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"""Implementation of magic functions that control various automatic behaviors.
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"""
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#-----------------------------------------------------------------------------
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# Copyright (c) 2012 The IPython Development Team.
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#
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# Distributed under the terms of the Modified BSD License.
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#
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# The full license is in the file COPYING.txt, distributed with this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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# Our own packages
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from IPython.core.magic import Bunch, Magics, magics_class, line_magic
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from IPython.testing.skipdoctest import skip_doctest
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from IPython.utils.warn import error
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#-----------------------------------------------------------------------------
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# Magic implementation classes
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#-----------------------------------------------------------------------------
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@magics_class
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class AutoMagics(Magics):
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"""Magics that control various autoX behaviors."""
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def __init__(self, shell):
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super(AutoMagics, self).__init__(shell)
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# namespace for holding state we may need
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self._magic_state = Bunch()
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@line_magic
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def automagic(self, parameter_s=''):
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"""Make magic functions callable without having to type the initial %.
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Without argumentsl toggles on/off (when off, you must call it as
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%automagic, of course). With arguments it sets the value, and you can
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use any of (case insensitive):
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- on, 1, True: to activate
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- off, 0, False: to deactivate.
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Note that magic functions have lowest priority, so if there's a
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variable whose name collides with that of a magic fn, automagic won't
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work for that function (you get the variable instead). However, if you
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delete the variable (del var), the previously shadowed magic function
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becomes visible to automagic again."""
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arg = parameter_s.lower()
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mman = self.shell.magics_manager
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if arg in ('on', '1', 'true'):
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val = True
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elif arg in ('off', '0', 'false'):
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val = False
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else:
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val = not mman.auto_magic
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mman.auto_magic = val
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print '\n' + self.shell.magics_manager.auto_status()
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@skip_doctest
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@line_magic
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def autocall(self, parameter_s=''):
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"""Make functions callable without having to type parentheses.
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Usage:
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%autocall [mode]
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The mode can be one of: 0->Off, 1->Smart, 2->Full. If not given, the
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value is toggled on and off (remembering the previous state).
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In more detail, these values mean:
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0 -> fully disabled
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1 -> active, but do not apply if there are no arguments on the line.
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In this mode, you get::
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In [1]: callable
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Out[1]: <built-in function callable>
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In [2]: callable 'hello'
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------> callable('hello')
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Out[2]: False
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2 -> Active always. Even if no arguments are present, the callable
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object is called::
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In [2]: float
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------> float()
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Out[2]: 0.0
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Note that even with autocall off, you can still use '/' at the start of
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a line to treat the first argument on the command line as a function
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and add parentheses to it::
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In [8]: /str 43
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------> str(43)
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Out[8]: '43'
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# all-random (note for auto-testing)
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"""
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if parameter_s:
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arg = int(parameter_s)
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else:
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arg = 'toggle'
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if not arg in (0, 1, 2, 'toggle'):
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error('Valid modes: (0->Off, 1->Smart, 2->Full')
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return
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if arg in (0, 1, 2):
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self.shell.autocall = arg
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else: # toggle
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if self.shell.autocall:
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self._magic_state.autocall_save = self.shell.autocall
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self.shell.autocall = 0
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else:
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try:
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self.shell.autocall = self._magic_state.autocall_save
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except AttributeError:
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self.shell.autocall = self._magic_state.autocall_save = 1
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print "Automatic calling is:",['OFF','Smart','Full'][self.shell.autocall]
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