From 1c59a2d71b9d558b9ebe48f89a1cfe4c506b27c1 Mon Sep 17 00:00:00 2001
From: Mutsuha Asada <me@momee.mt>
Date: Tue, 10 Jun 2025 18:23:30 +0900
Subject: [PATCH] ocamlPackages-ancient: init at 0.10.0

---
 .../ocaml-modules/ancient/default.nix         | 42 +++++++++++++++++++
 pkgs/top-level/ocaml-packages.nix             |  2 +
 2 files changed, 44 insertions(+)
 create mode 100644 pkgs/development/ocaml-modules/ancient/default.nix

diff --git a/pkgs/development/ocaml-modules/ancient/default.nix b/pkgs/development/ocaml-modules/ancient/default.nix
new file mode 100644
index 000000000000..65743757be89
--- /dev/null
+++ b/pkgs/development/ocaml-modules/ancient/default.nix
@@ -0,0 +1,42 @@
+{
+  lib,
+  buildDunePackage,
+  fetchurl,
+}:
+buildDunePackage rec {
+  pname = "ancient";
+  version = "0.10.0";
+
+  minimalOCamlVersion = "4.12";
+
+  src = fetchurl {
+    url = "https://github.com/OCamlPro/ocaml-ancient/releases/download/${version}/ancient-${version}.tbz";
+    hash = "sha256-XeVUPrdg7QSV7V0Tz8Mkj5jvzKtYD9DON+tt9kkuCHM=";
+  };
+
+  doCheck = true;
+
+  meta = {
+    description = "Use data structures larger than available memory";
+    longDescription = ''
+      This module allows you to use in-memory data structures which are
+      larger than available memory and so are kept in swap.  If you try this
+      in normal OCaml code, you'll find that the machine quickly descends
+      into thrashing as the garbage collector repeatedly iterates over
+      swapped memory structures.  This module lets you break that
+      limitation.  Of course the module doesn't work by magic :-) If your
+      program tries to access these large structures, they still need to be
+      swapped back in, but it is suitable for large, sparsely accessed
+      structures.
+
+      Secondly, this module allows you to share those structures between
+      processes.  In this mode, the structures are backed by a disk file,
+      and any process that has read/write access that disk file can map that
+      file in and see the structures.
+    '';
+    homepage = "https://github.com/OCamlPro/ocaml-ancient";
+    changelog = "https://raw.githubusercontent.com/OCamlPro/ocaml-ancient/refs/tags/${version}/CHANGES.md";
+    license = lib.licenses.lgpl21Plus;
+    maintainers = with lib.maintainers; [ momeemt ];
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 506c88df82cd..e7f5691bbee6 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -30,6 +30,8 @@ let
 
         alsa = callPackage ../development/ocaml-modules/alsa { };
 
+        ancient = callPackage ../development/ocaml-modules/ancient { };
+
         angstrom = callPackage ../development/ocaml-modules/angstrom { };
 
         angstrom-async = callPackage ../development/ocaml-modules/angstrom-async { };