feat: prima versione del plugin, blocco e shortcode con iframe stampato lato server

includes/shortcode.php

@@ -0,0 +1,28 @@
+<?php
+/**
+ * The [piazza-in-festa] shortcode.
+ *
+ * Attribute names are Italian because the data is Italian: they match the town
+ * identifiers and the parameters documented on piazzainfesta.it, so what you
+ * read there is what you write here.
+ *
+ *   [piazza-in-festa comuni="alba,barolo,la-morra" limite="5"]
+ *   [piazza-in-festa regione="Piemonte" categoria="sagra_enogastronomica"]
+ *
+ * @package PiazzaInFesta
+ */
+
+defined( 'ABSPATH' ) || exit;
+
+/**
+ * Renders the shortcode.
+ *
+ * @param array|string $atts Shortcode attributes.
+ * @return string HTML.
+ */
+function pinfesta_shortcode( $atts ) {
+	$args = shortcode_atts( pinfesta_defaults(), $atts, 'piazza-in-festa' );
+
+	return pinfesta_render_iframe( $args );
+}
+add_shortcode( 'piazza-in-festa', 'pinfesta_shortcode' );