|
|
# 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
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
from copy import deepcopy
|
|
|
import logging
|
|
|
import re
|
|
|
import sys
|
|
|
|
|
|
from IPython.config.configurable import SingletonConfigurable
|
|
|
from IPython.config.loader import (
|
|
|
KeyValueConfigLoader, PyFileConfigLoader, Config, ArgumentError
|
|
|
)
|
|
|
|
|
|
from IPython.utils.traitlets import (
|
|
|
Unicode, List, Int, Enum, Dict, Instance
|
|
|
)
|
|
|
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
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
flag_description = """
|
|
|
Flags are command-line arguments passed as '--<flag>'.
|
|
|
These take no parameters, unlike regular key-value arguments.
|
|
|
They are typically used for setting boolean flags, or enabling
|
|
|
modes that involve setting multiple options together.
|
|
|
|
|
|
Flags *always* begin with '--', never just one '-'.
|
|
|
""".strip() # trim newlines of front and back
|
|
|
|
|
|
alias_description = """
|
|
|
These are commonly set parameters, given abbreviated aliases for convenience.
|
|
|
They are set in the same `name=value` way as class parameters, where
|
|
|
<name> is replaced by the real parameter for which it is an alias.
|
|
|
""".strip() # trim newlines of front and back
|
|
|
|
|
|
keyvalue_description = """
|
|
|
Parameters are set from command-line arguments of the form:
|
|
|
`Class.trait=value`. Parameters will *never* be prefixed with '-'.
|
|
|
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
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Application class
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
class ApplicationError(Exception):
|
|
|
pass
|
|
|
|
|
|
|
|
|
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
|
|
|
flag_description = Unicode(flag_description)
|
|
|
alias_description = Unicode(alias_description)
|
|
|
keyvalue_description = Unicode(keyvalue_description)
|
|
|
|
|
|
|
|
|
# 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), default_value=logging.WARN,
|
|
|
config=True,
|
|
|
help="Set the log level.")
|
|
|
|
|
|
# the alias map for configurables
|
|
|
aliases = Dict(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)
|
|
|
# Add my class to self.classes so my attributes appear in command line
|
|
|
# options.
|
|
|
self.classes.insert(0, self.__class__)
|
|
|
|
|
|
self.init_logging()
|
|
|
|
|
|
def _config_changed(self, name, old, new):
|
|
|
SingletonConfigurable._config_changed(self, name, old, new)
|
|
|
self.log.debug('Config changed:')
|
|
|
self.log.debug(repr(new))
|
|
|
|
|
|
def init_logging(self):
|
|
|
"""Start logging for this application.
|
|
|
|
|
|
The default is to log to stdout using a StreaHandler. The log level
|
|
|
starts at loggin.WARN, but this can be adjusted by setting the
|
|
|
``log_level`` attribute.
|
|
|
"""
|
|
|
self.log = logging.getLogger(self.__class__.__name__)
|
|
|
self.log.setLevel(self.log_level)
|
|
|
self._log_handler = logging.StreamHandler()
|
|
|
self._log_formatter = logging.Formatter("[%(name)s] %(message)s")
|
|
|
self._log_handler.setFormatter(self._log_formatter)
|
|
|
self.log.addHandler(self._log_handler)
|
|
|
|
|
|
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 _log_level_changed(self, name, old, new):
|
|
|
"""Adjust the log level when log_level is set."""
|
|
|
self.log.setLevel(new)
|
|
|
|
|
|
def print_alias_help(self):
|
|
|
"""Print the alias part of the help."""
|
|
|
if not self.aliases:
|
|
|
return
|
|
|
|
|
|
lines = ['Aliases']
|
|
|
lines.append('-'*len(lines[0]))
|
|
|
lines.append('')
|
|
|
for p in wrap_paragraphs(self.alias_description):
|
|
|
lines.append(p)
|
|
|
lines.append('')
|
|
|
|
|
|
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)
|
|
|
help = help.replace(longname, "%s (%s)"%(alias, longname), 1)
|
|
|
lines.append(help)
|
|
|
lines.append('')
|
|
|
print '\n'.join(lines)
|
|
|
|
|
|
def print_flag_help(self):
|
|
|
"""Print the flag part of the help."""
|
|
|
if not self.flags:
|
|
|
return
|
|
|
|
|
|
lines = ['Flags']
|
|
|
lines.append('-'*len(lines[0]))
|
|
|
lines.append('')
|
|
|
for p in wrap_paragraphs(self.flag_description):
|
|
|
lines.append(p)
|
|
|
lines.append('')
|
|
|
|
|
|
for m, (cfg,help) in self.flags.iteritems():
|
|
|
lines.append('--'+m)
|
|
|
lines.append(indent(dedent(help.strip())))
|
|
|
lines.append('')
|
|
|
print '\n'.join(lines)
|
|
|
|
|
|
def print_subcommands(self):
|
|
|
"""Print the subcommand part of the help."""
|
|
|
if not self.subcommands:
|
|
|
return
|
|
|
|
|
|
lines = ["Subcommands"]
|
|
|
lines.append('-'*len(lines[0]))
|
|
|
for subc, (cls,help) in self.subcommands.iteritems():
|
|
|
lines.append("%s : %s"%(subc, cls))
|
|
|
if help:
|
|
|
lines.append(indent(dedent(help.strip())))
|
|
|
lines.append('')
|
|
|
print '\n'.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_flag_help()
|
|
|
self.print_alias_help()
|
|
|
|
|
|
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_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
|
|
|
|
|
|
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()
|
|
|
# and initialize subapp
|
|
|
self.subapp.initialize(argv)
|
|
|
|
|
|
def parse_command_line(self, argv=None):
|
|
|
"""Parse the command line arguments."""
|
|
|
argv = sys.argv[1:] if argv is None else argv
|
|
|
|
|
|
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)
|
|
|
|
|
|
if '-h' in argv or '--help' in argv or '--help-all' in argv:
|
|
|
self.print_description()
|
|
|
self.print_help('--help-all' in argv)
|
|
|
self.exit(0)
|
|
|
|
|
|
if '--version' in argv:
|
|
|
self.print_version()
|
|
|
self.exit(0)
|
|
|
|
|
|
loader = KeyValueConfigLoader(argv=argv, aliases=self.aliases,
|
|
|
flags=self.flags)
|
|
|
try:
|
|
|
config = loader.load_config()
|
|
|
except ArgumentError as e:
|
|
|
self.log.fatal(str(e))
|
|
|
self.print_description()
|
|
|
self.print_help()
|
|
|
self.exit(1)
|
|
|
self.update_config(config)
|
|
|
# store unparsed args in extra_args
|
|
|
self.extra_args = loader.extra_args
|
|
|
|
|
|
def load_config_file(self, filename, path=None):
|
|
|
"""Load a .py based config file by filename and path."""
|
|
|
loader = PyFileConfigLoader(filename, path=path)
|
|
|
config = loader.load_config()
|
|
|
self.update_config(config)
|
|
|
|
|
|
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)}
|
|
|
|
|
|
|
