Fix issue with pytask --version and click v8.

docs/changes.rst

@@ -7,7 +7,14 @@ all releases are available on `PyPI <https://pypi.org/project/pytask>`_ and
 `Anaconda.org <https://anaconda.org/conda-forge/pytask>`_.
 
 
-0.0.15 - 2021-xx-xx
+0.0.16 - 2021-xx-xx
+-------------------
+
+- :gh:`111` fixes error when using ``pytask --version`` with click v8.
+
+
+
+0.0.15 - 2021-06-24
 -------------------
 
 - :gh:`80` replaces some remaining formatting using ``pprint`` with ``rich``.

src/_pytask/cli.py

@@ -5,9 +5,15 @@
 from _pytask.config import hookimpl
 from _pytask.pluginmanager import get_plugin_manager
 from click_default_group import DefaultGroup
+from pkg_resources import packaging
 
 
-CONTEXT_SETTINGS = {"help_option_names": ["-h", "--help"]}
+_CONTEXT_SETTINGS = {"help_option_names": ["-h", "--help"]}
+
+if packaging.version.parse(click.__version__) < packaging.version.parse("8"):
+    _VERSION_OPTION_KWARGS = {}
+else:
+    _VERSION_OPTION_KWARGS = {"package_name": "pytask"}
 
 
 def _extend_command_line_interface(command_line_interface):
@@ -78,11 +84,11 @@ def pytask_add_hooks(pm):
 
 @click.group(
     cls=DefaultGroup,
-    context_settings=CONTEXT_SETTINGS,
+    context_settings=_CONTEXT_SETTINGS,
     default="build",
     default_if_no_args=True,
 )
-@click.version_option()
+@click.version_option(**_VERSION_OPTION_KWARGS)
 def cli():
     """The command line interface of pytask."""
     pass

tests/test_cli.py

@@ -0,0 +1,8 @@
+import subprocess
+
+from pytask import __version__
+
+
+def test_version_option():
+    process = subprocess.run(["pytask", "--version"], capture_output=True)
+    assert "pytask, version " + __version__ in process.stdout.decode("utf-8")