[PATCH] Add support for external command handlers

[Aaron Bentley]

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Hi Michael,

Michael Ellerman wrote:
> Hi Martin,
> 
> This patch allows you to create a script, eg. 'do-cool-stuff' which you place
> somewhere in your BZRPATH. Then when you type 'bzr do-cool-stuff' bzr will
> find the script and call it.

This reminds me of my aba tla wrapper and Fai Arch front-end.
(http://push.sourcecontrol.net/~abentley/aba.php)  Both use the same
conventions to allow external scripts/executables and tla commands to be
used interchangeably.

foo exec $*	Perform their operation on the supplied arguments
foo exec (-h|--help)	Provide short help
foo exec (-H)	Provide long help
foo desc	Describe the script's function, in 'tla help' format

All the options except -H would apply to bzr, too.

I should note though, that what I was doing with Fai was treating Tom
Lord as 'damage' wrt usability, and routing around him.  With Martin, I
don't think that's necessary, so Python scripts might be best, as they
allow him to integrate them into the core as appropriate.

Fai also had a plugin system for Python commands-- I'd be happy to
contribute it.

Aaron
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