[patch] limit log to a single branch

[Steve Borho]

On Mon, 2008-02-11 at 11:49 -0200, Alexis S. L. Carvalho wrote:
> Thus spake Steve Borho:
> > TortoiseHg has a 'branch filter' for it's changelog grapher.  It starts
> > at the branch tip and walks backwards only showing changesets explicitly
> > marked as part of the branch their ancestors.
> > 
> > Would people be interested in me back-porting this to the graphlog
> > extension?
> 
> How do you draw non-contiguous branches?  E.g. (showing only branch
> names; time goes from bottom to top):


The algorithm is quite simple:

1) Start with branch tip read from the branch cache
2) Store ancestors of current node
3) Check rev-1.  If it's in ancestor list, plot it.  Else if
ctx.branch() matches, plot it.
4) goto 2

> foo     foo
>   \     /
>    \   /
>     bar
>    /   \
>   /     \
> foo    foo
> 
> Arguably, even if "bar" is in a different branch, you'll want to show
> it (because it's a merge, not because it's a branching point).

If this case, bar is an ancestor of the top foos, so it will be shown.
I'll submit a patch and we can debate whether it's the best approach.

-- 
Steve Borho (steve at borho.org)
http://www.borho.org/~steve/steve.asc
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