feat: add fish prompt nix shell indication, remove greeting, remove eza

home/pc/common/programs/fish.nix

@@ -4,24 +4,20 @@
     pkgs.nix-your-shell
     pkgs.lolcat
     pkgs.kittysay
-    pkgs.eza
   ];
 
   programs.fish = {
     enable = true;
     shellInit = ''
-      set -g fish_key_bindings fish_vi_key_bindings
-
       function fish_prompt
-        string join ' ' -- (set_color magenta) $(prompt_pwd) :3 (set_color normal)
+        if test -z $IN_NIX_SHELL
+          printf '%s%s λ %s' (set_color magenta) $(prompt_pwd) (set_color normal)
+        else
+          printf '%s%s%s [nix-shell %s]%s λ%s ' (set_color magenta) $(prompt_pwd) (set_color yellow) $IN_NIX_SHELL (set_color magenta) (set_color normal)
+        end
       end
 
       function fish_greeting
-        echo hii autumn :3\nthe time is $(date +%T) | kittysay | lolcat
-      end
-
-      function ls --description "List directory contents"
-        eza --icons=always $argv
       end
 
       function nix-shell --description "Start an interactive shell based on a Nix expression"