build: Move build config to pyproject.toml

A warning says:

    .../setuptools/config/pyprojecttoml.py:72: _ExperimentalConfiguration: `[tool.setuptools.ext-modules]` in `pyproject.toml` is still *experimental* and likely to change in future releases.

Let's be adventurous! :)

Author: dbaty

.readthedocs.yaml

@@ -4,6 +4,8 @@ build:
   os: ubuntu-24.04
   tools:
     python: "3.14"
+  apt_packages:
+    - libzbar-dev
 
 sphinx:
   configuration: docs/conf.py

pyproject.toml

@@ -92,3 +92,11 @@ disable = [
     "unused-argument",
     "wrong-import-order",
 ]
+
+
+[[tool.setuptools.ext-modules]]
+name = "zbarlight._zbarlight"
+sources = ["src/zbarlight/_zbarlight.c"]
+extra-compile-args = ["-std=c99"]
+libraries= ["zbar"]
+# optional = FIXME: we don't want to build on ReadTheDocs

setup.py

@@ -1,22 +1,4 @@
 #!/usr/bin/env python
-import os
-
-from setuptools import Extension
 from setuptools import setup
 
-setup(
-    package_dir={  # FIXME: wait for https://github.com/pypa/setuptools/issues/1136
-        "": "src",
-    },
-    ext_modules=[
-        Extension(
-            name=str("zbarlight._zbarlight"),
-            sources=[str("src/zbarlight/_zbarlight.c")],
-            extra_compile_args=["-std=c99"],
-            libraries=["zbar"],
-            optional=os.environ.get(
-                "READTHEDOCS", False
-            ),  # Do not build on Read the Docs
-        ),
-    ],
-)
+setup()