plugins/default_colors/default_colors.php

   1 <?php
   2
   3 /**
   4  * Plugin default_colors.
   5  *
   6  * Allow users to easily overrides colors of the default theme.
   7  */
   8
   9 use Shaarli\Config\ConfigManager;
  10 use Shaarli\Plugin\PluginManager;
  11
  12 const DEFAULT_COLORS_PLACEHOLDERS = [
  13     'DEFAULT_COLORS_MAIN',
  14     'DEFAULT_COLORS_BACKGROUND',
  15     'DEFAULT_COLORS_DARK_MAIN',
  16 ];
  17
  18 const DEFAULT_COLORS_CSS_FILE = '/default_colors/default_colors.css';
  19
  20 /**
  21  * Display an error if the plugin is active a no color is configured.
  22  *
  23  * @param $conf ConfigManager instance
  24  *
  25  * @return array|null The errors array or null of there is none.
  26  */
  27 function default_colors_init($conf)
  28 {
  29     $params = [];
  30     foreach (DEFAULT_COLORS_PLACEHOLDERS as $placeholder) {
  31         $value = trim($conf->get('plugins.' . $placeholder, ''));
  32         if (strlen($value) > 0) {
  33             $params[$placeholder] = $value;
  34         }
  35     }
  36
  37     if (empty($params)) {
  38         $error = t('Default colors plugin error: ' .
  39             'This plugin is active and no custom color is configured.');
  40         return [$error];
  41     }
  42
  43     // Colors are defined but the custom CSS file does not exist -> generate it
  44     if (!file_exists(PluginManager::$PLUGINS_PATH . DEFAULT_COLORS_CSS_FILE)) {
  45         default_colors_generate_css_file($params);
  46     }
  47 }
  48
  49 /**
  50  * When linklist is displayed, include default_colors CSS file.
  51  *
  52  * @param array $data - header data.
  53  *
  54  * @return mixed - header data with default_colors CSS file added.
  55  */
  56 function hook_default_colors_render_includes($data)
  57 {
  58     $file = PluginManager::$PLUGINS_PATH . '/default_colors/default_colors.css';
  59     if (file_exists($file)) {
  60         $data['css_files'][] = $file ;
  61     }
  62
  63     return $data;
  64 }
  65
  66 /**
  67  * Regenerate the custom CSS file with provided settings.
  68  *
  69  * @param array $params Plugin configuration (CSS rules)
  70  */
  71 function default_colors_generate_css_file($params): void
  72 {
  73     $file = PluginManager::$PLUGINS_PATH . '/default_colors/default_colors.css';
  74     $template = file_get_contents(PluginManager::$PLUGINS_PATH . '/default_colors/default_colors.css.template');
  75     $content = '';
  76     foreach (DEFAULT_COLORS_PLACEHOLDERS as $rule) {
  77         $content .= !empty($params[$rule])
  78             ? default_colors_format_css_rule($params, $rule) . ';' . PHP_EOL
  79             : '';
  80     }
  81
  82     if (! empty($content)) {
  83         file_put_contents($file, sprintf($template, $content));
  84     }
  85 }
  86
  87 /**
  88  * Create a valid CSS rule from parameters settings and plugin parameter.
  89  *
  90  * @param array  $data      $_POST array
  91  * @param string $parameter Plugin parameter name
  92  *
  93  * @return string CSS rules for the provided parameter and its matching value.
  94  */
  95 function default_colors_format_css_rule($data, $parameter)
  96 {
  97     if (empty($data[$parameter])) {
  98         return '';
  99     }
 100
 101     $key = str_replace('DEFAULT_COLORS_', '', $parameter);
 102     $key = str_replace('_', '-', strtolower($key)) . '-color';
 103     return '  --' . $key . ': ' . $data[$parameter];
 104 }
 105
 106
 107 /**
 108  * This function is never called, but contains translation calls for GNU gettext extraction.
 109  */
 110 function default_colors_translation()
 111 {
 112     // meta
 113     t('Override default theme colors. Use any CSS valid color.');
 114     t('Main color (navbar green)');
 115     t('Background color (light grey)');
 116     t('Dark main color (e.g. visited links)');
 117 }