annotate hgext/alias.py @ 6144:08e0825b8106

revlog.revision: avoid opening the datafile without need. If there's no inline data, revlog.revision opens the data file every time it's called. This is useful if we're going to call chunk many times, but, if we're going to call it only once, it's better to let chunk open the file - if we're lucky, all the data we're going to need is already cached and we won't need to even look at the file.
author Alexis S. L. Carvalho <alexis@cecm.usp.br>
date Tue, 19 Feb 2008 19:20:10 -0300
parents 18a9fbb5cd78
children f7d545a866e8
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1 # Copyright (C) 2007 Brendan Cully <brendan@kublai.com>
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2 # This file is published under the GNU GPL.
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3
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4 '''allow user-defined command aliases
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5
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6 To use, create entries in your hgrc of the form
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7
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8 [alias]
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9 mycmd = cmd --args
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10 '''
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11
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12 from mercurial.cmdutil import findcmd, UnknownCommand, AmbiguousCommand
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13 from mercurial import commands
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14
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15 cmdtable = {}
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16
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17 class RecursiveCommand(Exception): pass
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18
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19 class lazycommand(object):
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20 '''defer command lookup until needed, so that extensions loaded
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21 after alias can be aliased'''
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22 def __init__(self, ui, name, target):
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23 self._ui = ui
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24 self._name = name
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25 self._target = target
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26 self._cmd = None
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27
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28 def __len__(self):
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29 self._resolve()
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30 return len(self._cmd)
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31
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32 def __getitem__(self, key):
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33 self._resolve()
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34 return self._cmd[key]
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35
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36 def __iter__(self):
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37 self._resolve()
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38 return self._cmd.__iter__()
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39
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40 def _resolve(self):
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41 if self._cmd is not None:
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42 return
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43
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44 try:
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45 self._cmd = findcmd(self._ui, self._target, commands.table)[1]
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46 if self._cmd == self:
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47 raise RecursiveCommand()
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48 if self._target in commands.norepo.split(' '):
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49 commands.norepo += ' %s' % self._name
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50 return
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51 except UnknownCommand:
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52 msg = '*** [alias] %s: command %s is unknown' % \
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53 (self._name, self._target)
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54 except AmbiguousCommand:
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55 msg = '*** [alias] %s: command %s is ambiguous' % \
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56 (self._name, self._target)
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57 except RecursiveCommand:
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58 msg = '*** [alias] %s: circular dependency on %s' % \
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59 (self._name, self._target)
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60 def nocmd(*args, **opts):
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61 self._ui.warn(msg + '\n')
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62 return 1
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63 nocmd.__doc__ = msg
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64 self._cmd = (nocmd, [], '')
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65 commands.norepo += ' %s' % self._name
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66
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67 def uisetup(ui):
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68 for cmd, target in ui.configitems('alias'):
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69 if not target:
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70 ui.warn('*** [alias] %s: no definition\n' % cmd)
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71 continue
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72 args = target.split(' ')
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73 tcmd = args.pop(0)
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74 if args:
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75 ui.setconfig('defaults', cmd, ' '.join(args))
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76 cmdtable[cmd] = lazycommand(ui, cmd, tcmd)