Handle spacy-legacy in package CLI for dependencies (#9163)

* Handle spacy-legacy in package CLI for dependencies

* Implement legacy backoff in spacy registry.find

* Remove unused import

* Update and format test

spacy/cli/package.py

@@ -200,7 +200,7 @@ def get_third_party_dependencies(
     exclude (list): List of packages to exclude (e.g. that already exist in meta).
     RETURNS (list): The versioned requirements.
     """
-    own_packages = ("spacy", "spacy-nightly", "thinc", "srsly")
+    own_packages = ("spacy", "spacy-legacy", "spacy-nightly", "thinc", "srsly")
     distributions = util.packages_distributions()
     funcs = defaultdict(set)
     for path, value in util.walk_dict(config):
@@ -211,9 +211,8 @@ def get_third_party_dependencies(
             funcs["factories"].add(component["factory"])
     modules = set()
     for reg_name, func_names in funcs.items():
-        sub_registry = getattr(util.registry, reg_name)
         for func_name in func_names:
-            func_info = sub_registry.find(func_name)
+            func_info = util.registry.find(reg_name, func_name)
             module_name = func_info.get("module")
             if module_name:  # the code is part of a module, not a --code file
                 modules.add(func_info["module"].split(".")[0])

spacy/tests/test_cli.py

@@ -536,7 +536,7 @@ def test_init_labels(component_name):
         assert len(nlp2.get_pipe(component_name).labels) == 4
 
 
-def test_get_third_party_dependencies_runs():
+def test_get_third_party_dependencies():
     # We can't easily test the detection of third-party packages here, but we
     # can at least make sure that the function and its importlib magic runs.
     nlp = Dutch()
@@ -544,6 +544,22 @@ def test_get_third_party_dependencies_runs():
     nlp.add_pipe("tagger")
     assert get_third_party_dependencies(nlp.config) == []
 
+    # Test with legacy function
+    nlp = Dutch()
+    nlp.add_pipe(
+        "textcat",
+        config={
+            "model": {
+                # Do not update from legacy architecture spacy.TextCatBOW.v1
+                "@architectures": "spacy.TextCatBOW.v1",
+                "exclusive_classes": True,
+                "ngram_size": 1,
+                "no_output_layer": False,
+            }
+        },
+    )
+    get_third_party_dependencies(nlp.config) == []
+
 
 @pytest.mark.parametrize(
     "parent,child,expected",

spacy/util.py

@@ -140,6 +140,32 @@ class registry(thinc.registry):
             ) from None
         return func
 
+    @classmethod
+    def find(cls, registry_name: str, func_name: str) -> Callable:
+        """Get info about a registered function from the registry."""
+        # We're overwriting this classmethod so we're able to provide more
+        # specific error messages and implement a fallback to spacy-legacy.
+        if not hasattr(cls, registry_name):
+            names = ", ".join(cls.get_registry_names()) or "none"
+            raise RegistryError(Errors.E892.format(name=registry_name, available=names))
+        reg = getattr(cls, registry_name)
+        try:
+            func_info = reg.find(func_name)
+        except RegistryError:
+            if func_name.startswith("spacy."):
+                legacy_name = func_name.replace("spacy.", "spacy-legacy.")
+                try:
+                    return reg.find(legacy_name)
+                except catalogue.RegistryError:
+                    pass
+            available = ", ".join(sorted(reg.get_all().keys())) or "none"
+            raise RegistryError(
+                Errors.E893.format(
+                    name=func_name, reg_name=registry_name, available=available
+                )
+            ) from None
+        return func_info
+
     @classmethod
     def has(cls, registry_name: str, func_name: str) -> bool:
         """Check whether a function is available in a registry."""