show workspace name

fish/functions/fish_prompt.fish

@@ -3,7 +3,10 @@ function fish_prompt
 
     set -l host (hostname -s)
     if set -q DEVCONTAINER
-        set host DEV
+        set host (ls /workspaces | head -n 1)
+        if test -z "$host"
+            set host DEV
+        end
     end
     set_color (echo "$host" | md5sum | cut -c-6)
     echo -sn $host