#!/bin/bash

#

# docbook_convertToPdf.sh -- This function produces PDF output for

# repository documentation manual, in DocBook XML format. The

# procedure was taken from `docbook-style-xsl-1.69.1-5.1'

# documentation, which says: ---To get to print, you need an XSLT

# engine (e.g., `xsltproc') to produce formatting objects (FO), which

# then must be processed with an FO engine (e.g., `pdfxmltex') to

# produce PostScript or PDF output---. To make the whole process

# transparent, a temporal directory is created for intermediate works.

# Once the PDF file is produced there, it is moved to its 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_convertToPdf {

    # Print action message.

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

    # 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}.pdf"

    # Define absolute path of the XSLT file used to create the

    # formatting object (.fo) file.

    local XSLT=/usr/share/sgml/docbook/xsl-stylesheets/fo/docbook.xsl

    # 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

    # 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 ${XSLT} ${SRC} 2> /dev/null > ${FO}

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

    # must be executed twice in order for 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 `' 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.

    rm -r $TMPDIR

}