typst: add support to instantiate typst with a set of typst packages

maintainers/scripts/update-typst-packages.py

···
             hash=source_hash,
             typstDeps=[
                 self.package_name_full(p, v)
-                for p, v in sorted(self.deps, key=lambda x: x[0])
+                for p, v in sorted(self.deps, key=lambda x: (x[0], Version(x[1])))
             ],
             description=self.description,
             license=self.license_tokens(),

pkgs/by-name/ty/typst/package.nix

···
   xz,
   nix-update-script,
   versionCheckHook,
+  callPackage,
 }:
 
 rustPlatform.buildRustPackage (finalAttrs: {
···
   versionCheckProgramArg = [ "--version" ];
   doInstallCheck = true;
 
-  passthru.updateScript = nix-update-script { };
+  passthru = {
+    updateScript = nix-update-script { };
+    packages = callPackage ./typst-packages.nix { };
+    withPackages = callPackage ./with-packages.nix { };
+  };
 
   meta = {
     changelog = "https://github.com/typst/typst/releases/tag/v${finalAttrs.version}";

pkgs/by-name/ty/typst/with-packages.nix

···
+{
+  lib,
+  buildEnv,
+  typstPackages,
+  makeBinaryWrapper,
+  typst,
+}:
+
+lib.makeOverridable (
+  { ... }@typstPkgs:
+  f:
+  buildEnv {
+    name = "${typst.name}-env";
+
+    paths = lib.foldl' (acc: p: acc ++ lib.singleton p ++ p.propagatedBuildInputs) [ ] (f typstPkgs);
+
+    pathsToLink = [ "/lib/typst-packages" ];
+
+    nativeBuildInputs = [ makeBinaryWrapper ];
+
+    postBuild = ''
+      export TYPST_LIB_DIR="$out/lib/typst/packages"
+      mkdir -p $TYPST_LIB_DIR
+
+      mv $out/lib/typst-packages $TYPST_LIB_DIR/preview
+
+      cp -r ${typst}/share $out/share
+      mkdir -p $out/bin
+
+      makeWrapper "${lib.getExe typst}" "$out/bin/typst" --set TYPST_PACKAGE_CACHE_PATH $TYPST_LIB_DIR
+    '';
+  }
+) typstPackages

pkgs/top-level/all-packages.nix

···
 
   buildTypstPackage = callPackage ../build-support/build-typst-package.nix { };
 
+  typstPackages = typst.packages;
+
   ueberzug = with python3Packages; toPythonApplication ueberzug;
 
   ueberzugpp = callPackage ../by-name/ue/ueberzugpp/package.nix {