Re: misbehavior in shell window with ksh

[Tino Calancha <tino.calancha@gmail.com>]

On Mon, 1 May 2017, Mike Kupfer wrote:

> Stephen Berman wrote:
>> Could this be related to some of your shell customizations?
>
> Having EDITOR set to emacs (or emacsclient) seems to be required for me
> to reproduce the problem.
>
>  $ export EDITOR=emacs
>  $ emacs -Q -nw
>  => problem reproduces
>
>  $ emacs -Q -nw (w/o EDITOR set)
>  M-x shell RET
>  export EDITOR=emacs RET
>  ksh RET
>  => problem reproduces
>
>  $ export EDITOR=emacs
>  $ emacs -Q -nw
>  M-x shell RET
>  unset EDITOR RET
>  ksh RET
>  => problem does not reproduce
Thanks.  I can reproduce the issue if i set EDITOR as you do.

*) Originally, with EDITOR set to
'/home/calancha/bin/edit'
i don't see the bug.

M-x emacs -Q RET
M-x shell RET
$ ksh RET
$ echo $EDITOR
/home/calancha/bin/edit
$ export EDITOR=$EDITOR ; No issue.

**) If i set EDITOR equal to some unexistant file like
'foo', i don't see the bug (but it depends of the name).

M-x emacs -Q RET
M-x shell RET
$ ksh RET
$ [ "" != "$(which emasc)" ] || [ "" != "$(which foo)" ] || echo "Both unset"
Both unset
$ export EDITOR=foo ; no issue
$ export EDITOR=emasc ; no issue

***) If i set EDITOR to some unexistant file containing some keywords,
then i might the issue:

M-x emacs -Q RET
M-x shell RET
$ ksh RET
$ [ "" != "$(which foo-vi)" ] || [ "" != "$(which foo-emacs)" ] || echo "Both unset"
Both unset

$ export EDITOR=foo-vi ; It shows the bug.
$ export EDITOR=foo-emacs ; Same.

****) Once the bug appears, reseting EDITOR to the original value
doesn't help.  You must kill the buffer and call again:
M-x shell.

M-x emacs -Q RET
M-x shell RET
$ ksh RET
$ EDITOR_ORIG=$EDITOR
$ export EDITOR=foo-emacs ; It shows the bug.
$ export EDITOR=$EDITOR_ORIG ; It doesn't help.

Regards,
Tino