WIP refactor

common/programs/rustDev.nix

@@ -0,0 +1,53 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+let
+  ccfg = import ../config.nix;
+  cfg_path = [
+    ccfg.custom_config_key
+    "programs"
+    "rustDev"
+  ];
+  cfg = lib.attrsets.getAttrFromPath cfg_path config;
+in
+{
+  options =
+    { }
+    // lib.attrsets.setAttrByPath cfg_path {
+      enable = lib.mkEnableOption "rust development tools";
+      repl = lib.mkOption {
+        type = lib.types.bool;
+        default = true;
+        description = "Enable the evcxr repl for `rust` command.";
+      };
+      # TODO?
+      # channel = lib.mkOption {
+      #   type = lib.types.str;
+      #   default = "stable";
+      #   description = "The Rust release channel to use (e.g., stable, beta, nightly).";
+      # };
+      # version = lib.mkOption {
+      #   type = lib.types.str;
+      #   default = "latest";
+      #   description = "The specific version of Rust to use. Use 'latest' for the latest stable release.";
+      # };
+    };
+
+  config = lib.mkIf cfg.enable {
+    environment.systemPackages =
+      with pkgs;
+      [
+        rustup
+        gcc
+      ]
+      ++ (if cfg.repl then [ pkgs.evcxr ] else [ ]);
+
+    environment.shellAliases = lib.mkIf cfg.repl {
+      rust = "evcxr";
+    };
+  };
+
+}