- Implements shortcodes

- Updates newsletter router/sending queue worker to use shortcodes
  replacement class

lib/Newsletter/Shortcodes/Categories/Date.php

@@ -0,0 +1,43 @@
+<?php
+namespace MailPoet\Newsletter\Shortcodes\Categories;
+
+class Date {
+  /*
+    {
+      text: '<%= __('Current day of the month number') %>',
+      shortcode: 'date:d',
+    },
+    {
+      text: '<%= __('Current day of the month in ordinal, ie. 2nd, 3rd, etc.') %>',
+      shortcode: 'date:dordinal',
+    },
+    {
+      text: '<%= __('Full name of current day') %>',
+      shortcode: 'date:dtext',
+    },
+    {
+      text: '<%= __('Current month number') %>',
+      shortcode: 'date:m',
+    },
+    {
+      text: '<%= __('Full name of current month') %>',
+      shortcode: 'date:mtext',
+    },
+    {
+      text: '<%= __('Year') %>',
+      shortcode: 'date:y',
+    }
+   */
+  static function process($action) {
+    $date = new \DateTime('now');
+    $actions = array(
+      'd' => $date->format('d'),
+      'dordinal' => $date->format('dS'),
+      'dtext' => $date->format('D'),
+      'm' => $date->format('m'),
+      'mtext' => $date->format('F'),
+      'y' => $date->format('Y')
+    );
+    return (isset($actions[$action])) ? $actions[$action] : false;
+  }
+}

lib/Newsletter/Shortcodes/Categories/Link.php

@@ -0,0 +1,30 @@
+<?php
+namespace MailPoet\Newsletter\Shortcodes\Categories;
+
+require_once(ABSPATH . 'wp-includes/pluggable.php');
+
+class Link {
+  /*
+    {
+      text: '<%= __('Unsubscribe link') %>',
+      shortcode: 'global:unsubscribe',
+    },
+    {
+      text: '<%= __('Edit subscription page link') %>',
+      shortcode: 'global:manage',
+    },
+    {
+      text: '<%= __('View in browser link') %>',
+      shortcode: 'global:browser',
+    }
+   */
+  static function process($action) {
+    // TODO: implement
+    $actions = array(
+      'unsubscribe' => '',
+      'manage' => '',
+      'browser' => ''
+    );
+    return (isset($actions[$action])) ? $actions[$action] : false;
+  }
+}

lib/Newsletter/Shortcodes/Categories/Newsletter.php

@@ -0,0 +1,43 @@
+<?php
+namespace MailPoet\Newsletter\Shortcodes\Categories;
+
+class Newsletter {
+  /*
+    {
+      text: '<%= __('Newsletter Subject') %>',-
+      shortcode: 'newsletter:subject',
+    },
+    {
+      text: '<%= __('Total number of posts or pages') %>',
+      shortcode: 'newsletter:total',
+    },
+    {
+      text: '<%= __('Latest post title') %>',
+      shortcode: 'newsletter:post_title',
+    },
+    {
+      text: '<%= __('Issue number') %>',
+      shortcode: 'newsletter:number',
+    }
+   */
+  static function process($action, $default_value = false, $newsletter) {
+    if(is_object($newsletter)) {
+      $newsletter = $newsletter->asArray();
+    }
+    switch($action) {
+      case 'subject':
+        return ($newsletter) ? $newsletter['subject'] : false;
+      case 'total':
+        $posts = wp_count_posts();
+        return $posts->publish;
+      case 'post_title':
+        $post = wp_get_recent_posts(array('numberposts' => 1));
+        return (isset($post[0])) ? $post[0]['post_title'] : false;
+      case 'number':
+        // TODO: implement
+        return;
+      default:
+        return false;
+    }
+  }
+}

lib/Newsletter/Shortcodes/Categories/User.php

@@ -0,0 +1,54 @@
+<?php
+namespace MailPoet\Newsletter\Shortcodes\Categories;
+
+use MailPoet\Models\Subscriber;
+
+require_once(ABSPATH . 'wp-includes/pluggable.php');
+
+class User {
+  /*
+    {
+      text: '<%= __('First Name') %>',
+      shortcode: 'user:firstname | default:reader',
+    },
+    {
+      text: '<%= __('Last Name') %>',
+      shortcode: 'user:lastname | default:reader',
+    },
+    {
+      text: '<%= __('Email Address') %>',
+      shortcode: 'user:email',
+    },
+    {
+      text: '<%= __('Wordpress user display name') %>',
+      shortcode: 'user:displayname | default:member',
+    },
+    {
+      text: '<%= __('Total of subscribers') %>',
+      shortcode: 'user:count',
+    }
+   */
+  static function process($action, $default_value, $newsletter = false, $subscriber) {
+    if(is_object($subscriber)) {
+      $subscriber = $subscriber->asArray();
+    }
+    switch($action) {
+      case 'firstname':
+        return ($subscriber) ? $subscriber['first_name'] : $default_value;
+      case 'lastname':
+        return ($subscriber) ? $subscriber['last_name'] : $default_value;
+      case 'email':
+        return ($subscriber) ? $subscriber['email'] : false;
+      case 'displayname':
+        if($subscriber && $subscriber['wp_user_id']) {
+          $wp_user = get_userdata($subscriber['wp_user_id']);
+          return $wp_user->user_login;
+        };
+        return $default_value;
+      case 'count':
+        return Subscriber::count();
+      default:
+        return false;
+    }
+  }
+}

lib/Newsletter/Shortcodes/Shortcodes.php

@@ -0,0 +1,53 @@
+<?php
+namespace MailPoet\Newsletter\Shortcodes;
+
+class Shortcodes {
+  public $rendered_newsletter;
+  public $newsletter;
+  public $subscriber;
+
+  function __construct(
+    $rendered_newsletter,
+    $newsletter = false,
+    $subscriber = false) {
+    $this->rendered_newsletter = $rendered_newsletter;
+    $this->newsletter = $newsletter;
+    $this->subscriber = $subscriber;
+  }
+
+  function extract() {
+    preg_match_all('/\[(?:\w+):.*?\]/', $this->rendered_newsletter, $shortcodes);
+    return array_unique($shortcodes[0]);
+  }
+
+  function process($shortcodes) {
+    $processed_shortcodes = array_map(
+      function ($shortcode) {
+        // TODO: discuss renaming "global". It is a reserved name in PHP.
+        if($shortcode === 'global') $shortcode = 'link';
+        preg_match(
+          '/\[(?P<type>\w+):(?P<action>\w+)(?:.*?default:(?P<default>.*?))?\]/',
+          $shortcode,
+          $shortcode_details
+        );
+        $shortcode_class =
+          __NAMESPACE__ . '\\Categories\\' . ucfirst($shortcode_details['type']);
+        if(!class_exists($shortcode_class)) return false;
+        return $shortcode_class::process(
+          $shortcode_details['action'],
+          isset($shortcode_details['default'])
+            ? $shortcode_details['default'] : false,
+          $this->newsletter,
+          $this->subscriber
+        );
+      }, $shortcodes);
+    return array_filter($processed_shortcodes);
+  }
+
+  function replace() {
+    $shortcodes = $this->extract($this->rendered_newsletter);
+    $processed_shortcodes = $this->process($shortcodes);
+    $shortcodes = array_intersect_key($shortcodes, $processed_shortcodes);
+    return str_replace($shortcodes, $processed_shortcodes, $this->rendered_newsletter);
+  }
+}