implement tox_add_option hook

tox_poetry_installer/__init__.py

@@ -1,4 +1,5 @@
 # pylint: disable=missing-docstring
 from tox_poetry_installer.hooks import tox_add_core_config
 from tox_poetry_installer.hooks import tox_add_env_config
+from tox_poetry_installer.hooks import tox_add_option
 from tox_poetry_installer.hooks import tox_on_install

tox_poetry_installer/hooks.py

@@ -7,6 +7,7 @@ themselves manageable).
 from itertools import chain
 from typing import List
 
+from tox.config.cli.parser import ToxParser
 from tox.config.sets import ConfigSet
 from tox.config.sets import EnvConfigSet
 from tox.plugin import impl
@@ -31,6 +32,25 @@ def tox_add_core_config(core_conf: ConfigSet):
     )
 
 
+@impl
+def tox_add_option(parser: ToxParser):
+    """Add additional command line arguments to tox to configure plugin behavior"""
+    parser.add_argument(
+        "--require-poetry",
+        action="store_true",
+        dest="require_poetry",
+        help="(deprecated) Trigger a failure if Poetry is not available to Tox",
+    )
+
+    parser.add_argument(
+        "--parallel-install-threads",
+        type=int,
+        dest="parallel_install_threads",
+        default=constants.DEFAULT_INSTALL_THREADS,
+        help="Number of locked dependencies to install simultaneously; set to 0 to disable parallel installation",
+    )
+
+
 @impl
 def tox_add_env_config(env_conf: EnvConfigSet):
     """Add required env configuration options to the tox INI file"""
@@ -164,10 +184,9 @@ def tox_on_install(
         raise err
 
     dependencies = utilities.dedupe_packages(group_deps + env_deps + project_deps)
-
     installer.install(
         poetry,
         tox_env,
         dependencies,
-        tox_env.core["parallel_install_threads"],
+        tox_env.options.parallel_install_threads,
     )

tox_poetry_installer/utilities.py

@@ -37,7 +37,7 @@ def check_preconditions(venv: ToxVirtualEnv) -> "_poetry.Poetry":
     if isinstance(venv, PackageToxEnv):
         raise exceptions.SkipEnvironment(f"Skipping Tox provisioning env '{venv.name}'")
 
-    if venv.conf["require_poetry"]:
+    if venv.options.require_poetry:
         logger.warning(
             "DEPRECATION: The '--require-poetry' runtime option is deprecated and will be "
             "removed in version 1.0.0. Please update test environments that require Poetry to "