#!/usr/bin/perl

# xshowrgb --- show the RGB colors ... visually
#
# author:  Ryurick M. Hristev <r.hristev@phys.canterbury.ac.nz>
# license: Public Domain

#____________________________________________________________________
# User Options

$font = '-adobe-courier-bold-r-*-*-*-160-*-*-*-*-*-*';

#____________________________________________________________________
# Prereq

use Tk;
use Tk::ROText;

#____________________________________________________________________
# RGB Color Database

# grab the color DB
open(SHOWRGB, "showrgb |");

# convert to hex, build the hash
while (<SHOWRGB>){
	$_ =~ m/(\d{1,3})\s+(\d{1,3})\s+(\d{1,3})\s+([A-Za-z0-9 ]*)/;

	my $rgb = sprintf("%02x", $1) . sprintf("%02x", $2) . sprintf("%02x", $3);

	if ( $db{"$rgb"} ){
		$db{"$rgb"} .= ", $4"
	} else {
		$db{"$rgb"} = $4
	}
}

#____________________________________________________________________
# GUI

$main = MainWindow -> new(-title => 'xcolorsel');

$menu = $main -> Frame(-relief      => 'raised',
                       -borderwidth => 2)
              -> pack(-side => 'top',
                      -fill => 'x');

$menu_quit = $menu -> Button(-text    => 'Quit',
                             -font    => $font,
                             -relief  => 'flat',
                             -command => \&exit)
                   -> pack(-side => 'left');

$text = $main -> Scrolled(ROText,
                          -font       => $font,
                          -scrollbars => 'e',
                          -wrap       => 'none',
                          -relief     => 'flat')
              -> pack(-side   => 'bottom',
                      -fill   => 'both',
                      -expand => 'true');

# create tags and display
foreach my $key (sort keys %db){
	$color = '#' . $key;

	# force conversion to number ...
	$a = hex($key);
	# ... and complement of 0xffffff
	$complement = $a ^ 16777215;

	$c_color = sprintf("%06x", $complement);

	# tag for background
	$text -> tag('bind', "tag_bg_$key");
	$text -> tag('configure', "tag_bg_$key",
                     -background => $color);

	# tag for foregrownd, white backgrownd
	$text -> tag('bind', "tag_fgw_$key");
	$text -> tag('configure', "tag_fgw_$key",
                     -foreground => $color,
                     -background => white);

	# tag for foregrownd, black backgrownd
	$text -> tag('bind', "tag_fgb_$key");
	$text -> tag('configure', "tag_fgb_$key",
                     -foreground => $color,
                     -background => black);

	# tag for backgrownd, white foreground
	$text -> tag('bind', "tag_bgw_$key");
	$text -> tag('configure', "tag_bgw_$key",
                     -background => $color,
                     -foreground => white);

	# tag for backgrownd, black foreground
	$text -> tag('bind', "tag_bgb_$key");
	$text -> tag('configure', "tag_bgb_$key",
                     -background => $color,
                     -foreground => black);

	# complement colors
	$text -> tag('bind', "tag_cmpl_$key");
	$text -> tag('configure', "tag_cmpl_$key",
                     -foreground => $color,
                     -background => "#$c_color");

	# contents
        # --- column 1: color
	$text -> insert('end', '       ', "tag_bg_$key");
	$text -> insert('end', "\t");
        # --- column 2: color code on white
	$text -> insert('end', "$key", "tag_fgw_$key");
	$text -> insert('end', "\t");
        # --- column 3: color code on black
	$text -> insert('end', "$key", "tag_fgb_$key");
	$text -> insert('end', "\t");
        # --- column 4: white on color
	$text -> insert('end', "$key", "tag_bgw_$key");
	$text -> insert('end', "\t");
        # --- column 5: black on color
	$text -> insert('end', "$key", "tag_bgb_$key");
	$text -> insert('end', "\t");
        # --- column 6: color on complement
	$text -> insert('end', "$c_color", "tag_cmpl_$key");
	$text -> insert('end', "\t");
	$text -> insert('end', "$db{$key}");
	# --- show complement name if exists
	if ($db{$c_color}){
		$text -> insert('end', " --- $db{$c_color}")
	}
	$text -> insert('end', "\n");
}

$text -> configure(-state => 'disabled');

MainLoop;