Re: calc-embedded-activate

[Roger Mason <rmason@esd.mun.ca>]

Hello,

Jay Belanger <belanger@truman.edu> writes:

> Roger Mason <rmason@esd.mun.ca> writes:
>
> ...
>> %Embed 
>> % $f := 2$
>> % $g := 2$
>> % $foo := 5$
>> % $f + g => $
> ...
>> The key combination `C-u 1 M-# a' leads to the following
>> backtrace:
>>
>> Debugger entered--Lisp error: (wrong-type-argument integer-or-marker-p nil)
>
> It looks like a bug with calc-embed, which perhaps can be fixed by
> commenting out the lines
>     (if (looking-at calc-embedded-open-formula)
>         (goto-char (match-end 1)))
> from the definition of calc-do-embed-activate in calc-embed.el.
> (It works for me.)
>

( lines snipped )

Thanks for your response.

I discovered later that terminating the %Embed % $...$  group with
another %Embed cures the problem.  I'm not sure if this is consistent
with your analysis or not.  The terminating %Embed is not part of the
regex in calc-do-embedded-activate, indeed that regex pertains only to
the announcement of a group of formulae, so the `correct' behaviour could
be fortuitous.  Commenting out the ofending lines is cleaner, I'll try
it here and report back.

Having got `M-# a' to work, albeit by trial and error, I have been
trying to update all the fomulae in the buffer using `C-u 1 M-# u'.
This command fails silently: nothing happens and there is no error
signalled.  `M-u' works as described in the manual, so I assume the
bug (if it is a bug and not my stupidity) is in the code that steps
through the buffer finding active formulae.  I presume the best way to
proceed is to improve my aquaintance with the lisp debugger, but if
anyone has any suggestions I'd be grateful to receive them.

Thanks,

Roger Mason