colorscheme.php

<?php

/**
 * Plugin Colorscheme
 *
 * Displays a color in #xxyyzz format as an inline sample block.
 */

use Shaarli\Plugin\PluginManager;
use Shaarli\Render\TemplatePage;

/* HSP Color Model - http://alienryderflex.com/hsp.html */
function dark_color($match)
{
    $brightness = sqrt(.299 * pow(hexdec($match[1]), 2)
        + .587 * pow(hexdec($match[2]), 2)
        + .114 * pow(hexdec($match[3]), 2));
    return ($brightness <= 127.5);
}

function display_color($match)
{
    $hex_color = '#' . strtolower($match[1]) . strtolower($match[2]) . strtolower($match[3]);

    $dark = dark_color($match) ? ' dark' : '';

    return '<a class="colorscheme' . $dark
        . '" style="background-color: ' .  $hex_color
        . '" href="#">' . $hex_color .  '</a>';
}

function colorscheme_url($url)
{
    $pattern = '/^https:\/\/assets.adobe.com\//i';
    return preg_match($pattern, $url) ? 1 : 0;
}

function hook_colorscheme_render_editlink($data)
{
    if ($data['link_is_new'] && colorscheme_url($data['link']['url'])) {
        $data['link']['tags'] = 'colorscheme';
    }

    return $data;
}

function hook_colorscheme_render_linklist($data)
{
    #$pattern = '/<a href="[^"]+">(#[a-f0-9]{6})</a>/i';
    $pattern = '/<a href="[^"]+">#([a-f0-9]{2})([a-f0-9]{2})([a-f0-9]{2})<\/a>(?:\r\n|\n)?(?:<br\s*\/?>)?/msi';
    foreach ($data['links'] as &$value) {
        $value['description'] = preg_replace_callback(
            $pattern,
            "display_color",
            $value['description'],
            -1,
            $count
        );
    }

    return $data;
}

function hook_colorscheme_render_includes($data)
{
    if ($data['_PAGE_'] == TemplatePage::LINKLIST) {
        $data['css_files'][] = PluginManager::$PLUGINS_PATH . '/colorscheme/colorscheme.css';
    }

    return $data;
}

function hook_colorscheme_render_footer($data)
{
    $data['js_files'][] = PluginManager::$PLUGINS_PATH . '/colorscheme/colorscheme.js';

    return $data;
}

/**
 * This function is never called, but contains translation calls for GNU gettext extraction.
 */
function colorscheme_dummy_translation()
{
    // meta
    t('Displays a color in #xxyyzz format as an inline sample block.');
}