#!/bin/bash

#

# svg_getColors.sh -- This function takes one palette produced by Gimp

# (e.g., syslinux.gpl) as input and outputs a list of colors in the

# specified format. In order for this function to output the color in

# the format specified, it is needed that the fourth column in the gpl

# palette be set in the `rrggbb' format and the appropriate conversion

# be implemented here.

#

# Notice that using both the `--head' and `--tail' options it is

# possible to control how many consecutive items does the list of

# colors is going to have.  It is possible to output all colors in the

# list, or a consecutive range of them.

#

# Copyright (C) 2009-2013 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 svg_getColors {

    # Define short options.

    local ARGSS=''

    # Define long options.

    local ARGSL='head:,tail:,format:'

    # Initialize both head and tail values to return the first line of

    # color information from the palette.

    local HEAD=1

    local TAIL=1

    # Initialize format value used as default when no format option be

    # provided.

    local FORMAT='rrggbb'

    # Initialize list of colors.

    local COLORS=''

    # Initialize arguments with an empty value and set it as local

    # variable to this function scope. Doing this is very important to

    # avoid any clash with higher execution environments.

    local ARGUMENTS=''

    # Prepare ARGUMENTS variable for getopt.

    cli_parseArgumentsReDef "$@"

    # Redefine ARGUMENTS using getopt(1) command parser.

    cli_parseArguments

    # Redefine positional parameters using ARGUMENTS variable.

    eval set -- "$ARGUMENTS"

    # Look for options passed through positional parameters.

    while true;do

        case "$1" in 

            --head )

                HEAD=$2

                shift 2

                ;;

            --tail )

                TAIL=$2

                shift 2

                ;;

            --format )

                FORMAT=$2

                shift 2

                ;;

            -- )

                shift 1

                break

                ;;

        esac

    done

    # Define path to gpl palette. This is the first file we use to

    # retrieve color information from. Only the first file provided

    # will be used.

    local PALETTE=$(echo $@ | cut -d' ' -f1)

    if [[ ! -f $PALETTE ]];then

        # Define palette path inside the theme's artistic motif.

        local MOTIF_PALETTE=${TCAR_WORKDIR}/Identity/Images/Themes/$(cli_getPathComponent $ACTIONVAL --motif)/Palettes/grub.gpl

        # Define palette path inside the theme's design model.

        local MODEL_PALETTE=${TCAR_WORKDIR}/Identity/Models/Themes/${THEME_MODEL_NAME}/Palettes/grub.gpl

        # Redefine default background color using palettes provided by

        # artistic motif first, and design model later. Assuming none

        # of them is present, use The CentOS Project default color

        # then.

        if [[ -f $MOTIF_PALETTE ]];then

            COLORS=$(svg_getColors $MOTIF_PALETTE --head=1 --tail=1)

        elif [[ -f $MODEL_PALETTE ]];then

            COLORS=$(svg_getColors $MODEL_PALETTE --head=1 --tail=1)

        else

            COLORS='#204c8d'

        fi

    else

        # Retrieve the fourth column from GPL palette. The fourth

        # column of a GPL palette contains the palette commentary

        # field. The palette commentary field can be anything, but for

        # the sake of our own convenience we use it to store the color

        # value in hexadecimal format (e.g., rrggbb).  Notice that you

        # can put your comments from the fifth column on using an

        # space as field separator.

        COLORS=$(sed -r '1,/^#/d' $PALETTE \

            | awk '{ printf "%s\n", $4 }' | head -n $HEAD | tail -n $TAIL)

    fi

    # Implement color formats conversions from rrggbb to other formats

    # that you might need to use.

    for COLOR in $COLORS;do

        case $FORMAT in

            rrggbb|* )

                if [[ ! $COLOR =~ '^#' ]];then

                    COLOR="#${COLOR}"

                fi

                ;;

        esac

        # Output color value.

        echo "$COLOR"

    done

}