# extensions.py - extension handling for mercurial

#

# Copyright 2005-2007 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.

import imp, os

import util, sys

from i18n import _

_extensions = {}

commandtable = {}

setuphooks = []

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):

                return v

        raise KeyError(name)

def load(ui, name, path):

    if name.startswith('hgext.'):

        shortname = name[6:]

    else:

        shortname = name

    if shortname in _extensions:

        return

    _extensions[shortname] = None

    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('.', '_')

        if os.path.isdir(path):

            # module/__init__.py style

            d, f = os.path.split(path)

            fd, fpath, desc = imp.find_module(f, [d])

            mod = imp.load_module(module_name, fd, fpath, desc)

        else:

            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[shortname] = mod

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

    if uisetup:

        uisetup(ui)

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

    if reposetup:

        setuphooks.append(reposetup)

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

    overrides = [cmd for cmd in cmdtable if cmd in commandtable]

    if overrides:

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

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

    commandtable.update(cmdtable)

def loadall(ui):

    result = ui.configitems("extensions")

    for i, (name, path) in enumerate(result):

        if path:

            path = os.path.expanduser(path)

        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