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bug#29157: 25.3; Eshell parsing fails sometimes, e.g. "date" and "sed"


From: Pierre Neidhardt
Subject: bug#29157: 25.3; Eshell parsing fails sometimes, e.g. "date" and "sed"
Date: Sat, 25 Nov 2017 18:54:51 +0100
User-agent: mu4e 0.9.18; emacs 25.3.1

Eli Zaretskii <address@hidden> writes:

> Observe:
>
>       ~/git/emacs/branch $ date 42
>       Wed Dec 31 19:00:42 1969
> But
>       ~/git/emacs/branch $ *date 42
>       /bin/date: invalid date ‘42’
>
> So I'm not sure such a naïve solution is TRT in this case, because we
> are losing valuable features by doing that, and those features are not
> just an accident, they were intentionally included in Eshell.

I think you are right.  I did not know that eshell/date could be used
this way.

The issue here is mostly my lack of awareness about what is an Elisp
command and what is a system program.

Maybe having different syntax highlighting for the "verb" depending on
whether it's a system program or an Elisp command would help avoiding
the pitfall.

Is there a trivial way to do this?  If not I'll work on it.  Maybe
create a package if that does not fit the philosophy of mainline Emacs.

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