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"""
Shell command for Pecan.
"""
from pecan.commands import BaseCommand
from webtest import TestApp
from warnings import warn
import sys
class NativePythonShell(object):
"""
Open an interactive python shell with the Pecan app loaded.
"""
@classmethod
def invoke(cls, ns, banner): # pragma: nocover
"""
:param ns: local namespace
:param banner: interactive shell startup banner
Embed an interactive native python shell.
"""
import code
py_prefix = sys.platform.startswith('java') and 'J' or 'P'
shell_banner = 'Pecan Interactive Shell\n%sython %s\n\n' % \
(py_prefix, sys.version)
shell = code.InteractiveConsole(locals=ns)
try:
import readline # noqa
except ImportError:
pass
shell.interact(shell_banner + banner)
class IPythonShell(object):
"""
Open an interactive ipython shell with the Pecan app loaded.
"""
@classmethod
def invoke(cls, ns, banner): # pragma: nocover
"""
:param ns: local namespace
:param banner: interactive shell startup banner
Embed an interactive ipython shell.
Try the InteractiveShellEmbed API first, fall back on
IPShellEmbed for older IPython versions.
"""
try:
from IPython.frontend.terminal.embed import (
InteractiveShellEmbed
)
# try and load their default profile
from IPython.frontend.terminal.ipapp import (
load_default_config
)
config = load_default_config()
shell = InteractiveShellEmbed(config=config, banner2=banner)
shell(local_ns=ns)
except ImportError:
# Support for the IPython <= 0.10 shell API
from IPython.Shell import IPShellEmbed
shell = IPShellEmbed(argv=[])
shell.set_banner(shell.IP.BANNER + '\n\n' + banner)
shell(local_ns=ns, global_ns={})
class BPythonShell(object):
"""
Open an interactive bpython shell with the Pecan app loaded.
"""
@classmethod
def invoke(cls, ns, banner): # pragma: nocover
"""
:param ns: local namespace
:param banner: interactive shell startup banner
Embed an interactive bpython shell.
"""
from bpython import embed
embed(ns, ['-i'], banner)
class ShellCommand(BaseCommand):
"""
Open an interactive shell with the Pecan app loaded.
Attempt to invoke the specified python shell flavor
(ipython, bpython, etc.). Fall back on the native
python shell if the requested flavor variance is not
installed.
"""
SHELLS = {
'python': NativePythonShell,
'ipython': IPythonShell,
'bpython': BPythonShell,
}
arguments = BaseCommand.arguments + ({
'name': ['--shell', '-s'],
'help': 'which Python shell to use',
'choices': SHELLS.keys(),
'default': 'python'
},)
def run(self, args):
"""
Load the pecan app, prepare the locals, sets the
banner, and invokes the python shell.
"""
super(ShellCommand, self).run(args)
# load the application
app = self.load_app()
# prepare the locals
locs = dict(__name__='pecan-admin')
locs['wsgiapp'] = app
locs['app'] = TestApp(app)
model = self.load_model(app.config)
if model:
locs['model'] = model
# insert the pecan locals
exec(
'from pecan import abort, conf, redirect, request, response'
) in locs
# prepare the banner
banner = ' The following objects are available:\n'
banner += ' %-10s - This project\'s WSGI App instance\n' % 'wsgiapp'
banner += ' %-10s - The current configuration\n' % 'conf'
banner += ' %-10s - webtest.TestApp wrapped around wsgiapp\n' % 'app'
if model:
model_name = getattr(
model,
'__module__',
getattr(model, '__name__', 'model')
)
banner += ' %-10s - Models from %s\n' % ('model', model_name)
self.invoke_shell(locs, banner)
def invoke_shell(self, locs, banner):
"""
Invokes the appropriate flavor of the python shell.
Falls back on the native python shell if the requested
flavor (ipython, bpython,etc) is not installed.
"""
shell = self.SHELLS[self.args.shell]
try:
shell().invoke(locs, banner)
except ImportError, e:
warn((
"%s is not installed, `%s`, "
"falling back to native shell") % (self.args.shell, e),
RuntimeWarning
)
if shell == NativePythonShell:
raise
NativePythonShell().invoke(locs, banner)
def load_model(self, config):
"""
Load the model extension module
"""
for package_name in getattr(config.app, 'modules', []):
module = __import__(package_name, fromlist=['model'])
if hasattr(module, 'model'):
return module.model
return None
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