Problem Implementing EP

Problem Implementing EP

[Zeeshan Ali]

Hello,
   I am trying to write an XChat guile plugin these days and in it i
need to have the EP part of REPL and here is how i do it:

/* Code begins here */
value = scm_c_eval_string (str);
   
if (value != SCM_UNDEFINED && value != SCM_UNSPECIFIED)
  scm_write (value, port);

/* Code ends here */

   The problem is that i get newlines after each char if the string
evaluates to a list or string. E.g if the string i evaluate is
"hello", i get this printed on my port:

 "
 h
 e
 l
 l
 o
 "
  And on evaluating '(1 2 3), i get this:

 (
 1
  
 2
  
 3
 )

   I just tried replacing the scm_write by scm_display and it fixed
the problem, but for strings only. i-e on "hello" i get hello printed,
but the result remains the same for lists. Any clue?

   One more problem is that i can't seem to find an scm_* equivalent
of gh_eval_str_with_catch. If i am correct to assume that there is
none, perhaps i'll go for what dsmith proposed: get the code of
gh_eval_str_with_catch and write one myself and submit it for
inclusion into the next release?


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Re: Problem Implementing EP

[Zeeshan Ali]

Hello,
   Guys i got the answer to both my questions and here it goes:

>    The problem is that i get newlines after each char if the string
> evaluates to a list or string. E.g if the string i evaluate is
> "hello", i get this printed on my port:
> 
>  "
>  h
>  e
>  l
>  l
>  o
>  "
>   And on evaluating '(1 2 3), i get this:
> 
>  (
>  1
> 
>  2
> 
>  3
>  )
> 
>    I just tried replacing the scm_write by scm_display and it fixed
> the problem, but for strings only. i-e on "hello" i get hello printed,
> but the result remains the same for lists. Any clue?
>

    Well, this turned out to be the problem of xchat print
function(s): they put a newline after each print and when it comes to
a list, you know what happens then :)
 
>    One more problem is that i can't seem to find an scm_* equivalent
> of gh_eval_str_with_catch. If i am correct to assume that there is
> none, perhaps i'll go for what dsmith proposed: get the code of
> gh_eval_str_with_catch and write one myself and submit it for
> inclusion into the next release?
> 

    Well i simply used scm_internal_catch and it works.


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