filemerge: support specifying a python function to custom merge-tools...
filemerge: support specifying a python function to custom merge-tools
Eliminates the need to specify a python executable, which may not exist on
system. Additionally launching script inprocess aids portability on systems
that can't execute python via the shell.
Example usage "merge-tools.myTool.executable=python:c:\myTool.py:mergefn"
where myTool.py contains a function:
"def mergefn(ui, repo, args, **kwargs):"
where args is list of args passed to merge tool.
(by default, expanded: $local $base $other)
Invoking the specified python function was done by exposing and invoking
(hook._pythonhook -> hook.pythonhook)
