From 9b718da230d07de8f6f76455bb499a53a7d4a9b4 Mon Sep 17 00:00:00 2001
From: Jake Hamilton <jake.hamilton@hey.com>
Date: Fri, 23 Feb 2024 08:57:44 -0800
Subject: [PATCH] feat: add lib and inputs args to overlay

Overlays previously would only receive a "channels" argument and the
rest of the attribute set would be the flake's inputs. This is now
changing to support passing "lib", the same instance you would get
in your system configuration, and "inputs", an attribute set of the
flake's inputs. Referencing flake inputs by name here is now
deprecated and will be removed in a future update.
---
 snowfall-lib/overlay/default.nix | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/snowfall-lib/overlay/default.nix b/snowfall-lib/overlay/default.nix
index 5dd702c..4419542 100644
--- a/snowfall-lib/overlay/default.nix
+++ b/snowfall-lib/overlay/default.nix
@@ -26,7 +26,16 @@ in {
       extra-overlays ? [],
     }: channels: let
       user-overlays = snowfall-lib.fs.get-default-nix-files-recursive src;
-      create-overlay = overlay: import overlay (user-inputs // {inherit channels;});
+      create-overlay = overlay:
+        import overlay (
+          # Deprecated: Use `inputs.*` instead of referencing the input name directly.
+          user-inputs
+          // {
+            inherit channels;
+            inputs = user-inputs;
+            lib = snowfall-lib.internal.system-lib;
+          }
+        );
       user-packages-overlay = final: prev: let
         user-packages = snowfall-lib.package.create-packages {
           pkgs = final;
@@ -89,7 +98,15 @@ in {
           name = builtins.unsafeDiscardStringContext (snowfall-lib.path.get-parent-directory file);
           overlay = final: prev: let
             channels = channel-systems.${prev.system};
-            user-overlay = import file (user-inputs // {inherit channels;});
+            user-overlay = import file (
+              # Deprecated: Use `inputs.*` instead of referencing the input name directly.
+              user-inputs
+              // {
+                inherit channels;
+                inputs = user-inputs;
+                lib = snowfall-lib.internal.system-lib;
+              }
+            );
             packages = user-packages-overlay final prev;
             prev-with-packages =
               if package-namespace == null