use PEP621 metadata to define license file to copy to wheel

turns out maturin does support copying the LICENSE file to the wheel.
The full text is embedded in the wheel's METADATA file.

build.py

@@ -6,7 +6,6 @@
 import subprocess
 import sys
 from pathlib import Path
-from wheeltools import InWheel
 
 
 root_dir = Path(__file__).parent.resolve()
@@ -38,18 +37,10 @@ def main():
     except (IndexError, KeyError):
         sys.exit("usage: build.py [sdist|wheel]")
 
-    subprocess.run(
-        cmd + ["-o", str(dist_dir)] + sys.argv[2:], check=True, cwd=str(crate_dir)
+    return subprocess.call(
+        cmd + ["-o", str(dist_dir)] + sys.argv[2:], cwd=str(crate_dir)
     )
 
-    # maturin doesn't add the license text to the wheel archive yet so we
-    # have to do it ourselves: cf. https://github.com/PyO3/maturin/issues/829
-    for wheel_file in dist_dir.glob("pngquant*.whl"):
-        with InWheel(in_wheel=str(wheel_file), out_wheel=str(wheel_file)) as tmpdir:
-            distinfo = next(Path(tmpdir).glob("*.dist-info"))
-            assert distinfo.is_dir()
-            shutil.copyfile(crate_dir / "COPYRIGHT", distinfo / "LICENSE")
-
 
 if __name__ == "__main__":
     sys.exit(main())

pyproject.toml

@@ -13,9 +13,10 @@ bindings = "bin"
 [project]
 name = "pngquant-cli"
 # by default, use the same 'version' as Cargo.toml, but can override if needed
-version = "2.17.0.post1"
+version = "2.17.0.post2"
 description = "Precompiled binaries for pngquant, the lossy PNG compressor based on libimagequant."
 maintainers = [{name = "Cosimo Lupo", email = "cosimo@anthrotype.com"}]
+license = {file = "COPYRIGHT"}
 
 [project.urls]
 repository = "https://github.com/anthrotype/pngquant-wheels"

requirements.txt

@@ -2,4 +2,3 @@ maturin
 tomli
 tomli-w
 twine
-wheeltools