#!/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

# approximately). This provokes the heading to be broken in a

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

# titles (e.g., chapter, 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 completely 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) 2009-2013 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.

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

    local -a STYLE_TEMPLATE

    local -a STYLE_INSTANCE

    local STYLE_INSTANCE_FINAL=''

    # 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}.pdf"

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

    # an intermediate file needed to produced the PDF.

    local FO=$(echo ${INSTANCE} | sed -r 's/docbook$/fo/g')

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

    # for and the one moved, once produced.

    local PDF=$(echo ${INSTANCE} | sed -r 's/docbook$/pdf/g')

    # Prepare XSL final instances used in transformations.

    docbook_prepareStyles "${DOCBOOK_XSL}/docbook2fo.xsl"

    # Create link to `Images' directory. This is the directory where

    # images used by documentation are stored in. Be sure to remove

    # previous links first to prevent a recursive creation of links.

    ln -sf ${TCAR_WORKDIR}/Identity/Images/Webenv $(dirname ${INSTANCE})/Images

    # Create formatting object suppressing output from stderr.

    xsltproc --output ${FO} ${STYLE_INSTANCE_FINAL} ${SRC} 2> /dev/null

    # Create PDF format from formatting object. Because we are using

    # relative path to access `Images', it is necessary to move the

    # directory stack into the temporal directory where instance files

    # are created. Otherwise, the location used to load images will

    # fail.

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

        pushd $(dirname ${INSTANCE}) > /dev/null

        xmlto -o $(dirname ${FILE}) pdf ${FO}

        popd > /dev/null

    else 

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

    fi

}