[patch] Make export take an optional branch url

[Aaron Bentley]

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+1.

Daniel Silverstone wrote:

> # Bazaar revision bundle v0.8
> #
> # message:
> #   Add source branch support to export command
> # committer: Daniel Silverstone <daniel.silverstone at canonical.com>
> # date: Sat 2006-10-28 13:40:21.570173979 +0100
> 
> === modified file bzrlib/builtins.py
> --- bzrlib/builtins.py
> +++ bzrlib/builtins.py
> @@ -1648,6 +1648,8 @@
>      Root may be the top directory for tar, tgz and tbz2 formats. If none
>      is given, the top directory will be the root name of the file.
>  
> +    If branch is omitted then the branch containing the CWD will be used.
                           ^---needs a comma here.

> +    def run(self, dest, branch=None, revision=None, format=None, root=None):
>          from bzrlib.export import export
> -        tree = WorkingTree.open_containing(u'.')[0]
> -        b = tree.branch
> +
> +        if branch is None:
> +            tree = WorkingTree.open_containing(u'.')[0]
> +            b = tree.branch
> +        else:
> +            b = Branch.open(branch)

This seems like it would be simpler if you made branch default to '.'
instead of None.

Aaron
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