On Mon, Jan 28, 2013 at 01:50:19PM -0800, Junio C Hamano wrote:
> What are the situations where a valid user-defined tools is
> unavailable, by the way?

The same as a built-in tool: the command isn't available.

Currently I'm extracting the command word using:

    cmd=$(eval -- "set -- $(git config mergetool.$tool.cmd); echo \"$1\"")

(it's slightly more complicated due to handling difftool.$tool.cmd as
well, but that's essentially it).  Then it just uses the same "type
$cmd" test as for built-in tools.

I don't know if there's a better way to extract the first word, but
that's the best I've come up with so far.

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