dependency groups: rename implicit group "default" to "main"

This is done in order to avoid ambiguity between "default group" and "default dependencies" (the groups that are considered by a command by default)

src/poetry/core/factory.py

@@ -78,6 +78,8 @@ def _add_package_group_dependencies(
         group: str | DependencyGroup,
         dependencies: DependencyConfig,
     ) -> None:
+        from poetry.core.packages.dependency_group import MAIN_GROUP
+
         if isinstance(group, str):
             if package.has_dependency_group(group):
                 group = package.dependency_group(group)
@@ -92,7 +94,7 @@ def _add_package_group_dependencies(
             )
             for _constraint in _constraints:
                 if name.lower() == "python":
-                    if group.name == "default" and isinstance(_constraint, str):
+                    if group.name == MAIN_GROUP and isinstance(_constraint, str):
                         package.python_versions = _constraint
                     continue
 
@@ -116,6 +118,7 @@ def configure_package(
         with_groups: bool = True,
     ) -> ProjectPackage:
         from poetry.core.packages.dependency import Dependency
+        from poetry.core.packages.dependency_group import MAIN_GROUP
         from poetry.core.packages.dependency_group import DependencyGroup
         from poetry.core.spdx.helpers import license_by_id
 
@@ -151,7 +154,7 @@ def configure_package(
 
         if "dependencies" in config:
             cls._add_package_group_dependencies(
-                package=package, group="default", dependencies=config["dependencies"]
+                package=package, group=MAIN_GROUP, dependencies=config["dependencies"]
             )
 
         if with_groups and "group" in config:
@@ -229,6 +232,7 @@ def create_dependency(
             parse_constraint as parse_generic_constraint,
         )
         from poetry.core.packages.dependency import Dependency
+        from poetry.core.packages.dependency_group import MAIN_GROUP
         from poetry.core.packages.directory_dependency import DirectoryDependency
         from poetry.core.packages.file_dependency import FileDependency
         from poetry.core.packages.url_dependency import URLDependency
@@ -239,7 +243,7 @@ def create_dependency(
         from poetry.core.version.markers import parse_marker
 
         if groups is None:
-            groups = ["default"]
+            groups = [MAIN_GROUP]
 
         if constraint is None:
             constraint = "*"

src/poetry/core/packages/dependency.py

@@ -12,6 +12,7 @@
 from poetry.core.packages.constraints import (
     parse_constraint as parse_generic_constraint,
 )
+from poetry.core.packages.dependency_group import MAIN_GROUP
 from poetry.core.packages.specification import PackageSpecification
 from poetry.core.semver.helpers import parse_constraint
 from poetry.core.semver.version_range_constraint import VersionRangeConstraint
@@ -62,7 +63,7 @@ def __init__(
         self._optional = optional
 
         if not groups:
-            groups = ["default"]
+            groups = [MAIN_GROUP]
 
         self._groups = frozenset(groups)
 

src/poetry/core/packages/dependency_group.py

@@ -7,6 +7,9 @@
     from poetry.core.packages.types import DependencyTypes
 
 
+MAIN_GROUP = "main"
+
+
 class DependencyGroup:
     def __init__(self, name: str, optional: bool = False) -> None:
         self._name: str = name

src/poetry/core/packages/package.py

@@ -9,6 +9,7 @@
 from typing import Collection
 from typing import Iterable
 
+from poetry.core.packages.dependency_group import MAIN_GROUP
 from poetry.core.packages.specification import PackageSpecification
 from poetry.core.packages.utils.utils import create_nested_marker
 from poetry.core.semver.helpers import parse_constraint
@@ -185,19 +186,19 @@ def maintainer_email(self) -> str:
     @property
     def requires(self) -> list[DependencyTypes]:
         """
-        Returns the default dependencies
+        Returns the main dependencies
         """
-        if not self._dependency_groups or "default" not in self._dependency_groups:
+        if not self._dependency_groups or MAIN_GROUP not in self._dependency_groups:
             return []
 
-        return self._dependency_groups["default"].dependencies
+        return self._dependency_groups[MAIN_GROUP].dependencies
 
     @property
     def all_requires(
         self,
     ) -> list[DependencyTypes]:
         """
-        Returns the default dependencies and group dependencies.
+        Returns the main dependencies and group dependencies.
         """
         return [
             dependency

tests/fixtures/project_with_groups_and_explicit_default/pyproject.toml → tests/fixtures/project_with_groups_and_explicit_main/pyproject.toml

@@ -7,7 +7,7 @@ authors = ["Your Name <you@example.com>"]
 [tool.poetry.dependencies]
 python = "^3.7"
 
-[tool.poetry.group.default.dependencies]
+[tool.poetry.group.main.dependencies]
 aiohttp = "^2.17.0"
 
 [tools.poetry]

tests/packages/test_package.py

@@ -51,7 +51,7 @@ def test_package_authors_invalid():
     )
 
 
-@pytest.mark.parametrize("groups", [["default"], ["dev"]])
+@pytest.mark.parametrize("groups", [["main"], ["dev"]])
 def test_package_add_dependency_vcs_groups(groups: list[str], f: Factory):
     package = Package("foo", "0.1.0")
 
@@ -73,10 +73,10 @@ def test_package_add_dependency_vcs_groups_default_main(f: Factory):
             "poetry", {"git": "https://github.com/python-poetry/poetry.git"}
         )
     )
-    assert dependency.groups == frozenset(["default"])
+    assert dependency.groups == frozenset(["main"])
 
 
-@pytest.mark.parametrize("groups", [["default"], ["dev"]])
+@pytest.mark.parametrize("groups", [["main"], ["dev"]])
 @pytest.mark.parametrize("optional", [True, False])
 def test_package_url_groups_optional(groups: list[str], optional: bool, f: Factory):
     package = Package("foo", "0.1.0")
@@ -405,7 +405,7 @@ def test_only_with_dependency_groups(package_with_groups: Package):
     assert len(package.requires) == 0
     assert len(package.all_requires) == 2
 
-    package = package_with_groups.with_dependency_groups(["default"], only=True)
+    package = package_with_groups.with_dependency_groups(["main"], only=True)
 
     assert len(package.requires) == 2
     assert len(package.all_requires) == 2

tests/test_factory.py

@@ -249,9 +249,9 @@ def test_create_poetry_with_groups_and_legacy_dev():
     assert {dependency.name for dependency in dependencies} == {"pytest", "pre-commit"}
 
 
-def test_create_poetry_with_groups_and_explicit_default():
+def test_create_poetry_with_groups_and_explicit_main():
     poetry = Factory().create_poetry(
-        fixtures_dir / "project_with_groups_and_explicit_default"
+        fixtures_dir / "project_with_groups_and_explicit_main"
     )
 
     package = poetry.package