From 2a87128b5afc01a8287d6ff80451479fd3edc8ee Mon Sep 17 00:00:00 2001
From: Brecht Machiels <brecht@mos6581.org>
Date: Fri, 16 Sep 2022 22:01:15 +0200
Subject: [PATCH] Handle circular dependency on root package (fix #118)

---
 src/poetry_plugin_export/exporter.py | 1 +
 src/poetry_plugin_export/walker.py   | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/src/poetry_plugin_export/exporter.py b/src/poetry_plugin_export/exporter.py
index cacb439..e04e73f 100644
--- a/src/poetry_plugin_export/exporter.py
+++ b/src/poetry_plugin_export/exporter.py
@@ -85,6 +85,7 @@ def _export_requirements_txt(self, cwd: Path, output: IO | str) -> None:
         for dependency_package in get_project_dependency_packages(
             self._poetry.locker,
             project_requires=root.all_requires,
+            root_package_name=root.name,
             project_python_marker=root.python_marker,
             extras=self._extras,
         ):
diff --git a/src/poetry_plugin_export/walker.py b/src/poetry_plugin_export/walker.py
index f2ab977..bcd528d 100644
--- a/src/poetry_plugin_export/walker.py
+++ b/src/poetry_plugin_export/walker.py
@@ -50,6 +50,7 @@ def get_python_version_region_markers(packages: list[Package]) -> list[BaseMarke
 def get_project_dependency_packages(
     locker: Locker,
     project_requires: list[Dependency],
+    root_package_name: str,
     project_python_marker: BaseMarker | None = None,
     extras: bool | Sequence[str] | None = None,
 ) -> Iterator[DependencyPackage]:
@@ -95,6 +96,7 @@ def get_project_dependency_packages(
     for package, dependency in get_project_dependencies(
         project_requires=selected,
         locked_packages=repository.packages,
+        root_package_name=root_package_name,
     ):
         yield DependencyPackage(dependency=dependency, package=package)
 
@@ -102,6 +104,7 @@ def get_project_dependency_packages(
 def get_project_dependencies(
     project_requires: list[Dependency],
     locked_packages: list[Package],
+    root_package_name: str,
 ) -> Iterable[tuple[Package, Dependency]]:
     # group packages entries by name, this is required because requirement might use
     # different constraints.
@@ -121,6 +124,7 @@ def get_project_dependencies(
     nested_dependencies = walk_dependencies(
         dependencies=project_requires,
         packages_by_name=packages_by_name,
+        root_package_name=root_package_name,
     )
 
     return nested_dependencies.items()
@@ -129,6 +133,7 @@ def get_project_dependencies(
 def walk_dependencies(
     dependencies: list[Dependency],
     packages_by_name: dict[str, list[Package]],
+    root_package_name: str,
 ) -> dict[Package, Dependency]:
     nested_dependencies: dict[Package, Dependency] = {}
 
@@ -137,6 +142,8 @@ def walk_dependencies(
         requirement = dependencies.pop(0)
         if (requirement, requirement.marker) in visited:
             continue
+        if requirement.name == root_package_name:
+            continue
         visited.add((requirement, requirement.marker))
 
         locked_package = get_locked_package(