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"""Implementations for various useful completers.
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These are all loaded by default by IPython.
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2010-2011 The IPython Development Team.
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#
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# Distributed under the terms of the 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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from __future__ import print_function
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# Stdlib imports
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import glob
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import inspect
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import os
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import re
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import shlex
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import sys
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# Third-party imports
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from time import time
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from zipimport import zipimporter
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# Our own imports
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from IPython.core.completer import expand_user, compress_user
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from IPython.core.error import TryNext
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from IPython.utils import py3compat
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# FIXME: this should be pulled in with the right call via the component system
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from IPython.core.ipapi import get as get_ipython
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#-----------------------------------------------------------------------------
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# Globals and constants
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#-----------------------------------------------------------------------------
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# Time in seconds after which the rootmodules will be stored permanently in the
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# ipython ip.db database (kept in the user's .ipython dir).
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TIMEOUT_STORAGE = 2
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# Time in seconds after which we give up
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TIMEOUT_GIVEUP = 20
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# Regular expression for the python import statement
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import_re = re.compile(r'.*(\.so|\.py[cod]?)$')
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# RE for the ipython %run command (python + ipython scripts)
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magic_run_re = re.compile(r'.*(\.ipy|\.py[w]?)$')
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#-----------------------------------------------------------------------------
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# Local utilities
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#-----------------------------------------------------------------------------
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def shlex_split(x):
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"""Helper function to split lines into segments.
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"""
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# shlex.split raises an exception if there is a syntax error in sh syntax
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# for example if no closing " is found. This function keeps dropping the
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# last character of the line until shlex.split does not raise
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# an exception. It adds end of the line to the result of shlex.split
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#
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# Example:
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# %run "c:/python -> ['%run','"c:/python']
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# shlex.split has unicode bugs in Python 2, so encode first to str
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if not py3compat.PY3:
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x = py3compat.cast_bytes(x)
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endofline = []
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while x != '':
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try:
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comps = shlex.split(x)
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if len(endofline) >= 1:
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comps.append(''.join(endofline))
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return comps
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except ValueError:
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endofline = [x[-1:]]+endofline
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x = x[:-1]
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return [''.join(endofline)]
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def module_list(path):
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"""
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Return the list containing the names of the modules available in the given
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folder.
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"""
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if os.path.isdir(path):
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folder_list = os.listdir(path)
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elif path.endswith('.egg'):
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try:
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folder_list = [f for f in zipimporter(path)._files]
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except:
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folder_list = []
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else:
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folder_list = []
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if not folder_list:
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return []
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# A few local constants to be used in loops below
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isfile = os.path.isfile
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pjoin = os.path.join
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basename = os.path.basename
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# Now find actual path matches for packages or modules
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folder_list = [p for p in folder_list
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if isfile(pjoin(path, p,'__init__.py'))
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or import_re.match(p) ]
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return [basename(p).split('.')[0] for p in folder_list]
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def get_root_modules():
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"""
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Returns a list containing the names of all the modules available in the
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folders of the pythonpath.
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"""
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ip = get_ipython()
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if 'rootmodules' in ip.db:
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return ip.db['rootmodules']
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t = time()
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store = False
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modules = list(sys.builtin_module_names)
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for path in sys.path:
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modules += module_list(path)
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if time() - t >= TIMEOUT_STORAGE and not store:
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store = True
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print("\nCaching the list of root modules, please wait!")
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print("(This will only be done once - type '%rehashx' to "
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"reset cache!)\n")
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sys.stdout.flush()
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if time() - t > TIMEOUT_GIVEUP:
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print("This is taking too long, we give up.\n")
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ip.db['rootmodules'] = []
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return []
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modules = set(modules)
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if '__init__' in modules:
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modules.remove('__init__')
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modules = list(modules)
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if store:
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ip.db['rootmodules'] = modules
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return modules
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def is_importable(module, attr, only_modules):
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if only_modules:
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return inspect.ismodule(getattr(module, attr))
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else:
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return not(attr[:2] == '__' and attr[-2:] == '__')
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def try_import(mod, only_modules=False):
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try:
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m = __import__(mod)
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except:
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return []
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mods = mod.split('.')
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for module in mods[1:]:
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m = getattr(m, module)
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m_is_init = hasattr(m, '__file__') and '__init__' in m.__file__
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completions = []
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if (not hasattr(m, '__file__')) or (not only_modules) or m_is_init:
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completions.extend( [attr for attr in dir(m) if
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is_importable(m, attr, only_modules)])
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completions.extend(getattr(m, '__all__', []))
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if m_is_init:
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completions.extend(module_list(os.path.dirname(m.__file__)))
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completions = set(completions)
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if '__init__' in completions:
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completions.remove('__init__')
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return list(completions)
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#-----------------------------------------------------------------------------
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# Completion-related functions.
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#-----------------------------------------------------------------------------
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def quick_completer(cmd, completions):
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""" Easily create a trivial completer for a command.
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Takes either a list of completions, or all completions in string (that will
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be split on whitespace).
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Example::
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[d:\ipython]|1> import ipy_completers
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[d:\ipython]|2> ipy_completers.quick_completer('foo', ['bar','baz'])
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[d:\ipython]|3> foo b<TAB>
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bar baz
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[d:\ipython]|3> foo ba
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"""
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if isinstance(completions, basestring):
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completions = completions.split()
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def do_complete(self, event):
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return completions
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get_ipython().set_hook('complete_command',do_complete, str_key = cmd)
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def module_completion(line):
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"""
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Returns a list containing the completion possibilities for an import line.
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The line looks like this :
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'import xml.d'
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'from xml.dom import'
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"""
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words = line.split(' ')
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nwords = len(words)
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# from whatever <tab> -> 'import '
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if nwords == 3 and words[0] == 'from':
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return ['import ']
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# 'from xy<tab>' or 'import xy<tab>'
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if nwords < 3 and (words[0] in ['import','from']) :
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if nwords == 1:
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return get_root_modules()
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mod = words[1].split('.')
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if len(mod) < 2:
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return get_root_modules()
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completion_list = try_import('.'.join(mod[:-1]), True)
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return ['.'.join(mod[:-1] + [el]) for el in completion_list]
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# 'from xyz import abc<tab>'
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if nwords >= 3 and words[0] == 'from':
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mod = words[1]
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return try_import(mod)
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#-----------------------------------------------------------------------------
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# Completers
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#-----------------------------------------------------------------------------
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# These all have the func(self, event) signature to be used as custom
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# completers
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def module_completer(self,event):
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"""Give completions after user has typed 'import ...' or 'from ...'"""
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# This works in all versions of python. While 2.5 has
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# pkgutil.walk_packages(), that particular routine is fairly dangerous,
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# since it imports *EVERYTHING* on sys.path. That is: a) very slow b) full
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# of possibly problematic side effects.
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# This search the folders in the sys.path for available modules.
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return module_completion(event.line)
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# FIXME: there's a lot of logic common to the run, cd and builtin file
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# completers, that is currently reimplemented in each.
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def magic_run_completer(self, event):
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"""Complete files that end in .py or .ipy for the %run command.
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"""
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comps = shlex_split(event.line)
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relpath = (len(comps) > 1 and comps[-1] or '').strip("'\"")
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#print("\nev=", event) # dbg
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#print("rp=", relpath) # dbg
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#print('comps=', comps) # dbg
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lglob = glob.glob
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isdir = os.path.isdir
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relpath, tilde_expand, tilde_val = expand_user(relpath)
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dirs = [f.replace('\\','/') + "/" for f in lglob(relpath+'*') if isdir(f)]
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# Find if the user has already typed the first filename, after which we
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# should complete on all files, since after the first one other files may
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# be arguments to the input script.
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if filter(magic_run_re.match, comps):
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pys = [f.replace('\\','/') for f in lglob('*')]
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else:
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pys = [f.replace('\\','/')
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for f in lglob(relpath+'*.py') + lglob(relpath+'*.ipy') +
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lglob(relpath + '*.pyw')]
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#print('run comp:', dirs+pys) # dbg
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return [compress_user(p, tilde_expand, tilde_val) for p in dirs+pys]
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def cd_completer(self, event):
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"""Completer function for cd, which only returns directories."""
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ip = get_ipython()
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relpath = event.symbol
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#print(event) # dbg
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if event.line.endswith('-b') or ' -b ' in event.line:
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# return only bookmark completions
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bkms = self.db.get('bookmarks', None)
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if bkms:
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return bkms.keys()
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else:
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return []
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if event.symbol == '-':
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width_dh = str(len(str(len(ip.user_ns['_dh']) + 1)))
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# jump in directory history by number
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fmt = '-%0' + width_dh +'d [%s]'
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ents = [ fmt % (i,s) for i,s in enumerate(ip.user_ns['_dh'])]
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if len(ents) > 1:
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return ents
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return []
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if event.symbol.startswith('--'):
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return ["--" + os.path.basename(d) for d in ip.user_ns['_dh']]
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# Expand ~ in path and normalize directory separators.
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relpath, tilde_expand, tilde_val = expand_user(relpath)
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relpath = relpath.replace('\\','/')
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found = []
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for d in [f.replace('\\','/') + '/' for f in glob.glob(relpath+'*')
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if os.path.isdir(f)]:
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if ' ' in d:
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# we don't want to deal with any of that, complex code
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# for this is elsewhere
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raise TryNext
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found.append(d)
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if not found:
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if os.path.isdir(relpath):
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return [compress_user(relpath, tilde_expand, tilde_val)]
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# if no completions so far, try bookmarks
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bks = self.db.get('bookmarks',{}).iterkeys()
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bkmatches = [s for s in bks if s.startswith(event.symbol)]
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if bkmatches:
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return bkmatches
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raise TryNext
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return [compress_user(p, tilde_expand, tilde_val) for p in found]
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