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"""A simple configuration system.
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Authors
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-------
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* Brian Granger
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* Fernando Perez
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* Min RK
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2008-2011 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__ as builtin_mod
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import os
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import re
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import sys
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from IPython.external import argparse
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from IPython.utils.path import filefind, get_ipython_dir
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from IPython.utils import py3compat, text, warn
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from IPython.utils.encoding import DEFAULT_ENCODING
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#-----------------------------------------------------------------------------
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# Exceptions
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#-----------------------------------------------------------------------------
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class ConfigError(Exception):
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pass
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class ConfigLoaderError(ConfigError):
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pass
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class ConfigFileNotFound(ConfigError):
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pass
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class ArgumentError(ConfigLoaderError):
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pass
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#-----------------------------------------------------------------------------
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# Argparse fix
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#-----------------------------------------------------------------------------
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# Unfortunately argparse by default prints help messages to stderr instead of
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# stdout. This makes it annoying to capture long help screens at the command
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# line, since one must know how to pipe stderr, which many users don't know how
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# to do. So we override the print_help method with one that defaults to
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# stdout and use our class instead.
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class ArgumentParser(argparse.ArgumentParser):
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"""Simple argparse subclass that prints help to stdout by default."""
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def print_help(self, file=None):
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if file is None:
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file = sys.stdout
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return super(ArgumentParser, self).print_help(file)
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print_help.__doc__ = argparse.ArgumentParser.print_help.__doc__
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#-----------------------------------------------------------------------------
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# Config class for holding config information
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#-----------------------------------------------------------------------------
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class Config(dict):
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"""An attribute based dict that can do smart merges."""
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def __init__(self, *args, **kwds):
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dict.__init__(self, *args, **kwds)
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# This sets self.__dict__ = self, but it has to be done this way
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# because we are also overriding __setattr__.
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dict.__setattr__(self, '__dict__', self)
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def _merge(self, other):
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to_update = {}
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for k, v in other.iteritems():
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if not self.has_key(k):
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to_update[k] = v
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else: # I have this key
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if isinstance(v, Config):
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# Recursively merge common sub Configs
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self[k]._merge(v)
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else:
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# Plain updates for non-Configs
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to_update[k] = v
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self.update(to_update)
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def _is_section_key(self, key):
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if key[0].upper()==key[0] and not key.startswith('_'):
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return True
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else:
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return False
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def __contains__(self, key):
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if self._is_section_key(key):
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return True
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else:
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return super(Config, self).__contains__(key)
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# .has_key is deprecated for dictionaries.
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has_key = __contains__
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def _has_section(self, key):
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if self._is_section_key(key):
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if super(Config, self).__contains__(key):
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return True
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return False
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def copy(self):
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return type(self)(dict.copy(self))
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def __copy__(self):
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return self.copy()
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def __deepcopy__(self, memo):
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import copy
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return type(self)(copy.deepcopy(self.items()))
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def __getitem__(self, key):
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# We cannot use directly self._is_section_key, because it triggers
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# infinite recursion on top of PyPy. Instead, we manually fish the
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# bound method.
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is_section_key = self.__class__._is_section_key.__get__(self)
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# Because we use this for an exec namespace, we need to delegate
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# the lookup of names in __builtin__ to itself. This means
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# that you can't have section or attribute names that are
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# builtins.
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try:
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return getattr(builtin_mod, key)
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except AttributeError:
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pass
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if is_section_key(key):
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try:
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return dict.__getitem__(self, key)
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except KeyError:
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c = Config()
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dict.__setitem__(self, key, c)
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return c
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else:
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return dict.__getitem__(self, key)
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def __setitem__(self, key, value):
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# Don't allow names in __builtin__ to be modified.
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if hasattr(builtin_mod, key):
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raise ConfigError('Config variable names cannot have the same name '
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'as a Python builtin: %s' % key)
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if self._is_section_key(key):
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if not isinstance(value, Config):
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raise ValueError('values whose keys begin with an uppercase '
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'char must be Config instances: %r, %r' % (key, value))
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else:
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dict.__setitem__(self, key, value)
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def __getattr__(self, key):
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try:
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return self.__getitem__(key)
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except KeyError, e:
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raise AttributeError(e)
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def __setattr__(self, key, value):
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try:
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self.__setitem__(key, value)
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except KeyError, e:
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raise AttributeError(e)
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def __delattr__(self, key):
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try:
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dict.__delitem__(self, key)
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except KeyError, e:
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raise AttributeError(e)
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#-----------------------------------------------------------------------------
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# Config loading classes
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#-----------------------------------------------------------------------------
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class ConfigLoader(object):
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"""A object for loading configurations from just about anywhere.
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The resulting configuration is packaged as a :class:`Struct`.
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Notes
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-----
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A :class:`ConfigLoader` does one thing: load a config from a source
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(file, command line arguments) and returns the data as a :class:`Struct`.
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There are lots of things that :class:`ConfigLoader` does not do. It does
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not implement complex logic for finding config files. It does not handle
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default values or merge multiple configs. These things need to be
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handled elsewhere.
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"""
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def __init__(self):
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"""A base class for config loaders.
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Examples
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--------
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>>> cl = ConfigLoader()
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>>> config = cl.load_config()
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>>> config
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{}
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"""
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self.clear()
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def clear(self):
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self.config = Config()
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def load_config(self):
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"""Load a config from somewhere, return a :class:`Config` instance.
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Usually, this will cause self.config to be set and then returned.
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However, in most cases, :meth:`ConfigLoader.clear` should be called
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to erase any previous state.
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"""
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self.clear()
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return self.config
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class FileConfigLoader(ConfigLoader):
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"""A base class for file based configurations.
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As we add more file based config loaders, the common logic should go
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here.
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"""
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pass
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class PyFileConfigLoader(FileConfigLoader):
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"""A config loader for pure python files.
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This calls execfile on a plain python file and looks for attributes
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that are all caps. These attribute are added to the config Struct.
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"""
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def __init__(self, filename, path=None):
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"""Build a config loader for a filename and path.
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Parameters
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----------
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filename : str
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The file name of the config file.
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path : str, list, tuple
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The path to search for the config file on, or a sequence of
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paths to try in order.
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"""
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super(PyFileConfigLoader, self).__init__()
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self.filename = filename
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self.path = path
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self.full_filename = ''
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self.data = None
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def load_config(self):
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"""Load the config from a file and return it as a Struct."""
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self.clear()
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try:
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self._find_file()
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except IOError as e:
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raise ConfigFileNotFound(str(e))
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self._read_file_as_dict()
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self._convert_to_config()
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return self.config
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def _find_file(self):
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"""Try to find the file by searching the paths."""
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self.full_filename = filefind(self.filename, self.path)
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def _read_file_as_dict(self):
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"""Load the config file into self.config, with recursive loading."""
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# This closure is made available in the namespace that is used
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# to exec the config file. It allows users to call
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# load_subconfig('myconfig.py') to load config files recursively.
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# It needs to be a closure because it has references to self.path
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# and self.config. The sub-config is loaded with the same path
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# as the parent, but it uses an empty config which is then merged
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# with the parents.
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# If a profile is specified, the config file will be loaded
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# from that profile
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def load_subconfig(fname, profile=None):
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# import here to prevent circular imports
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from IPython.core.profiledir import ProfileDir, ProfileDirError
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if profile is not None:
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try:
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profile_dir = ProfileDir.find_profile_dir_by_name(
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get_ipython_dir(),
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profile,
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)
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except ProfileDirError:
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return
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path = profile_dir.location
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else:
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path = self.path
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loader = PyFileConfigLoader(fname, path)
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try:
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sub_config = loader.load_config()
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except ConfigFileNotFound:
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# Pass silently if the sub config is not there. This happens
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# when a user s using a profile, but not the default config.
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pass
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else:
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self.config._merge(sub_config)
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# Again, this needs to be a closure and should be used in config
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# files to get the config being loaded.
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def get_config():
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return self.config
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namespace = dict(load_subconfig=load_subconfig, get_config=get_config)
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fs_encoding = sys.getfilesystemencoding() or 'ascii'
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conf_filename = self.full_filename.encode(fs_encoding)
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py3compat.execfile(conf_filename, namespace)
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def _convert_to_config(self):
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if self.data is None:
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ConfigLoaderError('self.data does not exist')
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class CommandLineConfigLoader(ConfigLoader):
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"""A config loader for command line arguments.
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As we add more command line based loaders, the common logic should go
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here.
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"""
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def _exec_config_str(self, lhs, rhs):
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"""execute self.config.<lhs>=<rhs>
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* expands ~ with expanduser
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* tries to assign with raw exec, otherwise assigns with just the string,
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allowing `--C.a=foobar` and `--C.a="foobar"` to be equivalent. *Not*
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equivalent are `--C.a=4` and `--C.a='4'`.
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"""
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rhs = os.path.expanduser(rhs)
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exec_str = 'self.config.' + lhs + '=' + rhs
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try:
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# Try to see if regular Python syntax will work. This
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# won't handle strings as the quote marks are removed
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# by the system shell.
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exec exec_str in locals(), globals()
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except (NameError, SyntaxError):
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# This case happens if the rhs is a string but without
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# the quote marks. Use repr, to get quote marks, and
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# 'u' prefix and see if
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# it succeeds. If it still fails, we let it raise.
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exec_str = u'self.config.' + lhs + '= rhs'
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exec exec_str in locals(), globals()
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def _load_flag(self, cfg):
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"""update self.config from a flag, which can be a dict or Config"""
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if isinstance(cfg, (dict, Config)):
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# don't clobber whole config sections, update
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# each section from config:
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for sec,c in cfg.iteritems():
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self.config[sec].update(c)
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else:
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raise TypeError("Invalid flag: %r" % cfg)
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# raw --identifier=value pattern
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# but *also* accept '-' as wordsep, for aliases
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# accepts: --foo=a
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# --Class.trait=value
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# --alias-name=value
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# rejects: -foo=value
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# --foo
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# --Class.trait
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kv_pattern = re.compile(r'\-\-[A-Za-z][\w\-]*(\.[\w\-]+)*\=.*')
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# just flags, no assignments, with two *or one* leading '-'
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# accepts: --foo
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# -foo-bar-again
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# rejects: --anything=anything
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# --two.word
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flag_pattern = re.compile(r'\-\-?\w+[\-\w]*$')
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class KeyValueConfigLoader(CommandLineConfigLoader):
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"""A config loader that loads key value pairs from the command line.
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This allows command line options to be gives in the following form::
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ipython --profile="foo" --InteractiveShell.autocall=False
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"""
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def __init__(self, argv=None, aliases=None, flags=None):
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"""Create a key value pair config loader.
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Parameters
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----------
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argv : list
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A list that has the form of sys.argv[1:] which has unicode
|
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elements of the form u"key=value". If this is None (default),
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then sys.argv[1:] will be used.
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aliases : dict
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A dict of aliases for configurable traits.
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Keys are the short aliases, Values are the resolved trait.
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Of the form: `{'alias' : 'Configurable.trait'}`
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flags : dict
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A dict of flags, keyed by str name. Vaues can be Config objects,
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dicts, or "key=value" strings. If Config or dict, when the flag
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is triggered, The flag is loaded as `self.config.update(m)`.
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|
|
|
|
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Returns
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-------
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|
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config : Config
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The resulting Config object.
|
|
|
|
|
|
Examples
|
|
|
--------
|
|
|
|
|
|
>>> from IPython.config.loader import KeyValueConfigLoader
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>>> cl = KeyValueConfigLoader()
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|
>>> cl.load_config(["--A.name='brian'","--B.number=0"])
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|
{'A': {'name': 'brian'}, 'B': {'number': 0}}
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|
"""
|
|
|
self.clear()
|
|
|
if argv is None:
|
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|
argv = sys.argv[1:]
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|
self.argv = argv
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self.aliases = aliases or {}
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self.flags = flags or {}
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|
|
|
|
|
|
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|
def clear(self):
|
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super(KeyValueConfigLoader, self).clear()
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self.extra_args = []
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|
|
|
|
|
|
|
|
def _decode_argv(self, argv, enc=None):
|
|
|
"""decode argv if bytes, using stin.encoding, falling back on default enc"""
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|
|
uargv = []
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|
|
if enc is None:
|
|
|
enc = DEFAULT_ENCODING
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|
|
for arg in argv:
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|
|
if not isinstance(arg, unicode):
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|
# only decode if not already decoded
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|
arg = arg.decode(enc)
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uargv.append(arg)
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return uargv
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|
|
|
|
|
|
def load_config(self, argv=None, aliases=None, flags=None):
|
|
|
"""Parse the configuration and generate the Config object.
|
|
|
|
|
|
After loading, any arguments that are not key-value or
|
|
|
flags will be stored in self.extra_args - a list of
|
|
|
unparsed command-line arguments. This is used for
|
|
|
arguments such as input files or subcommands.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
argv : list, optional
|
|
|
A list that has the form of sys.argv[1:] which has unicode
|
|
|
elements of the form u"key=value". If this is None (default),
|
|
|
then self.argv will be used.
|
|
|
aliases : dict
|
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A dict of aliases for configurable traits.
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Keys are the short aliases, Values are the resolved trait.
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Of the form: `{'alias' : 'Configurable.trait'}`
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flags : dict
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A dict of flags, keyed by str name. Values can be Config objects
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or dicts. When the flag is triggered, The config is loaded as
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`self.config.update(cfg)`.
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"""
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from IPython.config.configurable import Configurable
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self.clear()
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if argv is None:
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argv = self.argv
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if aliases is None:
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aliases = self.aliases
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if flags is None:
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flags = self.flags
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# ensure argv is a list of unicode strings:
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uargv = self._decode_argv(argv)
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for idx,raw in enumerate(uargv):
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# strip leading '-'
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item = raw.lstrip('-')
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if raw == '--':
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# don't parse arguments after '--'
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# this is useful for relaying arguments to scripts, e.g.
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# ipython -i foo.py --pylab=qt -- args after '--' go-to-foo.py
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self.extra_args.extend(uargv[idx+1:])
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break
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if kv_pattern.match(raw):
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lhs,rhs = item.split('=',1)
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# Substitute longnames for aliases.
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if lhs in aliases:
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lhs = aliases[lhs]
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if '.' not in lhs:
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# probably a mistyped alias, but not technically illegal
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warn.warn("Unrecognized alias: '%s', it will probably have no effect."%lhs)
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try:
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self._exec_config_str(lhs, rhs)
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except Exception:
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raise ArgumentError("Invalid argument: '%s'" % raw)
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elif flag_pattern.match(raw):
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if item in flags:
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cfg,help = flags[item]
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self._load_flag(cfg)
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else:
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raise ArgumentError("Unrecognized flag: '%s'"%raw)
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elif raw.startswith('-'):
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kv = '--'+item
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if kv_pattern.match(kv):
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raise ArgumentError("Invalid argument: '%s', did you mean '%s'?"%(raw, kv))
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else:
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raise ArgumentError("Invalid argument: '%s'"%raw)
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else:
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# keep all args that aren't valid in a list,
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# in case our parent knows what to do with them.
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self.extra_args.append(item)
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return self.config
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class ArgParseConfigLoader(CommandLineConfigLoader):
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"""A loader that uses the argparse module to load from the command line."""
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def __init__(self, argv=None, aliases=None, flags=None, *parser_args, **parser_kw):
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"""Create a config loader for use with argparse.
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Parameters
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----------
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argv : optional, list
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If given, used to read command-line arguments from, otherwise
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sys.argv[1:] is used.
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|
|
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parser_args : tuple
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|
A tuple of positional arguments that will be passed to the
|
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constructor of :class:`argparse.ArgumentParser`.
|
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|
|
|
parser_kw : dict
|
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|
A tuple of keyword arguments that will be passed to the
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|
constructor of :class:`argparse.ArgumentParser`.
|
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|
|
|
Returns
|
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-------
|
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|
config : Config
|
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|
The resulting Config object.
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"""
|
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super(CommandLineConfigLoader, self).__init__()
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self.clear()
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|
if argv is None:
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|
argv = sys.argv[1:]
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|
self.argv = argv
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|
self.aliases = aliases or {}
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|
self.flags = flags or {}
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|
|
|
|
self.parser_args = parser_args
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|
|
self.version = parser_kw.pop("version", None)
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|
|
kwargs = dict(argument_default=argparse.SUPPRESS)
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|
|
kwargs.update(parser_kw)
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self.parser_kw = kwargs
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|
|
|
|
def load_config(self, argv=None, aliases=None, flags=None):
|
|
|
"""Parse command line arguments and return as a Config object.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
|
|
|
args : optional, list
|
|
|
If given, a list with the structure of sys.argv[1:] to parse
|
|
|
arguments from. If not given, the instance's self.argv attribute
|
|
|
(given at construction time) is used."""
|
|
|
self.clear()
|
|
|
if argv is None:
|
|
|
argv = self.argv
|
|
|
if aliases is None:
|
|
|
aliases = self.aliases
|
|
|
if flags is None:
|
|
|
flags = self.flags
|
|
|
self._create_parser(aliases, flags)
|
|
|
self._parse_args(argv)
|
|
|
self._convert_to_config()
|
|
|
return self.config
|
|
|
|
|
|
def get_extra_args(self):
|
|
|
if hasattr(self, 'extra_args'):
|
|
|
return self.extra_args
|
|
|
else:
|
|
|
return []
|
|
|
|
|
|
def _create_parser(self, aliases=None, flags=None):
|
|
|
self.parser = ArgumentParser(*self.parser_args, **self.parser_kw)
|
|
|
self._add_arguments(aliases, flags)
|
|
|
|
|
|
def _add_arguments(self, aliases=None, flags=None):
|
|
|
raise NotImplementedError("subclasses must implement _add_arguments")
|
|
|
|
|
|
def _parse_args(self, args):
|
|
|
"""self.parser->self.parsed_data"""
|
|
|
# decode sys.argv to support unicode command-line options
|
|
|
enc = DEFAULT_ENCODING
|
|
|
uargs = [py3compat.cast_unicode(a, enc) for a in args]
|
|
|
self.parsed_data, self.extra_args = self.parser.parse_known_args(uargs)
|
|
|
|
|
|
def _convert_to_config(self):
|
|
|
"""self.parsed_data->self.config"""
|
|
|
for k, v in vars(self.parsed_data).iteritems():
|
|
|
exec "self.config.%s = v"%k in locals(), globals()
|
|
|
|
|
|
class KVArgParseConfigLoader(ArgParseConfigLoader):
|
|
|
"""A config loader that loads aliases and flags with argparse,
|
|
|
but will use KVLoader for the rest. This allows better parsing
|
|
|
of common args, such as `ipython -c 'print 5'`, but still gets
|
|
|
arbitrary config with `ipython --InteractiveShell.use_readline=False`"""
|
|
|
|
|
|
def _add_arguments(self, aliases=None, flags=None):
|
|
|
self.alias_flags = {}
|
|
|
# print aliases, flags
|
|
|
if aliases is None:
|
|
|
aliases = self.aliases
|
|
|
if flags is None:
|
|
|
flags = self.flags
|
|
|
paa = self.parser.add_argument
|
|
|
for key,value in aliases.iteritems():
|
|
|
if key in flags:
|
|
|
# flags
|
|
|
nargs = '?'
|
|
|
else:
|
|
|
nargs = None
|
|
|
if len(key) is 1:
|
|
|
paa('-'+key, '--'+key, type=unicode, dest=value, nargs=nargs)
|
|
|
else:
|
|
|
paa('--'+key, type=unicode, dest=value, nargs=nargs)
|
|
|
for key, (value, help) in flags.iteritems():
|
|
|
if key in self.aliases:
|
|
|
#
|
|
|
self.alias_flags[self.aliases[key]] = value
|
|
|
continue
|
|
|
if len(key) is 1:
|
|
|
paa('-'+key, '--'+key, action='append_const', dest='_flags', const=value)
|
|
|
else:
|
|
|
paa('--'+key, action='append_const', dest='_flags', const=value)
|
|
|
|
|
|
def _convert_to_config(self):
|
|
|
"""self.parsed_data->self.config, parse unrecognized extra args via KVLoader."""
|
|
|
# remove subconfigs list from namespace before transforming the Namespace
|
|
|
if '_flags' in self.parsed_data:
|
|
|
subcs = self.parsed_data._flags
|
|
|
del self.parsed_data._flags
|
|
|
else:
|
|
|
subcs = []
|
|
|
|
|
|
for k, v in vars(self.parsed_data).iteritems():
|
|
|
if v is None:
|
|
|
# it was a flag that shares the name of an alias
|
|
|
subcs.append(self.alias_flags[k])
|
|
|
else:
|
|
|
# eval the KV assignment
|
|
|
self._exec_config_str(k, v)
|
|
|
|
|
|
for subc in subcs:
|
|
|
self._load_flag(subc)
|
|
|
|
|
|
if self.extra_args:
|
|
|
sub_parser = KeyValueConfigLoader()
|
|
|
sub_parser.load_config(self.extra_args)
|
|
|
self.config._merge(sub_parser.config)
|
|
|
self.extra_args = sub_parser.extra_args
|
|
|
|
|
|
|
|
|
def load_pyconfig_files(config_files, path):
|
|
|
"""Load multiple Python config files, merging each of them in turn.
|
|
|
|
|
|
Parameters
|
|
|
==========
|
|
|
config_files : list of str
|
|
|
List of config files names to load and merge into the config.
|
|
|
path : unicode
|
|
|
The full path to the location of the config files.
|
|
|
"""
|
|
|
config = Config()
|
|
|
for cf in config_files:
|
|
|
loader = PyFileConfigLoader(cf, path=path)
|
|
|
try:
|
|
|
next_config = loader.load_config()
|
|
|
except ConfigFileNotFound:
|
|
|
pass
|
|
|
except:
|
|
|
raise
|
|
|
else:
|
|
|
config._merge(next_config)
|
|
|
return config
|
|
|
|
