eggs/mercurial-1.7.3-py2.6-linux-x86_64.egg/mercurial/extensions.py
author Nishanth Amuluru <nishanth@fossee.in>
Tue, 11 Jan 2011 00:23:47 +0530
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permissions -rw-r--r--
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# extensions.py - extension handling for mercurial
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#
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# Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
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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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import imp, os
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import util, cmdutil, help, error
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from i18n import _, gettext
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_extensions = {}
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_order = []
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def extensions():
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    for name in _order:
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        module = _extensions[name]
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        if module:
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            yield name, module
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def find(name):
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    '''return module with given extension name'''
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    try:
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        return _extensions[name]
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    except KeyError:
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        for k, v in _extensions.iteritems():
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            if k.endswith('.' + name) or k.endswith('/' + name):
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                return v
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        raise KeyError(name)
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def loadpath(path, module_name):
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    module_name = module_name.replace('.', '_')
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    path = util.expandpath(path)
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    if os.path.isdir(path):
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        # module/__init__.py style
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        d, f = os.path.split(path.rstrip('/'))
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        fd, fpath, desc = imp.find_module(f, [d])
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        return imp.load_module(module_name, fd, fpath, desc)
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    else:
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        return imp.load_source(module_name, path)
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def load(ui, name, path):
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    # unused ui argument kept for backwards compatibility
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    if name.startswith('hgext.') or name.startswith('hgext/'):
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        shortname = name[6:]
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    else:
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        shortname = name
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    if shortname in _extensions:
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        return _extensions[shortname]
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    _extensions[shortname] = None
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    if path:
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        # the module will be loaded in sys.modules
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        # choose an unique name so that it doesn't
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        # conflicts with other modules
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        mod = loadpath(path, 'hgext.%s' % name)
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    else:
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        def importh(name):
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            mod = __import__(name)
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            components = name.split('.')
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            for comp in components[1:]:
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                mod = getattr(mod, comp)
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            return mod
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        try:
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            mod = importh("hgext.%s" % name)
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        except ImportError:
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            mod = importh(name)
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    _extensions[shortname] = mod
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    _order.append(shortname)
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    return mod
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def loadall(ui):
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    result = ui.configitems("extensions")
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    newindex = len(_order)
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    for (name, path) in result:
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        if path:
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            if path[0] == '!':
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                continue
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        try:
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            load(ui, name, path)
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        except KeyboardInterrupt:
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            raise
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        except Exception, inst:
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            if path:
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                ui.warn(_("*** failed to import extension %s from %s: %s\n")
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                        % (name, path, inst))
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            else:
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                ui.warn(_("*** failed to import extension %s: %s\n")
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                        % (name, inst))
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            if ui.traceback():
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                return 1
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    for name in _order[newindex:]:
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        uisetup = getattr(_extensions[name], 'uisetup', None)
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        if uisetup:
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            uisetup(ui)
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    for name in _order[newindex:]:
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        extsetup = getattr(_extensions[name], 'extsetup', None)
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        if extsetup:
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            try:
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                extsetup(ui)
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            except TypeError:
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                if extsetup.func_code.co_argcount != 0:
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                    raise
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                extsetup() # old extsetup with no ui argument
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def wrapcommand(table, command, wrapper):
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    '''Wrap the command named `command' in table
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    Replace command in the command table with wrapper. The wrapped command will
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    be inserted into the command table specified by the table argument.
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    The wrapper will be called like
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      wrapper(orig, *args, **kwargs)
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    where orig is the original (wrapped) function, and *args, **kwargs
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    are the arguments passed to it.
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    '''
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    assert hasattr(wrapper, '__call__')
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    aliases, entry = cmdutil.findcmd(command, table)
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    for alias, e in table.iteritems():
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        if e is entry:
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            key = alias
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            break
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    origfn = entry[0]
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    def wrap(*args, **kwargs):
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        return util.checksignature(wrapper)(
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            util.checksignature(origfn), *args, **kwargs)
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    wrap.__doc__ = getattr(origfn, '__doc__')
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    wrap.__module__ = getattr(origfn, '__module__')
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    newentry = list(entry)
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    newentry[0] = wrap
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    table[key] = tuple(newentry)
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    return entry
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def wrapfunction(container, funcname, wrapper):
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    '''Wrap the function named funcname in container
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    Replace the funcname member in the given container with the specified
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    wrapper. The container is typically a module, class, or instance.
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    The wrapper will be called like
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      wrapper(orig, *args, **kwargs)
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    where orig is the original (wrapped) function, and *args, **kwargs
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    are the arguments passed to it.
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    Wrapping methods of the repository object is not recommended since
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    it conflicts with extensions that extend the repository by
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    subclassing. All extensions that need to extend methods of
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    localrepository should use this subclassing trick: namely,
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    reposetup() should look like
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      def reposetup(ui, repo):
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          class myrepo(repo.__class__):
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              def whatever(self, *args, **kwargs):
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                  [...extension stuff...]
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                  super(myrepo, self).whatever(*args, **kwargs)
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                  [...extension stuff...]
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          repo.__class__ = myrepo
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    In general, combining wrapfunction() with subclassing does not
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    work. Since you cannot control what other extensions are loaded by
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    your end users, you should play nicely with others by using the
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    subclass trick.
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    '''
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    assert hasattr(wrapper, '__call__')
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    def wrap(*args, **kwargs):
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        return wrapper(origfn, *args, **kwargs)
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    origfn = getattr(container, funcname)
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    assert hasattr(origfn, '__call__')
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    setattr(container, funcname, wrap)
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    return origfn
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def _disabledpaths(strip_init=False):
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    '''find paths of disabled extensions. returns a dict of {name: path}
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    removes /__init__.py from packages if strip_init is True'''
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    import hgext
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    extpath = os.path.dirname(os.path.abspath(hgext.__file__))
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    try: # might not be a filesystem path
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        files = os.listdir(extpath)
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    except OSError:
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        return {}
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    exts = {}
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    for e in files:
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        if e.endswith('.py'):
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            name = e.rsplit('.', 1)[0]
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            path = os.path.join(extpath, e)
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        else:
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            name = e
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            path = os.path.join(extpath, e, '__init__.py')
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            if not os.path.exists(path):
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                continue
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            if strip_init:
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                path = os.path.dirname(path)
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        if name in exts or name in _order or name == '__init__':
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            continue
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        exts[name] = path
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    return exts
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def _disabledhelp(path):
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    '''retrieve help synopsis of a disabled extension (without importing)'''
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    try:
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        file = open(path)
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    except IOError:
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        return
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    else:
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        doc = help.moduledoc(file)
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        file.close()
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    if doc: # extracting localized synopsis
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        return gettext(doc).splitlines()[0]
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    else:
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        return _('(no help text available)')
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def disabled():
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    '''find disabled extensions from hgext
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    returns a dict of {name: desc}, and the max name length'''
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    paths = _disabledpaths()
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    if not paths:
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        return None, 0
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    exts = {}
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    maxlength = 0
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    for name, path in paths.iteritems():
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        doc = _disabledhelp(path)
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        if not doc:
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            continue
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        exts[name] = doc
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        if len(name) > maxlength:
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            maxlength = len(name)
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    return exts, maxlength
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def disabledext(name):
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    '''find a specific disabled extension from hgext. returns desc'''
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    paths = _disabledpaths()
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    if name in paths:
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        return _disabledhelp(paths[name])
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def disabledcmd(cmd, strict=False):
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    '''import disabled extensions until cmd is found.
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    returns (cmdname, extname, doc)'''
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    paths = _disabledpaths(strip_init=True)
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   256
    if not paths:
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   257
        raise error.UnknownCommand(cmd)
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    def findcmd(cmd, name, path):
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        try:
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            mod = loadpath(path, 'hgext.%s' % name)
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   262
        except Exception:
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   263
            return
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   264
        try:
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            aliases, entry = cmdutil.findcmd(cmd,
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                getattr(mod, 'cmdtable', {}), strict)
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   267
        except (error.AmbiguousCommand, error.UnknownCommand):
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   268
            return
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        for c in aliases:
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            if c.startswith(cmd):
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                cmd = c
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                break
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        else:
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            cmd = aliases[0]
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        return (cmd, name, mod)
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    # first, search for an extension with the same name as the command
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    path = paths.pop(cmd, None)
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    if path:
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        ext = findcmd(cmd, cmd, path)
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        if ext:
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            return ext
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    # otherwise, interrogate each extension until there's a match
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    for name, path in paths.iteritems():
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        ext = findcmd(cmd, name, path)
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        if ext:
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            return ext
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    raise error.UnknownCommand(cmd)
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def enabled():
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    '''return a dict of {name: desc} of extensions, and the max name length'''
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    exts = {}
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    maxlength = 0
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    for ename, ext in extensions():
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        doc = (gettext(ext.__doc__) or _('(no help text available)'))
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        ename = ename.split('.')[-1]
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        maxlength = max(len(ename), maxlength)
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        exts[ename] = doc.splitlines()[0].strip()
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    return exts, maxlength