INNER CODE UNIT · Python

expandvars

piku/piku · piku.py:318

def expandvars(buffer, env, default=None, skip_escaped=False):
    """expand shell-style environment variables in a buffer"""

    def replace_var(match):
        return env.get(match.group(2) or match.group(1), match.group(0) if default is None else default)

    pattern = (r'(?<!\\)' if skip_escaped else '') + r'\$(\w+|\{([^}]*)\})'
    return sub(pattern, replace_var, buffer)


def command_output(cmd):
    """executes a command and grabs its output, if any"""
    try:
        env = environ
        return str(check_output(cmd, stderr=STDOUT, env=env, shell=True).decode())
    except Exception:
        return ""

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