hmApps, refactor, clean up, break groups

hmModules/apps/fish/app.nix

@@ -0,0 +1,43 @@
+{ config, lib, ... }:
+let
+  functionModule = with lib.types; submodule {
+    options = {
+      body = lib.mkOption { type = lines; };
+      wraps = lib.mkOption {
+        type = nullOr str;
+        default = null;
+      };
+    };
+  };
+in {
+  options.fish = {
+    enable = lib.mkEnableOption "Enables fish";
+    extraFunctions = lib.mkOption {
+      type = with lib.types; attrsOf (either lines functionModule);
+      default = {};
+    };
+  };
+
+  config = lib.mkIf config.fish.enable {
+    programs.fish = {
+      enable = true;
+      functions = {
+        fish_greeting = "";
+        fish_prompt = ''
+          if test $status -eq 0
+              echo -n -s (set_color blue -o) τ " " (set_color normal)
+          else
+              echo -n -s (set_color red -o) τ " " (set_color normal)
+          end
+        '';
+        fish_right_prompt = ''
+          git_prompt
+          echo -n -s (set_color blue) (prompt_pwd) " "
+          echo -n -s (set_color yellow) $CMD_DURATION ms
+          echo -n -s (set_color normal)
+        '';
+        git_prompt = ''${builtins.readFile ./functions/git_prompt.fish}'';
+      } // config.fish.extraFunctions;
+    };
+  };
+}