Add automatic dotfiles clone + stow

modules/home/dotfiles.nix clones ~/dotfiles on activation (only if not
already present) and stows every top-level package directory into
$HOME, independently per package so one conflict doesn't block the
rest. Removes home-manager's own git config management in favor of
letting the stowed ~/dotfiles/git/.gitconfig own it, and adds
homeConfigurations."tom@darwin" so the feature is usable on this Mac.
users/tom.nix now points home.dotfiles.repoUrl at the real repo.

1 files changed, 32 insertions, 0 deletions

diff --git a/modules/home/dotfiles.nix b/modules/home/dotfiles.nix
new file mode 100644
index 0000000..3df944c
--- /dev/null
+++ b/modules/home/dotfiles.nix
@@ -0,0 +1,32 @@
+{ config, lib, pkgs, ... }:
+let
+  cfg = config.home.dotfiles;
+  dotfilesDir = "${config.home.homeDirectory}/dotfiles";
+in
+{
+  options.home.dotfiles.repoUrl = lib.mkOption {
+    type = lib.types.str;
+    default = "";
+    description = "Git URL of the personal dotfiles repo to clone and stow into $HOME. Leave empty to disable.";
+  };
+
+  config = lib.mkIf (cfg.repoUrl != "") {
+    home.packages = [ pkgs.git pkgs.stow ];
+
+    home.activation.dotfiles = lib.hm.dag.entryAfter [ "writeBoundary" ] ''
+      DOTFILES_DIR=${lib.escapeShellArg dotfilesDir}
+      if [ ! -d "$DOTFILES_DIR/.git" ]; then
+        $DRY_RUN_CMD ${pkgs.git}/bin/git clone --recurse-submodules \
+          ${lib.escapeShellArg cfg.repoUrl} "$DOTFILES_DIR"
+      fi
+      if [ -d "$DOTFILES_DIR" ]; then
+        for pkg in "$DOTFILES_DIR"/*/; do
+          pkg_name="$(basename "$pkg")"
+          case "$pkg_name" in .*) continue ;; esac
+          $DRY_RUN_CMD ${pkgs.stow}/bin/stow -d "$DOTFILES_DIR" -t ${lib.escapeShellArg config.home.homeDirectory} "$pkg_name" \
+            || echo "Warning: stow failed for package '$pkg_name' — skipped." >&2
+        done
+      fi
+    '';
+  };
+}