[PATCH] alias: implement register_aliases for functionally easy aliasing

[Peter Ruibal]

I committed this changeset to my private mercurial branch in order to make
it easier for my extensions to register aliases, and thought someone
upstream might find it useful.  :)

It splits a "register_aliases(ui, aliases)" function out of the the
"uisetup(ui)" function in alias.py.  This is to make it easier for your own
extensions to register aliases while minimizing code duplication.

aliases is a dict of {"cmd": "tcmd --opts", ...}  much like the [alias]
section contains cmd=tcmd --opts.

For example, you could have the following uisetup in your extension:

def uisetup(ui):
    try:
        import mercurial.extensions
        alias = mercurial.extensions.find('alias')
        alias.register_aliases({
            'qpromote': 'qdelete --rev',
            'new':     'add',
            'unedit':  'revert',
            'changes': 'log',
        })
    except KeyError:
        ui.warn("alias extension is required to add aliases.  Please add
alias= to your [extensions] section in mercurial.ini")

If any changes to the patch are necessary for inclusion in mercurial, I
would be more than willing to make them and resubmit this as necessary if
requested... Otherwise, someone might find this useful as-is to add to their
hg hg patchqueue

Regards,
-- 
Peter Ruibal
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