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laydi/cfgparse.py

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Initial config parser support.
2007-02-27 17:08:22 +01:00
"""cfgparse - a powerful, extensible, and easy-to-use configuration parser.
By Dan Gass <dan.gass@gmail.com>
If you have problems with this module, please file bugs through the Source
Forge project page:
http://sourceforge.net/projects/cfgparse
"""
# @future use option note when get error
# @future print file/section/linenumber information when checks fail
# @future - check type='choice' and choices=[] one must have the other
# @future -- do we have a command line --cfgcheck option that expands all configuration and checks all possible keys?
__version__ = "1.00"
__all__ = []
__copyright__ = """
Copyright (c) 2004 by Daniel M. Gass. All rights reserved.
Copyright (c) 2001-2004 Gregory P. Ward. All rights reserved.
Copyright (c) 2002-2004 Python Software Foundation. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of the author nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""
import ConfigParser as _ConfigParser
import cStringIO
import os
import re
import sys
import textwrap
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
#
# U T I L I T Y
#
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
# <borrowed file="Lib/optparse.py" version="python2.4" modified="yes">
try:
from gettext import gettext as _
except ImportError:
_ = lambda arg: arg
class HelpFormatter:
"""
Abstract base class for formatting option help. ConfigParser
instances should use one of the HelpFormatter subclasses for
formatting help; by default IndentedHelpFormatter is used.
Instance attributes:
parser : OptionParser
the controlling OptionParser instance
indent_increment : int
the number of columns to indent per nesting level
max_help_position : int
the maximum starting column for option help text
help_position : int
the calculated starting column for option help text;
initially the same as the maximum
width : int
total number of columns for output (pass None to constructor for
this value to be taken from the $COLUMNS environment variable)
level : int
current indentation level
current_indent : int
current indentation level (in columns)
help_width : int
number of columns available for option help text (calculated)
default_tag : str
text to replace with each option's default value, "%default"
by default. Set to false value to disable default value expansion.
option_strings : { Option : str }
maps Option instances to the snippet of help text explaining
the syntax of that option, e.g. "option=VALUE"
"""
NO_DEFAULT_VALUE = "none"
def __init__(self,
indent_increment,
max_help_position,
width,
short_first):
self.parser = None
self.indent_increment = indent_increment
self.help_position = self.max_help_position = max_help_position
if width is None:
try:
width = int(os.environ['COLUMNS'])
except (KeyError, ValueError):
width = 80
width -= 2
self.width = width
self.current_indent = 0
self.level = 0
self.help_width = None # computed later
self.short_first = short_first
self.default_tag = "%default"
self.option_strings = {}
self._short_opt_fmt = "%s %s"
self._long_opt_fmt = "%s=%s"
def set_parser(self, parser):
self.parser = parser
def indent(self):
self.current_indent += self.indent_increment
self.level += 1
def dedent(self):
self.current_indent -= self.indent_increment
assert self.current_indent >= 0, "Indent decreased below 0."
self.level -= 1
def format_usage(self, usage):
raise NotImplementedError, "subclasses must implement"
def format_heading(self, heading):
raise NotImplementedError, "subclasses must implement"
def format_description(self, description):
if not description:
return ""
desc_width = self.width - self.current_indent
indent = " "*self.current_indent
return textwrap.fill(description,
desc_width,
initial_indent=indent,
subsequent_indent=indent) + "\n"
def expand_default(self, option):
if self.parser is None or not self.default_tag:
return option.help
try:
default_value = option.default
except AttributeError:
default_value = None
if default_value is NO_DEFAULT or default_value is None:
default_value = self.NO_DEFAULT_VALUE
return option.help.replace(self.default_tag, str(default_value))
def format_option(self, option):
# The help for each option consists of two parts:
# * the opt strings and metavars
# eg. ("option=VALUE")
# * the user-supplied help string
# eg. ("turn on expert mode", "read data from FILENAME")
#
# If possible, we write both of these on the same line:
# option=VALUE explanation of some option
#
# But if the opt string list is too long, we put the help
# string on a second line, indented to the same column it would
# start in if it fit on the first line.
# thisoption=WAY_TO_LONG
# explanation of the long option
result = []
opts = self.option_strings[option]
opt_width = self.help_position - self.current_indent - 2
if len(opts) > opt_width:
opts = "%*s%s\n" % (self.current_indent, "", opts)
indent_first = self.help_position
else: # start help on same line as opts
opts = "%*s%-*s " % (self.current_indent, "", opt_width, opts)
indent_first = 0
result.append(opts)
if option.help:
help_text = self.expand_default(option)
help_lines = textwrap.wrap(help_text, self.help_width)
result.append("%*s%s\n" % (indent_first, "", help_lines[0]))
result.extend(["%*s%s\n" % (self.help_position, "", line)
for line in help_lines[1:]])
elif opts[-1] != "\n":
result.append("\n")
return "".join(result)
def store_option_strings(self, parser):
self.indent()
max_len = 0
for opt in parser.option_list:
strings = self.format_option_strings(opt)
self.option_strings[opt] = strings
max_len = max(max_len, len(strings) + self.current_indent)
self.indent()
for group in parser.option_groups:
for opt in group.option_list:
strings = self.format_option_strings(opt)
self.option_strings[opt] = strings
max_len = max(max_len, len(strings) + self.current_indent)
self.dedent()
self.dedent()
self.help_position = min(max_len + 2, self.max_help_position)
self.help_width = self.width - self.help_position
def format_option_strings(self, option):
"""Return a comma-separated list of option strings & metavariables."""
metavar = option.metavar or option.dest.upper()
return '%s=%s' % (option.name,metavar)
class IndentedHelpFormatter (HelpFormatter):
"""Format help with indented section bodies.
"""
# NOTE optparse
def __init__(self,
indent_increment=2,
max_help_position=24,
width=None,
short_first=1):
HelpFormatter.__init__(
self, indent_increment, max_help_position, width, short_first)
def format_usage(self, usage):
return _("usage: %s\n") % usage
def format_heading(self, heading):
return "%*s%s:\n" % (self.current_indent, "", heading)
class TitledHelpFormatter (HelpFormatter):
"""Format help with underlined section headers.
"""
# NOTE optparse
def __init__(self,
indent_increment=0,
max_help_position=24,
width=None,
short_first=0):
HelpFormatter.__init__ (
self, indent_increment, max_help_position, width, short_first)
def format_usage(self, usage):
return "%s %s\n" % (self.format_heading(_("Usage")), usage)
def format_heading(self, heading):
return "%s\n%s\n" % (heading, "=-"[self.level] * len(heading))
SUPPRESS_HELP = "SUPPRESS"+"HELP"
NO_DEFAULT = ("NO", "DEFAULT")
def _repr(self):
return "<%s at 0x%x: %s>" % (self.__class__.__name__, id(self), self)
# </borrowed>
NOTHING_FOUND = ("NOTHING","FOUND")
def split_keys(keys):
"""Returns list of keys resulting from keys argument.
--- NO KEYS ---
>>> split_keys( None )
[]
>>> split_keys( [] )
[]
--- STRINGS ---
>>> split_keys( "key1" )
['key1']
>>> split_keys( "key1,key2" )
['key1', 'key2']
>>> split_keys( "key1.key2" )
['key1', 'key2']
>>> split_keys( "key1.key2,key3" )
['key1', 'key2', 'key3']
--- LISTS ---
>>> split_keys( ['key1'] ) # single item
['key1']
>>> split_keys( ['key1','key2'] ) # multiple items
['key1', 'key2']
--- QUOTING ---
These tests check that quotes can be used to protect '.' and ','.
>>> split_keys( "'some.key1','some,key2'" ) # single ticks work
['some.key1', 'some,key2']
>>> split_keys( '"some,key1","some.key2"' ) # double ticks work
['some,key1', 'some.key2']
>>> split_keys( '"some,key1",some.key2' ) # must quote everything
Traceback (most recent call last):
ConfigParserError: Keys not quoted properly. Quotes must surround all keys.
>>> split_keys( "some,key1,'some.key2'" ) # must quote everything
Traceback (most recent call last):
ConfigParserError: Keys not quoted properly. Quotes must surround all keys.
>>> split_keys( "key1,'some.key2'.key3" ) # must quote everything
Traceback (most recent call last):
ConfigParserError: Keys not quoted properly. Quotes must surround all keys.
>>> split_keys('DEFAULT')
[]
>>> split_keys(['DEFAULT'])
[]
"""
if (keys is None) or (keys == 'DEFAULT') or (keys == ['DEFAULT']):
return []
try:
keys = keys.replace('"',"'")
if "'" in keys:
keys = keys.strip("'").split("','")
for key in keys:
if "'" in key:
IMPROPER_QUOTES = "Keys not quoted properly. Quotes must surround all keys."
raise ConfigParserUserError(IMPROPER_QUOTES)
else:
keys = keys.replace('.',',').split(',')
except AttributeError:
pass
return keys
def join_keys(keys,sep=','):
"""
>>> join_keys(['key1'])
'key1'
>>> join_keys(['key1','key2'])
'key1,key2'
>>> join_keys(['key1','key2'],'.')
'key1.key2'
>>> join_keys(['key.1','key2'],'.')
"'key.1','key2'"
>>> join_keys(['key,1','key2'],'.')
"'key,1','key2'"
>>> join_keys([])
'DEFAULT'
"""
if not keys:
return 'DEFAULT'
mash = ''.join(keys)
if '.' in mash or ',' in mash:
quote = "'"
sep = quote + ',' + quote
return quote + sep.join(keys) + quote
return sep.join(keys)
def split_paths(paths):
"""Returns list of paths resulting from paths argument.
--- NO KEYS ---
>>> split_paths( None )
[]
>>> split_paths( [] )
[]
--- STRINGS ---
>>> split_paths( "path1" )
['path1']
>>> split_paths( os.path.pathsep.join(["path1","path2"]) )
['path1', 'path2']
>>> split_paths( "path.1,path.2" )
['path.1', 'path.2']
--- LISTS ---
>>> split_paths( ['path1'] ) # single item
['path1']
>>> split_paths( ['path1','path2'] ) # multiple items
['path1', 'path2']
"""
if paths is None:
return []
try:
return paths.replace(',',os.path.pathsep).split(os.path.pathsep)
except AttributeError:
return paths
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
#
# E X C E P T I O N S
#
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
class ConfigParserError(Exception):
"""Exception associated with the cfgparse module"""
pass
class ConfigParserAppError(Exception):
"""Exception due to application programming error"""
pass
class ConfigParserUserError(Exception):
"""Exception due to user error"""
pass
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
#
# K E Y S
#
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
class Keys(object):
"""Prioritizes and stores default configuration keys.
This class is used to store default configuration keys for an instance
of the Config class. The different sources of keys are supported (stored)
by the following methods of this class:
add_cfg_keys -- configuration file specified default keys
add_cmd_keys -- command line option keys
add_env_keys -- environment variable keys
The 'get' method returns a combined list of keys in the following order:
application keys (passed when calling 'get' method)
command line keys
environment variable keys
configuration file keys
a 'DEFAULT' key (always present)
Setup: modify os module to fake out environment variable gets
>>> _getenv = os.getenv
>>> def getenv(variable,default):
... if variable == 'VAR12':
... return 'env1,env2'
... elif variable == 'VAR3':
... return 'env3'
... elif variable == 'VAR4':
... return 'env4'
... else:
... return default
>>> os.getenv = getenv
Case 1: normal string lists of keys
>>> k = Keys()
>>> k.add_env_keys('VAR12,VAR3') # this has effect
>>> k.add_env_keys('VAR_NONE') # no effect
>>> k.add_cfg_keys('cfg1,cfg2')
>>> k.add_cmd_keys('cmd1.cmd2')
>>> k.add_env_keys('VAR12') # no effect (already read)
>>> k.get('app1,app2')
['app1', 'app2', 'cmd1', 'cmd2', 'env1', 'env2', 'env3', 'cfg1', 'cfg2', 'DEFAULT']
Case 2: extend lists using other key input flavors just to make sure each
method uses split_keys()
>>> k.add_env_keys(['VAR4']) # this has effect
>>> k.add_cfg_keys(['cfg3'])
>>> k.add_cmd_keys(['cmd3'])
>>> k.get(['app'])
['app', 'cmd1', 'cmd2', 'cmd3', 'env1', 'env2', 'env3', 'env4', 'cfg1', 'cfg2', 'cfg3', 'DEFAULT']
Teardown: restore os module
>>> os.getenv = _getenv
"""
def __init__(self):
"""Initialize Keys Instance"""
self.cmd_keys = []
self.env_keys = []
self.cfg_keys = []
self.env_vars = []
def __repr__(self):
"""Return string representation of object"""
return ','.join(self.get([]))
def add_cmd_keys(self,keys):
"""Store keys from command line interface
keys -- list of keys (typically from the command line) to store. May
be a list of keys or a string with keys separated by commas.
Use any value which evaluates False when no keys.
"""
self.cmd_keys.extend(split_keys(keys))
def add_env_keys(self,variables):
"""Store keys from invoking shell's environment variable
variable -- (string) environment variable name from which to obtain
keys to store
"""
variables = split_keys(variables)
for variable in variables:
# only add keys from shell environment variable if we haven't already
if variable not in self.env_vars:
# save key variable name so we can't add same keys twice
self.env_vars.append(variable)
# if shell environment variable has a option save it
keys = os.getenv(variable,None)
if keys is not None:
self.env_keys.extend(split_keys(keys))
def add_cfg_keys(self,keys):
"""Store keys from user's configuration file.
keys -- list of keys (from user's configuration file) to store. May
be a list of keys or a string with keys separated by comma.
Use any value which evaluates False when no keys.
"""
self.cfg_keys.extend(split_keys(keys))
def get(self,keys=None):
"""Return prioritized list of stored configuration keys
keys -- list of differentiator keys. May be a list of keys or a string
with keys separated by commas. Use any valid which evaluates
False when no keys.
"""
keys = split_keys(keys)
return (keys + self.cmd_keys + self.env_keys + self.cfg_keys +
['DEFAULT'])
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
#
# O P T I O N V A L U E
#
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
class Value(object):
"""Used to store option settings in the blended option dictionary.
Needed to be able to tie the option setting back to the configuration
file for better error reporting and for round trip get/set/write
capability."""
def __init__(self,value,parent,section_keys):
"""Initializes instance."""
self.value = value
self.parent = parent
self.section_keys = section_keys
def set(self,value):
"""Sets option setting to 'value' argument passed in.
By default configuration file parsers to do not support round trip.
If they do they should subclass Value() and override this method
"""
self.value = value
def get_roots(self):
return ["File: %s" % self.parent.get_filename(),
"Section: [%s]" % join_keys(self.section_keys,'.')]
def __str__(self):
"""Returns string representation of the setting."""
return str(self.value)
__repr__ = _repr
def get(self):
"""Returns the option setting."""
return self.value
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
#
# O P T I O N
#
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
class Option(object):
"""Options added to configuration parser are an instance of this class."""
def __init__(self,**kwargs):
"""Instance initializer.
Arguments:
kwargs -- dictionary with keys parser,name,type,default,help,check,keys,
choices (see add_option of OptionContainer)
"""
self.__dict__.update(kwargs)
if self.dest is None:
self.dest = self.name
if self.type not in self.conversions:
TYPE_DOES_NOT_EXIST = "type '%s' is not valid" % self.type
raise ConfigParserAppError(TYPE_DOES_NOT_EXIST)
# help cross reference for options partnered with OptionParser
self._help_xref = ""
self.note = None
def __str__(self):
"""Returns string representation of the option."""
return self.name
__repr__ = _repr
def add_note(self,note):
"""Adds 'note' argument text to configuration parser help text and
to error messages associated with this option."""
self.parser.add_note(note)
self.note = note
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
# Get
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
def _get(self,keys):
# Read any pending configuration files at the top level in order to
# pick up user's default keys in those files.
self.parser.parse_pending_cfg([])
keys = split_keys(keys) + self.keys
keys = self.parser.keys.get(keys)
# Get the option's dictionary from the configuration parser so that
# any pending configuration files that are needed are read.
option = self.parser.get_option_dict(self.name,keys)
# When keys are given as an argument, we don't have the constraints
# of an exact match like a section. Instead we use the default
# key list (highest priority key first) to walk the option
# dictionary. At each level of the dictionary we look for the
# highest priority key and if it exists we move down a level
# otherwise the remaining keys are checked in order of priority.
def walk_option(option):
if option.__class__ is dict:
for key in keys:
if key in option:
v = walk_option(option[key])
if v.__class__ is not dict:
return v
if isinstance(option,Value):
return option
else:
return NOTHING_FOUND
return walk_option(option)
def get(self,keys=[],errors=None):
"""Returns option value associated with 'keys' argument or options
option value using 'keys' argument (in combination with other keys).
keys -- name of keys to obtain option value from
Note:
If option is partnered with an optparse option and that option
is present, the optparse option will take priority and be returned.
"""
warnings = []
option = NOTHING_FOUND
def convert(value,option_help):
# Do conversion to the type application specified
value,warning = self.conversions[self.type](self,value)
# Do final check using application check function if supplied
if not warning and self.check is not None:
value,warning = self.check(value)
if warning:
try:
warnings.extend(option_help.get_roots())
except AttributeError:
warnings.append(option_help)
warnings.append(warning)
return value
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
# Priority 1: Get option from optparse partner (command line)
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
if self.dest in self.parser.optpar_option_partners:
option = getattr(self.parser.optparser_options,self.dest,None)
if option is None:
option = NOTHING_FOUND
else:
option = convert(option,'command line option')
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
# Priority 2: Get a default option
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
if option is NOTHING_FOUND and not warnings:
option = self._get(keys)
if option is not NOTHING_FOUND:
value = option.get()
option = convert(value,option)
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
# Priority 3: Use default specified when adding the option
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
if option is NOTHING_FOUND and not warnings:
if self.default is not NO_DEFAULT:
option = self.default
else:
warnings.append('No valid default found.')
keys = split_keys(keys) + self.keys
keys = self.parser.keys.get(keys)
warnings.append('keys=%s' % ','.join(keys))
if warnings:
lines = ['Option: %s' % self.name] + warnings
lines = '\n'.join(lines) + '\n'
if errors is not None:
errors.append(lines)
else:
# not coming back
self.parser.write_errors([lines])
return option
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
# Conversions
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
def convert_choice(self,value):
if value in self.choices:
return value,None
else:
choices = str(self.choices).strip('[]()')
warning = "Invalid choice '%s', must be one of: %s" % (value,choices)
return None,warning
def convert_complex(self,value):
try:
return complex(value),None
except ValueError:
return None,"Cannot convert '%s' to a complex number" % (value)
def convert_float(self,value):
try:
return float(value),None
except ValueError:
return None,"Cannot convert '%s' to a float" % (value)
def convert_int(self,value):
try:
return int(value),None
except ValueError:
return None,"Cannot convert '%s' to an integer" % (value)
def convert_long(self,value):
try:
return long(value),None
except ValueError:
return None,"Cannot convert '%s' to a long" % (value)
def convert_string(self,value):
try:
return str(value),None
except ValueError:
return None,"Cannot convert '%s' to a string" % (value)
def convert_nothing(self,value):
return value,None
conversions = {
'choice' : convert_choice,
'complex' : convert_complex,
'float' : convert_float,
'int' : convert_int,
'long' : convert_long,
'string' : convert_string,
None : convert_nothing,
}
def set(self,value,cfgfile=None,keys=None):
value = str(value)
if cfgfile:
if keys is not None:
keys = split_keys(keys)
else:
keys = self.keys
cfgfile.set_option(self.name,value,keys,self.help)
else:
keys = split_keys(keys) + self.keys
keys = self.parser.keys.get(keys)
option = self._get(keys)
if option is NOTHING_FOUND:
NOTHING_TO_SET = '\n'.join([
'ERROR: No option found',
'option name: %s' % self.name,
'keys: %s' % keys])
raise ConfigParserUserError(NOTHING_TO_SET)
else:
option.set(value)
cfgfile = option.parent
return cfgfile
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
#
# O P T I O N C O N T A I N E R B A S E C L A S S E S
#
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
class OptionContainer(object):
OptionClass = Option
def __init__(self,description):
self.option_list = []
self.set_description(description)
def set_description(self, description):
self.description = description
def get_description(self):
return self.description
def add_option(self,name,help=None,type=None,choices=None,dest=None,metavar=None,default=NO_DEFAULT,check=None,keys=None):
"""
name -- configuration file option name (used same as optparse)
type -- choices similar to optparse (used same as optparse)
default -- default value (used same as optparse)
help -- help string (used same as optparse)
dest -- option database attribute name (used same as optparse)
check -- check function
keys -- name of keys to obtain option from
choices -- list of choices (used same as optparse)
metavar -- FUTURE
"""
if dest is None:
dest = name
kwargs = {
'parser' : self.parser,
'name' : name,
'type' : type,
'help' : help,
'dest' : dest,
'check' : check,
'keys' : split_keys(keys),
'choices' : choices,
'metavar' : metavar,
'default' : default}
option = self.OptionClass(**kwargs)
self.parser.master_option_list.append(option)
self.parser.master_option_dict[dest] = option
self.option_list.append(option)
return option
# <borrowed file="Lib/optparse.py" version="python2.4" modified="yes">
def format_option_help(self, formatter):
if not self.option_list:
return ""
result = []
for option in self.option_list:
if not option.help == SUPPRESS_HELP:
result.append(formatter.format_option(option))
return "".join(result)
def format_description(self, formatter):
return formatter.format_description(self.get_description())
def format_help(self, formatter):
result = []
if self.description:
result.append(self.format_description(formatter))
if self.option_list:
result.append(self.format_option_help(formatter))
return "\n".join(result)
# </borrowed>
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
#
# O P T I O N G R O U P
#
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
class OptionGroup(OptionContainer):
def __init__(self,parser,title,description):
OptionContainer.__init__(self,description)
self.parser = parser
self.title = title
# <borrowed file="Lib/optparse.py" version="python2.4" modified="yes">
def set_title (self, title):
self.title = title
# -- Help-formatting methods ---------------------------------------
def format_help (self, formatter):
result = formatter.format_heading(self.title)
formatter.indent()
result += OptionContainer.format_help(self, formatter)
formatter.dedent()
return result
# </borrowed>
class ConfigFile(object):
def __init__(self,cfgfile,content,keys,parent,parser):
p,n = os.path.split(cfgfile)
try:
p = os.path.join(parent.path,p)
except AttributeError:
pass
p = os.path.abspath(p)
self.path = p
self.filename = n
self.content = content
self.underkeys = keys
self.parent = parent
self.parser = parser
self.parsed = False
def get_filename(self):
return os.path.join(self.path,self.filename)
def __str__(self):
return os.path.join(self.path,self.filename)
__repr__ = _repr
def get_as_str(self):
content = self.content
if content is None:
cfgfile = os.path.join(self.path,self.filename)
f = open(cfgfile)
content = f.read()
f.close()
else:
try:
content = self.content.read()
except AttributeError:
pass
return content
def parse_if_unparsed(self):
if not self.parsed:
# The parent is important in that it is used error messages but more
# importantly when getting ready to read a configuration script we
# must set the current directory of the parent so relative path
# specification of any configuration file works out.
try:
parent_path = self.parent.path
except AttributeError:
parent_path = os.getcwd()
# Save so we can restore after we are done
cwd = os.getcwd()
# Make sure file is present
cfgfile = os.path.join(self.path,self.filename)
if not self.content and not os.path.exists(cfgfile):
lines = ["File not found: '%s'" % cfgfile]
# remember, top level configuration file parent is just the
# current working directory when ConfigParser was instantiated
# FUTURE parent info in here too
FILE_NOT_FOUND = '\n'.join(lines)
raise ConfigParserUserError(FILE_NOT_FOUND)
# Change the current working directory to where the configuration
# script is (to accomodate Python configuraton scripts so that it
# can use os.getcwd() to determine its location).
os.chdir(self.path)
self.parse()
# Restore
os.chdir(cwd)
# Mark it as done so it isn't parsed twice
self.parsed = True
class ConfigFilePy(ConfigFile):
def parse(self):
underkeys = self.underkeys
parser = self.parser
# Parsing can be easy!
options = {}
if self.content is None:
cfgfile = os.path.join(self.path,self.filename)
execfile(cfgfile,options)
else:
exec self.get_as_str() in options
# Update the keys. "KEYS_VARIABLE" option used to specify the
# environment variable that holds additional default keys, if
# present get keys from the environment using it. If reading
# configuration file that is being included under a key, don't
# bother with its keys because it would get too confusing.
if not underkeys:
try:
parser.keys.add_env_keys(options['KEYS_VARIABLE'])
del options['KEYS_VARIABLE']
except KeyError:
pass
try:
parser.keys.add_cfg_keys(options['KEYS'])
del options['KEYS']
except KeyError:
pass
try:
CONFIG_FILES = options['CONFIG_FILES']
del options['CONFIG_FILES']
except KeyError:
CONFIG_FILES = None
def merge_option(value,section_keys):
if value.__class__ is dict:
for key in value:
merge_option(value[key],section_keys+[key])
else:
valueobj = Value(value,self,section_keys)
parser.merge_option(name,valueobj,underkeys+section_keys)
# Merge all options that don't start with "_" into the options
for name,value in options.items():
if not name.startswith('_'):
merge_option(value,[])
# Process the "CONFIG_FILES" option used to merge in configuration
# from other files. Users specify a comma separated (string)
# listing of configuration file names or a dictionary of (and
# optionally - of dictionaries of) file name strings.
def add_files(value,under):
if isinstance(value,dict):
for k,v in value.iteritems():
add_files(v,under+[k])
else:
for cf in split_paths(value):
parser.add_file(cf,keys=under,parent=self)
if CONFIG_FILES:
add_files(CONFIG_FILES,underkeys)
class ConfigFileIni(ConfigFile):
def _read(self):
try:
self._already_read
return
except AttributeError:
self._already_read = True
underkeys = self.underkeys
option_parser = self.parser
marker_fmt = '{{{%s-(?P<id>\d+)}}}'
_self = self
class BaseClass(object):
def __init__(self,matchobj):
self.text = matchobj.group('text')
self.num = len(self.objects)
self.objects.append(self)
def restore(self):
return self.text
class Line(BaseClass):
pass
class Block(BaseClass):
objects = []
find_re = re.compile('<b>(?P<text>.*?)</b>',re.DOTALL)
class Verbatim(BaseClass):
objects = []
find_re = re.compile('<v>(?P<text>.*?)</v>',re.DOTALL)
class Comment(BaseClass):
objects = []
find_re = re.compile('(?P<text>[ \t]*[#;].*)')
class OptionPair(Value):
# OptionPair must subclass Value() because it is being submitted into the
# parser options dictionary (all options in the dictionary must be a
# subclass of Value). All things equal this would subclass BaseClass()
# but it implements all that functionality anyways.
objects = []
find_re = re.compile('(?P<indent>[ \t]*)(?P<name>.+?)(?P<sep>\s*=\s*)(?P<value>.*)')
section = None
def __init__(self,matchobj):
section_keys = OptionPair.section.keys
# get the name right
name = matchobj.group('name')
self.extended_name = name
if '[' in name:
name,keys = name.strip(']').split('[')
section_keys = section_keys + split_keys(keys)
self.name = name
self.indent = matchobj.group('indent')
self.sep = matchobj.group('sep')
value = matchobj.group('value')
self.valueplus = value
try:
value = restore(Comment,value)
value = restore(Block,value)
value = restore(Verbatim,value)
self.linenum = re.findall(marker_fmt % 'Line',value)[0]
except IndexError:
self.linenum = 'new'
self.num = len(self.objects)
self.objects.append(self)
self.section = OptionPair.section
self.section.options[self.extended_name] = self
# The following are needed for Value() functionality
self.parent = _self
self.section_keys = section_keys
# self.value will be set later (can't now because value may contain
# interpolations which cannot be expanded until all options are read
# for this section
def get_roots(self):
return Value.get_roots(self) + ["Line: %s" % self.linenum]
def set(self,value):
Value.set(self,value)
value = [value]
def hit(matchobj):
value.append(matchobj.group(0))
regexp = re.compile(marker_fmt % 'Comment')
regexp.sub(hit,self.valueplus)
self.valueplus = ''.join(value)
def restore(self):
return ''.join([self.extended_name,self.sep,self.valueplus])
def expand(self,levellist=[]):
levellist = levellist + [self.name]
if len(levellist) > 10:
lines = self.get_roots()
lines.append("Interpolation: %s" % ' << '.join(levellist))
lines.append("Maximum nesting level exceeded.")
MAX_NESTING_LEVEL_EXCEEDED = '\n' + '\n'.join(lines)
raise ConfigParserUserError(MAX_NESTING_LEVEL_EXCEEDED)
try:
return self.value
except AttributeError:
pass
value = remove(Comment,self.valueplus)
value = remove(Line,value)
value = restore(Block,value.strip(' \t'))
value = remove(Line,value)
# @future [ABSPATH] value = value.replace('%(ABSPATH(','%_(ABSPATH(')
regexp = re.compile('%\((?P<name>.*?)\)s')
def hit(matchobj):
name = matchobj.group('name')
try:
return self.section.options[name].expand(levellist)
except KeyError:
try:
return Section.default.options[name].expand(levellist)
except KeyError:
lines = self.get_roots()
lines.append("Interpolation: %s" % ' << '.join(levellist+[name]))
lines.append("'%s' not found in section or in [DEFAULT]." % name)
INTERPOLATION_ERROR = '\n' + '\n'.join(lines)
raise ConfigParserUserError(INTERPOLATION_ERROR)
value = regexp.sub(hit,value)
# @future [ABSPATH] regexp = re.compile(r'%_\(ABSPATH\((.*?)\)\)s')
# def hit(matchobj):
# return os.path.abspath(matchobj.group(1))
# value = regexp.sub(hit,value)
self.value = remove(Line,restore(Verbatim,value))
return self.value
class Section(BaseClass):
objects = []
find_re = re.compile('(?P<text>\n\[(?P<name>.*?)\].*?(?=\n\[))',re.DOTALL)
default = None
def __init__(self,matchobj):
self.options = {}
name = matchobj.group('name')
self.name = name
keys = split_keys(name)
if keys == ['DEFAULT']:
keys = []
if not keys:
Section.default = self
self.keys = keys
OptionPair.section = self
self.text = collapse(OptionPair,matchobj.group(0))
self.num = len(self.objects)
self.objects.append(self)
def add_option(self,name,value,help):
if help:
helplines = textwrap.fill(help,77).split('\n')
lines = ['# %s' % line for line in helplines]
else:
lines = []
lines.append('%s = %s' % (name,value))
OptionPair.section = self
block = collapse(Comment,'\n'+'\n'.join(lines))
self.text += collapse(OptionPair,block)
option = OptionPair.objects[-1]
underkeys = _self.underkeys + option.section_keys
if not underkeys:
underkeys = ['DEFAULT']
# submit new value to parser
_self.parser.merge_option(name,option,underkeys)
return option
def collapse(SubClass,text):
marker_fmt = '{{{%s-%%d}}}' % (SubClass.__name__)
def hit(matchobj):
return marker_fmt % SubClass(matchobj).num
return SubClass.find_re.sub(hit,text)
def remove(SubClass,text):
return re.compile(marker_fmt % SubClass.__name__).sub('',text)
def restore(SubClass,text):
def hit(matchobj):
return SubClass.objects[int(matchobj.group('id'))].restore()
return re.compile(marker_fmt % SubClass.__name__).sub(hit,text)
text = self.get_as_str()
lines = []
i = 1
for line in text.split('\n'):
lines.append(line + ('{{{Line-%d}}}' % i))
i += 1
text = '\n'.join(lines)
text = '\n[DEFAULT]\n#_START_MARKER_\n%s\n[' % text
text = collapse(Block,text)
text = collapse(Verbatim,text)
text = collapse(Comment,text)
text = collapse(Section,text)
self._OptionPair = OptionPair
self._Line = Line
self._Comment = Comment
self._Block = Block
self._Verbatim = Verbatim
self._Section = Section
self._collapse = collapse
self._restore = restore
self._remove = remove
self.text = text
def parse(self):
self._read()
for option in self._OptionPair.objects:
name = option.name
underkeys = self.underkeys + option.section_keys
value = option.expand()
if name == '<include>':
for cf in split_paths(value):
self.parser.add_file(cf,keys=underkeys,parent=self)
continue
if not underkeys:
if name == '<keys>':
self.parser.keys.add_cfg_keys(split_keys(value))
continue
if name == '<keys_variable>':
self.parser.keys.add_env_keys(value)
continue
underkeys = ['DEFAULT']
# call expand method to get .value attribute set
self.parser.merge_option(name,option,underkeys)
def set_option(self,name,value,keys=None,help=None):
self._read()
value = str(value)
keys = split_keys(keys)
found = False
for option in self._OptionPair.objects:
if name==option.name and keys == option.section_keys:
option.set(value)
found = True
if not found:
Section = self._Section
for section in Section.objects:
if keys == section.keys:
found = True
section.add_option(name,value,help)
if not found:
block = '\n\n[%s]\n\n[\n' % join_keys(keys,'.')
self.text = '%s%s' % (self.text[:-2],self._collapse(Section,block))
section = self._Section.objects[-1]
section.add_option(name,value,help)
def write(self,file):
self._read()
restore = self._restore
content = self.text
content = restore(self._Section,content)
content = restore(self._OptionPair,content) + '\n'
content = restore(self._Comment,content)
content = restore(self._Block,content)
content = restore(self._Verbatim,content)
content = self._remove(self._Line,content)
content = content.split('\n#_START_MARKER_\n')[1][:-3]
try:
file.write(content)
except AttributeError:
f = open(file,'w')
f.write(content)
f.close()
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
#
# C O N F I G U R A T I O N P A R S E R
#
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
class ConfigParser(OptionContainer):
KeysClass = Keys
OptionGroupClass = OptionGroup
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
# Initializer
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
def __init__(self,description=None,allow_py=False,formatter=None,exception=False):
"""
description -- Introductory text placed above configuration option
help text.
allow_py -- Set to True to allow Python based configuraton files
to be executed. Defaults to False. Enabling this feature
poses a potential security hole for your application.
formatter -- Controls configuration option help text style. Set
to either the IndentedHelpFormatter or TitledHelpFormatter
classes found in cfgparse module (or a subclass of either).
exception -- set to True to raise ConfigParserUserError exception
when configuration error occurs (due to user error). Omitting
or setting to False will write error message to sys.stderr.
Set to an exception class to raise that exception when a user
configuration file error occurs.
"""
OptionContainer.__init__(self,description)
self.exception = exception
# Needed because shares same base class as an option group
# (option group constructor initializes parser using an arg).
self.parser = self
self.option_dicts = {}
self.option_groups = []
self.optpar_option_partners = {}
self.master_option_list = []
self.master_option_dict = {}
if formatter is None:
formatter = IndentedHelpFormatter()
self.formatter = formatter
self.formatter.set_parser(self)
self.notes = []
# Set up database of option selection keys
self.keys = self.KeysClass()
# Create database to store information on those configuration files
# to be read later (configuration files under keys are not read until
# all of the keys in which it is under are active.
self._pending = []
# Since it introduces a security risk, only allow Python based
# configuration files if application explicitly sets this True.
self.allow_python_cfg = allow_py
self.optparse_dests = {}
def add_optparse_keys_option(self,option_group,switches=('-k','--keys'),dest='cfgparse_keys',help="Comma separated list of configuration keys."):
"""Adds configuration file keys list option to optparse object."""
self.optparse_dests['keys'] = dest
option_group.add_option(dest=dest,metavar='LIST',help=help,*switches)
def add_optparse_files_option(self,option_group,switches=('--cfgfiles',),dest='cfgparse_files',help="Comma separated list of configuration files."):
"""Adds configuration file list option to optparse object."""
self.optparse_dests['files'] = dest
option_group.add_option(dest=dest,metavar='LIST',help=help,*switches)
def add_optparse_help_option(self,option_group,switches=('--cfghelp',),dest='cfgparse_help',help="Show configuration file help and exit."):
"""Adds configuration file help option to optparse object."""
self.optparse_dests['help'] = dest
option_group.add_option(dest=dest,action='store_true',help=help,*switches)
def add_env_file(self,var,keys=[]):
"""Adds configuration file specified by environment variable setting.
Arguments:
var -- name of environment variable holding configuration file name
keys -- section key list to place configuration file options settings under
"""
# Add configuration files specified by an environment variable
# if application script specified it. (Don't read right away,
# rather hold them in pending database until they are needed
# because adding options causes option_dicts to be set with a
# default for the option destination.
f = os.getenv(var,None)
if f:
f = self.add_file(cfgfile=f,keys=keys)
else:
f = None
return f
def get_option(self,dest):
"""Returns option object previously added.
Arguments:
dest -- destination attribute name of option
"""
opt = self.master_option_dict.get(dest,None)
if opt is None:
OPTION_NOT_FOUND = '\n'.join([
'ERROR: No option found',
'option dest: %s' % dest])
raise ConfigParserAppError(OPTION_NOT_FOUND)
return opt
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
# Adding Option Groups (adding options handled by base class)
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
def add_option_group(self,title,description=None):
option_group = self.OptionGroupClass(self,title,description)
self.option_groups.append(option_group)
return option_group
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
# Pending Configuration
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
def get_option_dict(self,name,keys):
self.parse_pending_cfg(keys)
return self.option_dicts.get(name,NOTHING_FOUND)
def parse_pending_cfg(self,keys=[],read_all=False):
"""
read_all -- Set to True to read all configuration files up front.
Defaults to reading "on the fly" as the configuration files are
needed."""
# Read any pending configuration files that could possibly effect the
# setting about to be retrieved. Note, it was decided that if the
# pending configuration file's under keys are all in the key list
# computed above it will be installed right away. The other
# alternative is to try retrieving the setting with the highest
# priority key alone (first reading any pending configuration files
# that are under that key), then if that fails try retrieving the
# setting with the top two highest priority keys (again first reading
# any pending configuration files that are under either or both of the
# keys), and repeating this process for each key in the list until a
# setting is found. This would have the benefit of only reading
# pending configuration files when it is absolutely necessary but at
# cost of performance and more difficult to explain how it works.
keys = split_keys(keys)
d = []
while self._pending:
underkeys,cfgfileobj = self._pending.pop(0)
underkeys = split_keys(underkeys)
parse_it = read_all
if not parse_it:
for key in underkeys:
if key not in keys:
d.append((underkeys,cfgfileobj))
break
else:
parse_it = True
if parse_it:
cfgfileobj.parse_if_unparsed()
self._pending = d
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
FileClasses = {'py' : ConfigFilePy, 'ini': ConfigFileIni, 'default' : ConfigFileIni}
def add_file(self,cfgfile=None,content=None,type=None,keys=[],parent=None):
"""
Adds configuration file to parser. Note, file is not read until parse
or get_option method is called (and even then it may not be read if any
keys in the keys list are not in the keys being used to parse).
cfgfile -- either the filename or a file stream, defaults to None (see table below)
content -- either file contents string or file stream, defaults to None (see table below)
type -- set to either 'py', 'ini', or None (default) to control file parser used.
When set to None, filename extension is used to determine parser to use. 'py'
interprets the file as Python code. Otherwise the 'ini' style parser is used.
keys -- key list that all options in the configuration file will
be placed under when the file is read.
parent -- Not intended to be used by the public
The following table summarizes the legal combinations of the cfgfile and
arguments and resulting file name and contents utilized.
cfgfile content result (when configuration is parsed)
-------- ------- -----------------------------------------------------------
filename None file is opened and contents read
stream None stream contents are read, filename is stream name attribute
filename stream stream contents are read, filename is cfgfile argument
filename string both filename and content are used as is
"""
if isinstance(cfgfile,str):
n = cfgfile
c = content
elif hasattr(cfgfile,'name'):
n = cfgfile.name
c = cfgfile
elif isinstance(content,str):
n = 'heredoc'
c = content
elif hasattr(content,'read'):
n = 'stream'
c = content
else:
ARGUMENT_CONFICT = "Illegal combination of 'cfgfile' and 'content' arguments"
raise ConfigParserAppError(ARGUMENT_CONFICT)
uk = split_keys(keys)
if type is None:
# calculate type (lower case extension)
type = os.path.splitext(n)[1][1:].lower()
if type == 'py' and not self.allow_python_cfg:
return None
FileClass = self.FileClasses.get(type)
if FileClass is None:
FileClass = self.FileClasses['default']
fileobj = FileClass(cfgfile=n,content=c,keys=uk,parent=parent,parser=self)
self._pending.append((uk,fileobj))
return fileobj
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
# Read Configuration File Utilities
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
def merge_option(self,name,value,keys):
""" Merge value (under keys) into options dictionary.
name -- option name
value -- value to assign option (may be a dictionary or a option)
keys -- list of keys to place value in options dict under
"""
# Add the option name to the key list so we can start walking at
# the top level of the options dictionary.
keys = [name] + keys
option_dicts = self.option_dicts
# Move through the options dictionary using the keys we are
# supposed to place the value under creating dictionaries and keys
# that aren't already present.
for key in keys[:-1]:
if key in option_dicts:
if option_dicts[key].__class__ is not dict:
option_dicts[key] = dict(DEFAULT=option_dicts[key])
else:
option_dicts[key]={}
option_dicts = option_dicts[key]
option_dicts[keys[-1]] = value
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
# Option Parsing (not configuration file parsing)
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
def write_errors(self,errors):
CFGPARSE_USER_ERROR = '\n' + '\n'.join(errors)
if not self.exception:
sys.stderr.write("ERROR: Configuration File Parser\n")
sys.stderr.write(CFGPARSE_USER_ERROR)
self.system_exit()
else:
if self.exception is True:
UserError = ConfigParserUserError
else:
UserError = self.exception
raise UserError(CFGPARSE_USER_ERROR)
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
# Option Parsing
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
def parse(self,optparser=None,args=None,read_all=False):
"""Partners the option parser and the configuration parser together
read_all -- Set to True to read all configuration files up front.
Defaults to reading "on the fly" as the configuration files are
needed.
"""
if optparser:
# Marry up type, help, choices attributes between option parser and
# configuration parser options.
self.marry_options(optparser)
# Parse command line arguments
options, args = optparser.parse_args(args)
self.optparser_options = options
# generate help if requested from the command line
help_dest = self.optparse_dests.get('help')
if help_dest and getattr(options,help_dest):
self.print_help()
self.system_exit()
# add command line keys
keys_dest = self.optparse_dests.get('keys')
if keys_dest:
self.keys.add_cmd_keys(getattr(options,keys_dest))
# add command line configuration files (must hold it as other configuration
# files may be pending that should be read first)
files_dest = self.optparse_dests.get('files')
if files_dest:
cfgfiles = getattr(options,files_dest)
for cf in split_paths(cfgfiles):
self.add_file(cfgfile=cf,keys=[])
else:
class ConfigOptions(object):
pass
options = ConfigOptions()
self.parse_pending_cfg([],read_all)
# Go through each option in the configuration options and add them
# to options object.
errors = []
for option in self.master_option_list:
setattr(options,option.dest,option.get(errors=errors))
if errors:
self.write_errors(errors)
if optparser:
return options, args
else:
return options
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
def marry_options(self,optparser):
# create mapping: dest -> [optpar options]
optpar_lookup = {}
for option in optparser.option_list:
if option.dest:
optpar_lookup.setdefault(option.dest,[]).append(option)
for group in optparser.option_groups:
for option in group.option_list:
if option.dest:
optpar_lookup.setdefault(option.dest,[]).append(option)
self.optpar_option_partners = optpar_lookup
# we are guarenteed no duplicate destinations with a configuration parser
for cfgpar_option in self.master_option_list:
optpar_options = optpar_lookup.get(cfgpar_option.dest,[])
for optpar_option in optpar_options:
for attrname in ['metavar','type','choices','help']:
cfgpar_attr = getattr(cfgpar_option,attrname)
optpar_attr = getattr(optpar_option,attrname)
if cfgpar_attr is None:
cfgpar_attr = optpar_attr
setattr(cfgpar_option,attrname,cfgpar_attr)
if cfgpar_option.help == SUPPRESS_HELP:
continue
try:
# remove anything we've added previously
optpar_option.help = optpar_option.help.replace(optpar_option._cfgparse_help,'')
except AttributeError:
# must not have modified it previously
pass
help = " See also '%s' option in configuration file help." % (cfgpar_option.name)
if not optpar_option.help:
help = help.strip()
optpar_option.help = ''
optpar_option.help = optpar_option.help + help
optpar_option._cfgparse_help = help
if cfgpar_option.help == SUPPRESS_HELP:
continue
if cfgpar_option.help is None:
cfgpar_option.help = ''
try:
# remove anything we've added previously
cfgpar_option.help = cfgpar_option.help.replace(cfgpar_option._help_xref,'')
except AttributeError:
# must not have modified it previously
pass
switches = '/'.join([str(o) for o in optpar_options])
if switches:
help = " See also '%s' command line switch." % (switches)
if not cfgpar_option.help:
help = help.strip()
cfgpar_option.help = cfgpar_option.help + help
cfgpar_option._help_xref = help
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
def marry_attribute(self,attrname,cfgpar_option,optpar_option):
cfgpar_attr = getattr(cfgpar_option,attrname)
optpar_attr = getattr(optpar_option,attrname)
if cfgpar_attr is None:
cfgpar_attr = optpar_attr
setattr(cfgpar_option,attrname,cfgpar_attr)
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
# Help
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
# <borrowed file="Lib/optparse.py" version="python2.4" modified="yes">
def format_option_help(self, formatter=None):
if formatter is None:
formatter = self.formatter
formatter.store_option_strings(self)
result = []
result.append(formatter.format_heading(_("Configuration file options")))
formatter.indent()
if self.option_list:
result.append(OptionContainer.format_option_help(self, formatter))
result.append("\n")
for group in self.option_groups:
result.append(group.format_help(formatter))
result.append("\n")
formatter.dedent()
# Drop the last "\n", or the header if no options or option groups:
return "".join(result[:-1])
def format_help(self, formatter=None):
if formatter is None:
formatter = self.formatter
result = []
if self.description:
result.append(self.format_description(formatter) + "\n")
result.append(self.format_option_help(formatter))
return "".join(result)
def print_help(self, file=None):
"""print_help(file : file = stdout)
Print an extended help message, listing all options and any
help text provided with them, to 'file' (default stdout).
"""
if file is None:
file = sys.stdout
file.write(self.format_help())
if self.notes:
file.write('\nNotes:\n%s\n'%'\n'.join(self.notes))
# </borrowed>
def add_note(self,note):
self.notes.append(note)
def system_exit(self):
sys.exit()
def _test():
import doctest
doctest.testmod()
if __name__ == "__main__":
_test()