Add _copier_conf.operation variable

copier/main.py

@@ -60,6 +60,9 @@
 _T = TypeVar("_T")
 
 
+Operation = Literal["copy", "recopy", "update"]
+
+
 @dataclass(config=ConfigDict(extra="forbid"))
 class Worker:
     """Copier process state manager.
@@ -195,6 +198,7 @@ class Worker:
     unsafe: bool = False
     skip_answered: bool = False
     skip_tasks: bool = False
+    operation: Operation = "copy"
 
     answers: AnswersMap = field(default_factory=AnswersMap, init=False)
     _cleanup_hooks: list[Callable[[], None]] = field(default_factory=list, init=False)
@@ -234,7 +238,7 @@ def _cleanup(self) -> None:
         for method in self._cleanup_hooks:
             method()
 
-    def _check_unsafe(self, mode: Literal["copy", "update"]) -> None:
+    def _check_unsafe(self, mode: Operation) -> None:
         """Check whether a template uses unsafe features."""
         if self.unsafe:
             return
@@ -846,7 +850,7 @@ def run_recopy(self) -> None:
                 "Cannot recopy because cannot obtain old template references "
                 f"from `{self.subproject.answers_relpath}`."
             )
-        with replace(self, src_path=self.subproject.template.url) as new_worker:
+        with replace(self, src_path=self.subproject.template.url, operation="recopy") as new_worker:
             new_worker.run_copy()
 
     def run_update(self) -> None:
@@ -896,8 +900,10 @@ def run_update(self) -> None:
             print(
                 f"Updating to template version {self.template.version}", file=sys.stderr
             )
-        self._apply_update()
-        self._print_message(self.template.message_after_update)
+        with replace(self, operation="update") as worker:
+            worker._apply_update()
+            worker._print_message(worker.template.message_after_update)
+            self.answers = worker.answers
 
     def _apply_update(self) -> None:  # noqa: C901
         git = get_git()

tests/conftest.py

@@ -12,6 +12,10 @@
 
 from .helpers import Spawn
 
+pytest_plugins = [
+    "tests.templates",
+]
+
 
 @pytest.fixture
 def spawn() -> Spawn:

tests/templates.py

@@ -0,0 +1,37 @@
+import shutil
+from pathlib import Path
+from typing import Generator
+
+import pytest
+
+from .helpers import build_file_tree, git_save
+
+
+@pytest.fixture(params=("copy", "recopy", "update"))
+def operation_context_template(tmp_path_factory: pytest.TempPathFactory, request: pytest.FixtureRequest) -> Generator[Path, None, None]:
+    src = tmp_path_factory.mktemp(f"operation_template_{request.param}")
+    try:
+        build_file_tree(
+            {
+                (src / f"{{% if _copier_conf.operation == '{request.param}' %}}foo{{% endif %}}"): "foo",
+                (src / "bar"): "bar",
+                (src / "{{ _copier_conf.answers_file }}.jinja"): "{{ _copier_answers|to_nice_yaml }}",
+            }
+        )
+        git_save(src, tag="1.0.0")
+        yield src
+    finally:
+        shutil.rmtree(src, ignore_errors=True)
+
+
+@pytest.fixture
+def operation_context_template_v2(operation_context_template: Path) -> Path:
+    conditional_file = next(iter(operation_context_template.glob("*foo*")))
+    build_file_tree(
+        {
+            conditional_file: "foo_update",
+            (operation_context_template / "bar"): "bar_update",
+        }
+    )
+    git_save(operation_context_template, tag="2.0.0")
+    return operation_context_template

tests/test_copy.py

@@ -945,3 +945,13 @@ def test_multiselect_choices_preserve_order(
     )
     copier.run_copy(str(src), dst, data={"q": ["three", "one", "two"]})
     assert yaml.safe_load((dst / "q.yml").read_text()) == ["one", "two", "three"]
+
+
+def test_operation_context(tmp_path: Path, operation_context_template: Path) -> None:
+    run_copy(str(operation_context_template), tmp_path)
+    conditional_file = tmp_path / "foo"
+    expected = "_copy" in operation_context_template.name
+    assert conditional_file.exists() is expected
+    if expected:
+        assert conditional_file.read_text() == "foo"
+    assert (tmp_path / "bar").read_text() == "bar"

tests/test_recopy.py

@@ -72,3 +72,23 @@ def test_recopy_works_without_replay(tpl: str, tmp_path: Path) -> None:
     # Recopy
     run_recopy(tmp_path, skip_answered=True, overwrite=True)
     assert (tmp_path / "name.txt").read_text() == "This is my name: Mario."
+
+
+def test_operation_context(tmp_path: Path, operation_context_template: Path) -> None:
+    run_copy(str(operation_context_template), tmp_path)
+    git_save(tmp_path)
+    conditional_file = tmp_path / "foo"
+    expected_copy = "_copy" in operation_context_template.name
+    expected_recopy = "recopy" in operation_context_template.name
+    assert conditional_file.exists() is expected_copy
+    assert (tmp_path / "bar").read_text() == "bar"
+    if expected_copy:
+        assert conditional_file.read_text() == "foo"
+        conditional_file.unlink()
+    (tmp_path / "bar").write_text("baz")
+    git_save(tmp_path)
+    run_recopy(str(tmp_path), overwrite=True)
+    assert conditional_file.exists() is expected_recopy
+    if expected_recopy:
+        assert conditional_file.read_text() == "foo"
+    assert (tmp_path / "bar").read_text() == "bar"

tests/test_updatediff.py

@@ -25,6 +25,7 @@
     build_file_tree,
     git,
     git_init,
+    git_save,
 )
 
 
@@ -1290,3 +1291,24 @@ def test_update_with_new_file_in_template_and_project_via_migration(
         >>>>>>> after updating
         """
     )
+
+
+def test_operation_context(tmp_path: Path, operation_context_template: Path, request: pytest.FixtureRequest) -> None:
+    run_copy(str(operation_context_template), tmp_path)
+    conditional_file = tmp_path / "foo"
+    expected_copy = "_copy" in operation_context_template.name
+    expected_update = "update" in operation_context_template.name
+    assert conditional_file.exists() is expected_copy
+    assert (tmp_path / "bar").read_text() == "bar"
+    if expected_copy:
+        assert conditional_file.read_text() == "foo"
+    git_save(tmp_path)
+    request.getfixturevalue("operation_context_template_v2")
+    run_update(str(tmp_path), overwrite=True)
+    if expected_update:
+        assert conditional_file.read_text() == "foo_update"
+    elif expected_copy:
+        assert conditional_file.read_text() == "foo"
+    else:
+        assert not conditional_file.exists()
+    assert (tmp_path / "bar").read_text() == "bar_update"