Re: one key-press to comment out lines of code?

[Emanuel Berg]

Drew Adams <drew.adams@oracle.com> writes:

> Others will no doubt tell you to use `M-;'
> (`comment-dwim') after selecting the text.

Easy to remember! - as the Lisp comment char (the
initiator for one-line comments).

> I prefer to use `comment-region', which I bind to
> `C-x ;'.

Why not use M-; for that as well? C-SPC, move point,
M-; last.

> To uncomment, provide a plain prefix arg (`C-u'):
> `C-u C-x ;'.  To comment using N comment chars, use a
> numeric prefix arg: `C-3 C-x ;'.  (And you can use
> that to nest commented text.)

Yeah, but again, I think it is much simpler to C-SPC,
move point, and M-; (if the region is commented) to
uncomment.

So for all three cases: M-;.

Note that in all programming modes it is still M-; - so
it is not M-// in C++, M-% in LaTeX, etc., or anything
like that.

Even if there is no commenting style defined, hit M-;
and Emacs will ask you what char to use. (Though if
that happens a lot, you should probably configure it
for a file extension, a hash bang or something like
that.)

-- 
underground experts united:
http://user.it.uu.se/~embe8573