Making "bzr diff" call an external GUI diff program.

[Aaron Bentley]

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Wouter van Heyst wrote:
| I'd start at bzrlib/diff.py:external_diff, and make the external diff
| program configurable instead of hardcoded:

That's fine, but using GNU diff when extra options are passed should
remain an implementation detail.  You'd probably want to provide an
external_command parameter to bzrlib.diff.show_diff

Aaron
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