# extensions.py - extension handling for mercurial

#

# Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>

#

# This software may be used and distributed according to the terms

# of the GNU General Public License, incorporated herein by reference.

from i18n import _

_extensions = {}

def find(name):

    '''return module with given extension name'''

    try:

        return _extensions[name]

    except KeyError:

        for k, v in _extensions.iteritems():

            if k.endswith('.' + name) or k.endswith('/' + name) or v == name:

                return sys.modules[v]

        raise KeyError(name)

def load(ui, name, path):

    if name in _extensions:

        return

    if path:

        # the module will be loaded in sys.modules

        # choose an unique name so that it doesn't

        # conflicts with other modules

        module_name = "hgext_%s" % name.replace('.', '_')

        mod = imp.load_source(module_name, path)

    else:

        def importh(name):

            mod = __import__(name)

            components = name.split('.')

            for comp in components[1:]:

                mod = getattr(mod, comp)

            return mod

        try:

            mod = importh("hgext.%s" % name)

        except ImportError:

            mod = importh(name)

    _extensions[name] = mod

    uisetup = getattr(mod, 'uisetup', None)

    if uisetup:

        uisetup(ui)

    reposetup = getattr(mod, 'reposetup', None)

    if reposetup:

        hg.repo_setup_hooks.append(reposetup)

    cmdtable = getattr(mod, 'cmdtable', {})

    overrides = [cmd for cmd in cmdtable if cmd in commands.table]

    if overrides:

        ui.warn(_("extension '%s' overrides commands: %s\n")

                % (name, " ".join(overrides)))

    commands.table.update(cmdtable)

def loadall(ui):

    for name, path in ui.extensions():

        try:

            load(ui, name, path)

        except (util.SignalInterrupt, KeyboardInterrupt):

            raise

        except Exception, inst:

            ui.warn(_("*** failed to import extension %s: %s\n") %

                    (name, inst))

            if ui.print_exc():

                return 1