themes/ui: Add styling for different notification types.

This commit:
 * adds styles for various notification categories (inverted color
   backgrounds).
 * removes the default 'footer' style & use neutral style instead.

The categories with associated styles and footer used as of now:
 * success (task:success) - on successful completion of a task
 * warning (task:warning) - providing heads-up for a certain task
 * failure (task:failure) - on failure of a task
 * neutral (footer:neutral) - default notification style

zulipterminal/config/themes.py

@@ -35,7 +35,6 @@
     'msg_code': 'bold',
     'msg_bold': 'bold',
     'msg_time': 'bold',
-    'footer': 'standout',
     'starred': 'bold',
     'popup_category': 'bold',
     'unread_count': 'bold',
@@ -49,6 +48,10 @@
     'area:msg': 'standout',
     'area:stream': 'standout',
     'area:error': 'standout',
+    'footer:neutral': 'standout',
+    'task:success': 'standout',
+    'task:failure': 'standout',
+    'task:warning': 'standout',
 }
 
 
@@ -155,8 +158,6 @@
          None,             DEF['white:bold'],         DEF['black']),
         ('msg_time',       'black',                   'white',
          None,             DEF['black'],              DEF['white']),
-        ('footer',         'white',                   'dark red',
-         None,             DEF['white'],              DEF['dark_red']),
         ('starred',        'light red, bold',         'black',
          None,             DEF['light_red:bold'],     DEF['black']),
         ('popup_category', 'light blue, bold',        'black',
@@ -189,6 +190,14 @@
          None,             DEF['white'],              DEF['dark_cyan']),
         ('area:error',     'white',                   'dark red',
          None,             DEF['white'],               DEF['dark_red']),
+        ('footer:neutral', 'black',                   'light gray',
+         None,             DEF['black'],              DEF['light_gray']),
+        ('task:success',   'white',                   'dark green',
+         None,             DEF['white'],              DEF['dark_green']),
+        ('task:failure',   'white',                   'dark red',
+         None,             DEF['white'],              DEF['dark_red']),
+        ('task:warning',   'white',                   'brown',
+         None,             DEF['white'],              DEF['brown']),
     ],
     'gruvbox_dark': [
         # default colorscheme on 16 colors, gruvbox colorscheme
@@ -247,8 +256,6 @@
          None,             WHITEBOLD,         BLACK),
         ('msg_time',       'black',           'white',
          None,             BLACK,             WHITE),
-        ('footer',         'white',           'dark red',
-         None,             WHITE,             DARKRED),
         ('starred',        'light red, bold', 'black',
          None,             LIGHTREDBOLD,      BLACK),
         ('popup_category', 'light blue, bold', 'black',
@@ -281,6 +288,14 @@
          None,             BLACK,             LIGHTBLUE),
         ('area:error',     'white',           'dark red',
          None,             WHITE,             DARKRED),
+        ('footer:neutral', 'black',           'light gray',
+         None,             BLACK,             GRAY),
+        ('task:success',   'black',           'light green',
+         None,             BLACK,             LIGHTGREEN),
+        ('task:failure',   'white',           'dark red',
+         None,             WHITE,             DARKRED),
+        ('task:warning',   'black',           'light red',
+         None,             BLACK,             LIGHTRED),
     ],
     'zt_light': [
         (None,             'black',           'white'),
@@ -310,7 +325,6 @@
         ('msg_code',       'black',           'light gray'),
         ('msg_bold',       'white, bold',     'dark gray'),
         ('msg_time',       'white',           'dark gray'),
-        ('footer',         'white',           'dark red'),
         ('starred',        'light red, bold', 'white'),
         ('popup_category', 'dark gray, bold', 'light gray'),
         ('unread_count',   'dark blue, bold', 'white'),
@@ -327,6 +341,10 @@
         ('area:stream',    'black',           'light blue'),
         ('area:msg',       'black',           'yellow'),
         ('area:error',     'black',           'light red'),
+        ('footer:neutral', 'white',           'dark gray'),
+        ('task:success',   'black',           'dark green'),
+        ('task:failure',   'white',           'dark red'),
+        ('task:warning',   'black',           'yellow'),
     ],
     'zt_blue': [
         (None,             'black',           'light blue'),
@@ -356,7 +374,6 @@
         ('msg_code',       'dark blue',       'white'),
         ('msg_bold',       'white, bold',     'dark blue'),
         ('msg_time',       'dark blue',       'white'),
-        ('footer',         'white',           'dark red'),
         ('starred',        'light red, bold', 'light blue'),
         ('popup_category', 'light gray, bold', 'light blue'),
         ('unread_count',   'yellow',          'light blue'),
@@ -373,6 +390,10 @@
         ('area:stream',    'white',           'dark cyan'),
         ('area:msg',       'white',           'brown'),
         ('area:error',     'white',           'dark red'),
+        ('footer:neutral', 'white',           'dark gray'),
+        ('task:success',   'white',           'dark green'),
+        ('task:failure',   'white',           'dark red'),
+        ('task:warning',   'white',           'brown'),
     ]
 }
 

zulipterminal/ui.py

@@ -109,7 +109,7 @@ def set_typeahead_footer(self, suggestions: List[str],
 
     def footer_view(self) -> Any:
         text_header = self.get_random_help()
-        return urwid.AttrWrap(urwid.Text(text_header), 'footer')
+        return urwid.AttrWrap(urwid.Text(text_header), 'footer:neutral')
 
     def main_window(self) -> Any:
         self.left_panel = self.left_column_view()