#!/bin/bash

#

# cli_getConfigLines.sh -- This function standardizes 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.

#

# Copyright (C) 2009, 2010, 2011, 2012 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 cli_getConfigLines {

    # Initialize absolute path to configuration file.

    local CONFIG_ABSPATH="$1"

    # Verify that configuration file does exist.

    cli_checkFiles -e ${CONFIG_ABSPATH}

    # Initialize configuration section name where the variable value

    # we want to to retrieve is set in.

    local CONFIG_SECTION="$2"

    # Be sure the configuration section name has the correct format.

    if [[ ! $CONFIG_SECTION =~ '^[[:alpha:]]+$' ]];then

        cli_printMessage "`gettext "The configuration section provided is incorrect."`" --as-error-line

    fi

    # Initialize variable name we want to retrieve value from.

    local CONFIG_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 [[ ! $CONFIG_OPTION =~ '^[[:alnum:]_./-]+$' ]];then

        CONFIG_OPTION='[[:alnum:]_./-]+='

    fi

    # Retrieve configuration lines from configuration file.

    local CONFIG_LINES=$(cat ${CONFIG_ABSPATH} \

        | egrep -v '^#' \

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

        | sed -r 's![[:space:]]*!!g' \

        | sed -r -n "/^\[${CONFIG_SECTION}\]$/,/^\[/p" \

        | egrep -v '^\[' | sort | uniq \

        | egrep "^${CONFIG_OPTION}")

    # Output value related to variable name.

    echo "$CONFIG_LINES"

}