nix: flatten homeModule implementation

nix/homeModules/common/packages.nix

@@ -0,0 +1,33 @@
+{ pkgs, lib, ... }:
+
+{
+
+  home = {
+    username = lib.mkDefault "leana";
+    homeDirectory = lib.mkMerge [
+      (lib.mkIf pkgs.stdenv.isLinux (lib.mkDefault "/home/leana"))
+      (lib.mkIf pkgs.stdenv.isDarwin (lib.mkDefault "/Users/leana"))
+    ];
+  };
+
+  programs = {
+    fish.enable = true;
+    git.enable = true;
+    vim.enable = true;
+  };
+
+  services.gpg-agent.enable = lib.mkIf pkgs.stdenv.isLinux true;
+
+  home.packages = lib.mkMerge [
+    [
+      pkgs.file
+      pkgs.gnused
+      pkgs.tree
+      pkgs.findutils # xargs and more
+    ]
+
+    # coreutils for darwin
+    (lib.mkIf pkgs.stdenv.isDarwin [ pkgs.uutils-coreutils-noprefix ])
+  ];
+
+}