Add webp support

sigal/settings.py

@@ -40,7 +40,8 @@ _DEFAULT_CONFIG = {
     'google_tag_manager': '',
     'ignore_directories': [],
     'ignore_files': [],
-    'img_extensions': ['.jpg', '.jpeg', '.png', '.gif', '.tif', '.tiff'],
+    'img_extensions': ['.jpg', '.jpeg', '.png', '.gif', '.tif', '.tiff',
+                       '.webp'],
     'img_processor': 'ResizeToFit',
     'img_size': (640, 480),
     'img_format': None,

tests/test_gallery.py

@@ -62,11 +62,17 @@ REF = {
     'video': {
         'title': 'video',
         'name': 'video',
-        'thumbnail': ('video/thumbnails/'
-                      'example%20video.tn.jpg'),
+        'thumbnail': 'video/thumbnails/example%20video.tn.jpg',
         'subdirs': [],
         'medias': ['example video.ogv']
-    }
+    },
+    'webp': {
+        'title': 'webp',
+        'name': 'webp',
+        'thumbnail': 'webp/thumbnails/_MG_7805_lossy80.tn.webp',
+        'subdirs': [],
+        'medias': ['_MG_7805_lossy80.webp', '_MG_7808_lossy80.webp']
+    },
 }