view hgext/alias.py @ 8589:3edf133dcb5a

dirstate: skip step 3 in walk if nothing new will match

nothing will ever match on match.never
nothing new will match on match.exact (all found in step 1)
nothing new will match on match.match when
  there is no pattern and
  there is no direcory in pats

# Copyright (C) 2007 Brendan Cully <[e-mail]>
# This file is published under the GNU GPL.

'''allow user-defined command aliases

To use, create entries in your hgrc of the form

[alias]
mycmd = cmd --args
'''

from mercurial.i18n import _
from mercurial import commands, cmdutil, error

cmdtable = {}

class RecursiveCommand(Exception): pass

class lazycommand(object):
    '''defer command lookup until needed, so that extensions loaded
    after alias can be aliased'''
    def __init__(self, ui, name, target):
        self._ui = ui
        self._name = name
        self._target = target
        self._cmd = None

    def __len__(self):
        self._resolve()
        return len(self._cmd)

    def __getitem__(self, key):
        self._resolve()
        return self._cmd[key]

    def __iter__(self):
        self._resolve()
        return self._cmd.__iter__()

    def _resolve(self):
        if self._cmd is not None:
            return

        try:
            self._cmd = cmdutil.findcmd(self._target, commands.table, False)[1]
            if self._cmd == self:
                raise RecursiveCommand()
            if self._target in commands.norepo.split(' '):
                commands.norepo += ' %s' % self._name
            return
        except error.UnknownCommand:
            msg = _('*** [alias] %s: command %s is unknown') % \
                  (self._name, self._target)
        except error.AmbiguousCommand:
            msg = _('*** [alias] %s: command %s is ambiguous') % \
                  (self._name, self._target)
        except RecursiveCommand:
            msg = _('*** [alias] %s: circular dependency on %s') % \
                  (self._name, self._target)
        def nocmd(*args, **opts):
            self._ui.warn(msg + '\n')
            return 1
        nocmd.__doc__ = msg
        self._cmd = (nocmd, [], '')
        commands.norepo += ' %s' % self._name

def uisetup(ui):
    for cmd, target in ui.configitems('alias'):
        if not target:
            ui.warn(_('*** [alias] %s: no definition\n') % cmd)
            continue
        args = target.split(' ', 1)
        tcmd = args.pop(0)
        if args:
            args = args[0]
            defaults = ui.config('defaults', cmd)
            if defaults:
                args = ' '.join((args, defaults))
            ui.setconfig('defaults', cmd, args)
        cmdtable[cmd] = lazycommand(ui, cmd, tcmd)