bug#6963: More usecases, patch attached

[Thierry Volpiatto]

Wolfgang Schnerring <wosc@wosc.de> writes:

> emacsclient is such a usefull tool. But that it does not signal error
> situations via its exit status severely hinders its usage in shell
> scripts or in integration with other programs.
>
> For example, I was bit by this rather badly when I tried to use
> emacsclient to start an ediff session, to use as a merge tool for the
> Mercurial SCM.
> I may have made a typo in configuring said ediff command or for
> whatever other reason, Emacs returned an error. But Mercurial was
> blissfully unaware of this, since emacsclient returns 0 no matter
> what. End result: Mercurial committed a broken merge that I had to
> spend at least two hours some days later to debug.
>
> I've attached a patch that makes emacsclient exit with nonzero status
> when it receives an error message from Emacs -- it already *prints*
> "*ERROR*" in these cases, so I feel this makes a lot of sense.
>
> Thanks,
> Wolfgang
>

Did you use your own script or the mercurial script to use
emacsclient/ediff?

-- 
A+ Thierry
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