File: //lib/python3/dist-packages/twisted/python/__pycache__/usage.cpython-38.pyc
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twisted.python.usage is a module for parsing/handling the
command line of your program.
For information on how to use it, see
U{http://twistedmatrix.com/projects/core/documentation/howto/options.html},
or doc/core/howto/options.xhtml in your Twisted directory.
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Utility class that can corce a parameter before storing it.
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An option list parser class
C{optFlags} and C{optParameters} are lists of available parameters
which your program can handle. The difference between the two
is the 'flags' have an on(1) or off(0) state (off by default)
whereas 'parameters' have an assigned value, with an optional
default. (Compare '--verbose' and '--verbosity=2')
optFlags is assigned a list of lists. Each list represents
a flag parameter, as so::
optFlags = [['verbose', 'v', 'Makes it tell you what it doing.'],
['quiet', 'q', 'Be vewy vewy quiet.']]
As you can see, the first item is the long option name
(prefixed with '--' on the command line), followed by the
short option name (prefixed with '-'), and the description.
The description is used for the built-in handling of the
--help switch, which prints a usage summary.
C{optParameters} is much the same, except the list also contains
a default value::
optParameters = [['outfile', 'O', 'outfile.log', 'Description...']]
A coerce function can also be specified as the last element: it will be
called with the argument and should return the value that will be stored
for the option. This function can have a C{coerceDoc} attribute which
will be appended to the documentation of the option.
subCommands is a list of 4-tuples of (command name, command shortcut,
parser class, documentation). If the first non-option argument found is
one of the given command names, an instance of the given parser class is
instantiated and given the remainder of the arguments to parse and
self.opts[command] is set to the command name. For example::
subCommands = [
['inquisition', 'inquest', InquisitionOptions,
'Perform an inquisition'],
['holyquest', 'quest', HolyQuestOptions,
'Embark upon a holy quest']
]
In this case, C{"<program> holyquest --horseback --for-grail"} will cause
C{HolyQuestOptions} to be instantiated and asked to parse
C{['--horseback', '--for-grail']}. Currently, only the first sub-command
is parsed, and all options following it are passed to its parser. If a
subcommand is found, the subCommand attribute is set to its name and the
subOptions attribute is set to the Option instance that parses the
remaining options. If a subcommand is not given to parseOptions,
the subCommand attribute will be None. You can also mark one of
the subCommands to be the default::
defaultSubCommand = 'holyquest'
In this case, the subCommand attribute will never be None, and
the subOptions attribute will always be set.
If you want to handle your own options, define a method named
C{opt_paramname} that takes C{(self, option)} as arguments. C{option}
will be whatever immediately follows the parameter on the
command line. Options fully supports the mapping interface, so you
can do things like C{'self["option"] = val'} in these methods.
Shell tab-completion is supported by this class, for zsh only at present.
Zsh ships with a stub file ("completion function") which, for Twisted
commands, performs tab-completion on-the-fly using the support provided
by this class. The stub file lives in our tree at
C{twisted/python/twisted-completion.zsh}, and in the Zsh tree at
C{Completion/Unix/Command/_twisted}.
Tab-completion is based upon the contents of the optFlags and optParameters
lists. And, optionally, additional metadata may be provided by assigning a
special attribute, C{compData}, which should be an instance of
C{Completions}. See that class for details of what can and should be
included - and see the howto for additional help using these features -
including how third-parties may take advantage of tab-completion for their
own commands.
Advanced functionality is covered in the howto documentation,
available at
U{http://twistedmatrix.com/projects/core/documentation/howto/options.html},
or doc/core/howto/options.xhtml in your Twisted directory.
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@type descr: C{str}
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variable is defined, the descriptions contained here will override
those descriptions provided in the optFlags and optParameters
variables.
@type multiUse: C{list}
@ivar multiUse: ex. C{ ["foo", "bar"] }
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command line more than once. By default, options will only be completed
one time.
@type mutuallyExclusive: C{list} of C{tuple}
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cannot appear on the command line together.
@type optActions: C{dict}
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action is given. For example::
{"foo" : CompleteFiles("*.py", descr="python files"),
"bar" : CompleteList(["one", "two", "three"]),
"colors" : CompleteMultiList(["red", "green", "blue"])}
Callables may instead be given for the values in this dict. The
callable should accept no arguments, and return a C{Completer}
instance used as the action in the same way as the literal actions in
the example above.
As you can see in the example above. The "foo" option will have files
that end in .py completed when the user presses Tab. The "bar"
option will have either of the strings "one", "two", or "three"
completed when the user presses Tab.
"colors" will allow multiple arguments to be completed, separated by
commas. The possible arguments are red, green, and blue. Examples::
my_command --foo some-file.foo --colors=red,green
my_command --colors=green
my_command --colors=green,blue
Descriptions for the actions may be given with the optional C{descr}
keyword argument. This is separate from the description of the option
itself.
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"verbose" completion turned on. Turn on verbosity with this in your
~/.zshrc::
zstyle ':completion:*' verbose yes
zstyle ':completion:*:descriptions' format '%B%d%b'
@type extraActions: C{list}
@ivar extraActions: Extra arguments are those arguments typically
appearing at the end of the command-line, which are not associated
with any particular named option. That is, the arguments that are
given to the parseArgs() method of your usage.Options subclass. For
example::
[CompleteFiles(descr="file to read from"),
Completer(descr="book title")]
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"file to read from" and all file/dir names will be completed (*). The
2nd non-option argument will be described as "book title", but no
actual completion matches will be produced.
See the various C{Completer} subclasses for other types of things which
may be tab-completed (users, groups, network interfaces, etc).
Also note the C{repeat=True} flag which may be passed to any of the
C{Completer} classes. This is set to allow the C{Completer} instance
to be re-used for subsequent command-line words. See the C{Completer}
docstring for details.
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