C:/xampp/htdocs/moodle/theme/arialist/lib.php

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<?php

function arialist_process_css($css, $theme) {

    // Set the link color
    if (!empty($theme->settings->linkcolor)) {
        $linkcolor = $theme->settings->linkcolor;
    } else {
        $linkcolor = null;
    }
    $css = arialist_set_linkcolor($css, $linkcolor);

    // Set the region width
    if (!empty($theme->settings->regionwidth)) {
        $regionwidth = $theme->settings->regionwidth;
    } else {
        $regionwidth = null;
    }
    $css = arialist_set_regionwidth($css, $regionwidth);

    // Set the custom CSS
    if (!empty($theme->settings->customcss)) {
        $customcss = $theme->settings->customcss;
    } else {
        $customcss = null;
    }
    $css = arialist_set_customcss($css, $customcss);

    // Return the CSS
    return $css;
}

function arialist_set_linkcolor($css, $linkcolor) {
    $tag = '[[setting:linkcolor]]';
    $replacement = $linkcolor;
    if (is_null($replacement)) {
        $replacement = '#f25f0f';
    }
    $css = str_replace($tag, $replacement, $css);
    return $css;
}

function arialist_set_regionwidth($css, $regionwidth) {
    $tag = '[[setting:regionwidth]]';
    $doubletag = '[[setting:regionwidthdouble]]';
    $replacement = $regionwidth;
    if (is_null($replacement)) {
        $replacement = 250;
    }
    $css = str_replace($tag, $replacement.'px', $css);
    $css = str_replace($doubletag, ($replacement*2).'px', $css);
    return $css;
}

function arialist_set_customcss($css, $customcss) {
    $tag = '[[setting:customcss]]';
    $replacement = $customcss;
    if (is_null($replacement)) {
        $replacement = '';
    }
    $css = str_replace($tag, $replacement, $css);
    return $css;
}