Simple question, I think: How can I calculate the length of a line in emacs lisp? It seems like there should be a function for this, but I can't find it. What I'm using right now is something like this:
(- (progn (end-of-line) (current-column)) (progn (beginning-of-line) (current-column)))
But this feels clumsy.
So is there a standard way to do this? And are there any subtleties I should be aware of (i.e. regarding encoding, tabs, or anything like that)?
Actually for my purposes, it would be just as handy to simply calculate if a line is empty. Is there a function for that?
Whatever method I use, it needs to be pretty fast. I need to calculate this for every line in a buffer on a pretty regular basis without interrupting flow.