From 3ef8e1eaa750a109911fa851a8a414be6eaa32cd Mon Sep 17 00:00:00 2001
From: Doron Behar <doron.behar@gmail.com>
Date: Tue, 23 Jun 2026 01:17:16 +0300
Subject: [PATCH] python3Packages.scippneutron: init at 26.6.0

---
 .../python-modules/scippneutron/default.nix   | 163 ++++++++++++++++++
 pkgs/top-level/python-packages.nix            |   2 +
 2 files changed, 165 insertions(+)
 create mode 100644 pkgs/development/python-modules/scippneutron/default.nix

diff --git a/pkgs/development/python-modules/scippneutron/default.nix b/pkgs/development/python-modules/scippneutron/default.nix
new file mode 100644
index 000000000000..67379dc882ad
--- /dev/null
+++ b/pkgs/development/python-modules/scippneutron/default.nix
@@ -0,0 +1,163 @@
+{
+  lib,
+  buildPythonPackage,
+  fetchFromGitHub,
+
+  # build-system
+  setuptools,
+  setuptools-scm,
+
+  # dependencies
+  email-validator,
+  h5py,
+  lazy-loader,
+  mpltoolbox,
+  numpy,
+  plopp,
+  pydantic,
+  python-dateutil,
+  scipp,
+  scippnexus,
+  scipy,
+
+  # tests
+  pytestCheckHook,
+  pooch,
+  hypothesis,
+  ipykernel,
+  ipympl,
+  psutil,
+  pytest-xdist,
+  pythreejs,
+  sciline,
+  stdenvNoCC,
+  curl,
+  cacert,
+}:
+
+buildPythonPackage (finalAttrs: {
+  pname = "scippneutron";
+  version = "26.6.0";
+  pyproject = true;
+  __structuredAttrs = true;
+
+  src = fetchFromGitHub {
+    owner = "scipp";
+    repo = "scippneutron";
+    tag = finalAttrs.version;
+    hash = "sha256-ZhQVOUX2LcoLtAvAos7CWfVHKfqIWtIsXeYAPbUZTV0=";
+  };
+
+  build-system = [
+    setuptools
+    setuptools-scm
+  ];
+
+  dependencies = [
+    email-validator
+    h5py
+    lazy-loader
+    mpltoolbox
+    numpy
+    plopp
+    pydantic
+    python-dateutil
+    scipp
+    scippnexus
+    scipy
+  ];
+
+  nativeCheckInputs = [
+    pytestCheckHook
+    hypothesis
+    ipykernel
+    ipympl
+    pooch
+    psutil
+    pytest-xdist
+    pythreejs
+    sciline
+  ];
+
+  env = {
+    # See: https://github.com/scipp/scippneutron/blob/26.6.0/src/scippneutron/data/__init__.py
+    SCIPPNEUTRON_DATA_DIR =
+      let
+        # NOTE this might be changed by upstream in the future.
+        _version = "5";
+      in
+      stdenvNoCC.mkDerivation {
+        name = "plopp-test-data";
+        dontUnpack = true;
+        strictDeps = true;
+        __structuredAttrs = true;
+        nativeBuildInputs = [
+          curl
+        ];
+        configurePhase = ''
+          curlVersion=$(curl -V | head -1 | cut -d' ' -f2)
+          curl=(
+              curl
+              --location
+              --max-redirs 20
+              --retry 3
+              --retry-all-errors
+              --continue-at -
+              --disable-epsv
+              --cookie-jar cookies
+              --user-agent "curl/$curlVersion Nixpkgs"
+          )
+          export SSL_CERT_FILE="${cacert}/etc/ssl/certs/ca-bundle.crt"
+          mkdir -p $out/${_version}
+        '';
+        buildPhase =
+          lib.pipe
+            [
+              "iris26176_graphite002_sqw.nxs"
+              "loki-at-larmor.hdf5"
+              "loki-at-larmor-filtered.hdf5"
+              "powder-event.h5"
+              "powder-event-filtered.h5"
+              "mcstas_sans.h5"
+              "CNCS_51936_event.nxs"
+              "GEM40979.raw"
+              "PG3_4844_calibration.h5"
+              "PG3_4844_event.nxs"
+              "PG3_4866_event.nxs"
+              "PG3_4871_event.nxs"
+              "WISH00016748.raw"
+              "horace_sqw_4d.sqw"
+              "dream_geant4_data.h5"
+            ]
+            [
+              (map (
+                f:
+                "curl \"https://public.esss.dk/groups/scipp/scippneutron/${_version}/${f}\" --output \"$out/${_version}/${f}\""
+              ))
+              (lib.concatStringsSep "\n")
+            ];
+        dontInstall = true;
+        dontFixup = true;
+        outputHash = "sha256-UxFphegP2VdQ7zMssAf8FQbrQqOr4+qVjcIugxz0ZxA=";
+        outputHashMode = "recursive";
+      };
+  };
+
+  # See <https://github.com/scipp/scippneutron/issues/710>. From some reason
+  # the whole file has to be deleted, otherwise the tests are not disabled.
+  preCheck = ''
+    rm tests/masking_tool_test.py
+  '';
+
+  pythonImportsCheck = [
+    "scippneutron"
+  ];
+
+  meta = {
+    description = "Neutron scattering toolkit built using scipp for Data Reduction. Not facility or instrument specific";
+    homepage = "https://scipp.github.io/scippneutron";
+    changelog = "https://github.com/scipp/scippneutron/releases/tag/${finalAttrs.src.tag}";
+    license = lib.licenses.bsd3;
+    maintainers = with lib.maintainers; [ doronbehar ];
+  };
+})
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 90272aca7ec7..64991aab42d8 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -17782,6 +17782,8 @@ self: super: with self; {
 
   scipp = callPackage ../development/python-modules/scipp { };
 
+  scippneutron = callPackage ../development/python-modules/scippneutron { };
+
   scippnexus = callPackage ../development/python-modules/scippnexus { };
 
   scipy = callPackage ../development/python-modules/scipy { };