BLD: Attempt to build using spin

This commit is the first commit to try and move from poetry to spin.

It is not working at the moment, namely the test runner cannot find the
given tests.

Author: Kai-Striega

environment.yml

@@ -0,0 +1,21 @@
+# To use:
+#   $ conda env create -f environment.yml  # `mamba` works too for this command
+#   $ conda activate numpy-financial-dev
+#
+name: numpy-financial-dev
+channels:
+  - conda-forge
+dependencies:
+  - python
+  - cython>=3.0.9
+  - compilers
+  - meson
+  - meson-python
+  - ninja
+  - numpy
+  - pytest
+  - pytest-xdist
+  - asv>=0.6.0
+  - hypothesis
+  - myst-parser
+  - spin

meson.build

@@ -0,0 +1,19 @@
+project(
+    'numpy-financial',
+    'cython',
+    version: '2.0.0.dev',
+    license: 'BSD-3',
+    meson_version: '>=1.4.0',
+)
+
+cy = meson.get_compiler('cython')
+
+if not cy.version().version_compare('>=3.0.9')
+  error('NumPy-Financial requires Cython >= 3.0.9')
+endif
+
+py = import('python').find_installation(pure: false)
+py_dep = py.dependency()
+
+subdir('numpy_financial')
+subdir('tests')

numpy_financial/_cfinancial.pyx

@@ -0,0 +1,18 @@
+from libc.math cimport NAN
+
+
+def _cnpv(const double[::1] rates, const double[:, ::1] values, double[:, ::1] out):
+    cdef:
+        Py_ssize_t i, j, t
+        double acc
+
+    for i in range(rates.shape[0]):
+        for j in range(values.shape[0]):
+            acc = 0.0
+            for t in range(values.shape[1]):
+                if rates[i] == -1.0:
+                    acc = NAN
+                    break
+                else:
+                    acc += values[j, t] / ((1.0 + rates[i]) ** t)
+            out[i, j] = acc

numpy_financial/_financial.py

@@ -13,8 +13,8 @@
 
 from decimal import Decimal
 
-import numba as nb
 import numpy as np
+from _cfinancial import _cnpv
 
 __all__ = ['fv', 'pmt', 'nper', 'ipmt', 'ppmt', 'pv', 'rate',
            'irr', 'npv', 'mirr',
@@ -844,20 +844,6 @@ def irr(values, *, raise_exceptions=False):
     return eirr[np.argmin(abs_eirr)]
 
 
-@nb.njit
-def _npv_native(rates, values, out):
-    for i in range(rates.shape[0]):
-        for j in range(values.shape[0]):
-            acc = 0.0
-            for t in range(values.shape[1]):
-                if rates[i] == -1.0:
-                    acc = np.nan
-                    break
-                else:
-                    acc += values[j, t] / ((1.0 + rates[i]) ** t)
-            out[i, j] = acc
-
-
 def npv(rate, values):
     r"""Return the NPV (Net Present Value) of a cash flow series.
 
@@ -948,7 +934,7 @@ def npv(rate, values):
 
     output_shape = _get_output_array_shape(rate_inner, values_inner)
     out = np.empty(output_shape)
-    _npv_native(rate_inner, values_inner, out)
+    _cnpv(rate_inner, values_inner, out)
     return _ufunc_like(out)
 
 

numpy_financial/meson.build

@@ -0,0 +1,15 @@
+py.extension_module(
+    '_cfinancial',
+    '_cfinancial.pyx',
+    install: true,
+    subdir: 'numpy_financial',
+)
+
+python_sources = [
+    '_financial.py',
+]
+
+py.install_sources(
+    python_sources,
+    subdir: 'numpy_financial',
+)

pyproject.toml

@@ -1,11 +1,15 @@
 [build-system]
-requires = ["poetry-core"]
-build-backend = "poetry.core.masonry.api"
-
+build-backend = "mesonpy"
+requires = [
+    "meson-python>=0.15.0",
+    "Cython>=3.0.9",
+    "numpy>=1.23.5",
+]
 
-[tool.poetry]
+[project]
 name = "numpy-financial"
 version = "2.0.0"
+requires-python = ">=3.10"
 description = "Simple financial functions"
 license = "BSD-3-Clause"
 authors = ["Travis E. Oliphant et al."]
@@ -34,30 +38,41 @@ classifiers = [
     "Operating System :: Unix",
     "Operating System :: MacOS",
 ]
-packages = [{include = "numpy_financial"}]
-
-[tool.poetry.dependencies]
-python = "^3.10"
-numpy = "^1.23"
-numba = "^0.59.1"
-
-[tool.poetry.group.test.dependencies]
-pytest = "^8.0"
-hypothesis = {extras = ["numpy"], version = "^6.99.11"}
-pytest-xdist = {extras = ["psutil"], version = "^3.5.0"}
-
-
-[tool.poetry.group.docs.dependencies]
-sphinx = "^7.0"
-numpydoc = "^1.5"
-pydata-sphinx-theme = "^0.15"
-myst-parser = "^2.0.0"
-
 
+[project.optional-dependencies]
+test = [
+    "pytest",
+    "pytest-xdist",
+    "hypothesis",
+]
+doc = [
+    "sphinx>=7.0",
+    "numpydoc>=1.5",
+    "pydata-sphinx-theme>=0.15",
+    "myst-parser>=2.0.0",
+]
+dev = [
+    "ruff>=0.3.0",
+    "asv>=0.6.0",
+]
 
-[tool.poetry.group.lint.dependencies]
-ruff = "^0.3"
 
+[tool.spin]
+package = 'numpy_financial'
 
-[tool.poetry.group.bench.dependencies]
-asv = "^0.6"
+[tool.spin.commands]
+"Build" = [
+  "spin.cmds.meson.build",
+  "spin.cmds.meson.test",
+  "spin.cmds.build.sdist",
+  "spin.cmds.pip.install",
+]
+"Documentation" = [
+  "spin.cmds.meson.docs"
+]
+"Environments" = [
+  "spin.cmds.meson.shell",
+  "spin.cmds.meson.ipython",
+  "spin.cmds.meson.python",
+  "spin.cmds.meson.run"
+]

tests/meson.build

@@ -0,0 +1,9 @@
+test_sources = [
+    '__init__.py',
+    'test_financial.py',
+]
+
+py.install_sources(
+    test_sources,
+    subdir: 'tests',
+)