fish: functions/fish_prompt: Add virtualfish

fish/.config/fish/conf.d/virtualfish-loader.fish

@@ -0,0 +1,4 @@
+set -g VIRTUALFISH_VERSION 2.5.4
+set -g VIRTUALFISH_PYTHON_EXEC /usr/bin/python
+source /usr/lib/python3.10/site-packages/virtualfish/virtual.fish
+emit virtualfish_did_setup_plugins

fish/.config/fish/functions/fish_prompt.fish

@@ -75,4 +75,8 @@ function fish_prompt
   if set -q SSH_TTY
     set -g fish_color_host brred
   end
+
+  if set -q VIRTUAL_ENV
+    echo -n -s (set_color -b blue white) "(" (basename "$VIRTUAL_ENV") ")" (set_color normal) " "
+  end
 end