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import os.path

import nose.tools as nt

import IPython.testing.tools as tt

from IPython.utils.syspathcontext import prepended_to_syspath

from IPython.utils.tempdir import TemporaryDirectory

ext1_content = """

def load_ipython_extension(ip):

print("Running ext1 load")

def unload_ipython_extension(ip):

print("Running ext1 unload")

"""

ext2_content = """

def load_ipython_extension(ip):

print("Running ext2 load")

"""

ext3_content = """

def load_ipython_extension(ip):

ip2 = get_ipython()

print(ip is ip2)

"""

def test_extension_loading():

em = get_ipython().extension_manager

with TemporaryDirectory() as td:

ext1 = os.path.join(td, 'ext1.py')

with open(ext1, 'w') as f:

f.write(ext1_content)

ext2 = os.path.join(td, 'ext2.py')

with open(ext2, 'w') as f:

f.write(ext2_content)

with prepended_to_syspath(td):

assert 'ext1' not in em.loaded

assert 'ext2' not in em.loaded

# Load extension

with tt.AssertPrints("Running ext1 load"):

assert em.load_extension('ext1') is None

assert 'ext1' in em.loaded

# Should refuse to load it again

with tt.AssertNotPrints("Running ext1 load"):

assert em.load_extension('ext1') == 'already loaded'

# Reload

with tt.AssertPrints("Running ext1 unload"):

with tt.AssertPrints("Running ext1 load", suppress=False):

em.reload_extension('ext1')

# Unload

with tt.AssertPrints("Running ext1 unload"):

assert em.unload_extension('ext1') is None

# Can't unload again

with tt.AssertNotPrints("Running ext1 unload"):

assert em.unload_extension('ext1') == 'not loaded'

assert em.unload_extension('ext2') == 'not loaded'

# Load extension 2

with tt.AssertPrints("Running ext2 load"):

assert em.load_extension('ext2') is None

# Can't unload this

assert em.unload_extension('ext2') == 'no unload function'

# But can reload it

with tt.AssertPrints("Running ext2 load"):

em.reload_extension('ext2')

def test_extension_builtins():

em = get_ipython().extension_manager

with TemporaryDirectory() as td:

ext3 = os.path.join(td, 'ext3.py')

with open(ext3, 'w') as f:

f.write(ext3_content)

assert 'ext3' not in em.loaded

with prepended_to_syspath(td):

# Load extension

with tt.AssertPrints("True"):

assert em.load_extension('ext3') is None

assert 'ext3' in em.loaded

def test_non_extension():

em = get_ipython().extension_manager

nt.assert_equal(em.load_extension('sys'), "no load function")