Refactor codebase to use nix modules

hmModules/apps/shells/xonsh/default.nix

@@ -0,0 +1,22 @@
+{ config, pkgs, lib, ... }:
+let rootPath = ./.; in
+{
+  options.xonsh = {
+    enable = lib.mkEnableOption "Enables xonsh";
+  };
+
+  config = lib.mkIf config.xonsh.enable {
+    home.packages = with pkgs; [
+      xonsh
+    ];
+    home.sessionVariables = {
+      PROMPT = "τ ";
+      RIGHT_PROMPT = "{YELLOW}{gitstatus: {} }{BLUE}{short_cwd}{DEFAULT}";
+      VI_MODE = 1;
+    };
+    xdg.configFile."xonshrc" = {
+      source = rootPath + "/rc.xsh";
+      target = "xonsh/rc.xsh";
+    };
+  };
+}

hmModules/apps/shells/xonsh/rc.xsh

@@ -0,0 +1,7 @@
+#!/usr/bin/env xonsh
+
+if $XONSH_INTERACTIVE:
+  if '__HM_SESS_VARS_SOURCED' in ${...}:
+    del $__HM_SESS_VARS_SOURCED
+  source-bash "$HOME/.nix-profile/etc/profile.d/hm-session-vars.sh" --suppress-skip-message
+  cat "$HOME/.cache/wallust/sequences"