From: Julian Phillips <julian@quantumfyre.co.uk>
Date: Fri, 20 Mar 2009 23:08:42 GMT
Subject: Re: [PATCH v4] Introduce %<branch> as shortcut to the tracked branch
Message-ID: <alpine.LNX.2.00.0903202300330.13726@reaper.quantumfyre.co.uk>
In-Reply-To: <7v7i2ki0sw.fsf@gitster.siamese.dyndns.org>

On Fri, 20 Mar 2009, Junio C Hamano wrote:

> An most obvious one is that "git checkout branchname" and "git checkout
> refs/heads/branchname" behave differently.  You cannot checkout a branch
> called %master after this patch goes in.
>
> Just be honest and say "You may have a branch whose name begins with a '%'
> and you cannot refer to it anymore in certain contexts.  Too bad.  Don't
> do it next time you create a new branch".  I _can_ buy that argument.
>
> It however asks for a sane escape hatch.  You cannot "fix" such branch
> names in most obvious ways (if you could, that would be a bug in this %
> feature).
>
> (1) git branch -m %master percent-master
>
>     We would end up renaming what master tracks to new name.
>
> (2) git branch percent-master refs/heads/%master; git branch -d %master
>
>     The first part is a good try, but the latter deletes what master
>     tracks.

How about adding a generic escape hatch, that would cover this and 
future extensions?

Let a ref that starts with a single quote be taken as given and not 
processed.  You have to escape it to get it past the shell, but that makes 
it rather unlikely that anyone has used a name that starts with a quote - 
and if they have you can still use this mechanism to rename it.

So now (1) above could be written:

  git branch -m "'%master" percent-master

and other commands, such as

  git branch -d "'%master"

or

  git checkout "'%master"

would also do the right thing (i.e. use refs/heads/%master as a branch).

-- 
Julian

  ---
Stewie Griffin:  [looking in the fridge for a drink] Soda... purple stuff... Sunny D, all right!