~launchpad-pqm/launchpad/devel

Scripts and ZCML

----------------

The full Zope component architecture is available from scripts so long

as they call `execute_zcml_for_scripts()`.

Let's make a simple example script that uses getUtility and the database

to demonstrate this:

    >>> import os

    >>> import subprocess

    >>> import tempfile

    >>> from textwrap import dedent

    >>> script_file = tempfile.NamedTemporaryFile()

    >>> script_file.write(dedent("""\

    ...     from lp.services.scripts import execute_zcml_for_scripts

    ...     from lp.registry.interfaces.person import IPersonSet

    ...     from zope.component import getUtility

    ... 

    ...     execute_zcml_for_scripts()

    ...     print getUtility(IPersonSet).get(1).displayname

    ...     """))

    >>> script_file.flush()

Run the script (making sure it uses the testrunner configuration).

    >>> from lp.services.config import config

    >>> bin_py = os.path.join(config.root, 'bin', 'py')

    >>> proc = subprocess.Popen(

    ...     [bin_py, script_file.name], stdout=subprocess.PIPE, stderr=None)

Check that we get the expected output.

    >>> print proc.stdout.read()

    Mark Shuttleworth

    >>> print proc.wait()

    0

Remove the temporary file.

    >>> script_file.close()