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# -*- coding: utf-8 -*-
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"""Subclass of InteractiveShell for terminal based frontends."""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2001 Janko Hauser <jhauser@zscout.de>
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# Copyright (C) 2001-2007 Fernando Perez. <fperez@colorado.edu>
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# Copyright (C) 2008-2010 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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import __builtin__
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import bdb
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from contextlib import nested
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import os
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import re
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import sys
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from IPython.core.error import TryNext
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from IPython.core.usage import interactive_usage, default_banner
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from IPython.core.inputlist import InputList
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from IPython.core.interactiveshell import InteractiveShell, InteractiveShellABC
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from IPython.lib.inputhook import enable_gui
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from IPython.lib.pylabtools import pylab_activate
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from IPython.utils.terminal import toggle_set_term_title, set_term_title
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from IPython.utils.process import abbrev_cwd
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from IPython.utils.warn import warn
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from IPython.utils.text import num_ini_spaces
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from IPython.utils.traitlets import Int, Str, CBool
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#-----------------------------------------------------------------------------
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# Utilities
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#-----------------------------------------------------------------------------
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def get_default_editor():
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try:
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ed = os.environ['EDITOR']
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except KeyError:
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if os.name == 'posix':
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ed = 'vi' # the only one guaranteed to be there!
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else:
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ed = 'notepad' # same in Windows!
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return ed
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# store the builtin raw_input globally, and use this always, in case user code
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# overwrites it (like wx.py.PyShell does)
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raw_input_original = raw_input
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#-----------------------------------------------------------------------------
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# Main class
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#-----------------------------------------------------------------------------
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class TerminalInteractiveShell(InteractiveShell):
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autoedit_syntax = CBool(False, config=True)
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banner = Str('')
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banner1 = Str(default_banner, config=True)
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banner2 = Str('', config=True)
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confirm_exit = CBool(True, config=True)
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# This display_banner only controls whether or not self.show_banner()
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# is called when mainloop/interact are called. The default is False
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# because for the terminal based application, the banner behavior
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# is controlled by Global.display_banner, which IPythonApp looks at
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# to determine if *it* should call show_banner() by hand or not.
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display_banner = CBool(False) # This isn't configurable!
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embedded = CBool(False)
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embedded_active = CBool(False)
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editor = Str(get_default_editor(), config=True)
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pager = Str('less', config=True)
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screen_length = Int(0, config=True)
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term_title = CBool(False, config=True)
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def __init__(self, config=None, ipython_dir=None, user_ns=None,
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user_global_ns=None, custom_exceptions=((),None),
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usage=None, banner1=None, banner2=None,
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display_banner=None):
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super(TerminalInteractiveShell, self).__init__(
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config=config, ipython_dir=ipython_dir, user_ns=user_ns,
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user_global_ns=user_global_ns, custom_exceptions=custom_exceptions
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)
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self.init_term_title()
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self.init_usage(usage)
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self.init_banner(banner1, banner2, display_banner)
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#-------------------------------------------------------------------------
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# Things related to the terminal
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#-------------------------------------------------------------------------
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@property
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def usable_screen_length(self):
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if self.screen_length == 0:
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return 0
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else:
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num_lines_bot = self.separate_in.count('\n')+1
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return self.screen_length - num_lines_bot
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def init_term_title(self):
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# Enable or disable the terminal title.
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if self.term_title:
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toggle_set_term_title(True)
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set_term_title('IPython: ' + abbrev_cwd())
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else:
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toggle_set_term_title(False)
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#-------------------------------------------------------------------------
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# Things related to the banner and usage
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#-------------------------------------------------------------------------
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def _banner1_changed(self):
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self.compute_banner()
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def _banner2_changed(self):
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self.compute_banner()
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def _term_title_changed(self, name, new_value):
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self.init_term_title()
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def init_banner(self, banner1, banner2, display_banner):
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if banner1 is not None:
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self.banner1 = banner1
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if banner2 is not None:
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self.banner2 = banner2
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if display_banner is not None:
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self.display_banner = display_banner
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self.compute_banner()
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def show_banner(self, banner=None):
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if banner is None:
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banner = self.banner
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self.write(banner)
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def compute_banner(self):
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self.banner = self.banner1 + '\n'
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if self.profile:
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self.banner += '\nIPython profile: %s\n' % self.profile
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if self.banner2:
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self.banner += '\n' + self.banner2 + '\n'
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def init_usage(self, usage=None):
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if usage is None:
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self.usage = interactive_usage
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else:
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self.usage = usage
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#-------------------------------------------------------------------------
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# Mainloop and code execution logic
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#-------------------------------------------------------------------------
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def mainloop(self, display_banner=None):
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"""Start the mainloop.
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If an optional banner argument is given, it will override the
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internally created default banner.
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"""
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with nested(self.builtin_trap, self.display_trap):
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# if you run stuff with -c <cmd>, raw hist is not updated
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# ensure that it's in sync
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if len(self.input_hist) != len (self.input_hist_raw):
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self.input_hist_raw = InputList(self.input_hist)
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while 1:
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try:
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self.interact(display_banner=display_banner)
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#self.interact_with_readline()
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# XXX for testing of a readline-decoupled repl loop, call
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# interact_with_readline above
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break
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except KeyboardInterrupt:
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# this should not be necessary, but KeyboardInterrupt
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# handling seems rather unpredictable...
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self.write("\nKeyboardInterrupt in interact()\n")
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def interact(self, display_banner=None):
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"""Closely emulate the interactive Python console."""
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# batch run -> do not interact
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if self.exit_now:
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return
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if display_banner is None:
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display_banner = self.display_banner
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if display_banner:
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self.show_banner()
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more = 0
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# Mark activity in the builtins
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__builtin__.__dict__['__IPYTHON__active'] += 1
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if self.has_readline:
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self.readline_startup_hook(self.pre_readline)
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# exit_now is set by a call to %Exit or %Quit, through the
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# ask_exit callback.
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while not self.exit_now:
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self.hooks.pre_prompt_hook()
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if more:
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try:
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prompt = self.hooks.generate_prompt(True)
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except:
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self.showtraceback()
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if self.autoindent:
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self.rl_do_indent = True
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else:
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try:
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prompt = self.hooks.generate_prompt(False)
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except:
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self.showtraceback()
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try:
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line = self.raw_input(prompt, more)
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if self.exit_now:
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# quick exit on sys.std[in|out] close
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break
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if self.autoindent:
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self.rl_do_indent = False
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except KeyboardInterrupt:
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#double-guard against keyboardinterrupts during kbdint handling
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try:
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self.write('\nKeyboardInterrupt\n')
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self.resetbuffer()
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# keep cache in sync with the prompt counter:
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self.displayhook.prompt_count -= 1
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if self.autoindent:
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self.indent_current_nsp = 0
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more = 0
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except KeyboardInterrupt:
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pass
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except EOFError:
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if self.autoindent:
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self.rl_do_indent = False
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if self.has_readline:
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self.readline_startup_hook(None)
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self.write('\n')
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self.exit()
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except bdb.BdbQuit:
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warn('The Python debugger has exited with a BdbQuit exception.\n'
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'Because of how pdb handles the stack, it is impossible\n'
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'for IPython to properly format this particular exception.\n'
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'IPython will resume normal operation.')
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except:
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# exceptions here are VERY RARE, but they can be triggered
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# asynchronously by signal handlers, for example.
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self.showtraceback()
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else:
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more = self.push_line(line)
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if (self.SyntaxTB.last_syntax_error and
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self.autoedit_syntax):
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self.edit_syntax_error()
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# We are off again...
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__builtin__.__dict__['__IPYTHON__active'] -= 1
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# Turn off the exit flag, so the mainloop can be restarted if desired
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self.exit_now = False
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def raw_input(self,prompt='',continue_prompt=False):
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"""Write a prompt and read a line.
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The returned line does not include the trailing newline.
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When the user enters the EOF key sequence, EOFError is raised.
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Optional inputs:
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- prompt(''): a string to be printed to prompt the user.
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- continue_prompt(False): whether this line is the first one or a
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continuation in a sequence of inputs.
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"""
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# growl.notify("raw_input: ", "prompt = %r\ncontinue_prompt = %s" % (prompt, continue_prompt))
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# Code run by the user may have modified the readline completer state.
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# We must ensure that our completer is back in place.
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if self.has_readline:
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self.set_completer()
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try:
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line = raw_input_original(prompt).decode(self.stdin_encoding)
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except ValueError:
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warn("\n********\nYou or a %run:ed script called sys.stdin.close()"
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" or sys.stdout.close()!\nExiting IPython!")
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self.ask_exit()
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return ""
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# Try to be reasonably smart about not re-indenting pasted input more
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# than necessary. We do this by trimming out the auto-indent initial
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# spaces, if the user's actual input started itself with whitespace.
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#debugx('self.buffer[-1]')
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if self.autoindent:
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if num_ini_spaces(line) > self.indent_current_nsp:
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line = line[self.indent_current_nsp:]
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self.indent_current_nsp = 0
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# store the unfiltered input before the user has any chance to modify
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# it.
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if line.strip():
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if continue_prompt:
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self.input_hist_raw[-1] += '%s\n' % line
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if self.has_readline and self.readline_use:
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try:
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histlen = self.readline.get_current_history_length()
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if histlen > 1:
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newhist = self.input_hist_raw[-1].rstrip()
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self.readline.remove_history_item(histlen-1)
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self.readline.replace_history_item(histlen-2,
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newhist.encode(self.stdin_encoding))
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except AttributeError:
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pass # re{move,place}_history_item are new in 2.4.
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else:
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self.input_hist_raw.append('%s\n' % line)
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# only entries starting at first column go to shadow history
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if line.lstrip() == line:
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self.shadowhist.add(line.strip())
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elif not continue_prompt:
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self.input_hist_raw.append('\n')
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try:
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lineout = self.prefilter_manager.prefilter_lines(line,continue_prompt)
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except:
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# blanket except, in case a user-defined prefilter crashes, so it
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# can't take all of ipython with it.
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self.showtraceback()
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return ''
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else:
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return lineout
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# TODO: The following three methods are an early attempt to refactor
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# the main code execution logic. We don't use them, but they may be
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# helpful when we refactor the code execution logic further.
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# def interact_prompt(self):
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# """ Print the prompt (in read-eval-print loop)
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#
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# Provided for those who want to implement their own read-eval-print loop (e.g. GUIs), not
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# used in standard IPython flow.
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# """
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# if self.more:
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# try:
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# prompt = self.hooks.generate_prompt(True)
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# except:
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# self.showtraceback()
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# if self.autoindent:
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# self.rl_do_indent = True
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#
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# else:
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# try:
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# prompt = self.hooks.generate_prompt(False)
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# except:
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# self.showtraceback()
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# self.write(prompt)
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#
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# def interact_handle_input(self,line):
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# """ Handle the input line (in read-eval-print loop)
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#
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# Provided for those who want to implement their own read-eval-print loop (e.g. GUIs), not
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# used in standard IPython flow.
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# """
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# if line.lstrip() == line:
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# self.shadowhist.add(line.strip())
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# lineout = self.prefilter_manager.prefilter_lines(line,self.more)
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#
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# if line.strip():
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# if self.more:
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# self.input_hist_raw[-1] += '%s\n' % line
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# else:
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# self.input_hist_raw.append('%s\n' % line)
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#
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#
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# self.more = self.push_line(lineout)
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# if (self.SyntaxTB.last_syntax_error and
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# self.autoedit_syntax):
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# self.edit_syntax_error()
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#
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# def interact_with_readline(self):
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# """ Demo of using interact_handle_input, interact_prompt
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#
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# This is the main read-eval-print loop. If you need to implement your own (e.g. for GUI),
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# it should work like this.
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# """
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# self.readline_startup_hook(self.pre_readline)
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# while not self.exit_now:
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# self.interact_prompt()
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# if self.more:
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# self.rl_do_indent = True
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# else:
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# self.rl_do_indent = False
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# line = raw_input_original().decode(self.stdin_encoding)
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# self.interact_handle_input(line)
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#-------------------------------------------------------------------------
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# Methods to support auto-editing of SyntaxErrors.
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#-------------------------------------------------------------------------
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def edit_syntax_error(self):
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"""The bottom half of the syntax error handler called in the main loop.
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Loop until syntax error is fixed or user cancels.
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"""
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while self.SyntaxTB.last_syntax_error:
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# copy and clear last_syntax_error
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err = self.SyntaxTB.clear_err_state()
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if not self._should_recompile(err):
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return
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try:
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# may set last_syntax_error again if a SyntaxError is raised
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self.safe_execfile(err.filename,self.user_ns)
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except:
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self.showtraceback()
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else:
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try:
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f = file(err.filename)
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try:
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# This should be inside a display_trap block and I
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# think it is.
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sys.displayhook(f.read())
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finally:
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f.close()
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except:
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self.showtraceback()
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def _should_recompile(self,e):
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|
"""Utility routine for edit_syntax_error"""
|
|
|
|
|
|
if e.filename in ('<ipython console>','<input>','<string>',
|
|
|
'<console>','<BackgroundJob compilation>',
|
|
|
None):
|
|
|
|
|
|
return False
|
|
|
try:
|
|
|
if (self.autoedit_syntax and
|
|
|
not self.ask_yes_no('Return to editor to correct syntax error? '
|
|
|
'[Y/n] ','y')):
|
|
|
return False
|
|
|
except EOFError:
|
|
|
return False
|
|
|
|
|
|
def int0(x):
|
|
|
try:
|
|
|
return int(x)
|
|
|
except TypeError:
|
|
|
return 0
|
|
|
# always pass integer line and offset values to editor hook
|
|
|
try:
|
|
|
self.hooks.fix_error_editor(e.filename,
|
|
|
int0(e.lineno),int0(e.offset),e.msg)
|
|
|
except TryNext:
|
|
|
warn('Could not open editor')
|
|
|
return False
|
|
|
return True
|
|
|
|
|
|
#-------------------------------------------------------------------------
|
|
|
# Things related to GUI support and pylab
|
|
|
#-------------------------------------------------------------------------
|
|
|
|
|
|
def enable_pylab(self, gui=None):
|
|
|
"""Activate pylab support at runtime.
|
|
|
|
|
|
This turns on support for matplotlib, preloads into the interactive
|
|
|
namespace all of numpy and pylab, and configures IPython to correcdtly
|
|
|
interact with the GUI event loop. The GUI backend to be used can be
|
|
|
optionally selected with the optional :param:`gui` argument.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
gui : optional, string
|
|
|
|
|
|
If given, dictates the choice of matplotlib GUI backend to use
|
|
|
(should be one of IPython's supported backends, 'tk', 'qt', 'wx' or
|
|
|
'gtk'), otherwise we use the default chosen by matplotlib (as
|
|
|
dictated by the matplotlib build-time options plus the user's
|
|
|
matplotlibrc configuration file).
|
|
|
"""
|
|
|
# We want to prevent the loading of pylab to pollute the user's
|
|
|
# namespace as shown by the %who* magics, so we execute the activation
|
|
|
# code in an empty namespace, and we update *both* user_ns and
|
|
|
# user_ns_hidden with this information.
|
|
|
ns = {}
|
|
|
gui = pylab_activate(ns, gui)
|
|
|
self.user_ns.update(ns)
|
|
|
self.user_ns_hidden.update(ns)
|
|
|
# Now we must activate the gui pylab wants to use, and fix %run to take
|
|
|
# plot updates into account
|
|
|
enable_gui(gui)
|
|
|
self.magic_run = self._pylab_magic_run
|
|
|
|
|
|
#-------------------------------------------------------------------------
|
|
|
# Things related to exiting
|
|
|
#-------------------------------------------------------------------------
|
|
|
|
|
|
def ask_exit(self):
|
|
|
""" Ask the shell to exit. Can be overiden and used as a callback. """
|
|
|
self.exit_now = True
|
|
|
|
|
|
def exit(self):
|
|
|
"""Handle interactive exit.
|
|
|
|
|
|
This method calls the ask_exit callback."""
|
|
|
if self.confirm_exit:
|
|
|
if self.ask_yes_no('Do you really want to exit ([y]/n)?','y'):
|
|
|
self.ask_exit()
|
|
|
else:
|
|
|
self.ask_exit()
|
|
|
|
|
|
|
|
|
InteractiveShellABC.register(TerminalInteractiveShell)
|
|
|
|
