|
|
# encoding: utf-8
|
|
|
"""
|
|
|
A base class for a configurable application.
|
|
|
|
|
|
Authors:
|
|
|
|
|
|
* Brian Granger
|
|
|
* Min RK
|
|
|
"""
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Copyright (C) 2008-2011 The IPython Development Team
|
|
|
#
|
|
|
# Distributed under the terms of the BSD License. The full license is in
|
|
|
# the file COPYING, distributed as part of this software.
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Imports
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
import logging
|
|
|
import os
|
|
|
import re
|
|
|
import sys
|
|
|
from copy import deepcopy
|
|
|
from collections import defaultdict
|
|
|
|
|
|
from IPython.external.decorator import decorator
|
|
|
|
|
|
from IPython.config.configurable import SingletonConfigurable
|
|
|
from IPython.config.loader import (
|
|
|
KVArgParseConfigLoader, PyFileConfigLoader, Config, ArgumentError, ConfigFileNotFound,
|
|
|
)
|
|
|
|
|
|
from IPython.utils.traitlets import (
|
|
|
Unicode, List, Enum, Dict, Instance, TraitError
|
|
|
)
|
|
|
from IPython.utils.importstring import import_item
|
|
|
from IPython.utils.text import indent, wrap_paragraphs, dedent
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# function for re-wrapping a helpstring
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Descriptions for the various sections
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
# merge flags&aliases into options
|
|
|
option_description = """
|
|
|
Arguments that take values are actually convenience aliases to full
|
|
|
Configurables, whose aliases are listed on the help line. For more information
|
|
|
on full configurables, see '--help-all'.
|
|
|
""".strip() # trim newlines of front and back
|
|
|
|
|
|
keyvalue_description = """
|
|
|
Parameters are set from command-line arguments of the form:
|
|
|
`--Class.trait=value`.
|
|
|
This line is evaluated in Python, so simple expressions are allowed, e.g.::
|
|
|
`--C.a='range(3)'` For setting C.a=[0,1,2].
|
|
|
""".strip() # trim newlines of front and back
|
|
|
|
|
|
subcommand_description = """
|
|
|
Subcommands are launched as `{app} cmd [args]`. For information on using
|
|
|
subcommand 'cmd', do: `{app} cmd -h`.
|
|
|
""".strip().format(app=os.path.basename(sys.argv[0]))
|
|
|
# get running program name
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Application class
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
@decorator
|
|
|
def catch_config_error(method, app, *args, **kwargs):
|
|
|
"""Method decorator for catching invalid config (Trait/ArgumentErrors) during init.
|
|
|
|
|
|
On a TraitError (generally caused by bad config), this will print the trait's
|
|
|
message, and exit the app.
|
|
|
|
|
|
For use on init methods, to prevent invoking excepthook on invalid input.
|
|
|
"""
|
|
|
try:
|
|
|
return method(app, *args, **kwargs)
|
|
|
except (TraitError, ArgumentError) as e:
|
|
|
app.print_description()
|
|
|
app.print_help()
|
|
|
app.print_examples()
|
|
|
app.log.fatal("Bad config encountered during initialization:")
|
|
|
app.log.fatal(str(e))
|
|
|
app.log.debug("Config at the time: %s", app.config)
|
|
|
app.exit(1)
|
|
|
|
|
|
|
|
|
class ApplicationError(Exception):
|
|
|
pass
|
|
|
|
|
|
class LevelFormatter(logging.Formatter):
|
|
|
"""Formatter with additional `highlevel` record
|
|
|
|
|
|
This field is empty if log level is less than highlevel_limit,
|
|
|
otherwise it is formatted with self.highlevel_format.
|
|
|
|
|
|
Useful for adding 'WARNING' to warning messages,
|
|
|
without adding 'INFO' to info, etc.
|
|
|
"""
|
|
|
highlevel_limit = logging.WARN
|
|
|
highlevel_format = " %(levelname)s |"
|
|
|
|
|
|
def format(self, record):
|
|
|
if record.levelno >= self.highlevel_limit:
|
|
|
record.highlevel = self.highlevel_format % record.__dict__
|
|
|
else:
|
|
|
record.highlevel = ""
|
|
|
|
|
|
return super(LevelFormatter, self).format(record)
|
|
|
|
|
|
|
|
|
class Application(SingletonConfigurable):
|
|
|
"""A singleton application with full configuration support."""
|
|
|
|
|
|
# The name of the application, will usually match the name of the command
|
|
|
# line application
|
|
|
name = Unicode(u'application')
|
|
|
|
|
|
# The description of the application that is printed at the beginning
|
|
|
# of the help.
|
|
|
description = Unicode(u'This is an application.')
|
|
|
# default section descriptions
|
|
|
option_description = Unicode(option_description)
|
|
|
keyvalue_description = Unicode(keyvalue_description)
|
|
|
subcommand_description = Unicode(subcommand_description)
|
|
|
|
|
|
# The usage and example string that goes at the end of the help string.
|
|
|
examples = Unicode()
|
|
|
|
|
|
# A sequence of Configurable subclasses whose config=True attributes will
|
|
|
# be exposed at the command line.
|
|
|
classes = List([])
|
|
|
|
|
|
# The version string of this application.
|
|
|
version = Unicode(u'0.0')
|
|
|
|
|
|
# The log level for the application
|
|
|
log_level = Enum((0,10,20,30,40,50,'DEBUG','INFO','WARN','ERROR','CRITICAL'),
|
|
|
default_value=logging.WARN,
|
|
|
config=True,
|
|
|
help="Set the log level by value or name.")
|
|
|
def _log_level_changed(self, name, old, new):
|
|
|
"""Adjust the log level when log_level is set."""
|
|
|
if isinstance(new, basestring):
|
|
|
new = getattr(logging, new)
|
|
|
self.log_level = new
|
|
|
self.log.setLevel(new)
|
|
|
|
|
|
log_datefmt = Unicode("%Y-%m-%d %H:%M:%S", config=True,
|
|
|
help="The date format used by logging formatters for %(asctime)s"
|
|
|
)
|
|
|
def _log_datefmt_changed(self, name, old, new):
|
|
|
self._log_format_changed()
|
|
|
|
|
|
log_format = Unicode("[%(name)s]%(highlevel)s %(message)s", config=True,
|
|
|
help="The Logging format template",
|
|
|
)
|
|
|
def _log_format_changed(self, name, old, new):
|
|
|
"""Change the log formatter when log_format is set."""
|
|
|
_log_handler = self.log.handlers[0]
|
|
|
_log_formatter = LevelFormatter(new, datefmt=self.log_datefmt)
|
|
|
_log_handler.setFormatter(_log_formatter)
|
|
|
|
|
|
log = Instance(logging.Logger)
|
|
|
def _log_default(self):
|
|
|
"""Start logging for this application.
|
|
|
|
|
|
The default is to log to stderr using a StreamHandler, if no default
|
|
|
handler already exists. The log level starts at logging.WARN, but this
|
|
|
can be adjusted by setting the ``log_level`` attribute.
|
|
|
"""
|
|
|
log = logging.getLogger(self.__class__.__name__)
|
|
|
log.setLevel(self.log_level)
|
|
|
log.propagate = False
|
|
|
_log = log # copied from Logger.hasHandlers() (new in Python 3.2)
|
|
|
while _log:
|
|
|
if _log.handlers:
|
|
|
return log
|
|
|
if not _log.propagate:
|
|
|
break
|
|
|
else:
|
|
|
_log = _log.parent
|
|
|
if sys.executable.endswith('pythonw.exe'):
|
|
|
# this should really go to a file, but file-logging is only
|
|
|
# hooked up in parallel applications
|
|
|
_log_handler = logging.StreamHandler(open(os.devnull, 'w'))
|
|
|
else:
|
|
|
_log_handler = logging.StreamHandler()
|
|
|
_log_formatter = LevelFormatter(self.log_format, datefmt=self.log_datefmt)
|
|
|
_log_handler.setFormatter(_log_formatter)
|
|
|
log.addHandler(_log_handler)
|
|
|
return log
|
|
|
|
|
|
# the alias map for configurables
|
|
|
aliases = Dict({'log-level' : 'Application.log_level'})
|
|
|
|
|
|
# flags for loading Configurables or store_const style flags
|
|
|
# flags are loaded from this dict by '--key' flags
|
|
|
# this must be a dict of two-tuples, the first element being the Config/dict
|
|
|
# and the second being the help string for the flag
|
|
|
flags = Dict()
|
|
|
def _flags_changed(self, name, old, new):
|
|
|
"""ensure flags dict is valid"""
|
|
|
for key,value in new.iteritems():
|
|
|
assert len(value) == 2, "Bad flag: %r:%s"%(key,value)
|
|
|
assert isinstance(value[0], (dict, Config)), "Bad flag: %r:%s"%(key,value)
|
|
|
assert isinstance(value[1], basestring), "Bad flag: %r:%s"%(key,value)
|
|
|
|
|
|
|
|
|
# subcommands for launching other applications
|
|
|
# if this is not empty, this will be a parent Application
|
|
|
# this must be a dict of two-tuples,
|
|
|
# the first element being the application class/import string
|
|
|
# and the second being the help string for the subcommand
|
|
|
subcommands = Dict()
|
|
|
# parse_command_line will initialize a subapp, if requested
|
|
|
subapp = Instance('IPython.config.application.Application', allow_none=True)
|
|
|
|
|
|
# extra command-line arguments that don't set config values
|
|
|
extra_args = List(Unicode)
|
|
|
|
|
|
|
|
|
def __init__(self, **kwargs):
|
|
|
SingletonConfigurable.__init__(self, **kwargs)
|
|
|
# Ensure my class is in self.classes, so my attributes appear in command line
|
|
|
# options and config files.
|
|
|
if self.__class__ not in self.classes:
|
|
|
self.classes.insert(0, self.__class__)
|
|
|
|
|
|
def _config_changed(self, name, old, new):
|
|
|
SingletonConfigurable._config_changed(self, name, old, new)
|
|
|
self.log.debug('Config changed:')
|
|
|
self.log.debug(repr(new))
|
|
|
|
|
|
@catch_config_error
|
|
|
def initialize(self, argv=None):
|
|
|
"""Do the basic steps to configure me.
|
|
|
|
|
|
Override in subclasses.
|
|
|
"""
|
|
|
self.parse_command_line(argv)
|
|
|
|
|
|
|
|
|
def start(self):
|
|
|
"""Start the app mainloop.
|
|
|
|
|
|
Override in subclasses.
|
|
|
"""
|
|
|
if self.subapp is not None:
|
|
|
return self.subapp.start()
|
|
|
|
|
|
def print_alias_help(self):
|
|
|
"""Print the alias part of the help."""
|
|
|
if not self.aliases:
|
|
|
return
|
|
|
|
|
|
lines = []
|
|
|
classdict = {}
|
|
|
for cls in self.classes:
|
|
|
# include all parents (up to, but excluding Configurable) in available names
|
|
|
for c in cls.mro()[:-3]:
|
|
|
classdict[c.__name__] = c
|
|
|
|
|
|
for alias, longname in self.aliases.iteritems():
|
|
|
classname, traitname = longname.split('.',1)
|
|
|
cls = classdict[classname]
|
|
|
|
|
|
trait = cls.class_traits(config=True)[traitname]
|
|
|
help = cls.class_get_trait_help(trait).splitlines()
|
|
|
# reformat first line
|
|
|
help[0] = help[0].replace(longname, alias) + ' (%s)'%longname
|
|
|
if len(alias) == 1:
|
|
|
help[0] = help[0].replace('--%s='%alias, '-%s '%alias)
|
|
|
lines.extend(help)
|
|
|
# lines.append('')
|
|
|
print os.linesep.join(lines)
|
|
|
|
|
|
def print_flag_help(self):
|
|
|
"""Print the flag part of the help."""
|
|
|
if not self.flags:
|
|
|
return
|
|
|
|
|
|
lines = []
|
|
|
for m, (cfg,help) in self.flags.iteritems():
|
|
|
prefix = '--' if len(m) > 1 else '-'
|
|
|
lines.append(prefix+m)
|
|
|
lines.append(indent(dedent(help.strip())))
|
|
|
# lines.append('')
|
|
|
print os.linesep.join(lines)
|
|
|
|
|
|
def print_options(self):
|
|
|
if not self.flags and not self.aliases:
|
|
|
return
|
|
|
lines = ['Options']
|
|
|
lines.append('-'*len(lines[0]))
|
|
|
lines.append('')
|
|
|
for p in wrap_paragraphs(self.option_description):
|
|
|
lines.append(p)
|
|
|
lines.append('')
|
|
|
print os.linesep.join(lines)
|
|
|
self.print_flag_help()
|
|
|
self.print_alias_help()
|
|
|
print
|
|
|
|
|
|
def print_subcommands(self):
|
|
|
"""Print the subcommand part of the help."""
|
|
|
if not self.subcommands:
|
|
|
return
|
|
|
|
|
|
lines = ["Subcommands"]
|
|
|
lines.append('-'*len(lines[0]))
|
|
|
lines.append('')
|
|
|
for p in wrap_paragraphs(self.subcommand_description):
|
|
|
lines.append(p)
|
|
|
lines.append('')
|
|
|
for subc, (cls, help) in self.subcommands.iteritems():
|
|
|
lines.append(subc)
|
|
|
if help:
|
|
|
lines.append(indent(dedent(help.strip())))
|
|
|
lines.append('')
|
|
|
print os.linesep.join(lines)
|
|
|
|
|
|
def print_help(self, classes=False):
|
|
|
"""Print the help for each Configurable class in self.classes.
|
|
|
|
|
|
If classes=False (the default), only flags and aliases are printed.
|
|
|
"""
|
|
|
self.print_subcommands()
|
|
|
self.print_options()
|
|
|
|
|
|
if classes:
|
|
|
if self.classes:
|
|
|
print "Class parameters"
|
|
|
print "----------------"
|
|
|
print
|
|
|
for p in wrap_paragraphs(self.keyvalue_description):
|
|
|
print p
|
|
|
print
|
|
|
|
|
|
for cls in self.classes:
|
|
|
cls.class_print_help()
|
|
|
print
|
|
|
else:
|
|
|
print "To see all available configurables, use `--help-all`"
|
|
|
print
|
|
|
|
|
|
def print_description(self):
|
|
|
"""Print the application description."""
|
|
|
for p in wrap_paragraphs(self.description):
|
|
|
print p
|
|
|
print
|
|
|
|
|
|
def print_examples(self):
|
|
|
"""Print usage and examples.
|
|
|
|
|
|
This usage string goes at the end of the command line help string
|
|
|
and should contain examples of the application's usage.
|
|
|
"""
|
|
|
if self.examples:
|
|
|
print "Examples"
|
|
|
print "--------"
|
|
|
print
|
|
|
print indent(dedent(self.examples.strip()))
|
|
|
print
|
|
|
|
|
|
def print_version(self):
|
|
|
"""Print the version string."""
|
|
|
print self.version
|
|
|
|
|
|
def update_config(self, config):
|
|
|
"""Fire the traits events when the config is updated."""
|
|
|
# Save a copy of the current config.
|
|
|
newconfig = deepcopy(self.config)
|
|
|
# Merge the new config into the current one.
|
|
|
newconfig.merge(config)
|
|
|
# Save the combined config as self.config, which triggers the traits
|
|
|
# events.
|
|
|
self.config = newconfig
|
|
|
|
|
|
@catch_config_error
|
|
|
def initialize_subcommand(self, subc, argv=None):
|
|
|
"""Initialize a subcommand with argv."""
|
|
|
subapp,help = self.subcommands.get(subc)
|
|
|
|
|
|
if isinstance(subapp, basestring):
|
|
|
subapp = import_item(subapp)
|
|
|
|
|
|
# clear existing instances
|
|
|
self.__class__.clear_instance()
|
|
|
# instantiate
|
|
|
self.subapp = subapp.instance(config=self.config)
|
|
|
# and initialize subapp
|
|
|
self.subapp.initialize(argv)
|
|
|
|
|
|
def flatten_flags(self):
|
|
|
"""flatten flags and aliases, so cl-args override as expected.
|
|
|
|
|
|
This prevents issues such as an alias pointing to InteractiveShell,
|
|
|
but a config file setting the same trait in TerminalInteraciveShell
|
|
|
getting inappropriate priority over the command-line arg.
|
|
|
|
|
|
Only aliases with exactly one descendent in the class list
|
|
|
will be promoted.
|
|
|
|
|
|
"""
|
|
|
# build a tree of classes in our list that inherit from a particular
|
|
|
# it will be a dict by parent classname of classes in our list
|
|
|
# that are descendents
|
|
|
mro_tree = defaultdict(list)
|
|
|
for cls in self.classes:
|
|
|
clsname = cls.__name__
|
|
|
for parent in cls.mro()[1:-3]:
|
|
|
# exclude cls itself and Configurable,HasTraits,object
|
|
|
mro_tree[parent.__name__].append(clsname)
|
|
|
# flatten aliases, which have the form:
|
|
|
# { 'alias' : 'Class.trait' }
|
|
|
aliases = {}
|
|
|
for alias, cls_trait in self.aliases.iteritems():
|
|
|
cls,trait = cls_trait.split('.',1)
|
|
|
children = mro_tree[cls]
|
|
|
if len(children) == 1:
|
|
|
# exactly one descendent, promote alias
|
|
|
cls = children[0]
|
|
|
aliases[alias] = '.'.join([cls,trait])
|
|
|
|
|
|
# flatten flags, which are of the form:
|
|
|
# { 'key' : ({'Cls' : {'trait' : value}}, 'help')}
|
|
|
flags = {}
|
|
|
for key, (flagdict, help) in self.flags.iteritems():
|
|
|
newflag = {}
|
|
|
for cls, subdict in flagdict.iteritems():
|
|
|
children = mro_tree[cls]
|
|
|
# exactly one descendent, promote flag section
|
|
|
if len(children) == 1:
|
|
|
cls = children[0]
|
|
|
newflag[cls] = subdict
|
|
|
flags[key] = (newflag, help)
|
|
|
return flags, aliases
|
|
|
|
|
|
@catch_config_error
|
|
|
def parse_command_line(self, argv=None):
|
|
|
"""Parse the command line arguments."""
|
|
|
argv = sys.argv[1:] if argv is None else argv
|
|
|
|
|
|
if argv and argv[0] == 'help':
|
|
|
# turn `ipython help notebook` into `ipython notebook -h`
|
|
|
argv = argv[1:] + ['-h']
|
|
|
|
|
|
if self.subcommands and len(argv) > 0:
|
|
|
# we have subcommands, and one may have been specified
|
|
|
subc, subargv = argv[0], argv[1:]
|
|
|
if re.match(r'^\w(\-?\w)*$', subc) and subc in self.subcommands:
|
|
|
# it's a subcommand, and *not* a flag or class parameter
|
|
|
return self.initialize_subcommand(subc, subargv)
|
|
|
|
|
|
# Arguments after a '--' argument are for the script IPython may be
|
|
|
# about to run, not IPython iteslf. For arguments parsed here (help and
|
|
|
# version), we want to only search the arguments up to the first
|
|
|
# occurrence of '--', which we're calling interpreted_argv.
|
|
|
try:
|
|
|
interpreted_argv = argv[:argv.index('--')]
|
|
|
except ValueError:
|
|
|
interpreted_argv = argv
|
|
|
|
|
|
if any(x in interpreted_argv for x in ('-h', '--help-all', '--help')):
|
|
|
self.print_description()
|
|
|
self.print_help('--help-all' in interpreted_argv)
|
|
|
self.print_examples()
|
|
|
self.exit(0)
|
|
|
|
|
|
if '--version' in interpreted_argv or '-V' in interpreted_argv:
|
|
|
self.print_version()
|
|
|
self.exit(0)
|
|
|
|
|
|
# flatten flags&aliases, so cl-args get appropriate priority:
|
|
|
flags,aliases = self.flatten_flags()
|
|
|
|
|
|
loader = KVArgParseConfigLoader(argv=argv, aliases=aliases,
|
|
|
flags=flags)
|
|
|
config = loader.load_config()
|
|
|
self.update_config(config)
|
|
|
# store unparsed args in extra_args
|
|
|
self.extra_args = loader.extra_args
|
|
|
|
|
|
@catch_config_error
|
|
|
def load_config_file(self, filename, path=None):
|
|
|
"""Load a .py based config file by filename and path."""
|
|
|
loader = PyFileConfigLoader(filename, path=path)
|
|
|
try:
|
|
|
config = loader.load_config()
|
|
|
except ConfigFileNotFound:
|
|
|
# problem finding the file, raise
|
|
|
raise
|
|
|
except Exception:
|
|
|
# try to get the full filename, but it will be empty in the
|
|
|
# unlikely event that the error raised before filefind finished
|
|
|
filename = loader.full_filename or filename
|
|
|
# problem while running the file
|
|
|
self.log.error("Exception while loading config file %s",
|
|
|
filename, exc_info=True)
|
|
|
else:
|
|
|
self.log.debug("Loaded config file: %s", loader.full_filename)
|
|
|
self.update_config(config)
|
|
|
|
|
|
def generate_config_file(self):
|
|
|
"""generate default config file from Configurables"""
|
|
|
lines = ["# Configuration file for %s."%self.name]
|
|
|
lines.append('')
|
|
|
lines.append('c = get_config()')
|
|
|
lines.append('')
|
|
|
for cls in self.classes:
|
|
|
lines.append(cls.class_config_section())
|
|
|
return '\n'.join(lines)
|
|
|
|
|
|
def exit(self, exit_status=0):
|
|
|
self.log.debug("Exiting application: %s" % self.name)
|
|
|
sys.exit(exit_status)
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# utility functions, for convenience
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
def boolean_flag(name, configurable, set_help='', unset_help=''):
|
|
|
"""Helper for building basic --trait, --no-trait flags.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
|
|
|
name : str
|
|
|
The name of the flag.
|
|
|
configurable : str
|
|
|
The 'Class.trait' string of the trait to be set/unset with the flag
|
|
|
set_help : unicode
|
|
|
help string for --name flag
|
|
|
unset_help : unicode
|
|
|
help string for --no-name flag
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
|
|
|
cfg : dict
|
|
|
A dict with two keys: 'name', and 'no-name', for setting and unsetting
|
|
|
the trait, respectively.
|
|
|
"""
|
|
|
# default helpstrings
|
|
|
set_help = set_help or "set %s=True"%configurable
|
|
|
unset_help = unset_help or "set %s=False"%configurable
|
|
|
|
|
|
cls,trait = configurable.split('.')
|
|
|
|
|
|
setter = {cls : {trait : True}}
|
|
|
unsetter = {cls : {trait : False}}
|
|
|
return {name : (setter, set_help), 'no-'+name : (unsetter, unset_help)}
|
|
|
|
|
|
|
