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# Copyright (C) 2007 Brendan Cully <brendan@kublai.com>
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# This file is published under the GNU GPL.
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'''allow user-defined command aliases
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To use, create entries in your hgrc of the form
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[alias]
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mycmd = cmd --args
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'''
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from mercurial.cmdutil import findcmd, UnknownCommand, AmbiguousCommand
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from mercurial import commands
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cmdtable = {}
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class RecursiveCommand(Exception): pass
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class lazycommand(object):
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'''defer command lookup until needed, so that extensions loaded
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after alias can be aliased'''
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def __init__(self, ui, name, target):
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self._ui = ui
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self._name = name
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self._target = target
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self._cmd = None
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def __len__(self):
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self._resolve()
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return len(self._cmd)
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def __getitem__(self, key):
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self._resolve()
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return self._cmd[key]
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def __iter__(self):
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self._resolve()
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return self._cmd.__iter__()
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def _resolve(self):
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if self._cmd is not None:
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return
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try:
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self._cmd = findcmd(self._ui, self._target, commands.table)[1]
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if self._cmd == self:
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raise RecursiveCommand()
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if self._target in commands.norepo.split(' '):
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commands.norepo += ' %s' % self._name
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return
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except UnknownCommand:
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msg = '*** [alias] %s: command %s is unknown' % \
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(self._name, self._target)
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except AmbiguousCommand:
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msg = '*** [alias] %s: command %s is ambiguous' % \
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(self._name, self._target)
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except RecursiveCommand:
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msg = '*** [alias] %s: circular dependency on %s' % \
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(self._name, self._target)
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def nocmd(*args, **opts):
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self._ui.warn(msg + '\n')
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return 1
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nocmd.__doc__ = msg
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self._cmd = (nocmd, [], '')
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commands.norepo += ' %s' % self._name
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def uisetup(ui):
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for cmd, target in ui.configitems('alias'):
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if not target:
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ui.warn('*** [alias] %s: no definition\n' % cmd)
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continue
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args = target.split(' ')
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tcmd = args.pop(0)
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if args:
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ui.setconfig('defaults', cmd, ' '.join(args))
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cmdtable[cmd] = lazycommand(ui, cmd, tcmd)
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