Re: Quick math calc on any buffer

["B. T. Raven" <nihil@nihilo.net>]

Rodrigo Lazo 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. 
> 
> Regards
> 

Bind the calculator-save-and-quit function to a key-chord. I use 
C-<enter>. Then the same combo will copy result to kill-ring and exit 
(that is, kill calc buffer). C-y will paste result into buffer from 
which the calculator was invoked. If you don't like this solution, you 
can open a line in a buffer in any mode and then evaluate the lisp 
expression on that line

(+ 2 3) C-x C-e

shows 5 in the mini-buffer.

Ed