Add cli for finding locations of registered func

spacy/cli/__init__.py

@@ -14,6 +14,7 @@ from .debug_diff import debug_diff  # noqa: F401
 from .debug_model import debug_model  # noqa: F401
 from .download import download  # noqa: F401
 from .evaluate import evaluate  # noqa: F401
+from .find_loc import find_loc  # noqa: F401
 from .find_threshold import find_threshold  # noqa: F401
 from .info import info  # noqa: F401
 from .init_config import fill_config, init_config  # noqa: F401

spacy/cli/find_loc.py

@@ -0,0 +1,51 @@
+from wasabi import msg
+
+from ._util import Arg, Opt, app
+
+from ..util import registry
+from catalogue import RegistryError
+
+
+@app.command("find-loc")
+def find_loc(
+    # fmt: off
+    func_name: str = Arg(..., help="Name of the registered function."),
+    registry_name: str = Opt(None, help="Name of the catalogue registry."),
+    # fmt: on
+):
+    """
+    Find the module, path and line number to the file the registered
+    function is defined in, if available.
+
+    func_name (str): Name of the registered function.
+    registry_name (str): Name of the catalogue registry.
+    """
+    registry_names = registry.get_registry_names()
+    for name in registry_names:
+        if registry.has(name, func_name):
+            registry_name = name
+            break
+
+    find_loc(func_name, registry_name)
+
+
+def find_loc(registry_func, registry_name):
+    try:
+        registry_desc = registry.find(registry_name, registry_func)
+
+    except RegistryError as e:
+        msg.fail(
+            f"Couldn't find registered function: {registry_func}\n\n{e}",
+            exits=1,
+        )
+
+    if registry_desc["file"]:
+        registry_path = registry_desc["file"]
+        line_no = registry_desc["line_no"]
+    else:
+        msg.fail(
+            f"Couldn't find path to registered function: {registry_func}",
+            exits=1,
+        )
+
+    msg.good(f"Found registered function at file://{registry_path}:{line_no}")