Add gmsh package

packages/gmsh/meta.yaml

@@ -0,0 +1,42 @@
+package:
+  name: gmsh
+  version: 4.15.1
+  top-level:
+    - gmsh
+source:
+  url: https://gmsh.info/src/gmsh-4.15.1-source.tgz
+  sha256: eba8e4064f6586c8ca880f1cfdf697f4d70f026f398a93b458f247f7e4364fed
+  patches:
+    - patches/0001-pyodide-library-loading.patch
+
+requirements:
+  host:
+    - libgmsh
+  run:
+    - libgmsh
+    - numpy
+
+build:
+  script: |
+    cat > setup.py << 'EOF'
+    from setuptools import setup
+    setup(
+        name="gmsh",
+        version="4.15.1",
+        py_modules=["gmsh"],
+        package_dir={"": "api"},
+    )
+    EOF
+
+test:
+  imports:
+    - gmsh
+
+about:
+  home: https://gmsh.info
+  PyPI: https://pypi.org/project/gmsh
+  license: GPL-2.0-or-later
+  summary: Gmsh Python API for mesh generation
+extra:
+  recipe-maintainers:
+    - pepijndevos

packages/gmsh/patches/0001-pyodide-library-loading.patch

@@ -0,0 +1,30 @@
+diff --git a/api/gmsh.py b/api/gmsh.py
+index a666f46..0e59b91 100644
+--- a/api/gmsh.py
++++ b/api/gmsh.py
+@@ -89,7 +89,7 @@ if not libpath:
+           " with ctypes.util.find_library() or in the following locations: " +
+           str(possible_libpaths))
+
+-lib = CDLL(libpath)
++lib = CDLL("libgmsh.so")
+
+ try_numpy = True # set this to False to never use numpy
+
+@@ -292,7 +292,7 @@ def initialize(argv=[], readConfigFiles=True, run=False, interruptible=True):
+         c_int(bool(run)),
+         byref(ierr))
+     if interruptible == True:
+-        prev_interrupt_handler = signal.signal(signal.SIGINT, signal.SIG_DFL)
++        pass
+     if ierr.value != 0:
+         raise Exception(logger.getLastError())
+
+@@ -323,7 +323,7 @@ def finalize():
+     lib.gmshFinalize(
+         byref(ierr))
+     if prev_interrupt_handler is not None:
+-        signal.signal(signal.SIGINT, prev_interrupt_handler)
++        pass
+     if ierr.value != 0:
+         raise Exception(logger.getLastError())

packages/gmsh/test_gmsh.py

@@ -0,0 +1,38 @@
+from pytest_pyodide import run_in_pyodide
+
+
+@run_in_pyodide(packages=["gmsh"])
+def test_gmsh_initialize(selenium):
+    import gmsh
+
+    gmsh.initialize()
+    assert gmsh.isInitialized() == 1
+    gmsh.finalize()
+
+
+@run_in_pyodide(packages=["gmsh"])
+def test_gmsh_mesh_2d(selenium):
+    import gmsh
+
+    gmsh.initialize()
+    gmsh.model.add("test")
+
+    # Create a square using the built-in GEO kernel
+    gmsh.model.geo.addPoint(0, 0, 0, 1.0, 1)
+    gmsh.model.geo.addPoint(1, 0, 0, 1.0, 2)
+    gmsh.model.geo.addPoint(1, 1, 0, 1.0, 3)
+    gmsh.model.geo.addPoint(0, 1, 0, 1.0, 4)
+    gmsh.model.geo.addLine(1, 2, 1)
+    gmsh.model.geo.addLine(2, 3, 2)
+    gmsh.model.geo.addLine(3, 4, 3)
+    gmsh.model.geo.addLine(4, 1, 4)
+    gmsh.model.geo.addCurveLoop([1, 2, 3, 4], 1)
+    gmsh.model.geo.addPlaneSurface([1], 1)
+    gmsh.model.geo.synchronize()
+
+    gmsh.model.mesh.generate(2)
+
+    node_tags, coords, _ = gmsh.model.mesh.getNodes()
+    assert len(node_tags) > 4  # More than just corner nodes
+
+    gmsh.finalize()

packages/libgmsh/meta.yaml

@@ -0,0 +1,83 @@
+package:
+  name: libgmsh
+  version: 4.15.1
+  tag:
+    - library
+    - shared_library
+source:
+  url: https://gmsh.info/src/gmsh-4.15.1-source.tgz
+  sha256: eba8e4064f6586c8ca880f1cfdf697f4d70f026f398a93b458f247f7e4364fed
+
+requirements:
+  host:
+    - libgmp
+
+build:
+  type: shared_library
+  script: |
+    embuilder build zlib --pic
+
+    mkdir -p build && cd build
+    emcmake cmake .. \
+      -DCMAKE_BUILD_TYPE=Release \
+      -DCMAKE_INSTALL_PREFIX=$WASM_LIBRARY_DIR \
+      -DENABLE_BUILD_SHARED=ON \
+      -DGMSH_RELEASE=1 \
+      \
+      -DCMAKE_C_FLAGS="${SIDE_MODULE_CFLAGS}" \
+      -DCMAKE_CXX_FLAGS="${SIDE_MODULE_CXXFLAGS}" \
+      -DCMAKE_SHARED_LINKER_FLAGS="${SIDE_MODULE_LDFLAGS}" \
+      \
+      -DENABLE_FLTK=OFF \
+      -DENABLE_OCC=OFF \
+      -DENABLE_OCC_CAF=OFF \
+      -DENABLE_OPENMP=OFF \
+      -DENABLE_GRAPHICS=OFF \
+      -DENABLE_OSMESA=OFF \
+      -DENABLE_CAIRO=OFF \
+      -DENABLE_MPEG_ENCODE=OFF \
+      -DENABLE_TESTS=OFF \
+      -DENABLE_TOUCHBAR=OFF \
+      -DENABLE_MED=OFF \
+      -DENABLE_CGNS=OFF \
+      -DENABLE_GETDP=OFF \
+      -DENABLE_MMG=OFF \
+      -DENABLE_GEOMETRYCENTRAL=OFF \
+      -DENABLE_NII2MESH=OFF \
+      -DENABLE_PRIVATE_API=OFF \
+      \
+      -DENABLE_MESH=ON \
+      -DENABLE_SOLVER=ON \
+      -DENABLE_POST=ON \
+      -DENABLE_PARSER=ON \
+      -DENABLE_PLUGINS=ON \
+      -DENABLE_EIGEN=ON \
+      -DENABLE_NETGEN=ON \
+      -DENABLE_METIS=ON \
+      -DENABLE_HXT=ON \
+      -DENABLE_BAMG=ON \
+      -DENABLE_BLOSSOM=ON \
+      -DENABLE_ANN=ON \
+      -DENABLE_ALGLIB=ON \
+      -DENABLE_GMP=ON \
+      -DENABLE_KBIPACK=ON \
+      -DENABLE_ONELAB=ON \
+      \
+      -DGMP_LIB=$WASM_LIBRARY_DIR/lib/libgmp.a \
+      -DGMP_INC=$WASM_LIBRARY_DIR/include \
+      \
+      -DSIZEOF_SIZE_T=4 \
+      -DHAVE_64BIT_SIZE_T=OFF
+
+    emmake make -j ${PYODIDE_JOBS:-16}
+    emmake make install
+
+    cp ${WASM_LIBRARY_DIR}/lib/libgmsh.so ${DISTDIR}
+
+about:
+  home: https://gmsh.info
+  license: GPL-2.0-or-later
+  summary: A three-dimensional finite element mesh generator with built-in CAD engine
+extra:
+  recipe-maintainers:
+    - pepijndevos