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utils.py

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"""

Utilities for end-users.

"""

from __future__ import absolute_import

import __main__

from collections import namedtuple

import re

import os

import sys

from jedi import Interpreter

from jedi.api.helpers import completion_parts

from jedi.parser.user_context import UserContext

def setup_readline(namespace_module=__main__):

"""

Install Jedi completer to :mod:`readline`.

This function setups :mod:`readline` to use Jedi in Python interactive

shell. If you want to use a custom ``PYTHONSTARTUP`` file (typically

``$HOME/.pythonrc.py``), you can add this piece of code::

try:

from jedi.utils import setup_readline

setup_readline()

except ImportError:

# Fallback to the stdlib readline completer if it is installed.

# Taken from http://docs.python.org/2/library/rlcompleter.html

print("Jedi is not installed, falling back to readline")

try:

import readline

import rlcompleter

readline.parse_and_bind("tab: complete")

except ImportError:

print("Readline is not installed either. No tab completion is enabled.")

This will fallback to the readline completer if Jedi is not installed.

The readline completer will only complete names in the global namespace,

so for example::

ran<TAB>

will complete to ``range``

with both Jedi and readline, but::

range(10).cou<TAB>

will show complete to ``range(10).count`` only with Jedi.

You'll also need to add ``export PYTHONSTARTUP=$HOME/.pythonrc.py`` to

your shell profile (usually ``.bash_profile`` or ``.profile`` if you use

bash).

"""

class JediRL(object):

def complete(self, text, state):

"""

This complete stuff is pretty weird, a generator would make

a lot more sense, but probably due to backwards compatibility

this is still the way how it works.

The only important part is stuff in the ``state == 0`` flow,

everything else has been copied from the ``rlcompleter`` std.

library module.

"""

if state == 0:

sys.path.insert(0, os.getcwd())

# Calling python doesn't have a path, so add to sys.path.

try:

interpreter = Interpreter(text, [namespace_module.__dict__])

path = UserContext(text, (1, len(text))).get_path_until_cursor()

path, dot, like = completion_parts(path)

before = text[:len(text) - len(like)]

completions = interpreter.completions()

finally:

sys.path.pop(0)

self.matches = [before + c.name_with_symbols for c in completions]

try:

return self.matches[state]

except IndexError:

return None

try:

import readline

except ImportError:

print("Module readline not available.")

else:

readline.set_completer(JediRL().complete)

readline.parse_and_bind("tab: complete")

# jedi itself does the case matching

readline.parse_and_bind("set completion-ignore-case on")

# because it's easier to hit the tab just once

readline.parse_and_bind("set show-all-if-unmodified")

readline.parse_and_bind("set show-all-if-ambiguous on")

# don't repeat all the things written in the readline all the time

readline.parse_and_bind("set completion-prefix-display-length 2")

# No delimiters, Jedi handles that.

readline.set_completer_delims('')

def version_info():

"""

Returns a namedtuple of Jedi's version, similar to Python's

``sys.version_info``.

"""

Version = namedtuple('Version', 'major, minor, micro')

from jedi import __version__

tupl = re.findall('[a-z]+|\d+', __version__)

return Version(*[x if i == 3 else int(x) for i, x in enumerate(tupl)])