[pixhost] add 'gallery' support (#3353)

docs/supportedsites.md

@@ -634,7 +634,7 @@ Consider all sites to be NSFW unless otherwise known.
 <tr>
     <td>Pixhost</td>
     <td>https://pixhost.to/</td>
-    <td>individual Images</td>
+    <td>Galleries, individual Images</td>
     <td></td>
 </tr>
 <tr>

gallery_dl/extractor/imagehosts.py

@@ -242,6 +242,25 @@ class PixhostImageExtractor(ImagehostImageExtractor):
         return url, filename
 
 
+class PixhostGalleryExtractor(ImagehostImageExtractor):
+    """Extractor for image galleries from pixhost.to"""
+    category = "pixhost"
+    subcategory = "gallery"
+    pattern = (r"(?:https?://)?((?:www\.)?pixhost\.(?:to|org)"
+               r"/gallery/([^/?#]+))")
+    test = ("https://pixhost.to/gallery/jSMFq", {
+        "pattern": PixhostImageExtractor.pattern,
+        "count": 3,
+    })
+
+    def items(self):
+        page = text.extr(self.request(
+            self.page_url).text, 'class="images"', "</div>")
+        data = {"_extractor": PixhostImageExtractor}
+        for url in text.extract_iter(page, '<a href="', '"'):
+            yield Message.Queue, url, data
+
+
 class PostimgImageExtractor(ImagehostImageExtractor):
     """Extractor for single images from postimages.org"""
     category = "postimg"