Handle circular dependency on root package (fix python-poetry#118)

src/poetry_plugin_export/exporter.py

@@ -101,6 +101,7 @@ def _export_generic_txt(
         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,
         ):

src/poetry_plugin_export/walker.py

@@ -52,6 +52,7 @@ 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[NormalizedName] | None = None,
 ) -> Iterator[DependencyPackage]:
@@ -103,13 +104,15 @@ 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)
 
 
 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.
@@ -129,6 +132,7 @@ 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()
@@ -137,6 +141,7 @@ 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] = {}
 
@@ -145,6 +150,8 @@ 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(