[fish] Show whether my work VPN is active

fish/.config/fish/config.fish

@@ -24,6 +24,11 @@ function fish_prompt --description 'Write out the prompt'
         set color_host $fish_color_host_remote
     end
 
+    if test -e "$XDG_RUNTIME_DIR/openconnect_vpn.pid"
+        set_color -b red
+        echo -n -s "[VPN]" $normal
+    end
+
     # Write pipestatus
     set -l prompt_status (__fish_print_pipestatus " [" "]" "|" (set_color $fish_color_status) (set_color --bold $fish_color_status) $last_pipestatus)