Re: Beginner questions

[Neil Jerram <neil@ossau.homelinux.net>]

Catonano <catonano@gmail.com> writes:

> Neil,
>
> Il giorno lun 19 nov 2018 alle ore 10:02 Neil Jerram <
> neil@ossau.homelinux.net> ha scritto:
>
>>
>>
>> On 18 November 2018 19:33:31 GMT, Catonano <catonano@gmail.com> wrote:
>> >Il giorno lun 29 ott 2018 alle ore 22:58 swedebugia
>> ><swedebugia@riseup.net>
>> >ha scritto:
>> >
>> >> Hi
>> >>
>> >> I would like to learn more scheme and I would like to make a small
>> >CLI
>> >> program that runs in the terminal and prompts the user for input and
>> >> evaluates it.
>> >>
>> >> Is that possible with guile? In the REPL?
>> >>
>> >> Can someone point me in the right direction for succeding with that?
>> >>
>> >>
>> >>
>> >
>> > Hi
>> >
>> >I am curious: did you manage to put together a prototype of this thing
>> >prompting a user in the terminal ?
>>
>> In case it's of interest, I wrote this kind of thing a few years ago: a
>> command loop for Guile where you can register possible commands, and each
>> command has a spec like the Emacs 'interactive' form that says what the
>> args are and how to prompt for them.
>>
>> The command loop entry point is at
>> http://git.savannah.nongnu.org/cgit/ossaulib.git/tree/ossau/command-loop.scm
>> and the dependency modules are all included in that git repo.
>>
>> Best wishes,
>>      Neil
>>
>
> thank you
>
> But I'm a bit overwhelmed by so much code

Thanks for taking a look.  It is a _lot_ of code, so I can understand it
being overwhelming.

> a tiny example of reading a short string that a user could type at a prompt
> would be more useful to a beginner, I think
>
> I came up with this short example
>
> (use-modules (ice-9 rdelim))
>
> (let ((str (read-line (current-input-port))))
>     (display (string-append str "\n")))
>
> it's extremely essential but it demonstrates the usage of the current input
> port in association with delimited text reading
>
> This is a very basic use case, intended as an example, a step 0 for further
> developments

I started with that (or something very like it), but then gradually
added more structure for the specific applications that I had in
mind... and surprisingly quickly we can end up with the amount of code
that I have in ossaulib.

Best wishes,
   Neil