view mercurial/extensions.py @ 10428:e553a425751d stable

convert: differentiate between IOError and OSError on commitctx()

The IOError exception is overloaded to mean 'this file was deleted in
the current commit'.  Separate the code that handles IOError and file
deletion from general OSError exceptions.  The latter are real errors,
but IOError is not always a throwable error.

This solves the accidental marking of files as 'deleted' in commits that
try to write for example in .hg/store/data revlogs that the current user
has no permission to modify (a normal OSError that should abort the
current commit).

Changed by pmezard: use getattr() to be on the safe side.

# extensions.py - extension handling for mercurial
#
# Copyright 2005-2007 Matt Mackall <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

import imp, os
import util, cmdutil, help
from i18n import _, gettext

_extensions = {}
_order = []

def extensions():
    for name in _order:
        module = _extensions[name]
        if module:
            yield name, module

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 loadpath(path, module_name):
    module_name = module_name.replace('.', '_')
    path = util.expandpath(path)
    if os.path.isdir(path):
        # module/__init__.py style
        d, f = os.path.split(path.rstrip('/'))
        fd, fpath, desc = imp.find_module(f, [d])
        return imp.load_module(module_name, fd, fpath, desc)
    else:
        return imp.load_source(module_name, path)

def load(ui, name, path):
    # unused ui argument kept for backwards compatibility
    if name.startswith('hgext.') or 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
        mod = loadpath(path, 'hgext.%s' % name)
    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
    _order.append(shortname)

def loadall(ui):
    result = ui.configitems("extensions")
    newindex = len(_order)
    for (name, path) in result:
        if path:
            if path[0] == '!':
                continue
        try:
            load(ui, name, path)
        except KeyboardInterrupt:
            raise
        except Exception, inst:
            if path:
                ui.warn(_("*** failed to import extension %s from %s: %s\n")
                        % (name, path, inst))
            else:
                ui.warn(_("*** failed to import extension %s: %s\n")
                        % (name, inst))
            if ui.traceback():
                return 1

    for name in _order[newindex:]:
        uisetup = getattr(_extensions[name], 'uisetup', None)
        if uisetup:
            uisetup(ui)

    for name in _order[newindex:]:
        extsetup = getattr(_extensions[name], 'extsetup', None)
        if extsetup:
            try:
                extsetup(ui)
            except TypeError:
                if extsetup.func_code.co_argcount != 0:
                    raise
                extsetup() # old extsetup with no ui argument

def wrapcommand(table, command, wrapper):
    aliases, entry = cmdutil.findcmd(command, table)
    for alias, e in table.iteritems():
        if e is entry:
            key = alias
            break

    origfn = entry[0]
    def wrap(*args, **kwargs):
        return util.checksignature(wrapper)(
            util.checksignature(origfn), *args, **kwargs)

    wrap.__doc__ = getattr(origfn, '__doc__')
    wrap.__module__ = getattr(origfn, '__module__')

    newentry = list(entry)
    newentry[0] = wrap
    table[key] = tuple(newentry)
    return entry

def wrapfunction(container, funcname, wrapper):
    def wrap(*args, **kwargs):
        return wrapper(origfn, *args, **kwargs)

    origfn = getattr(container, funcname)
    setattr(container, funcname, wrap)
    return origfn

def disabled():
    '''find disabled extensions from hgext
    returns a dict of {name: desc}, and the max name length'''

    import hgext
    extpath = os.path.dirname(os.path.abspath(hgext.__file__))

    try: # might not be a filesystem path
        files = os.listdir(extpath)
    except OSError:
        return None, 0

    exts = {}
    maxlength = 0
    for e in files:

        if e.endswith('.py'):
            name = e.rsplit('.', 1)[0]
            path = os.path.join(extpath, e)
        else:
            name = e
            path = os.path.join(extpath, e, '__init__.py')
            if not os.path.exists(path):
                continue

        if name in exts or name in _order or name == '__init__':
            continue

        try:
            file = open(path)
        except IOError:
            continue
        else:
            doc = help.moduledoc(file)
            file.close()

        if doc: # extracting localized synopsis
            exts[name] = gettext(doc).splitlines()[0]
        else:
            exts[name] = _('(no help text available)')

        if len(name) > maxlength:
            maxlength = len(name)

    return exts, maxlength

def enabled():
    '''return a dict of {name: desc} of extensions, and the max name length'''
    exts = {}
    maxlength = 0
    for ename, ext in extensions():
        doc = (gettext(ext.__doc__) or _('(no help text available)'))
        ename = ename.split('.')[-1]
        maxlength = max(len(ename), maxlength)
        exts[ename] = doc.splitlines()[0].strip()

    return exts, maxlength