Use ScippNeutron's metadata utilities

pyproject.toml

@@ -33,7 +33,7 @@ requires-python = ">=3.10"
 dependencies = [
     "sciline>=24.06.2",
     "scipp>=25.01.0",
-    "scippneutron>=24.11.0",
+    "scippneutron>=25.02.0",
     "scippnexus>=24.11.0",
 ]
 

requirements/base.in

@@ -4,5 +4,5 @@
 # The following was generated by 'tox -e deps', DO NOT EDIT MANUALLY!
 sciline>=24.06.2
 scipp>=25.01.0
-scippneutron>=24.11.0
+scippneutron>=25.02.0
 scippnexus>=24.11.0

requirements/base.txt

@@ -1,24 +1,34 @@
-# SHA1:d18487328be0c30ec0a6929501d1c4a58c71bd48
+# SHA1:0aac37186f254abb39dbd8f3c3c6ad52bafc0553
 #
 # This file is autogenerated by pip-compile-multi
 # To update, run:
 #
 #    pip-compile-multi
 #
+annotated-types==0.7.0
+    # via pydantic
 contourpy==1.3.1
     # via matplotlib
 cyclebane==24.10.0
     # via sciline
 cycler==0.12.1
     # via matplotlib
+dnspython==2.7.0
+    # via email-validator
+email-validator==2.2.0
+    # via scippneutron
 fonttools==4.56.0
     # via matplotlib
 h5py==3.12.1
     # via
     #   scippneutron
     #   scippnexus
+idna==3.10
+    # via email-validator
 kiwisolver==1.4.8
     # via matplotlib
+lazy-loader==0.4
+    # via scippneutron
 matplotlib==3.10.0
     # via
     #   mpltoolbox
@@ -27,7 +37,7 @@ mpltoolbox==24.5.1
     # via scippneutron
 networkx==3.4.2
     # via cyclebane
-numpy==2.2.2
+numpy==2.2.3
     # via
     #   contourpy
     #   h5py
@@ -37,16 +47,23 @@ numpy==2.2.2
     #   scippneutron
     #   scipy
 packaging==24.2
-    # via matplotlib
+    # via
+    #   lazy-loader
+    #   matplotlib
 pillow==11.1.0
     # via matplotlib
 plopp==24.10.0
     # via scippneutron
+pydantic==2.10.6
+    # via scippneutron
+pydantic-core==2.27.2
+    # via pydantic
 pyparsing==3.2.1
     # via matplotlib
 python-dateutil==2.9.0.post0
     # via
     #   matplotlib
+    #   scippneutron
     #   scippnexus
 sciline==24.10.0
     # via -r base.in
@@ -55,15 +72,19 @@ scipp==25.2.0
     #   -r base.in
     #   scippneutron
     #   scippnexus
-scippneutron==25.1.0
+scippneutron==25.2.0
     # via -r base.in
 scippnexus==24.11.1
     # via
     #   -r base.in
     #   scippneutron
-scipy==1.15.1
+scipy==1.15.2
     # via
     #   scippneutron
     #   scippnexus
 six==1.17.0
     # via python-dateutil
+typing-extensions==4.12.2
+    # via
+    #   pydantic
+    #   pydantic-core

requirements/basetest.txt

@@ -19,10 +19,6 @@ cycler==0.12.1
     # via matplotlib
 decorator==5.1.1
     # via ipython
-exceptiongroup==1.2.2
-    # via
-    #   ipython
-    #   pytest
 executing==2.2.0
     # via stack-data
 fonttools==4.56.0
@@ -47,7 +43,7 @@ matplotlib==3.10.0
     # via plopp
 matplotlib-inline==0.1.7
     # via ipython
-numpy==2.2.2
+numpy==2.2.3
     # via
     #   contourpy
     #   matplotlib
@@ -90,7 +86,7 @@ requests==2.32.3
     # via pooch
 scipp==25.2.0
     # via tof
-scipy==1.15.1
+scipy==1.15.2
     # via
     #   -r basetest.in
     #   tof
@@ -100,16 +96,12 @@ stack-data==0.6.3
     # via ipython
 tof==25.2.0
     # via -r basetest.in
-tomli==2.2.1
-    # via pytest
 traitlets==5.14.3
     # via
     #   comm
     #   ipython
     #   ipywidgets
     #   matplotlib-inline
-typing-extensions==4.12.2
-    # via ipython
 urllib3==2.3.0
     # via requests
 wcwidth==0.2.13

requirements/ci.txt

@@ -44,14 +44,8 @@ requests==2.32.3
     # via -r ci.in
 smmap==5.0.2
     # via gitdb
-tomli==2.2.1
-    # via
-    #   pyproject-api
-    #   tox
 tox==4.24.1
     # via -r ci.in
-typing-extensions==4.12.2
-    # via tox
 urllib3==2.3.0
     # via requests
 virtualenv==20.29.2

requirements/dev.txt

@@ -12,8 +12,6 @@
 -r static.txt
 -r test.txt
 -r wheels.txt
-annotated-types==0.7.0
-    # via pydantic
 anyio==4.8.0
     # via
     #   httpx
@@ -32,7 +30,7 @@ click==8.1.8
     # via
     #   pip-compile-multi
     #   pip-tools
-copier==9.4.1
+copier==9.5.0
     # via -r dev.in
 dunamai==1.23.0
     # via copier
@@ -91,10 +89,6 @@ prometheus-client==0.21.1
     # via jupyter-server
 pycparser==2.22
     # via cffi
-pydantic==2.10.6
-    # via copier
-pydantic-core==2.27.2
-    # via pydantic
 python-json-logger==3.2.1
     # via jupyter-events
 questionary==2.1.0

requirements/docs.txt

@@ -10,8 +10,6 @@ accessible-pygments==0.0.5
     # via pydata-sphinx-theme
 alabaster==1.0.0
     # via sphinx
-appnope==0.1.4
-    # via ipykernel
 asttokens==3.0.0
     # via stack-data
 attrs==25.1.0
@@ -48,16 +46,12 @@ docutils==0.21.2
     #   nbsphinx
     #   pydata-sphinx-theme
     #   sphinx
-exceptiongroup==1.2.2
-    # via ipython
 executing==2.2.0
     # via stack-data
 fastjsonschema==2.21.1
     # via nbformat
 graphviz==0.20.3
     # via -r docs.in
-idna==3.10
-    # via requests
 imagesize==1.4.1
     # via sphinx
 importlib-resources==6.5.2
@@ -141,7 +135,7 @@ platformdirs==4.3.6
     # via jupyter-core
 prompt-toolkit==3.0.50
     # via ipython
-psutil==6.1.1
+psutil==7.0.0
     # via ipykernel
 ptyprocess==0.7.0
     # via pexpect
@@ -209,8 +203,6 @@ tinycss2==1.4.0
     # via bleach
 tof==25.2.0
     # via -r docs.in
-tomli==2.2.1
-    # via sphinx
 tornado==6.4.2
     # via
     #   ipykernel
@@ -228,13 +220,6 @@ traitlets==5.14.3
     #   nbconvert
     #   nbformat
     #   nbsphinx
-typing-extensions==4.12.2
-    # via
-    #   beautifulsoup4
-    #   ipython
-    #   mistune
-    #   pydata-sphinx-theme
-    #   referencing
 urllib3==2.3.0
     # via requests
 wcwidth==0.2.13

requirements/nightly.txt

@@ -32,10 +32,6 @@ dnspython==2.7.0
     # via email-validator
 email-validator==2.2.0
     # via scippneutron
-exceptiongroup==1.2.2
-    # via
-    #   ipython
-    #   pytest
 executing==2.2.0
     # via stack-data
 fonttools==4.56.0
@@ -74,7 +70,7 @@ mpltoolbox==24.5.1
     # via scippneutron
 networkx==3.4.2
     # via cyclebane
-numpy==2.2.2
+numpy==2.2.3
     # via
     #   contourpy
     #   h5py
@@ -142,7 +138,7 @@ scippnexus @ git+https://github.com/scipp/scippnexus@main
     # via
     #   -r nightly.in
     #   scippneutron
-scipy==1.15.1
+scipy==1.15.2
     # via
     #   -r nightly.in
     #   scippneutron
@@ -154,8 +150,6 @@ stack-data==0.6.3
     # via ipython
 tof @ git+https://github.com/scipp/tof@main
     # via -r nightly.in
-tomli==2.2.1
-    # via pytest
 traitlets==5.14.3
     # via
     #   comm
@@ -164,7 +158,6 @@ traitlets==5.14.3
     #   matplotlib-inline
 typing-extensions==4.12.2
     # via
-    #   ipython
     #   pydantic
     #   pydantic-core
 urllib3==2.3.0

requirements/wheels.txt

@@ -11,5 +11,3 @@ packaging==24.2
     # via build
 pyproject-hooks==1.2.0
     # via build
-tomli==2.2.1
-    # via build

src/ess/reduce/nexus/_nexus_loader.py

@@ -8,14 +8,16 @@
 from contextlib import AbstractContextManager, contextmanager, nullcontext
 from dataclasses import dataclass
 from math import prod
-from typing import cast
+from typing import TypeVar, cast
 
 import scipp as sc
 import scippnexus as snx
 
 from ..logging import get_logger
 from .types import (
+    Beamline,
     FilePath,
+    Measurement,
     NeXusAllLocationSpec,
     NeXusEntryName,
     NeXusFile,
@@ -27,6 +29,8 @@
 class NoNewDefinitionsType: ...
 
 
+_Model = TypeVar('_Model', Beamline, Measurement)
+
 NoNewDefinitions = NoNewDefinitionsType()
 
 
@@ -74,6 +78,18 @@ def load_all_components(
     return components
 
 
+def load_metadata(
+    file_path: FilePath | NeXusFile | NeXusGroup,
+    model: type[_Model],
+    *,
+    entry_name: NeXusEntryName | None = None,
+    definitions: Mapping | NoNewDefinitionsType = NoNewDefinitions,
+) -> _Model:
+    with _open_nexus_file(file_path, definitions=definitions) as f:
+        entry = _unique_child_group(f, snx.NXentry, entry_name)
+        return model.from_nexus_entry(entry)
+
+
 def compute_component_position(dg: sc.DataGroup) -> sc.DataGroup:
     # In some downstream packages we use some of the Nexus components which attempt
     # to compute positions without having actual Nexus data defining depends_on chains.

src/ess/reduce/nexus/types.py

@@ -7,6 +7,7 @@
 import sciline
 import scipp as sc
 import scippnexus as snx
+from scippneutron import metadata as scn_meta
 
 FilePath = NewType('FilePath', Path)
 """Full path to a NeXus file on disk."""
@@ -177,6 +178,13 @@ class TransmissionRun(Generic[ScatteringRunType]):
 UniqueComponent = TypeVar('UniqueComponent', snx.NXsample, snx.NXsource)
 """Components that can be identified by their type as there will only be one."""
 
+Beamline = scn_meta.Beamline
+"""Beamline metadata."""
+Measurement = scn_meta.Measurement
+"""measurement metadata."""
+Source = scn_meta.Source
+"""Neutron source metadata."""
+
 
 class NeXusName(sciline.Scope[Component, str], str):
     """Name of a component in a NeXus file."""