set fish prompt

home/fish.nix

@@ -37,6 +37,40 @@
     shellInit = ''
       set fish_greeting
     '';
+
+    functions = {
+      fish_prompt = ''
+        set -l last_status $status
+        set -l normal (set_color normal)
+        set -l status_color (set_color brgreen)
+        set -l cwd_color (set_color $fish_color_cwd)
+        set -l vcs_color (set_color brpurple)
+        set -l prompt_status ""
+
+        # Since we display the prompt on a new line allow the directory names to be longer.
+        set -q fish_prompt_pwd_dir_length
+        or set -lx fish_prompt_pwd_dir_length 0
+
+        # Color the prompt differently when we're root
+        set -l suffix '❯'
+        if functions -q fish_is_root_user; and fish_is_root_user
+            if set -q fish_color_cwd_root
+                set cwd_color (set_color $fish_color_cwd_root)
+            end
+            set suffix '#'
+        end
+
+        # Color the prompt in red on error
+        if test $last_status -ne 0
+            set status_color (set_color $fish_color_error)
+            set prompt_status $status_color "[" $last_status "]" $normal
+        end
+
+        echo -s (prompt_login) ' ' $cwd_color (prompt_pwd) $vcs_color (fish_vcs_prompt) $normal ' ' $prompt_status
+        echo -n -s $status_color $suffix ' ' $normal
+      '';
+
+    };
   };
 
   programs.fzf.enableFishIntegration = true;