#!/bin/bash
#
# render_getConfigOption.sh -- This function standardizes the way
# action values are retrived from pre-rendition configuration files.
# Use this function whenever you need to retrive action values from
# pre-rendition configuration script.
#
# Usage: VAR=$(render_getConfigOption "ACTION" "FIELD")
#
# VAR is the name of the variable where we store the option named
# returned by render_getConfigOption. 
#
# ACTION is the string definition set in the pre-rendition
# configuration script that holds the action name and its options
# fields.
#
# FIELD is the field number in the action string we want to retrive
# option from. By default options start from third field on. The first
# field is reserved for the action type (i.e., POST or LAST), and the
# second field is reserved for the action itself (e.g., convertPngTo,
# renderSyslinux, renderKsplash, etc.).
#
# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
# USA.
# ----------------------------------------------------------------------
# $Id$
# ----------------------------------------------------------------------

function render_getConfigOption {

    local ACTION="$1"
    local FIELD="$2"
    local VALUE=''

    # Check action value. The action's value must be present in order
    # for this function to work. It provides the string needed to
    # retrive options from.
    if [[ "$ACTION" == '' ]];then
        cli_printMessage "`gettext "There is no action to work with."`"
        cli_printMessage "${FUNCDIRNAM}" 'AsToKnowMoreLine'
    fi

    # Check field value. The field's value must match the cut's
    # command specification of its -f option.
    if [[ ! "$FIELD" =~ '^([0-9]+|[0-9]+-|-[0-9]+|[0-9]+-[0-9]+)$' ]];then
        cli_printMessage "`gettext "The field specified is not valid."`"
        cli_printMessage "${FUNCDIRNAM}" 'AsToKnowMoreLine'
    fi

    # Get option from pre-rendition configuration action definition.
    VALUE=$(echo -n "$ACTION" | cut -d: -f${FIELD})

    # Sanitate action value passed from pre-rendition configuration
    # action definition.
    VALUE=$(echo -n "${VALUE}" \
        | sed -r 's!^ *!!g' \
        | sed -r 's!( |,|;) *! !g' \
        | sed -r 's! *$!!g')

    # Output action value without trailing newline.
    echo -n "$VALUE"

}