#!/bin/bash

######################################################################

#

#   tcar - The CentOS Artwork Repository automation tool.

#   Copyright © 2014 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.

#

#   Alain Reguera Delgado <al@centos.org.cu>

#   39 Street No. 4426 Cienfuegos, Cuba.

#

######################################################################

# Standardize the way configuration lines are retrieved form

# configuration files. As arguments, the configuration file absolute

# path, the configuration section name, and the configuration option

# name must be provided.

function tcar_getConfigLines {

    # Initialize absolute path to configuration file.

    local CONFIGURATION_FILE="${1}"

    # Initialize configuration section name where the variable value

    # we want to to retrieve is set in.

    local CONFIGURATION_SECTION="${2}"

    # Initialize variable name we want to retrieve value from.

    local CONFIGURATION_OPTION="${3}"

    # Verify configuration variable name. When no variable name is

    # provided print all configuration lines that can be considered as

    # well-formed paths. Be sure configuration variable name starts

    # just at the beginning of the line.

    if [[ ! ${CONFIGURATION_OPTION} =~ '^[[:alnum:]_./-]+$' ]];then

        CONFIGURATION_OPTION='[[:alnum:]_./-]+[[:space:]]*='

    fi

    # Retrieve configuration lines from configuration file. Don't sort

    # the value of this value so as to preserve the order given in the

    # configuration file. This is important because configuration

    # files are being used for setting render-from priorities.

    local CONFIGURATION_LINES=$(cat ${CONFIGURATION_FILE} \

        | egrep -v '^#' \

        | egrep -v '^[[:space:]]*$' \

        | sed -r -n "/^\[${CONFIGURATION_SECTION}\][[:space:]]*$/,/^\[/p" \

        | egrep -v '^\[' \

        | egrep "^${CONFIGURATION_OPTION}")

    # Output value related to variable name.

    echo "${CONFIGURATION_LINES}"

}