Added images for different file formats

boards/models/attachment/viewers.py

@@ -13,6 +13,12 b' FILE_TYPES_AUDIO = ('
     'mp3',
 )
 
+PLAIN_FILE_FORMATS = {
+    'pdf': 'pdf',
+    'djvu': 'djvu',
+    'txt': 'txt',
+}
+
 
 def get_viewers():
     return AbstractViewer.__subclasses__()
@@ -35,9 +41,15 b' class AbstractViewer:'
                                self.file_type, filesizeformat(self.file.size))
 
     def get_format_view(self):
+        if self.file_type in PLAIN_FILE_FORMATS:
+            image = 'images/fileformats/{}.png'.format(
+                    PLAIN_FILE_FORMATS[self.file_type])
+        else:
+            image = FILE_STUB_IMAGE
+
         return '<a href="{}">'\
                '<img src="{}" width="200" height="150"/>'\
-               '</a>'.format(self.file.url, static(FILE_STUB_IMAGE))
+               '</a>'.format(self.file.url, static(image))
 
 
 class VideoViewer(AbstractViewer):