ENH: add install-tags filtering for wheel generation

mesonpy/__init__.py

@@ -11,6 +11,7 @@
 
 from __future__ import annotations
 
+import argparse
 import collections
 import contextlib
 import functools
@@ -921,7 +922,25 @@ def _info(self, name: str) -> Dict[str, Any]:
     @property
     def _install_plan(self) -> Dict[str, Dict[str, Dict[str, str]]]:
         """Meson install_plan metadata."""
-        return self._info('intro-install_plan').copy()
+
+        # copy the install plan so we can modify it
+        install_plan = self._info('intro-install_plan').copy()
+
+        # parse install args for install tags (--tags)
+        parser = argparse.ArgumentParser()
+        parser.add_argument('--tags')
+        args, _ = parser.parse_known_args(self._meson_args['install'])
+
+        # filter the install_plan for files that do not fit the install tags
+        if args.tags:
+            install_tags = args.tags.split(',')
+
+            for files in install_plan.values():
+                for file, details in list(files.items()):
+                    if details['tag'].strip() not in install_tags:
+                        del files[file]
+
+        return install_plan
 
     @property
     def _copy_files(self) -> Dict[str, str]:

tests/test_project.py

@@ -97,3 +97,14 @@ def last_two_meson_args():
 def test_unknown_user_args(package, tmp_path_session):
     with pytest.raises(mesonpy.ConfigError):
         mesonpy.Project(package_dir / f'unknown-user-args-{package}', tmp_path_session)
+
+
+def test_install_tags(package_purelib_and_platlib, tmp_path_session):
+    project = mesonpy.Project(
+        package_purelib_and_platlib,
+        tmp_path_session,
+        meson_args={
+            'install': ['--tags', 'purelib'],
+        }
+    )
+    assert project.is_pure