# registrar.py - utilities to register function for specific purpose # # Copyright FUJIWARA Katsunori and others # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. from __future__ import absolute_import from . import ( configitems, error, pycompat, util, ) # unlike the other registered items, config options are neither functions or # classes. Registering the option is just small function call. # # We still add the official API to the registrar module for consistency with # the other items extensions want might to register. configitem = configitems.getitemregister class _funcregistrarbase(object): """Base of decorator to register a function for specific purpose This decorator stores decorated functions into own dict 'table'. The least derived class can be defined by overriding 'formatdoc', for example:: class keyword(_funcregistrarbase): _docformat = ":%s: %s" This should be used as below: keyword = registrar.keyword() @keyword('bar') def barfunc(*args, **kwargs): '''Explanation of bar keyword .... ''' pass In this case: - 'barfunc' is stored as 'bar' in '_table' of an instance 'keyword' above - 'barfunc.__doc__' becomes ":bar: Explanation of bar keyword" """ def __init__(self, table=None): if table is None: self._table = {} else: self._table = table def __call__(self, decl, *args, **kwargs): return lambda func: self._doregister(func, decl, *args, **kwargs) def _doregister(self, func, decl, *args, **kwargs): name = self._getname(decl) if name in self._table: msg = 'duplicate registration for name: "%s"' % name raise error.ProgrammingError(msg) if func.__doc__ and not util.safehasattr(func, '_origdoc'): doc = pycompat.sysbytes(func.__doc__).strip() func._origdoc = doc func.__doc__ = pycompat.sysstr(self._formatdoc(decl, doc)) self._table[name] = func self._extrasetup(name, func, *args, **kwargs) return func def _parsefuncdecl(self, decl): """Parse function declaration and return the name of function in it """ i = decl.find('(') if i >= 0: return decl[:i] else: return decl def _getname(self, decl): """Return the name of the registered function from decl Derived class should override this, if it allows more descriptive 'decl' string than just a name. """ return decl _docformat = None def _formatdoc(self, decl, doc): """Return formatted document of the registered function for help 'doc' is '__doc__.strip()' of the registered function. """ return self._docformat % (decl, doc) def _extrasetup(self, name, func): """Execute exra setup for registered function, if needed """ class command(_funcregistrarbase): """Decorator to register a command function to table This class receives a command table as its argument. The table should be a dict. The created object can be used as a decorator for adding commands to that command table. This accepts multiple arguments to define a command. The first argument is the command name (as bytes). The `options` keyword argument is an iterable of tuples defining command arguments. See ``mercurial.fancyopts.fancyopts()`` for the format of each tuple. The `synopsis` argument defines a short, one line summary of how to use the command. This shows up in the help output. There are three arguments that control what repository (if any) is found and passed to the decorated function: `norepo`, `optionalrepo`, and `inferrepo`. The `norepo` argument defines whether the command does not require a local repository. Most commands operate against a repository, thus the default is False. When True, no repository will be passed. The `optionalrepo` argument defines whether the command optionally requires a local repository. If no repository can be found, None will be passed to the decorated function. The `inferrepo` argument defines whether to try to find a repository from the command line arguments. If True, arguments will be examined for potential repository locations. See ``findrepo()``. If a repository is found, it will be used and passed to the decorated function. There are three constants in the class which tells what type of the command that is. That information will be helpful at various places. It will be also be used to decide what level of access the command has on hidden commits. The constants are: `unrecoverablewrite` is for those write commands which can't be recovered like push. `recoverablewrite` is for write commands which can be recovered like commit. `readonly` is for commands which are read only. The signature of the decorated function looks like this: def cmd(ui[, repo] [, ] [, ]) `repo` is required if `norepo` is False. `` are positional args (or `*args`) arguments, of non-option arguments from the command line. `` are keyword arguments (or `**options`) of option arguments from the command line. See the WritingExtensions and MercurialApi documentation for more exhaustive descriptions and examples. """ unrecoverablewrite = "unrecoverable" recoverablewrite = "recoverable" readonly = "readonly" possiblecmdtypes = {unrecoverablewrite, recoverablewrite, readonly} def _doregister(self, func, name, options=(), synopsis=None, norepo=False, optionalrepo=False, inferrepo=False, cmdtype=unrecoverablewrite): if cmdtype not in self.possiblecmdtypes: raise error.ProgrammingError("unknown cmdtype value '%s' for " "'%s' command" % (cmdtype, name)) func.norepo = norepo func.optionalrepo = optionalrepo func.inferrepo = inferrepo func.cmdtype = cmdtype if synopsis: self._table[name] = func, list(options), synopsis else: self._table[name] = func, list(options) return func class revsetpredicate(_funcregistrarbase): """Decorator to register revset predicate Usage:: revsetpredicate = registrar.revsetpredicate() @revsetpredicate('mypredicate(arg1, arg2[, arg3])') def mypredicatefunc(repo, subset, x): '''Explanation of this revset predicate .... ''' pass The first string argument is used also in online help. Optional argument 'safe' indicates whether a predicate is safe for DoS attack (False by default). Optional argument 'takeorder' indicates whether a predicate function takes ordering policy as the last argument. Optional argument 'weight' indicates the estimated run-time cost, useful for static optimization, default is 1. Higher weight means more expensive. Usually, revsets that are fast and return only one revision has a weight of 0.5 (ex. a symbol); revsets with O(changelog) complexity and read only the changelog have weight 10 (ex. author); revsets reading manifest deltas have weight 30 (ex. adds); revset reading manifest contents have weight 100 (ex. contains). Note: those values are flexible. If the revset has a same big-O time complexity as 'contains', but with a smaller constant, it might have a weight of 90. 'revsetpredicate' instance in example above can be used to decorate multiple functions. Decorated functions are registered automatically at loading extension, if an instance named as 'revsetpredicate' is used for decorating in extension. Otherwise, explicit 'revset.loadpredicate()' is needed. """ _getname = _funcregistrarbase._parsefuncdecl _docformat = "``%s``\n %s" def _extrasetup(self, name, func, safe=False, takeorder=False, weight=1): func._safe = safe func._takeorder = takeorder func._weight = weight class filesetpredicate(_funcregistrarbase): """Decorator to register fileset predicate Usage:: filesetpredicate = registrar.filesetpredicate() @filesetpredicate('mypredicate()') def mypredicatefunc(mctx, x): '''Explanation of this fileset predicate .... ''' pass The first string argument is used also in online help. Optional argument 'callstatus' indicates whether a predicate implies 'matchctx.status()' at runtime or not (False, by default). Optional argument 'callexisting' indicates whether a predicate implies 'matchctx.existing()' at runtime or not (False, by default). 'filesetpredicate' instance in example above can be used to decorate multiple functions. Decorated functions are registered automatically at loading extension, if an instance named as 'filesetpredicate' is used for decorating in extension. Otherwise, explicit 'fileset.loadpredicate()' is needed. """ _getname = _funcregistrarbase._parsefuncdecl _docformat = "``%s``\n %s" def _extrasetup(self, name, func, callstatus=False, callexisting=False): func._callstatus = callstatus func._callexisting = callexisting class _templateregistrarbase(_funcregistrarbase): """Base of decorator to register functions as template specific one """ _docformat = ":%s: %s" class templatekeyword(_templateregistrarbase): """Decorator to register template keyword Usage:: templatekeyword = registrar.templatekeyword() # new API (since Mercurial 4.6) @templatekeyword('mykeyword', requires={'repo', 'ctx'}) def mykeywordfunc(context, mapping): '''Explanation of this template keyword .... ''' pass # old API @templatekeyword('mykeyword') def mykeywordfunc(repo, ctx, templ, cache, revcache, **args): '''Explanation of this template keyword .... ''' pass The first string argument is used also in online help. Optional argument 'requires' should be a collection of resource names which the template keyword depends on. This also serves as a flag to switch to the new API. If 'requires' is unspecified, all template keywords and resources are expanded to the function arguments. 'templatekeyword' instance in example above can be used to decorate multiple functions. Decorated functions are registered automatically at loading extension, if an instance named as 'templatekeyword' is used for decorating in extension. Otherwise, explicit 'templatekw.loadkeyword()' is needed. """ def _extrasetup(self, name, func, requires=None): func._requires = requires class templatefilter(_templateregistrarbase): """Decorator to register template filer Usage:: templatefilter = registrar.templatefilter() @templatefilter('myfilter') def myfilterfunc(text): '''Explanation of this template filter .... ''' pass The first string argument is used also in online help. 'templatefilter' instance in example above can be used to decorate multiple functions. Decorated functions are registered automatically at loading extension, if an instance named as 'templatefilter' is used for decorating in extension. Otherwise, explicit 'templatefilters.loadkeyword()' is needed. """ class templatefunc(_templateregistrarbase): """Decorator to register template function Usage:: templatefunc = registrar.templatefunc() @templatefunc('myfunc(arg1, arg2[, arg3])', argspec='arg1 arg2 arg3') def myfuncfunc(context, mapping, args): '''Explanation of this template function .... ''' pass The first string argument is used also in online help. If optional 'argspec' is defined, the function will receive 'args' as a dict of named arguments. Otherwise 'args' is a list of positional arguments. 'templatefunc' instance in example above can be used to decorate multiple functions. Decorated functions are registered automatically at loading extension, if an instance named as 'templatefunc' is used for decorating in extension. Otherwise, explicit 'templatefuncs.loadfunction()' is needed. """ _getname = _funcregistrarbase._parsefuncdecl def _extrasetup(self, name, func, argspec=None): func._argspec = argspec class internalmerge(_funcregistrarbase): """Decorator to register in-process merge tool Usage:: internalmerge = registrar.internalmerge() @internalmerge('mymerge', internalmerge.mergeonly, onfailure=None, precheck=None): def mymergefunc(repo, mynode, orig, fcd, fco, fca, toolconf, files, labels=None): '''Explanation of this internal merge tool .... ''' return 1, False # means "conflicted", "no deletion needed" The first string argument is used to compose actual merge tool name, ":name" and "internal:name" (the latter is historical one). The second argument is one of merge types below: ========== ======== ======== ========= merge type precheck premerge fullmerge ========== ======== ======== ========= nomerge x x x mergeonly o x o fullmerge o o o ========== ======== ======== ========= Optional argument 'onfailure' is the format of warning message to be used at failure of merging (target filename is specified at formatting). Or, None or so, if warning message should be suppressed. Optional argument 'precheck' is the function to be used before actual invocation of internal merge tool itself. It takes as same arguments as internal merge tool does, other than 'files' and 'labels'. If it returns false value, merging is aborted immediately (and file is marked as "unresolved"). 'internalmerge' instance in example above can be used to decorate multiple functions. Decorated functions are registered automatically at loading extension, if an instance named as 'internalmerge' is used for decorating in extension. Otherwise, explicit 'filemerge.loadinternalmerge()' is needed. """ _docformat = "``:%s``\n %s" # merge type definitions: nomerge = None mergeonly = 'mergeonly' # just the full merge, no premerge fullmerge = 'fullmerge' # both premerge and merge def _extrasetup(self, name, func, mergetype, onfailure=None, precheck=None): func.mergetype = mergetype func.onfailure = onfailure func.precheck = precheck