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From: Janis Papanagnou <janis_papanagnou+ng@hotmail.com>
Newsgroups: comp.unix.shell
Subject: Re: [ksh93u+m] Interactive subshell expansion disfunctional
Date: Sat, 22 Jun 2024 14:47:31 +0200
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On 22.06.2024 14:15, Janis Papanagnou wrote:
> On 22.06.2024 04:10, Janis Papanagnou wrote:
>> On 22.06.2024 01:14, Martijn Dekker wrote:
>>> Op 21-05-2024 om 17:57 schreef Janis Papanagnou:
>>>> I recently replaced all original ksh93u+ by ksh93u+m, and meanwhile
>>>> noticed quite some deficiencies, things that worked in original ksh
>>>> but not any more in ksh93u+m.
>>>
>>> I would of course be very interested in learning what deficiencies
>>> (other than the below) you've been observing.
>>
>> [...] another thing was in context of discipline functions used on
>> shell variables. [...]
> 
> [...]
> 
> and the "kosta" code contains
> 
>   function LINES.set   { .kosta.rows=${.sh.value} ; .kosta.update ;}
>   function COLUMNS.set { .kosta.cols=${.sh.value} ;}
>   function PS1.get     { .kosta.compose ;}
>   namespace kosta
>   {
>     ...
>   }
> 
> and it's activated by sourcing it from ~/.kshrc
> 
> I can't tell whether I have missed something with discipline functs
> on built-in variables, how I used the namespaces, or something like
> that. (My tries to fix that in my program logic all failed.) Though
> the above "no parent" error messages did not show up with ksh93u+.
> And it can now be observed in various _script interaction_ contexts.

There's another effect in this context.

Previously with ksh93u+ the "kosta" code called '.kosta.compose' if
'PS1.get' gets called; the compose function reconstructs the status
line. If an error occurred or a signal arrived that was indicated
in the status line as, say, "ERR 2!" or "SIG INT(2)!". After I hit
the <Enter> key (an empty line) that part of the status message got
cleared. - Not any more with ksh93u+m. It seem that the 'compose'
function won't be called any more on an empty shell input line.

Janis