bug#53517: 29.0.50; [PATCH] `eshell-eval-using-options' :preserve-args breaks :external handling in some cases

[Jim Porter]

On 1/24/2022 5:11 PM, Jim Porter wrote:
> (It might be nice to fix that too, but I think it's still useful to
> keep the original raw args around unchanged. Improving "-" support
> could be done later.)

Actually, I'll do that now. Doing so fixes an issue I found in the 
implementation of `eshell/cat'. "cat -" should read from stdin (and the 
Eshell implementation should use the external /bin/cat to do this), but 
it was getting parsed as "cat", so it erroneously thought there were 
*no* input files. Previously, `eshell--process-args' saw the "-" and 
started to look for short options, found none, and then just shrugged 
and ignored that token entirely.

I also fixed an issue with the first patch where I had some misplaced 
parens in test/lisp/eshell/esh-opt-tests.el.

0001-Don-t-manipulate-args-in-place-for-eshell-eval-using.patch
Description: Text document

0002-Treat-as-a-positional-arg-in-eshell-eval-using-optio.patch
Description: Text document