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"""
Defines a pyx_library() macros corresponding to py_library.
Uses Cython to compile .pyx files (and .py files with corresponding .pxd
files) to Python extension modules.
Example:
# Assuming Cython is mapped to "cython" in your workspace.
load("@cython//Tools:rules.bzl", "pyx_library")
pyx_library(name = 'mylib',
srcs = ['a.pyx', 'a.pxd', 'b.py', 'pkg/__init__.py', 'pkg/c.pyx'],
py_deps = ['//py_library/dep'],
data = ['//other/data'],
)
The __init__.py file must be in your srcs list so that Cython can resolve
cimports using the package layout.
"""
def pyx_library(
name,
deps=[],
srcs=[],
cython_directives=[],
cython_options=[],
**kwargs):
# First filter out files that should be run compiled vs. passed through.
py_srcs = []
pyx_srcs = []
pxd_srcs = []
for src in srcs:
if src.endswith('.pyx') or (src.endswith('.py')
and src[:-3] + '.pxd' in srcs):
pyx_srcs.append(src)
elif src.endswith('.py'):
py_srcs.append(src)
else:
pxd_srcs.append(src)
if src.endswith('__init__.py'):
# TODO(robertwb): Infer __init__.py files/package root?
pxd_srcs.append(src)
# Invoke cythonize to produce the shared object libraries.
outs = [src.split('.')[0] + '.so' for src in pyx_srcs]
extra_flags = " ".join(["-X '%s=%s'" % x for x in cython_directives] +
["-s '%s=%s'" % x for x in cython_options])
# TODO(robertwb): It might be better to only generate the C files,
# letting cc_library (or similar) handle the rest, but there isn't yet
# support compiling Python C extensions from bazel.
native.genrule(
name = name + "_cythonize",
srcs = pyx_srcs,
outs = outs,
cmd = "PYTHONHASHSEED=0 $(location @cython//:cythonize) -k -i %s $(SRCS)" % extra_flags
# Rename outputs to expected location.
# TODO(robertwb): Add an option to cythonize itself to do this.
+ """ && python -c 'import os, sys; n = len(sys.argv); [os.rename(src.split(".")[0] + ".so", dst) for src, dst in zip(sys.argv[1:], sys.argv[1+n//2:])]' $(SRCS) $(OUTS)""",
tools = ["@cython//:cythonize"] + pxd_srcs,
)
# Now create a py_library with these shared objects as data.
native.py_library(
name=name,
srcs=py_srcs,
deps=deps,
data=outs + pyx_srcs + pxd_srcs,
**kwargs
)