views: Markup stream description using MessageBox.transform_content().

Footlinks support is added in a subsequent commit.

Test amended.

Fixes zulip#743.

Author: preetmishra

tests/ui_tools/test_popups.py

@@ -564,7 +564,7 @@ def mock_external_classes(self, mocker, monkeypatch):
             self.stream_id: {
                 'name': 'books',
                 'invite_only': False,
-                'description': 'hey',
+                'rendered_description': '<p>Hey</p>',
                 'subscribers': [],
                 'stream_weekly_traffic': 123,
             }
@@ -585,6 +585,34 @@ def test_keypress_stream_members(self, mocker, key, widget_size):
             stream_id=self.stream_id,
         )
 
+    @pytest.mark.parametrize('rendered_description, expected_markup', [
+        (
+            '<p>Simple</p>',
+            (None, ['', '', 'Simple']),
+        ),
+        (
+            '<p>A city in Italy <a href="http://genericlink.com">ABC</a>'
+            '<strong>Bold</strong>',
+            (None, ['', '', 'A city in Italy ', ('msg_link', 'ABC'), ' ',
+                    ('msg_link_index', '[1]'), ('msg_bold', 'Bold')]),
+        ),
+    ])
+    def test_markup_descrption(self, rendered_description, expected_markup,
+                               stream_id=10):
+        self.controller.model.stream_dict = {
+            stream_id: {
+                'name': 'ZT',
+                'invite_only': False,
+                'subscribers': [],
+                'stream_weekly_traffic': 123,
+                'rendered_description': rendered_description,
+            }
+        }
+
+        stream_info_view = StreamInfoView(self.controller, stream_id)
+
+        assert stream_info_view.markup_desc == expected_markup
+
     @pytest.mark.parametrize('key', {*keys_for_command('GO_BACK'),
                                      *keys_for_command('STREAM_DESC')})
     def test_keypress_exit_popup(self, key, widget_size):

zulipterminal/ui_tools/views.py

@@ -17,7 +17,7 @@
 from zulipterminal.helper import (
     Message, asynch, edit_mode_captions, match_stream, match_user,
 )
-from zulipterminal.ui_tools.boxes import PanelSearchBox
+from zulipterminal.ui_tools.boxes import MessageBox, PanelSearchBox
 from zulipterminal.ui_tools.buttons import (
     HomeButton, MentionedButton, MessageLinkButton, PMButton, StarredButton,
     StreamButton, TopicButton, UnreadPMButton, UserButton,
@@ -1087,18 +1087,22 @@ def __init__(self, controller: Any, stream_id: int) -> None:
         stream_marker = (STREAM_MARKER_PRIVATE if stream['invite_only']
                          else STREAM_MARKER_PUBLIC)
         title = '{} {}'.format(stream_marker, stream['name'])
+        rendered_desc = stream['rendered_description']
+        self.markup_desc, *_ = MessageBox.transform_content(
+            rendered_desc,
+            self.controller.model.server_url,
+        )
+        desc = urwid.Text(self.markup_desc)
+
+        stream_info_content = [
+            ('Stream Details', [
+                ('Weekly Message Count', str(weekly_msg_count)),
+                ('Stream Members', '{} (Press {} to view list)'.format(
+                  total_members, member_keys)),
+            ]),
+            ('Stream settings', []),
+        ]  # type: PopUpViewTableContent
 
-        desc = stream['description']
-
-        stream_info_content = [('', [desc]),
-                               ('Stream Details', [
-                                   ('Weekly Message Count',
-                                    str(weekly_msg_count)),
-                                   ('Stream Members',
-                                    '{} (Press {} to view list)'.format(
-                                        total_members, member_keys))
-                               ]),
-                               ('Stream settings', [])]
         popup_width, column_widths = self.calculate_table_widths(
             stream_info_content, len(title))
 
@@ -1117,9 +1121,14 @@ def __init__(self, controller: Any, stream_id: int) -> None:
         # Manual because calculate_table_widths does not support checkboxes.
         # Add 4 to checkbox label to accomodate the checkbox itself.
         popup_width = max(popup_width, len(muted_setting.label) + 4,
-                          len(pinned_setting.label) + 4)
+                          len(pinned_setting.label) + 4, desc.pack()[0])
         self.widgets = self.make_table_with_categories(stream_info_content,
                                                        column_widths)
+
+        # Stream description.
+        self.widgets.insert(0, desc)
+        self.widgets.insert(1, urwid.Text(''))  # Add a newline.
+
         self.widgets.append(muted_setting)
         self.widgets.append(pinned_setting)
         super().__init__(controller, self.widgets, 'STREAM_DESC', popup_width,