From a6bee1f790f4177d5096ae2ab570a3511676f96a Mon Sep 17 00:00:00 2001
From: Leo Singer <leo.singer@ligo.org>
Date: Sun, 12 Nov 2023 19:49:53 -0500
Subject: [PATCH] Build for Windows

Fixes #47.
---
 .github/workflows/cibuildwheel.yml | 10 +++++++++-
 README.md                          |  5 -----
 meson.build                        |  5 +++++
 pyproject.toml                     |  5 +++++
 4 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/.github/workflows/cibuildwheel.yml b/.github/workflows/cibuildwheel.yml
index 468e258..c359c7e 100644
--- a/.github/workflows/cibuildwheel.yml
+++ b/.github/workflows/cibuildwheel.yml
@@ -29,7 +29,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest]
+        os: [ubuntu-latest, macos-latest, windows-latest]
 
     steps:
       - uses: actions/checkout@v4
@@ -40,10 +40,18 @@ jobs:
         with:
           platforms: arm64
 
+      # See https://docs.scipy.org/doc/scipy/building/index.html
+      - name: Install MinGW
+        if: runner.os == 'Windows'
+        run: |
+          choco install rtools -y --no-progress --force --version=4.0.0.20220206
+          echo "c:\rtools40\ucrt64\bin;" >> $env:GITHUB_PATH
+
       - name: Build wheels
         uses: pypa/cibuildwheel@v2.16
         env:
           CIBW_ARCHS_LINUX: auto aarch64
+          CIBW_ARCHS_WINDOWS: AMD64
           CIBW_ENVIRONMENT_MACOS: FC=gfortran-11
           # Skip musllinux wheels, which take a long time to build because Numpy must be built from source
           # Skip PyPy wheels
diff --git a/README.md b/README.md
index beae404..00022b6 100644
--- a/README.md
+++ b/README.md
@@ -48,11 +48,6 @@ following articles:
 
 * The CCMC IGRF code has spatially varying errors of a few percent, which will
   result in a striped pattern in the resulting particle flux.
-* This package does not support Windows yet. If you are a Windows developer,
-  then please help us out by contributing a pull request! Meanwhile, if you
-  need to use this package on Windows, then we recommend using Python under
-  Linux within Windows Subsystem for Linux (WSL), Docker, or a virtual machine.
-  See https://github.com/nasa/radbelt/issues/47.
 
 [International Geomagnetic Reference Field (IGRF)]: https://www.ngdc.noaa.gov/IAGA/vmod/igrf.html
 [Astropy]: https://www.astropy.org
diff --git a/meson.build b/meson.build
index 9507b1f..0af56cf 100644
--- a/meson.build
+++ b/meson.build
@@ -11,6 +11,11 @@ add_global_arguments(
 
 add_languages('fortran')
 
+is_windows = host_machine.system() == 'windows'
+if is_windows
+  add_project_link_arguments('-lquadmath', language : 'c')
+endif
+
 py_mod = import('python')
 py = py_mod.find_installation(pure: false)
 
diff --git a/pyproject.toml b/pyproject.toml
index 1c76555..a987fa3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,6 +16,7 @@ classifiers = [
     "Intended Audience :: Science/Research",
     "License :: OSI Approved",
     "Operating System :: MacOS",
+    "Operating System :: Microsoft :: Windows",
     "Operating System :: POSIX",
     "Operating System :: POSIX :: Linux",
     "Operating System :: Unix",
@@ -40,3 +41,7 @@ test = ["pytest-doctestplus"]
 [tool.cibuildwheel]
 test-extras = ["test"]
 test-command = "pytest --pyargs radbelt --doctest-plus"
+
+[tool.cibuildwheel.windows]
+before-build = "pip install delvewheel"
+repair-wheel-command = "delvewheel repair -w {dest_dir} {wheel}"