Add Pyreverse option to exclude standalone nodes (#8520)

* Add Pyreverse option to exclude standalone nodes

* Add test

* Add package test

* Fix test names

* Clean up test files

3 files changed, 23 insertions, 0 deletions

diff --git a/pylint/pyreverse/main.py b/pylint/pyreverse/main.py
index 975e432e4..58128bb57 100644
--- a/pylint/pyreverse/main.py
+++ b/pylint/pyreverse/main.py
@@ -158,6 +158,14 @@ OPTIONS: Options = (
         },
     ),
     (
+        "no-standalone",
+        {
+            "action": "store_true",
+            "default": False,
+            "help": "only show nodes with connections",
+        },
+    ),
+    (
         "output",
         {
             "short": "o",
diff --git a/pylint/pyreverse/writer.py b/pylint/pyreverse/writer.py
index cb711dd10..b5cab0a66 100644
--- a/pylint/pyreverse/writer.py
+++ b/pylint/pyreverse/writer.py
@@ -57,6 +57,12 @@ class DiagramWriter:
         # sorted to get predictable (hence testable) results
         for module in sorted(diagram.modules(), key=lambda x: x.title):
             module.fig_id = module.node.qname()
+            if self.config.no_standalone and not any(
+                module in (rel.from_object, rel.to_object)
+                for rel in diagram.get_relationships("depends")
+            ):
+                continue
+
             self.printer.emit_node(
                 module.fig_id,
                 type_=NodeType.PACKAGE,
@@ -75,6 +81,13 @@ class DiagramWriter:
         # sorted to get predictable (hence testable) results
         for obj in sorted(diagram.objects, key=lambda x: x.title):  # type: ignore[no-any-return]
             obj.fig_id = obj.node.qname()
+            if self.config.no_standalone and not any(
+                obj in (rel.from_object, rel.to_object)
+                for rel_type in ("specialization", "association", "aggregation")
+                for rel in diagram.get_relationships(rel_type)
+            ):
+                continue
+
             self.printer.emit_node(
                 obj.fig_id,
                 type_=NodeType.CLASS,
diff --git a/pylint/testutils/pyreverse.py b/pylint/testutils/pyreverse.py
index ba79ebf8b..24fddad77 100644
--- a/pylint/testutils/pyreverse.py
+++ b/pylint/testutils/pyreverse.py
@@ -37,6 +37,7 @@ class PyreverseConfig(
         all_ancestors: bool | None = None,
         show_associated: int | None = None,
         all_associated: bool | None = None,
+        no_standalone: bool = False,
         show_builtin: bool = False,
         show_stdlib: bool = False,
         module_names: bool | None = None,
@@ -59,6 +60,7 @@ class PyreverseConfig(
         self.all_ancestors = all_ancestors
         self.show_associated = show_associated
         self.all_associated = all_associated
+        self.no_standalone = no_standalone
         self.show_builtin = show_builtin
         self.show_stdlib = show_stdlib
         self.module_names = module_names