Support appending plugin labels to wheel names

Author: mgorny

demo-plugins/blas_plugin.py

@@ -0,0 +1,29 @@
+from variantlib.base import PluginBase
+from variantlib.config import ProviderConfig
+from variantlib.meta import VariantDescription
+
+
+class BlasPlugin(PluginBase):
+    namespace = "blas"
+
+    def get_supported_configs(self) -> ProviderConfig:
+        return None
+
+    def get_variant_labels(self, variant_desc: VariantDescription) -> list[str]:
+        for meta in variant_desc:
+            if meta.namespace == "blas" and meta.key == "variant":
+                return [meta.value]
+        return []
+
+
+class X8664Plugin(PluginBase):
+    namespace = "x86_64"
+
+    def get_supported_configs(self) -> ProviderConfig:
+        return None
+
+    def get_variant_labels(self, variant_desc: VariantDescription) -> list[str]:
+        for meta in variant_desc:
+            if meta.namespace == "x86_64" and meta.key == "baseline":
+                return [f"x86_64_{meta.value}"]
+        return []

demo-plugins/demo_plugins.py

@@ -0,0 +1,13 @@
+[build-system]
+requires = ["flit_core>=3.2,<4"]
+build-backend = "flit_core.buildapi"
+
+[project]
+name = "demo-plugins"
+version = "0"
+description = "Demo plugins for meson-python/numpy variants"
+dependencies = ["variantlib"]
+
+[project.entry-points."variantlib.plugins"]
+blas = "demo_plugins:BlasPlugin"
+x86_64 = "demo_plugins:X8664Plugin"

demo-plugins/pyproject.toml

@@ -353,16 +353,20 @@ def tag(self) -> mesonpy._tags.Tag:
             return mesonpy._tags.Tag('py3', 'none', None)
         return mesonpy._tags.Tag(None, self._stable_abi, None)
 
-    @property
-    def _variant_suffix(self) -> str:
-        if self._variant is not None:
-            return f"-{self._variant.hexdigest}"
-        return ""
-
     @property
     def name(self) -> str:
         """Wheel name, this includes the basename and tag."""
-        return f'{self._metadata.distribution_name}-{self._metadata.version}-{self.tag}{self._variant_suffix}'
+        name = f'{self._metadata.distribution_name}-{self._metadata.version}-{self.tag}'
+        if self._variant is not None:
+            name += f'-{self._variant.hexdigest}'
+            labels = PluginLoader().get_variant_labels(self._variant)
+            for numlabels in range(len(labels), 0, -1):
+                long_name = "+".join((name, *labels[:numlabels]))
+                # if labels would give us filename that's longer than 128
+                # characters (124 + .whl), strip them
+                if len(long_name) < 124:
+                    return long_name
+        return name
 
     @property
     def _distinfo_dir(self) -> str: