Eguile report templates -- another hurdle - SOLVED!

[Chris Dennis]

Andrew Sackville-West wrote:
> On Sun, Feb 01, 2009 at 12:23:14PM +0000, Chris Dennis wrote:
>> Chris Dennis wrote:
>>> Hello folks
>>>
>>> My project bring HTML templates to GnuCash reports is making good progress.
>>>
>>> But I've stumbled on another problem which requires expert knowledge of 
>>> GnuCash and/org Swig and/or Guile.
>>>
>>> My evaluated report code can access some Gnucash procedures such as 
>>> gnc:make-html-text, but others such as gncInvoiceGetBook remain 'unbound'.
>> In fact the error message refers to 'gncinvoicegetbook' as being 
>> unbound, i.e. with the name in lower case.  Is that relevant?  Guile is 
>> supposed to be case-sensitive unless you tell it not to be.
>>
>> I can reproduce the problem with this bit of code:
>>
>> 8<--------------
>> ;#!/usr/bin/guile
>> (define s1 "(abcDEF \"23\")")
>> (define (abcDEF x)
>>    (display (string-append "This is abcDEF called with " x "\n")))
>> (with-input-from-string s1 (lambda () (local-eval (read)
>>                                                    (the-environment))))
>> (read-enable 'case-insensitive)
>> (with-input-from-string s1 (lambda () (local-eval (read)
>>                                                    (the-environment))))
>> 8<--------------
>>
>> After setting read to be case insensitive, local-eval tries to call 
>> (abcdef) and can't find it.
>>
>> I can't find anywhere in the GnuCash code that turns on case-insensitivity.
>>
>> Does anyone have any idea why this would happen?
> 
> not a clue, but have you tried 
> 
> (read-disable 'case-insensitive)
> 
> in your code somewhere to confirm that this is the problem?
> 
> A

Thanks for the suggestion.  I tried putting (read-disable
'case-insensitive) in all sorts of places in the code and none of them
made any difference.  Adding (read-options) in various places confirmed
that 'case-insensitive had NOT been set.

So I tried all sorts of things to reproduce the error, and eventually
(with much wailing and gnashing of teeth), realised that the culprit was

   (use-modules (ice-9 slib))

which I must have copied from another report, and wasn't actually needed
anyway.

http://www.gnu.org/software/guile/manual/html_node/SLIB.html says "In
general (and as might be expected) when SLIB is loaded it's the SLIB
specifications that are followed."  Which apparently includes
case-insensitivity!

So let that stand as a lesson to young programmers: Guile is
case-sensitive and Scheme isn't.  Using slib puts Guile into Scheme-like
mode for all future (read)s.

And now I can finally make more progress with my wonderful report
templating system.  Tomorrow.

cheers

Chris
-- 
Chris Dennis                                  cgdennis at btinternet.com
Fordingbridge, Hampshire, UK