Re: Quick math calc on any buffer

[Chetan]

Scott Frazer <frazer.scott@gmail.com> writes:

> On Feb 21, 11:42 am, Rodrigo Lazo <rlazo....@gmail.com> wrote:
>> Hi all,
>>
>> Is there a way to compute a math expression on any buffer? I mean, if I
>> have a buffer with the following expression
>>
>> 2 + 3
>>
>> I want to mark the region and compute the result
>>
>> 2 + 3 = 5
>>
>> It doesn't seems too hard to do, I've looked on calculator.el for a
>> "computing" function I can call but I didn't find it.
>>
>
> (defun my-calc-result (beg end)
>   (interactive "r")
>   (insert " = " (calc-eval (buffer-substring beg end))))
This makes me wonder, is there a rewriter of math expressions,
something like a macro that can rewrite the arithmetic expression as
regular lisp function calls?