Add support for multiple categories in categorypage

doc/FAQ.md

@@ -9,7 +9,6 @@
  * [How do I remove the bullets from the list?](#bullets)
  * [The plugin doesn't work on servers with PHP < 5](#php5)
  * [Plugin could not be activated because it triggered a fatal error](#fatal-error)
- * [If a post has many categories, categorypage=yes only detects one of them](#categorypage)
 
 ## <a name="no_link"></a>How can I remove the hyperlink of the title of the post?
 
@@ -124,9 +123,3 @@ protected accessors. Try updating your server or using an [older version](http:/
 
 Please check:
 http://wordpress.stackexchange.com/questions/9338/list-category-posts-plugin-upgrade-fails-fatal-error/9340#9340
-
-## <a name="categorypage"></a>If a post has many categories, categorypage=yes only detects one of them
-
-This is how it works in the current implementation, there are no shortcode parameters to change this behavior.
-We have already received feature requests to make `categorypage=yes` work with multiple categories and it should be
-implemented at some stage.

include/lcp-category.php

@@ -71,7 +71,9 @@ public function current_category(){
         $categories = get_the_category($post->ID);
       }
       if ( !empty($categories) ){
-        return $categories[0]->cat_ID;
+        return implode(',', array_map(function($cat) {
+          return $cat->cat_ID;
+        }, $categories));
       } else {
         return [0]; // workaround to display no posts
       }

tests/lcpcategory/test-currentCategory.php

@@ -3,8 +3,10 @@
 class Tests_LcpCategory_CurrentCategory extends WP_UnitTestCase {
 
   protected static $test_post;
+  protected static $test_post_2;
   protected static $test_page;
   protected static $test_cat;
+  protected static $test_cat_2;
 
   public static function wpSetUpBeforeClass($factory) {
     // Create some random categories
@@ -18,17 +20,28 @@ public static function wpSetUpBeforeClass($factory) {
       ));
     }
 
-    // Create test category, test post and test page (no categories for page)
+    // Create test categories, test posts and test page (no categories for page)
     self::$test_cat = $factory->term->create(array(
       'taxonomy' => 'category',
       'name' => 'Lcp test cat'
     ));
 
+    self::$test_cat_2 = $factory->term->create(array(
+      'taxonomy' => 'category',
+      'name' => 'Lcp test cat 2'
+    ));
+
     self::$test_post = $factory->post->create(array(
       'post_title' => 'Lcp test post',
       'post_category' => array(self::$test_cat)
     ));
 
+    // Post with 2 categories
+    self::$test_post_2 = $factory->post->create(array(
+      'post_title' => 'Lcp test post',
+      'post_category' => array(self::$test_cat, self::$test_cat_2)
+    ));
+
     self::$test_page = $factory->post->create(array(
       'post_title' => 'Lcp test page',
       'post_type' => 'page'
@@ -53,8 +66,15 @@ public function test_single_post_page() {
 
     $this->go_to('/?p=' . self::$test_post);
     $this->assertQueryTrue('is_singular', 'is_single');
-    $this->assertSame(self::$test_cat, $lcpcategory->current_category());
+    $this->assertSame((string) self::$test_cat, $lcpcategory->current_category());
     $this->assertSame('Lcp test cat', get_category($lcpcategory->current_category())->cat_name);
+
+    // More than one category
+    $cat_ID_1 = self::$test_cat;
+    $cat_ID_2 = self::$test_cat_2;
+    $this->go_to('/?p=' . self::$test_post_2);
+    $this->assertQueryTrue('is_singular', 'is_single');
+    $this->assertSame("${cat_ID_1},${cat_ID_2}", $lcpcategory->current_category());
   }
 
   public function test_single_page_with_no_categories() {