Source code for capytaine.ui.env_vars

# Copyright 2026 Capytaine developers
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import os




[docs]
def look_for_boolean_var(var_name, default):
    """Return the value of the environment variable, else default."""
    if var_name in os.environ:
        env_var = os.environ[var_name].lower()
        if env_var in {'true', '1', 't'}:
            return True
        elif env_var in {'false', '0', 'f'}:
            return False
        else:
            raise ValueError("Invalid value '{}' for the environment variable {}.".format(os.environ[var_name], var_name))
    else:
        return default