inside lists, when items are more than one line, the

# indentation seems to work for the first line only.  All other

# lines in the same item are not indented and begin completly

# unaligned.

#

# 4. Long file paths near the end of page-body aren't hyphenated.

# Even the `hyphenate' property is set to `true' by default.

#

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

# presented the following advantages:

#

# 1. It is possible to produce localized PDF outputs through

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

# the `centos-art.sh' script.

#

# 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 Project

#

# 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_convertToPdfFromXml {

    # Print action message.

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

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

    else

        cli_printMessage "${FILE}.xml.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}.xml.pdf"

    # Define file name of formatting object (.fo) file. This file is

    # an intermediate file needed to produced the PDF.

    local FO=$(basename ${FILE}).fo

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

    # for and the one moved, once produced.

    local PDF=$(basename ${FILE}).pdf

    # Prepare XSL final instances used in transformations.

    ${RENDER_BACKEND}_prepareStyles "${DOCBOOK_STYLES_DIR}/docbook2fo.xsl"

    # 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 formatting object supressing output from stderr.

    xsltproc --output ${FO} ${STYLE_INSTANCE_FINAL} ${SRC} &> /dev/null

    # Create PDF format from formatting object. The `pdfxmltex'

    # command (which use the `PassiveTex' engine) must be executed

    # twice in order for the document's cross references to be built

    # correctly.

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

        pdfxmltex ${FO} > /dev/null

        pdfxmltex ${FO} > /dev/null

    else 

        cli_printMessage "`gettext "Cannot produce the formatting object."`" --as-error-line

    fi

    # Verify `pdfxmltex' 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[*]}

}