nix: +y-combinator-wallpaper

nix/packages/default.nix

@@ -2,10 +2,14 @@
   self,
   lib,
   inputs,
+
+  withSystem,
   ...
 }:
 
 {
+  imports = [ inputs.flakies.flakeModules.typstLib ];
+
   flake.lib.mkNerdFont = ./mkNerdFont.nix;
 
   flake.overlays.packages =
@@ -71,6 +75,18 @@
       ffgun = final.callPackage ./ffgun.nix { };
       easyscan = final.callPackage ./easyscan.nix { };
 
+      y-combinator-wallpaper = withSystem final.system (
+        { typstLib, ... }:
+        typstLib.typstDerivation.overrideAttrs {
+          src = ./y-combinator-wallpaper;
+          buildPhase = ''
+            runHook preBuild
+            typst compile main.typ "$out"/main.svg
+          '';
+          dontFixup = true;
+        }
+      );
+
       # Unmerged packages from nixfinal
       # TODO: use upstream when merged
       dl-librescore = final.callPackage ./dl-librescore.nix { };

nix/packages/y-combinator-wallpaper/main.typ

@@ -0,0 +1,13 @@
+#set page(width: 3840pt, height: 2160pt, fill: black)
+#set text(size: 2160pt / 16)
+#set align(horizon + center)
+
+#import "@preview/stonewall:0.1.0": lesbian
+#let y_combinator = $lambda f. space (
+    (lambda x. space f (x space x) space (lambda x. space f (x space x))
+  )$
+
+#text(
+  fill: gradient.linear(..(lesbian)),
+  y_combinator,
+)