Add support for showing all overload signatures for a function.

Author: daemontus

pdoc/doc.py

@@ -39,6 +39,18 @@
 from typing import TypeVar
 from typing import Union
 from typing import get_origin
+
+try:
+    # This only exists on Python 3.11 and later. On older versions,
+    # we just replace it with a function that does nothing.
+    from typing import get_overloads
+except ImportError:
+    from typing import Sequence
+
+    def get_overloads(func: Callable[..., object]) -> Sequence[Callable[..., object]]:
+        return []
+
+
 import warnings
 
 from pdoc import doc_ast
@@ -989,6 +1001,69 @@ def signature(self) -> inspect.Signature:
             return inspect.Signature(
                 [inspect.Parameter("unknown", inspect.Parameter.POSITIONAL_OR_KEYWORD)]
             )
+
+        return self._process_signature(sig)
+
+    @cached_property
+    def signature_without_self(self) -> inspect.Signature:
+        """Like `signature`, but without the first argument.
+
+        This is useful to display constructors.
+        """
+        return self.signature.replace(
+            parameters=list(self.signature.parameters.values())[1:]
+        )
+
+    @cached_property
+    def overloads(self) -> list[inspect.Signature]:
+        """
+        The function's overloaded signatures, if any.
+
+        This should do the same processing as `signature`, but can return a list
+        of additional signatures when available.
+        """
+
+        if self.obj is object.__init__:
+            # See `signature`.
+            return [inspect.Signature()]
+
+        try:
+            values = get_overloads(self.obj)
+        except Exception:
+            return []
+
+        results = []
+        for value in values:
+            try:
+                sig = _PrettySignature.from_callable(value)
+                results.append(self._process_signature(sig))
+            except Exception:
+                sig_err = inspect.Signature(
+                    [
+                        inspect.Parameter(
+                            "unknown", inspect.Parameter.POSITIONAL_OR_KEYWORD
+                        )
+                    ]
+                )
+                results.append(sig_err)
+        return results
+
+    @cached_property
+    def overloads_without_self(self) -> list[inspect.Signature]:
+        """Like `overloads`, but without the first argument.
+
+        This is useful to display constructors.
+        """
+        return [
+            sig.replace(parameters=list(self.signature.parameters.values())[1:])
+            for sig in self.overloads
+        ]
+
+    def _process_signature(self, sig: inspect.Signature) -> inspect.Signature:
+        """
+        A helper method for `signature` and `overloads` which performs
+        necessary post-processing on a signature object.
+        """
         mod = inspect.getmodule(self.obj)
         globalns = _safe_getattr(mod, "__dict__", {})
         localns = globalns
@@ -1012,16 +1087,6 @@ def signature(self) -> inspect.Signature:
             )
         return sig
 
-    @cached_property
-    def signature_without_self(self) -> inspect.Signature:
-        """Like `signature`, but without the first argument.
-
-        This is useful to display constructors.
-        """
-        return self.signature.replace(
-            parameters=list(self.signature.parameters.values())[1:]
-        )
-
 
 class Variable(Doc[None]):
     """

pdoc/doc_pyi.py

@@ -77,6 +77,7 @@ def _patch_doc(target_doc: doc.Doc, stub_mod: doc.Module) -> None:
             stub_doc.docstring = ""
 
         target_doc.signature = stub_doc.signature
+        target_doc.overloads = stub_doc.overloads
         target_doc.funcdef = stub_doc.funcdef
         target_doc.docstring = stub_doc.docstring or target_doc.docstring
     elif isinstance(target_doc, doc.Variable) and isinstance(stub_doc, doc.Variable):

pdoc/templates/content.css

@@ -300,6 +300,19 @@ This makes sure that the pdoc styling doesn't leak to the rest of the page when
     overflow-x: auto;
 }
 
+.pdoc .overloads {
+    margin-left: 2rem;
+}
+
+/*  The same as .pdoc .attr, but without the focused/target/hover rules. */
+.pdoc .extra-attr {
+    display: block;
+    margin: .5rem 0 .5rem;
+    padding: .4rem .4rem .4rem 1rem;
+    background-color: var(--accent);
+    overflow-x: auto;
+}
+
 .pdoc .classattr {
     margin-left: 2rem;
 }

pdoc/templates/default/module.html.jinja2

@@ -172,10 +172,30 @@ See https://pdoc.dev/docs/pdoc/render_helpers.html#DefaultMacroExtension for an
         {{- fn.signature_without_self | format_signature(colon=False) | linkify }}
     {% else %}
         <span class="def">{{ fn.funcdef }}</span>
-        <span class="name">{{ fn.name }}</span>
-        {{- fn.signature | format_signature(colon=True) | linkify }}
+        <span class="name">{{ fn.name }}</span>        
+        {{- fn.signature | format_signature(colon=True) | linkify }}        
     {% endif %}
 {% enddefaultmacro %}
+{% defaultmacro overloads(fn) -%}
+    <div class="overloads">            
+        {% if fn.name == "__init__" %}
+            {% for sig in fn.overloads_without_self %}
+                <div class="extra-attr {{ fn.kind }}">
+                    <span class="name">{{ ".".join(fn.qualname.split(".")[:-1]) }}</span>
+                    {{- sig | format_signature(colon=False) | linkify }}
+                </div>
+            {% endfor %}
+        {% else %}
+            {% for sig in fn.overloads %}                        
+                <div class="extra-attr {{ fn.kind }}">
+                    <span class="def">{{ fn.funcdef }}</span>
+                    <span class="name">{{ fn.name }}</span>        
+                    {{- sig | format_signature(colon=True) | linkify }}
+                </div>
+            {% endfor %}    
+        {% endif %}
+    </div>
+{% enddefaultmacro %}
 {% defaultmacro variable(var) -%}
     {%- if var.is_type_alias_type %}<span class="def">type</span> {% endif -%}
     <span class="name">{{ var.name }}</span>{{ annotation(var) }}{{ default_value(var) }}
@@ -203,6 +223,9 @@ See https://pdoc.dev/docs/pdoc/render_helpers.html#DefaultMacroExtension for an
         {% endif %}
         {{ view_source_button(doc) }}
     </div>
+    {% if doc.kind == "function" and doc.overloads|length > 0 %}
+        {{ overloads(doc) }}
+    {% endif %}
     <a class="headerlink" href="#{{ doc.qualname or doc.name }}"></a>
     {{ view_source_code(doc) }}
     {{ docstring(doc) }}