1 files changed, 69 insertions, 12 deletions
diff --git a/default.nix b/default.nix
index 2eb7dbb1f80b..9c54a7d4707c 100644
--- a/default.nix
+++ b/default.nix
@@ -1,14 +1,71 @@
-with import <nixpkgs> {};
-
-stdenv.mkDerivation rec {
-  name = "immer-git";
-  version = "git";
-  src = fetchGit ./.;
-  nativeBuildInputs = [ cmake ];
-  dontBuild = true;
-  meta = with stdenv.lib; {
-    homepage    = "https://github.com/arximboldi/immer";
-    description = "Postmodern immutable data structures for C++";
-    license     = licenses.boost;
+# This file sets up the top-level package set by traversing the package tree
+# (see read-tree.nix for details) and constructing a matching attribute set
+# tree.
+#
+# This makes packages accessible via the Nixery instance that is configured to
+# use this repository as its nixpkgs source.
+
+{ ... }@args:
+
+with builtins;
+
+let
+  # This definition of fix is identical to <nixpkgs>.lib.fix, but the global
+  # package set is not available here.
+  fix = f: let x = f x; in x;
+
+  # Global configuration that all packages are called with.
+  config = depot: {
+    inherit depot;
+
+    # Expose lib & ciBuilds attributes to packages.
+    inherit (depot) ciBuilds lib;
+
+    # Pass third_party as 'pkgs' (for compatibility with external
+    # imports for certain subdirectories)
+    pkgs = depot.third_party;
+  };
+
+  readTree' = import ./nix/readTree {};
+
+  localPkgs = readTree: {
+    fun           = readTree ./fun;
+    lisp          = readTree ./lisp;
+    net           = readTree ./net;
+    nix           = readTree ./nix;
+    ops           = readTree ./ops;
+    presentations = readTree ./presentations;
+    third_party   = readTree ./third_party;
+    tools         = readTree ./tools;
+    users         = readTree ./users;
+    web           = readTree ./web;
+  };
+in fix(self: {
+  config = config self;
+
+  # Elevate 'lib' from nixpkgs
+  lib = import (self.third_party.nixpkgsSrc + "/lib");
+
+  # Expose readTree for downstream repo consumers.
+  readTree = {
+    __functor = x: (readTree' x.config);
+    config = self.config;
   };
+
+  # Make the path to the depot available for things that might need it
+  # (e.g. NixOS module inclusions)
+  depotPath = ./.;
+
+  # Load CI builds in a way that can be injected into programs like besadii.
+  ciBuilds = import ./ci-builds.nix self.config;
 }
+
+# Add local packages as structured by readTree
+// (localPkgs (readTree' self.config))
+
+# Load overrides into the top-level.
+#
+# This can be used to move things from third_party into the top-level, too (such
+# as `lib`).
+// (readTree' { depot = self; pkgs = self.third_party; }) ./overrides
+)