mercurial/registrar.py
author Anton Shestakov <av6@dwimlabs.net>
Sat, 18 Nov 2017 11:58:57 +0800
changeset 35088 a9454beb9dd8
parent 34896 97017508c863
child 35107 b22a0d9e0a83
permissions -rw-r--r--
context: add obsolete() method to basefilectx This method is now used in webutils.commonentry(), which adds common data items (commit hash, author, date, etc) for rendering changesets in hgweb. Usually, commonentry() is given a changectx as ctx; but in views related to files (e.g. file view, diff, annotate) it's replaced by a filectx, so the latter also needs to have obsolete() method.
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# registrar.py - utilities to register function for specific purpose
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#
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#  Copyright FUJIWARA Katsunori <foozy@lares.dti.ne.jp> and others
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from __future__ import absolute_import
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from . import (
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    configitems,
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    error,
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    pycompat,
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    util,
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)
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# unlike the other registered items, config options are neither functions or
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# classes. Registering the option is just small function call.
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#
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# We still add the official API to the registrar module for consistency with
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# the other items extensions want might to register.
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configitem = configitems.getitemregister
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class _funcregistrarbase(object):
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    """Base of decorator to register a function for specific purpose
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    This decorator stores decorated functions into own dict 'table'.
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    The least derived class can be defined by overriding 'formatdoc',
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    for example::
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        class keyword(_funcregistrarbase):
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            _docformat = ":%s: %s"
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    This should be used as below:
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        keyword = registrar.keyword()
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        @keyword('bar')
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        def barfunc(*args, **kwargs):
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            '''Explanation of bar keyword ....
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            '''
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            pass
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    In this case:
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    - 'barfunc' is stored as 'bar' in '_table' of an instance 'keyword' above
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    - 'barfunc.__doc__' becomes ":bar: Explanation of bar keyword"
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    """
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    def __init__(self, table=None):
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        if table is None:
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            self._table = {}
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        else:
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            self._table = table
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    def __call__(self, decl, *args, **kwargs):
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        return lambda func: self._doregister(func, decl, *args, **kwargs)
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    def _doregister(self, func, decl, *args, **kwargs):
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        name = self._getname(decl)
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        if name in self._table:
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            msg = 'duplicate registration for name: "%s"' % name
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            raise error.ProgrammingError(msg)
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        if func.__doc__ and not util.safehasattr(func, '_origdoc'):
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            doc = pycompat.sysbytes(func.__doc__).strip()
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            func._origdoc = doc
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            func.__doc__ = pycompat.sysstr(self._formatdoc(decl, doc))
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        self._table[name] = func
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        self._extrasetup(name, func, *args, **kwargs)
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        return func
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    def _parsefuncdecl(self, decl):
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        """Parse function declaration and return the name of function in it
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        """
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        i = decl.find('(')
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        if i >= 0:
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            return decl[:i]
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        else:
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            return decl
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    def _getname(self, decl):
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        """Return the name of the registered function from decl
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        Derived class should override this, if it allows more
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        descriptive 'decl' string than just a name.
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        """
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        return decl
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    _docformat = None
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    def _formatdoc(self, decl, doc):
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        """Return formatted document of the registered function for help
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        'doc' is '__doc__.strip()' of the registered function.
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        """
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        return self._docformat % (decl, doc)
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    def _extrasetup(self, name, func):
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        """Execute exra setup for registered function, if needed
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        """
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class command(_funcregistrarbase):
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    """Decorator to register a command function to table
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    This class receives a command table as its argument. The table should
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    be a dict.
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   111
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    The created object can be used as a decorator for adding commands to
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    that command table. This accepts multiple arguments to define a command.
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    The first argument is the command name.
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    The options argument is an iterable of tuples defining command arguments.
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    See ``mercurial.fancyopts.fancyopts()`` for the format of each tuple.
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    The synopsis argument defines a short, one line summary of how to use the
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    command. This shows up in the help output.
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    The norepo argument defines whether the command does not require a
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    local repository. Most commands operate against a repository, thus the
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    default is False.
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    The optionalrepo argument defines whether the command optionally requires
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    a local repository.
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    The inferrepo argument defines whether to try to find a repository from the
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    command line arguments. If True, arguments will be examined for potential
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    repository locations. See ``findrepo()``. If a repository is found, it
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    will be used.
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    There are three constants in the class which tells what type of the command
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    that is. That information will be helpful at various places. It will be also
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    be used to decide what level of access the command has on hidden commits.
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    The constants are:
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    unrecoverablewrite is for those write commands which can't be recovered like
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    push.
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    recoverablewrite is for write commands which can be recovered like commit.
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    readonly is for commands which are read only.
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    """
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    unrecoverablewrite = "unrecoverable"
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    recoverablewrite = "recoverable"
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    readonly = "readonly"
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    possiblecmdtypes = {unrecoverablewrite, recoverablewrite, readonly}
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    def _doregister(self, func, name, options=(), synopsis=None,
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                    norepo=False, optionalrepo=False, inferrepo=False,
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                    cmdtype=unrecoverablewrite):
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        if cmdtype not in self.possiblecmdtypes:
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            raise error.ProgrammingError("unknown cmdtype value '%s' for "
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                                         "'%s' command" % (cmdtype, name))
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        func.norepo = norepo
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        func.optionalrepo = optionalrepo
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        func.inferrepo = inferrepo
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        func.cmdtype = cmdtype
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        if synopsis:
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            self._table[name] = func, list(options), synopsis
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        else:
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            self._table[name] = func, list(options)
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        return func
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class revsetpredicate(_funcregistrarbase):
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    """Decorator to register revset predicate
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    Usage::
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        revsetpredicate = registrar.revsetpredicate()
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        @revsetpredicate('mypredicate(arg1, arg2[, arg3])')
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        def mypredicatefunc(repo, subset, x):
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            '''Explanation of this revset predicate ....
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            '''
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            pass
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    The first string argument is used also in online help.
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    Optional argument 'safe' indicates whether a predicate is safe for
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    DoS attack (False by default).
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    Optional argument 'takeorder' indicates whether a predicate function
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    takes ordering policy as the last argument.
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    Optional argument 'weight' indicates the estimated run-time cost, useful
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    for static optimization, default is 1. Higher weight means more expensive.
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    Usually, revsets that are fast and return only one revision has a weight of
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    0.5 (ex. a symbol); revsets with O(changelog) complexity and read only the
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    changelog have weight 10 (ex. author); revsets reading manifest deltas have
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    weight 30 (ex. adds); revset reading manifest contents have weight 100
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    (ex. contains). Note: those values are flexible. If the revset has a
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    same big-O time complexity as 'contains', but with a smaller constant, it
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    might have a weight of 90.
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    'revsetpredicate' instance in example above can be used to
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    decorate multiple functions.
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    Decorated functions are registered automatically at loading
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    extension, if an instance named as 'revsetpredicate' is used for
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    decorating in extension.
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    Otherwise, explicit 'revset.loadpredicate()' is needed.
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    """
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    _getname = _funcregistrarbase._parsefuncdecl
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    _docformat = "``%s``\n    %s"
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    def _extrasetup(self, name, func, safe=False, takeorder=False, weight=1):
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        func._safe = safe
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        func._takeorder = takeorder
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        func._weight = weight
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class filesetpredicate(_funcregistrarbase):
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    """Decorator to register fileset predicate
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    Usage::
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        filesetpredicate = registrar.filesetpredicate()
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        @filesetpredicate('mypredicate()')
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        def mypredicatefunc(mctx, x):
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            '''Explanation of this fileset predicate ....
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            '''
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            pass
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    The first string argument is used also in online help.
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    Optional argument 'callstatus' indicates whether a predicate
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     implies 'matchctx.status()' at runtime or not (False, by
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     default).
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    Optional argument 'callexisting' indicates whether a predicate
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    implies 'matchctx.existing()' at runtime or not (False, by
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    default).
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    'filesetpredicate' instance in example above can be used to
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    decorate multiple functions.
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    Decorated functions are registered automatically at loading
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    extension, if an instance named as 'filesetpredicate' is used for
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    decorating in extension.
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    Otherwise, explicit 'fileset.loadpredicate()' is needed.
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    """
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    _getname = _funcregistrarbase._parsefuncdecl
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    _docformat = "``%s``\n    %s"
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    def _extrasetup(self, name, func, callstatus=False, callexisting=False):
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        func._callstatus = callstatus
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        func._callexisting = callexisting
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class _templateregistrarbase(_funcregistrarbase):
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    """Base of decorator to register functions as template specific one
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    """
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    _docformat = ":%s: %s"
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class templatekeyword(_templateregistrarbase):
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    """Decorator to register template keyword
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    Usage::
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        templatekeyword = registrar.templatekeyword()
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        @templatekeyword('mykeyword')
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        def mykeywordfunc(repo, ctx, templ, cache, revcache, **args):
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            '''Explanation of this template keyword ....
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            '''
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            pass
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    The first string argument is used also in online help.
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    'templatekeyword' instance in example above can be used to
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    decorate multiple functions.
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    Decorated functions are registered automatically at loading
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    extension, if an instance named as 'templatekeyword' is used for
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    decorating in extension.
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    Otherwise, explicit 'templatekw.loadkeyword()' is needed.
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    """
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class templatefilter(_templateregistrarbase):
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    """Decorator to register template filer
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    Usage::
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        templatefilter = registrar.templatefilter()
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        @templatefilter('myfilter')
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        def myfilterfunc(text):
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            '''Explanation of this template filter ....
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            '''
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            pass
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    The first string argument is used also in online help.
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    'templatefilter' instance in example above can be used to
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    decorate multiple functions.
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    Decorated functions are registered automatically at loading
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    extension, if an instance named as 'templatefilter' is used for
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    decorating in extension.
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    Otherwise, explicit 'templatefilters.loadkeyword()' is needed.
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    """
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class templatefunc(_templateregistrarbase):
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    """Decorator to register template function
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    Usage::
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        templatefunc = registrar.templatefunc()
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        @templatefunc('myfunc(arg1, arg2[, arg3])', argspec='arg1 arg2 arg3')
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        def myfuncfunc(context, mapping, args):
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            '''Explanation of this template function ....
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            '''
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            pass
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    The first string argument is used also in online help.
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    If optional 'argspec' is defined, the function will receive 'args' as
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    a dict of named arguments. Otherwise 'args' is a list of positional
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    arguments.
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    'templatefunc' instance in example above can be used to
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    decorate multiple functions.
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    Decorated functions are registered automatically at loading
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    extension, if an instance named as 'templatefunc' is used for
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    decorating in extension.
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    Otherwise, explicit 'templater.loadfunction()' is needed.
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    """
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    _getname = _funcregistrarbase._parsefuncdecl
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   340
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   341
    def _extrasetup(self, name, func, argspec=None):
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   342
        func._argspec = argspec
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   343
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   344
class internalmerge(_funcregistrarbase):
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   345
    """Decorator to register in-process merge tool
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   346
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   347
    Usage::
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   348
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   349
        internalmerge = registrar.internalmerge()
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   350
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   351
        @internalmerge('mymerge', internalmerge.mergeonly,
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   352
                       onfailure=None, precheck=None):
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   353
        def mymergefunc(repo, mynode, orig, fcd, fco, fca,
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parents: 33132
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   354
                        toolconf, files, labels=None):
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parents: 33132
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   355
            '''Explanation of this internal merge tool ....
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   356
            '''
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parents: 33132
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   357
            return 1, False # means "conflicted", "no deletion needed"
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parents: 33132
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   358
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parents: 33132
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   359
    The first string argument is used to compose actual merge tool name,
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parents: 33132
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   360
    ":name" and "internal:name" (the latter is historical one).
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parents: 33132
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   361
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parents: 33132
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   362
    The second argument is one of merge types below:
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parents: 33132
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   363
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parents: 33132
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   364
    ========== ======== ======== =========
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parents: 33132
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   365
    merge type precheck premerge fullmerge
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parents: 33132
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   366
    ========== ======== ======== =========
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   367
    nomerge     x        x        x
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   368
    mergeonly   o        x        o
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parents: 33132
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   369
    fullmerge   o        o        o
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parents: 33132
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   370
    ========== ======== ======== =========
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parents: 33132
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   371
34436
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Saurabh Singh <singhsrb@fb.com>
parents: 34381
diff changeset
   372
    Optional argument 'onfailure' is the format of warning message
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parents: 33132
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   373
    to be used at failure of merging (target filename is specified
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parents: 33132
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   374
    at formatting). Or, None or so, if warning message should be
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parents: 33132
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   375
    suppressed.
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parents: 33132
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   376
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   377
    Optional argument 'precheck' is the function to be used
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parents: 33132
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   378
    before actual invocation of internal merge tool itself.
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parents: 33132
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   379
    It takes as same arguments as internal merge tool does, other than
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parents: 33132
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   380
    'files' and 'labels'. If it returns false value, merging is aborted
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parents: 33132
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   381
    immediately (and file is marked as "unresolved").
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parents: 33132
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   382
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parents: 33132
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   383
    'internalmerge' instance in example above can be used to
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parents: 33132
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   384
    decorate multiple functions.
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parents: 33132
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   385
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   386
    Decorated functions are registered automatically at loading
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parents: 33132
diff changeset
   387
    extension, if an instance named as 'internalmerge' is used for
50c44dee741a filemerge: move decorator definition for internal merge tools to registrar
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parents: 33132
diff changeset
   388
    decorating in extension.
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parents: 33132
diff changeset
   389
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parents: 33132
diff changeset
   390
    Otherwise, explicit 'filemerge.loadinternalmerge()' is needed.
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parents: 33132
diff changeset
   391
    """
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parents: 33132
diff changeset
   392
    _docformat = "``:%s``\n    %s"
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parents: 33132
diff changeset
   393
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parents: 33132
diff changeset
   394
    # merge type definitions:
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parents: 33132
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   395
    nomerge = None
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parents: 33132
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   396
    mergeonly = 'mergeonly'  # just the full merge, no premerge
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parents: 33132
diff changeset
   397
    fullmerge = 'fullmerge'  # both premerge and merge
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parents: 33132
diff changeset
   398
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parents: 33132
diff changeset
   399
    def _extrasetup(self, name, func, mergetype,
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parents: 33132
diff changeset
   400
                    onfailure=None, precheck=None):
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parents: 33132
diff changeset
   401
        func.mergetype = mergetype
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parents: 33132
diff changeset
   402
        func.onfailure = onfailure
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parents: 33132
diff changeset
   403
        func.precheck = precheck