+<?php
+
+/**
+ * Plugin default_colors.
+ *
+ * Allow users to easily overrides colors of the default theme.
+ */
+
+use Shaarli\Plugin\PluginManager;
+
+const DEFAULT_COLORS_PLACEHOLDERS = [
+ 'DEFAULT_COLORS_MAIN',
+ 'DEFAULT_COLORS_BACKGROUND',
+ 'DEFAULT_COLORS_DARK_MAIN',
+];
+
+/**
+ * When plugin parameters are saved
+ */
+function hook_default_colors_save_plugin_parameters($data)
+{
+ $file = PluginManager::$PLUGINS_PATH . '/default_colors/default_colors.css';
+ $template = file_get_contents(PluginManager::$PLUGINS_PATH . '/default_colors/default_colors.css.template');
+ $content = '';
+ foreach (DEFAULT_COLORS_PLACEHOLDERS as $rule) {
+ $content .= ! empty($data[$rule])
+ ? default_colors_format_css_rule($data, $rule) .';'. PHP_EOL
+ : '';
+ }
+ file_put_contents($file, sprintf($template, $content));
+ return $data;
+}
+
+/**
+ * When linklist is displayed, include isso CSS file.
+ *
+ * @param array $data - header data.
+ *
+ * @return mixed - header data with isso CSS file added.
+ */
+function hook_default_colors_render_includes($data)
+{
+ $file = PluginManager::$PLUGINS_PATH . '/default_colors/default_colors.css';
+ if (file_exists($file )) {
+ $data['css_files'][] = $file ;
+ }
+
+ return $data;
+}
+
+/**
+ * This function is never called, but contains translation calls for GNU gettext extraction.
+ */
+function default_colors_translation()
+{
+ // meta
+ t('Override default theme colors. Use any CSS valid color.');
+ t('Main color (navbar green)');
+ t('Background color (light grey)');
+ t('Dark main color (e.g. visited links)');
+}
+
+function default_colors_format_css_rule($data, $parameter)
+{
+ $key = str_replace('DEFAULT_COLORS_', '', $parameter);
+ $key = str_replace('_', '-', strtolower($key)) .'-color';
+ return ' --'. $key .': '. $data[$parameter];
+}