view mercurial/extensions.py @ 13750:7eb82f88e157

# User Dan Villiom Podlaski Christiansen <[e-mail]>
# Date 1289564504 -3600
# Node ID b75264c15cc888cf38c3c7b8f619801e3c2589c7
# Parent  89b2e5d940f669e590096c6be70eee61c9172fff
revsets: overload the branch() revset to also take a branch name.

This should only change semantics in the specific case of a tag/branch
conflict where the tag wasn't done on the branch with the same
name. Previously, branch(whatever) would resolve to the branch of the
tag in that case, whereas now it will resolve to the branch of the
name. The previous behaviour, while documented, seemed very
counter-intuitive to me.

An alternate approach would be to introduce a new revset such as
branchname() or namedbranch(). While this would retain backwards
compatibility, the distinction between it and branch() would not be
readily apparent to users. The most intuitive behaviour would be to
have branch(x) require 'x' to be a branch name, and something like
branchof(x) or samebranch(x) do what branch(x) currently
does. Unfortunately, our backwards compatibility guarantees prevent us
from doing that.

Please note that while 'hg tag' guards against shadowing a branch, 'hg
branch' does not. Besides, even if it did, that wouldn't solve the
issue of conversions with such tags and branches...

# 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, error
from i18n import _, gettext

_extensions = {}
_order = []
_ignore = ['hbisect', 'bookmarks']

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 _ignore:
        return None
    if shortname in _extensions:
        return _extensions[shortname]
    _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)
    return mod

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):
    '''Wrap the command named `command' in table

    Replace command in the command table with wrapper. The wrapped command will
    be inserted into the command table specified by the table argument.

    The wrapper will be called like

      wrapper(orig, *args, **kwargs)

    where orig is the original (wrapped) function, and *args, **kwargs
    are the arguments passed to it.
    '''
    assert hasattr(wrapper, '__call__')
    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):
    '''Wrap the function named funcname in container

    Replace the funcname member in the given container with the specified
    wrapper. The container is typically a module, class, or instance.

    The wrapper will be called like

      wrapper(orig, *args, **kwargs)

    where orig is the original (wrapped) function, and *args, **kwargs
    are the arguments passed to it.

    Wrapping methods of the repository object is not recommended since
    it conflicts with extensions that extend the repository by
    subclassing. All extensions that need to extend methods of
    localrepository should use this subclassing trick: namely,
    reposetup() should look like

      def reposetup(ui, repo):
          class myrepo(repo.__class__):
              def whatever(self, *args, **kwargs):
                  [...extension stuff...]
                  super(myrepo, self).whatever(*args, **kwargs)
                  [...extension stuff...]

          repo.__class__ = myrepo

    In general, combining wrapfunction() with subclassing does not
    work. Since you cannot control what other extensions are loaded by
    your end users, you should play nicely with others by using the
    subclass trick.
    '''
    assert hasattr(wrapper, '__call__')
    def wrap(*args, **kwargs):
        return wrapper(origfn, *args, **kwargs)

    origfn = getattr(container, funcname)
    assert hasattr(origfn, '__call__')
    setattr(container, funcname, wrap)
    return origfn

def _disabledpaths(strip_init=False):
    '''find paths of disabled extensions. returns a dict of {name: path}
    removes /__init__.py from packages if strip_init is True'''
    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 {}

    exts = {}
    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 strip_init:
                path = os.path.dirname(path)
        if name in exts or name in _order or name == '__init__':
            continue
        exts[name] = path
    return exts

def _disabledhelp(path):
    '''retrieve help synopsis of a disabled extension (without importing)'''
    try:
        file = open(path)
    except IOError:
        return
    else:
        doc = help.moduledoc(file)
        file.close()

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

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

    paths = _disabledpaths()
    if not paths:
        return None, 0

    exts = {}
    maxlength = 0
    for name, path in paths.iteritems():
        doc = _disabledhelp(path)
        if not doc:
            continue

        exts[name] = doc
        if len(name) > maxlength:
            maxlength = len(name)

    return exts, maxlength

def disabledext(name):
    '''find a specific disabled extension from hgext. returns desc'''
    paths = _disabledpaths()
    if name in paths:
        return _disabledhelp(paths[name])

def disabledcmd(ui, cmd, strict=False):
    '''import disabled extensions until cmd is found.
    returns (cmdname, extname, doc)'''

    paths = _disabledpaths(strip_init=True)
    if not paths:
        raise error.UnknownCommand(cmd)

    def findcmd(cmd, name, path):
        try:
            mod = loadpath(path, 'hgext.%s' % name)
        except Exception:
            return
        try:
            aliases, entry = cmdutil.findcmd(cmd,
                getattr(mod, 'cmdtable', {}), strict)
        except (error.AmbiguousCommand, error.UnknownCommand):
            return
        except Exception:
            ui.warn(_('warning: error finding commands in %s\n') % path)
            ui.traceback()
            return
        for c in aliases:
            if c.startswith(cmd):
                cmd = c
                break
        else:
            cmd = aliases[0]
        return (cmd, name, mod)

    # first, search for an extension with the same name as the command
    path = paths.pop(cmd, None)
    if path:
        ext = findcmd(cmd, cmd, path)
        if ext:
            return ext

    # otherwise, interrogate each extension until there's a match
    for name, path in paths.iteritems():
        ext = findcmd(cmd, name, path)
        if ext:
            return ext

    raise error.UnknownCommand(cmd)

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