From 8a7aecc594abd06fee3b6033abd1b848f24819b0 Mon Sep 17 00:00:00 2001
From: Oliver Lantwin <oliver.lantwin@cern.ch>
Date: Tue, 25 Nov 2025 08:26:33 +0100
Subject: [PATCH] feat: Add GeoModel recipe

---
 CHANGELOG.md     |  3 +++
 geomodel.sh      | 52 ++++++++++++++++++++++++++++++++++++++++++++++++
 nlohmann-json.sh | 39 ++++++++++++++++++++++++++++++++++++
 3 files changed, 94 insertions(+)
 create mode 100644 geomodel.sh
 create mode 100644 nlohmann-json.sh

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 79bcc0a4..76b425e5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,9 @@ Until May 2022 (inclusive) no changelog was kept. We might try to reconstruct it
 
 ### Added
 
+- GeoModel recipe (6.22.0) for detector description toolkit from CERN
+- nlohmann-json recipe (v3.12.0) for JSON library support (required by GeoModel)
+
 ### Fixed
 
 ### Changed
diff --git a/geomodel.sh b/geomodel.sh
new file mode 100644
index 00000000..99116175
--- /dev/null
+++ b/geomodel.sh
@@ -0,0 +1,52 @@
+package: GeoModel
+version: "%(tag_basename)s"
+tag: "6.22.0"
+source: https://gitlab.cern.ch/GeoModelDev/GeoModel.git
+requires:
+  - boost
+  - Eigen3
+  - XercesC
+  - sqlite
+  - nlohmann-json
+build_requires:
+  - CMake
+env:
+  GEOMODEL_ROOT: "$GEOMODEL_ROOT"
+prepend_path:
+  ROOT_INCLUDE_PATH: "$GEOMODEL_ROOT/include"
+  PATH: "$GEOMODEL_ROOT/bin"
+  LD_LIBRARY_PATH: "$GEOMODEL_ROOT/lib"
+---
+#!/bin/bash -e
+
+cmake "$SOURCEDIR" \
+      -DCMAKE_INSTALL_PREFIX="$INSTALLROOT" \
+      -DCMAKE_INSTALL_LIBDIR=lib \
+      ${CMAKE_BUILD_TYPE:+-DCMAKE_BUILD_TYPE=$CMAKE_BUILD_TYPE} \
+      ${CXXSTD:+-DCMAKE_CXX_STANDARD=$CXXSTD} \
+      -DBUILD_SHARED_LIBS=ON \
+      -DGEOMODEL_BUILD_TOOLS=ON \
+      -DGEOMODEL_BUILD_VISUALIZATION=OFF \
+      -DGEOMODEL_BUILD_EXAMPLES=OFF \
+      -DGEOMODEL_BUILD_TESTING=OFF \
+      -DGEOMODEL_BUILD_GEOMODELG4=OFF \
+      -DGEOMODEL_USE_BUILTIN_JSON=OFF \
+      ${BOOST_ROOT:+-DBoost_ROOT=$BOOST_ROOT} \
+      ${EIGEN3_ROOT:+-DEigen3_DIR=$EIGEN3_ROOT/share/eigen3/cmake} \
+      ${XERCESC_ROOT:+-DXercesC_DIR=$XERCESC_ROOT} \
+      ${SQLITE_ROOT:+-DSQLite3_ROOT=$SQLITE_ROOT} \
+      ${NLOHMANN_JSON_ROOT:+-Dnlohmann_json_DIR=$NLOHMANN_JSON_ROOT/share/cmake/nlohmann_json}
+
+cmake --build . ${JOBS:+-j$JOBS}
+cmake --install .
+
+# Modulefile
+MODULEDIR="$INSTALLROOT/etc/modulefiles"
+MODULEFILE="$MODULEDIR/$PKGNAME"
+mkdir -p "$MODULEDIR"
+alibuild-generate-module --bin --lib > "$MODULEFILE"
+cat >> "$MODULEFILE" <<EoF
+prepend-path ROOT_INCLUDE_PATH \$PKG_ROOT/include
+prepend-path CMAKE_PREFIX_PATH \$PKG_ROOT
+setenv GEOMODEL_ROOT \$PKG_ROOT
+EoF
diff --git a/nlohmann-json.sh b/nlohmann-json.sh
new file mode 100644
index 00000000..bf035888
--- /dev/null
+++ b/nlohmann-json.sh
@@ -0,0 +1,39 @@
+package: nlohmann-json
+version: "%(tag_basename)s"
+tag: v3.12.0
+source: https://github.com/nlohmann/json
+build_requires:
+  - CMake
+  - alibuild-recipe-tools
+---
+#!/bin/bash -e
+
+cmake "$SOURCEDIR" \
+      -DCMAKE_INSTALL_PREFIX="$INSTALLROOT" \
+      ${CMAKE_BUILD_TYPE:+-DCMAKE_BUILD_TYPE=$CMAKE_BUILD_TYPE} \
+      -DJSON_BuildTests=OFF \
+      -DJSON_Install=ON
+
+cmake --build . ${JOBS:+-j$JOBS}
+cmake --install .
+
+# Modulefile
+MODULEDIR="$INSTALLROOT/etc/modulefiles"
+MODULEFILE="$MODULEDIR/$PKGNAME"
+mkdir -p "$MODULEDIR"
+cat > "$MODULEFILE" <<EoF
+#%Module1.0
+proc ModulesHelp { } {
+  global version
+  puts stderr "ALICE Modulefile for $PKGNAME $PKGVERSION-@@PKGREVISION@$PKGHASH@@"
+}
+set version $PKGVERSION-@@PKGREVISION@$PKGHASH@@
+module-whatis "ALICE Modulefile for $PKGNAME $PKGVERSION-@@PKGREVISION@$PKGHASH@@"
+# Dependencies
+module load BASE/1.0
+# Our environment
+set NLOHMANN_JSON_ROOT \$::env(BASEDIR)/$PKGNAME/\$version
+setenv NLOHMANN_JSON_ROOT \$NLOHMANN_JSON_ROOT
+prepend-path ROOT_INCLUDE_PATH \$NLOHMANN_JSON_ROOT/include
+prepend-path CMAKE_PREFIX_PATH \$NLOHMANN_JSON_ROOT
+EoF