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docs/configuring.md

@@ -902,7 +902,7 @@ Each pattern can be templated using Jinja.
 
     ```yaml
     _exclude:
-        - '{%- if _operation == "update" -%}src/*_example.py{%- endif %}'
+        - "{%- if _operation == 'update' -%}src/*_example.py{%- endif %}"
     ```
 
 !!! info

tests/test_context.py

@@ -1,4 +1,4 @@
-import json
+from pathlib import Path
 
 import pytest
 from plumbum import local
@@ -8,87 +8,90 @@
 from .helpers import build_file_tree, git_save
 
 
-def test_exclude_templating_with_operation(tmp_path_factory: pytest.TempPathFactory) -> None:
+def test_exclude_templating_with_operation(
+    tmp_path_factory: pytest.TempPathFactory,
+) -> None:
     """
     Ensure it's possible to create one-off boilerplate files that are not
-    managed during updates via _exclude using the ``_operation`` context variable.
+    managed during updates via `_exclude` using the `_operation` context variable.
     """
     src, dst, dst2 = map(tmp_path_factory.mktemp, ("src", "dst", "dst2"))
 
-    template = r"{%- if _operation == 'update' %}boilerplate{%- endif %}"
+    template = r"{%- if _operation == 'update' %}copy-only{%- endif %}"
     with local.cwd(src):
         build_file_tree(
             {
-                "copier.yml": f"_exclude:\n - \"{template}\"",
+                "copier.yml": f'_exclude:\n - "{template}"',
                 "{{ _copier_conf.answers_file }}.jinja": "{{ _copier_answers|to_yaml }}",
-                "boilerplate": "foo",
-                "other_file": "foo",
+                "copy-only": "foo",
+                "copy-and-update": "foo",
             }
         )
         git_save(tag="1.0.0")
         build_file_tree(
             {
-                "boilerplate": "bar",
-                "other_file": "bar",
+                "copy-only": "bar",
+                "copy-and-update": "bar",
             }
         )
         git_save(tag="2.0.0")
-    boilerplate = dst / "boilerplate"
-    other_file = dst / "other_file"
+    copy_only = dst / "copy-only"
+    copy_and_update = dst / "copy-and-update"
 
     copier.run_copy(str(src), dst, defaults=True, overwrite=True, vcs_ref="1.0.0")
-    for file in (boilerplate, other_file):
+    for file in (copy_only, copy_and_update):
         assert file.exists()
         assert file.read_text() == "foo"
 
     with local.cwd(dst):
         git_save()
 
     copier.run_update(str(dst), overwrite=True)
-    assert boilerplate.read_text() == "foo"  # This file is excluded from updates
-    assert other_file.read_text() == "bar"
+    assert copy_only.read_text() == "foo"
+    assert copy_and_update.read_text() == "bar"
 
     # After using the worker for an `update` operation, reuse it for a `copy` again.
     # This checks that the cached `match_exclude` property is regenerated
     # after a context switch back from update to copy.
     copier.run_copy(str(src), dst2, defaults=True, overwrite=True, vcs_ref="1.0.0")
-    for filename in ("boilerplate", "other_file"):
+    for filename in ("copy-only", "copy-and-update"):
         assert (dst2 / filename).exists()
         assert (dst2 / filename).read_text() == "foo"
 
 
 def test_task_templating_with_operation(
-    tmp_path_factory: pytest.TempPathFactory
+    tmp_path_factory: pytest.TempPathFactory, tmp_path: Path
 ) -> None:
     """
     Ensure that it is possible to define tasks that are only executed when copying.
     """
     src, dst = map(tmp_path_factory.mktemp, ("src", "dst"))
-    task = {
-        "command": ["{{ _copier_python }}", "-c", "from pathlib import Path; Path('foo').touch(exist_ok=False)"],
-        "when": "{{ _operation == 'copy'}}",
-    }
+    # Use a file outside the Copier working directories to ensure accurate tracking
+    task_counter = tmp_path / "task_calls.txt"
     with local.cwd(src):
         build_file_tree(
             {
-                "copier.yml": f"_tasks: {json.dumps([task])}",
+                "copier.yml": (
+                    f"""\
+                    _tasks:
+                        -   command: "echo {{{{ _operation }}}} >> '{task_counter}'"
+                            when: "{{{{ _operation == 'copy' }}}}"
+                    """
+                ),
                 "{{ _copier_conf.answers_file }}.jinja": "{{ _copier_answers|to_yaml }}",
             }
         )
         git_save(tag="1.0.0")
 
     copier.run_copy(str(src), dst, defaults=True, overwrite=True, unsafe=True)
-    dst_file = dst / "foo"
-    assert dst_file.exists()
+    assert task_counter.exists()
+    assert len(task_counter.read_text().splitlines()) == 1
 
-    dst_file.unlink()
     with local.cwd(dst):
         git_save()
 
     copier.run_recopy(dst, defaults=True, overwrite=True, unsafe=True)
-    assert dst_file.exists()
-
-    dst_file.unlink()
+    assert len(task_counter.read_text().splitlines()) == 2
 
     copier.run_update(dst, defaults=True, overwrite=True, unsafe=True)
-    assert not dst_file.exists()
+    assert len(task_counter.read_text().splitlines()) == 2