Recipes vs. Looms vs. pipelines

[Aaron Bentley]

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James Westby wrote:
> There are discussions about whether the "stack" model presented
> by loom is the best, as it entagles threads that don't necessarily
> have a dependency. There are alternative models proposed, including
> a full DAG as implemented by TopGit. My fear is that they are
> too complicated for people to easily grasp, and that they are
> not the best way to solve the problems they aim to.

> Looms on the other hand currently have no parent pointers
> per-thread.

If you want something that implements the stack model and provides
parent pointers, we have that in bzr-pipeline.  It doesn't provide the
same single-glob approach as loom, but that is mainly because bzr
doesn't yet provide colocated branches.  We do want to add that support,
so maybe now is a good time to do it.

> Looms are currently available in the bzr-loom plugin, but it
> is generally agreed that this needs some polish to be really
> usable.

bzr-pipeline is definitely already usable.  I use it daily, and it has
other fans, like rockstar and thumper.  It is also under active development.

> Looms also allow for versioning at the loom level, as well
> as at the revision level. This means that it is possible
> to merge a loom as a whole, including operations that
> add and delete threads. This is crucial to building a
> packaging system on top of them.

These features are enbryonic in loom, and they could be added to
bzr-pipeline.

Aaron
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