def _repl_env_var()

in core/shelllib.py [0:0]

• 8 lines of code
• 4 McCabe index (conditional complexity)

def _repl_env_var(match):
    varname = match.group(1)
    value = os.getenv(varname, None)
    if value is None:
        value = match.group(3) or ""
    if varname in value:
        raise ShellExpansionError(f"Environment variable is recursively defined: {varname}")
    return _shell_expand_str(value)