Add --show-traceback to control whether tracebacks are displayed.

docs/source/changes.rst

@@ -11,6 +11,8 @@ all releases are available on `PyPI <https://pypi.org/project/pytask>`_ and
 ------------------
 
 - :gh:`186` enhance live displays by deactivating auto-refresh among other things.
+- :gh:`187` allows to enable and disable showing tracebacks and potentially different
+  styles in the future with :confval:`show_traceback=True|False`.
 - :gh:`188` refactors some code related to :class:`_pytask.enums.ExitCode`.
 
 

src/_pytask/build.py

@@ -107,6 +107,11 @@ def main(config_from_cli: Dict[str, Any]) -> Session:
     default=None,
     help="Print errors with tracebacks as soon as the task fails.",
 )
+@click.option(
+    "--show-traceback",
+    type=click.Choice(["yes", "no"]),
+    help="Choose whether tracebacks should be displayed or not.  [default: yes]",
+)
 def build(**config_from_cli: Any) -> "NoReturn":
     """Collect and execute tasks and report the results.
 

src/_pytask/execute.py

@@ -228,16 +228,18 @@ def pytask_execute_log_end(session: Session, reports: List[ExecutionReport]) ->
 
     counts = count_outcomes(reports, TaskOutcome)
 
-    console.print()
-    if counts[TaskOutcome.FAIL]:
-        console.rule(
-            Text("Failures", style=TaskOutcome.FAIL.style), style=TaskOutcome.FAIL.style
-        )
+    if session.config["show_traceback"] != "no":
         console.print()
+        if counts[TaskOutcome.FAIL]:
+            console.rule(
+                Text("Failures", style=TaskOutcome.FAIL.style),
+                style=TaskOutcome.FAIL.style,
+            )
+            console.print()
 
-    for report in reports:
-        if report.outcome in (TaskOutcome.FAIL, TaskOutcome.SKIP_PREVIOUS_FAILED):
-            _print_errored_task_report(session, report)
+        for report in reports:
+            if report.outcome in (TaskOutcome.FAIL, TaskOutcome.SKIP_PREVIOUS_FAILED):
+                _print_errored_task_report(session, report)
 
     console.rule(style="dim")
 

src/_pytask/logging.py

@@ -5,6 +5,7 @@
 from typing import Any
 from typing import Dict
 from typing import List
+from typing import Optional
 from typing import Tuple
 from typing import TYPE_CHECKING
 from typing import Union
@@ -38,6 +39,13 @@ class _TimeUnit(TypedDict):
         short: str
         in_seconds: int
 
+    if sys.version_info >= (3, 8):
+        from typing import Literal
+    else:
+        from typing_extensions import Literal
+
+    _ShowTraceback = Literal["no", "yes"]
+
 
 @hookimpl
 def pytask_extend_command_line_interface(cli: click.Group) -> None:
@@ -78,6 +86,26 @@ def pytask_parse_config(
             "See https://github.com/pytask-dev/pytask/issues/171 for more information. "
             "Resort to `editor_url_scheme='file'`."
         )
+    config["show_traceback"] = get_first_non_none_value(
+        config_from_cli,
+        config_from_file,
+        key="show_traceback",
+        default="yes",
+        callback=_show_traceback_callback,
+    )
+
+
+def _show_traceback_callback(
+    x: Optional["_ShowTraceback"],
+) -> Optional["_ShowTraceback"]:
+    """Validate the passed options for showing tracebacks."""
+    if x in [None, "None", "none"]:
+        x = None
+    elif x in ["no", "yes"]:
+        pass
+    else:
+        raise ValueError("'show_traceback' can only be one of ['no', 'yes'")
+    return x
 
 
 @hookimpl

tests/test_logging.py

@@ -6,6 +6,7 @@
 from _pytask.logging import _format_plugin_names_and_versions
 from _pytask.logging import _humanize_time
 from _pytask.logging import pytask_log_session_footer
+from _pytask.outcomes import ExitCode
 from _pytask.outcomes import TaskOutcome
 from pytask import cli
 
@@ -127,3 +128,20 @@ def test_humanize_time(amount, unit, short_label, expectation, expected):
     with expectation:
         result = _humanize_time(amount, unit, short_label)
         assert result == expected
+
+
+@pytest.mark.parametrize("show_traceback", ["no", "yes"])
+def test_show_traceback(runner, tmp_path, show_traceback):
+    source = "def task_raises(): raise Exception"
+    tmp_path.joinpath("task_module.py").write_text(source)
+
+    result = runner.invoke(
+        cli, [tmp_path.as_posix(), "--show-traceback", show_traceback]
+    )
+
+    has_traceback = show_traceback == "yes"
+
+    assert result.exit_code == ExitCode.FAILED
+    assert ("Failures" in result.output) is has_traceback
+    assert ("Traceback" in result.output) is has_traceback
+    assert ("raise Exception" in result.output) is has_traceback