#!/bin/bash

#

# prepare_doPackages.sh -- This function verifies the required

# packages your workstation needs to have installed in order for

# centos-art command to run correctly. If there is one or more missing

# packages, the `centos-art.sh' script asks you to confirm their

# installation through yum.

#

# Copyright (C) 2009-2011 Alain Reguera Delgado

#

# 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 prepare_doPackages {

    # Verify `--packages' option.

    if [[ $FLAG_PACKAGES == 'false' ]];then

        return

    fi

    # Print line separator.

    cli_printMessage '-' 'AsSeparatorLine'

    # Print action message.

    cli_printMessage "`gettext "Checking required packages"`" 'AsResponseLine'

    # Print line separator.

    cli_printMessage '-' 'AsSeparatorLine'

    local PACKAGE=''

    local WARNING=''

    local PACKAGES=''

    local PACKAGES_THIRDS=''

    local -a PACKAGES_MISSING

    local RPM='/bin/rpm'

    local YUM='/usr/bin/yum'

    # Check execution rights of package managers.

    cli_checkFiles $RPM 'x'

    cli_checkFiles $YUM 'x'

    # Define required packages needed by centos-art.sh script.

    PACKAGES="inkscape ImageMagick netpbm netpbm-progs syslinux gimp

        coreutils texinfo info tetex-latex tetex-fonts tetex-xdvi

        tetex-dvips gettext texi2html gnome-doc-utils elinks

        docbook-style-xsl docbook-utils docbook-dtds

        docbook-style-dsssl docbook-simple docbook-utils-pdf

        docbook-slides firefox sudo yum rpm"

    # Define packages from third party repositories (i.e., packages

    # not included in CentOS [base] repository.) required by

    # centos-art to work as expected.

    PACKAGES_THIRDS="(inkscape|blender)"

    # Build list of missing packages.

    for PACKAGE in $PACKAGES;do

        $RPM -q --queryformat "%{NAME}\n" $PACKAGE --quiet

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

            PACKAGES_MISSING[((++${#PACKAGES_MISSING[*]}))]=$PACKAGE

        fi

    done

    # Is there any package missing?

    if [[ ${#PACKAGES_MISSING[*]} -eq 0 ]];then

        cli_printMessage "`gettext "The required packages has been already installed."`"

        return

    fi

    # At this point there is one or more missing packages that need to

    # be installed in the workstation. Report this issue and specify

    # which these packages are.

    cli_printMessage "`ngettext "The following package needs to be installed" \

        "The following packages need to be installed" \

        "${#PACKAGES_MISSING[*]}"`:"

    # Build report of missing packages and remark those comming from

    # third party repository.

    for PACKAGE in ${PACKAGES_MISSING[@]};do

        if [[ $PACKAGE =~ $PACKAGES_THIRDS ]];then

            WARNING=" (`gettext "requires third party repository!"`)"

        fi

        cli_printMessage "${PACKAGE}${WARNING}" 'AsResponseLine'

    done

    # Print confirmation request.

    cli_printMessage "`gettext "Do you want to continue"`" 'AsYesOrNoRequestLine'

    # Use sudo to install the missing packages in your system through

    # yum.

    sudo ${YUM} install ${PACKAGES_MISSING[*]}

}