~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2005, 2007 Canonical Ltd

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""Tests for plugins"""

# XXX: There are no plugin tests at the moment because the plugin module

# affects the global state of the process.  See bzrlib/plugins.py for more

# comments.

import os

from StringIO import StringIO

import sys

import zipfile

from bzrlib import plugin, tests

import bzrlib.plugin

import bzrlib.plugins

import bzrlib.commands

import bzrlib.help

from bzrlib.tests import TestCase, TestCaseInTempDir

from bzrlib.osutils import pathjoin, abspath

PLUGIN_TEXT = """\

import bzrlib.commands

class cmd_myplug(bzrlib.commands.Command):

    '''Just a simple test plugin.'''

    aliases = ['mplg']

    def run(self):

        print 'Hello from my plugin'

"""

# TODO: Write a test for plugin decoration of commands.

class TestLoadingPlugins(TestCaseInTempDir):

    activeattributes = {}

    def test_plugins_with_the_same_name_are_not_loaded(self):

        # This test tests that having two plugins in different directories does

        # not result in both being loaded when they have the same name.  get a

        # file name we can use which is also a valid attribute for accessing in

        # activeattributes. - we cannot give import parameters.

        tempattribute = "0"

        self.failIf(tempattribute in self.activeattributes)

        # set a place for the plugins to record their loading, and at the same

        # time validate that the location the plugins should record to is

        # valid and correct.

        bzrlib.tests.test_plugins.TestLoadingPlugins.activeattributes \

            [tempattribute] = []

        self.failUnless(tempattribute in self.activeattributes)

        # create two plugin directories

        os.mkdir('first')

        os.mkdir('second')

        # write a plugin that will record when its loaded in the 

        # tempattribute list.

        template = ("from bzrlib.tests.test_plugins import TestLoadingPlugins\n"

                    "TestLoadingPlugins.activeattributes[%r].append('%s')\n")

        print >> file(os.path.join('first', 'plugin.py'), 'w'), template % (tempattribute, 'first')

        print >> file(os.path.join('second', 'plugin.py'), 'w'), template % (tempattribute, 'second')

        try:

            bzrlib.plugin.load_from_path(['first', 'second'])

            self.assertEqual(['first'], self.activeattributes[tempattribute])

        finally:

            # remove the plugin 'plugin'

            del self.activeattributes[tempattribute]

            if getattr(bzrlib.plugins, 'plugin', None):

                del bzrlib.plugins.plugin

        self.failIf(getattr(bzrlib.plugins, 'plugin', None))

    def test_plugins_from_different_dirs_can_demand_load(self):

        # This test tests that having two plugins in different

        # directories with different names allows them both to be loaded, when

        # we do a direct import statement.

        # Determine a file name we can use which is also a valid attribute

        # for accessing in activeattributes. - we cannot give import parameters.

        tempattribute = "different-dirs"

        self.failIf(tempattribute in self.activeattributes)

        # set a place for the plugins to record their loading, and at the same

        # time validate that the location the plugins should record to is

        # valid and correct.

        bzrlib.tests.test_plugins.TestLoadingPlugins.activeattributes \

            [tempattribute] = []

        self.failUnless(tempattribute in self.activeattributes)

        # create two plugin directories

        os.mkdir('first')

        os.mkdir('second')

        # write plugins that will record when they are loaded in the 

        # tempattribute list.

        template = ("from bzrlib.tests.test_plugins import TestLoadingPlugins\n"

                    "TestLoadingPlugins.activeattributes[%r].append('%s')\n")

        print >> file(os.path.join('first', 'pluginone.py'), 'w'), template % (tempattribute, 'first')

        print >> file(os.path.join('second', 'plugintwo.py'), 'w'), template % (tempattribute, 'second')

        oldpath = bzrlib.plugins.__path__

        try:

            bzrlib.plugins.__path__ = ['first', 'second']

            exec "import bzrlib.plugins.pluginone"

            self.assertEqual(['first'], self.activeattributes[tempattribute])

            exec "import bzrlib.plugins.plugintwo"

            self.assertEqual(['first', 'second'],

                self.activeattributes[tempattribute])

        finally:

            # remove the plugin 'plugin'

            del self.activeattributes[tempattribute]

            if getattr(bzrlib.plugins, 'plugin', None):

                del bzrlib.plugins.plugin

        self.failIf(getattr(bzrlib.plugins, 'plugin', None))

class TestAllPlugins(TestCaseInTempDir):

    def test_plugin_appears_in_all_plugins(self):

        # This test tests a new plugin appears in bzrlib.plugin.all_plugins().

        # check the plugin is not loaded already

        self.failIf(getattr(bzrlib.plugins, 'plugin', None))

        # write a plugin that _cannot_ fail to load.

        print >> file('plugin.py', 'w'), ""

        try:

            bzrlib.plugin.load_from_path(['.'])

            self.failUnless('plugin' in bzrlib.plugin.all_plugins())

            self.failUnless(getattr(bzrlib.plugins, 'plugin', None))

            self.assertEqual(bzrlib.plugin.all_plugins()['plugin'],

                             bzrlib.plugins.plugin)

        finally:

            # remove the plugin 'plugin'

            if 'bzrlib.plugins.plugin' in sys.modules:

                del sys.modules['bzrlib.plugins.plugin']

            if getattr(bzrlib.plugins, 'plugin', None):

                del bzrlib.plugins.plugin

        self.failIf(getattr(bzrlib.plugins, 'plugin', None))

class TestPluginHelp(TestCaseInTempDir):

    def split_help_commands(self):

        help = {}

        current = None

        for line in self.capture('help commands').splitlines():

            if not line.startswith(' '):

                current = line.split()[0]

            help[current] = help.get(current, '') + line

        return help

    def test_plugin_help_builtins_unaffected(self):

        # Check we don't get false positives

        help_commands = self.split_help_commands()

        for cmd_name in bzrlib.commands.builtin_command_names():

            if cmd_name in bzrlib.commands.plugin_command_names():

                continue

            try:

                help = bzrlib.commands.get_cmd_object(cmd_name).get_help_text()

            except NotImplementedError:

                # some commands have no help

                pass

            else:

                self.assertNotContainsRe(help, 'From plugin "[^"]*"')

            if cmd_name in help_commands.keys():

                # some commands are hidden

                help = help_commands[cmd_name]

                self.assertNotContainsRe(help, 'From plugin "[^"]*"')

    def test_plugin_help_shows_plugin(self):

        # Create a test plugin

        os.mkdir('plugin_test')

        f = open(pathjoin('plugin_test', 'myplug.py'), 'w')

        f.write(PLUGIN_TEXT)

        f.close()

        try:

            # Check its help

            bzrlib.plugin.load_from_path(['plugin_test'])

            bzrlib.commands.register_command( bzrlib.plugins.myplug.cmd_myplug)

            help = self.capture('help myplug')

            self.assertContainsRe(help, 'From plugin "myplug"')

            help = self.split_help_commands()['myplug']

            self.assertContainsRe(help, '\[myplug\]')

        finally:

            # unregister command

            if bzrlib.commands.plugin_cmds.get('myplug', None):

                del bzrlib.commands.plugin_cmds['myplug']

            # remove the plugin 'myplug'

            if getattr(bzrlib.plugins, 'myplug', None):

                delattr(bzrlib.plugins, 'myplug')

class TestPluginFromZip(TestCaseInTempDir):

    def make_zipped_plugin(self, zip_name, filename):

        z = zipfile.ZipFile(zip_name, 'w')

        z.writestr(filename, PLUGIN_TEXT)

        z.close()

    def check_plugin_load(self, zip_name, plugin_name):

        self.assertFalse(plugin_name in dir(bzrlib.plugins),

                         'Plugin already loaded')

        try:

            bzrlib.plugin.load_from_zip(zip_name)

            self.assertTrue(plugin_name in dir(bzrlib.plugins),

                            'Plugin is not loaded')

        finally:

            # unregister plugin

            if getattr(bzrlib.plugins, plugin_name, None):

                delattr(bzrlib.plugins, plugin_name)

    def test_load_module(self):

        self.make_zipped_plugin('./test.zip', 'ziplug.py')

        self.check_plugin_load('./test.zip', 'ziplug')

    def test_load_package(self):

        self.make_zipped_plugin('./test.zip', 'ziplug/__init__.py')

        self.check_plugin_load('./test.zip', 'ziplug')

class TestSetPluginsPath(TestCase):

    def test_set_plugins_path(self):

        """set_plugins_path should set the module __path__ correctly."""

        old_path = bzrlib.plugins.__path__

        try:

            bzrlib.plugins.__path__ = []

            expected_path = bzrlib.plugin.set_plugins_path()

            self.assertEqual(expected_path, bzrlib.plugins.__path__)

        finally:

            bzrlib.plugins.__path__ = old_path

class TestHelpIndex(tests.TestCase):

    """Tests for the PluginsHelpIndex class."""

    def test_default_constructable(self):

        index = plugin.PluginsHelpIndex()

    def test_get_topics_None(self):

        """Searching for None returns an empty list."""

        index = plugin.PluginsHelpIndex()

        self.assertEqual([], index.get_topics(None))

    def test_get_topics_for_plugin(self):

        """Searching for plugin name gets its docstring."""

        index = plugin.PluginsHelpIndex()

        # make a new plugin here for this test, even if we're run with

        # --no-plugins

        self.assertFalse(sys.modules.has_key('bzrlib.plugins.demo_module'))

        demo_module = FakeModule('', 'bzrlib.plugins.demo_module')

        sys.modules['bzrlib.plugins.demo_module'] = demo_module

        try:

            topics = index.get_topics('demo_module')

            self.assertEqual(1, len(topics))

            self.assertIsInstance(topics[0], plugin.ModuleHelpTopic)

            self.assertEqual(demo_module, topics[0].module)

        finally:

            del sys.modules['bzrlib.plugins.demo_module']

    def test_get_topics_no_topic(self):

        """Searching for something that is not a plugin returns []."""

        # test this by using a name that cannot be a plugin - its not

        # a valid python identifier.

        index = plugin.PluginsHelpIndex()

        self.assertEqual([], index.get_topics('nothing by this name'))

    def test_prefix(self):

        """PluginsHelpIndex has a prefix of 'plugins/'."""

        index = plugin.PluginsHelpIndex()

        self.assertEqual('plugins/', index.prefix)

    def test_get_plugin_topic_with_prefix(self):

        """Searching for plugins/demo_module returns help."""

        index = plugin.PluginsHelpIndex()

        self.assertFalse(sys.modules.has_key('bzrlib.plugins.demo_module'))

        demo_module = FakeModule('', 'bzrlib.plugins.demo_module')

        sys.modules['bzrlib.plugins.demo_module'] = demo_module

        try:

            topics = index.get_topics('plugins/demo_module')

            self.assertEqual(1, len(topics))

            self.assertIsInstance(topics[0], plugin.ModuleHelpTopic)

            self.assertEqual(demo_module, topics[0].module)

        finally:

            del sys.modules['bzrlib.plugins.demo_module']

class FakeModule(object):

    """A fake module to test with."""

    def __init__(self, doc, name):

        self.__doc__ = doc

        self.__name__ = name

class TestModuleHelpTopic(tests.TestCase):

    """Tests for the ModuleHelpTopic class."""

    def test_contruct(self):

        """Construction takes the module to document."""

        mod = FakeModule('foo', 'foo')

        topic = plugin.ModuleHelpTopic(mod)

        self.assertEqual(mod, topic.module)

    def test_get_help_text_None(self):

        """A ModuleHelpTopic returns the docstring for get_help_text."""

        mod = FakeModule(None, 'demo')

        topic = plugin.ModuleHelpTopic(mod)

        self.assertEqual("Plugin 'demo' has no docstring.\n",

            topic.get_help_text())

    def test_get_help_text_no_carriage_return(self):

        """ModuleHelpTopic.get_help_text adds a \n if needed."""

        mod = FakeModule('one line of help', 'demo')

        topic = plugin.ModuleHelpTopic(mod)

        self.assertEqual("one line of help\n",

            topic.get_help_text())

    def test_get_help_text_carriage_return(self):

        """ModuleHelpTopic.get_help_text adds a \n if needed."""

        mod = FakeModule('two lines of help\nand more\n', 'demo')

        topic = plugin.ModuleHelpTopic(mod)

        self.assertEqual("two lines of help\nand more\n",

            topic.get_help_text())

    def test_get_help_text_with_additional_see_also(self):

        mod = FakeModule('two lines of help\nand more', 'demo')

        topic = plugin.ModuleHelpTopic(mod)

        self.assertEqual("two lines of help\nand more\nSee also: bar, foo\n",

            topic.get_help_text(['foo', 'bar']))

    def test_get_help_topic(self):

        """The help topic for a plugin is its module name."""

        mod = FakeModule('two lines of help\nand more', 'bzrlib.plugins.demo')

        topic = plugin.ModuleHelpTopic(mod)

        self.assertEqual('demo', topic.get_help_topic())

        mod = FakeModule('two lines of help\nand more', 'bzrlib.plugins.foo_bar')

        topic = plugin.ModuleHelpTopic(mod)

        self.assertEqual('foo_bar', topic.get_help_topic())