terminal/shell: add transient fish integration

home/terminal/shell/fish.nix

@@ -1,9 +1,27 @@
-{pkgs, ...}: {
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}: let
+  starshipTransient = lib.strings.optionalString config.programs.starship.enableTransience ''
+    function starship_transient_prompt_func
+      starship module character
+    end
+
+    function starship_transient_rprompt_func
+      starship module cmd_duration
+    end
+  '';
+in {
   programs.fish = {
     enable = true;
-    interactiveShellInit = ''
+    interactiveShellInit =
+      starshipTransient
+      + ''
         set fish_greeting # Disable greeting
         fish_vi_key_bindings # Enable Vi mode
+
       '';
     shellAbbrs = {
       cd = "z";

home/terminal/shell/starship.nix

@@ -2,5 +2,13 @@
   programs.starship = {
     enable = true;
     enableTransience = true;
+    settings = {
+      add_newline = true;
+
+      cmd_duration = {
+        style = "yellow";
+        format = "[ $duration]($style)";
+      };
+    };
   };
 }