[Scilab-users] Exclamation mark in variable names

[Samuel Gougeon]

Le 25/05/2018 à 11:02, Samuel Gougeon a écrit :
> Hello,
>
> Le 25/05/2018 à 10:45, Clément David a écrit :
>> Hi,
>>
>> Thanks for your experimental work on that topic. I guess we could 
>> merge the parser fix easily
>> however the `!` usage to recall a previous command will remain 
>> problematic. This usage does not seem
>> to be documented somewhere in the help page, maybe we could discard 
>> it. What's your opinion on that
>> ?
>
> It is an historical and standard feature, used not only in Scilab 
> language.
> Please see the entry http://bugzilla.scilab.org/10776
>
> The only issue is that it is still undocumented. It could be described 
> in the Console's page.

"The only issue" : hmm, not really. Even if the missing documentation is 
the main one, IMO this (already) very handy feature could be improved in 
at least two ways:

  * when no match is found in the history, nothing happens. For people
    who does not know the feature (or who has forgotten that it is
    available), this could be easily puzzling and felt as a bug.
    => when no match is found, Scilab shall print a message "No match
    found in history"

  * A listbox listing matches could be displayed, to select the only
    entry searched for.
    This might be done in two ways :

      o either typing "!" + one char as the very first characters would
        enter a completion mode based on the history, with matches
        listed in a listbox as described hereabove

      o or this could be done only after validating with <enter>, or
        CTRL+space as for the feature completion (but here targeted to
        the history with the leading "!")

If a completion mode is implemented, then the message "no match found in 
history" could be displayed in the listbox instead of in the console 
(note that the general feature completion triggered with CTRL+space 
displays nothing when no match is found).

By the way, as for this "!" history recall, the existing interactive 
usage of the completion is not documented in the Console page. Let's add 
both in the page, as they presently are.

Regards
Samuel

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