Re: [PATCH] Teach 'git-apply --whitespace=strip' to remove empty lines at the end of file

From: Marco Costalba <mcostalba@gmail.com>
Date: May 22, 2007, 11:13 UTC
Message-ID: <e5bfff550705220413v261e1543s220d97ce4b9da07b@mail.gmail.com>
In-Reply-To: <7vbqgdbq5j.fsf@assigned-by-dhcp.cox.net>

On 5/22/07, Junio C Hamano <junkio@cox.net> wrote:

Show 18 quoted lines

> "Marco Costalba" <mcostalba@gmail.com> writes:
>
> > On 5/21/07, Junio C Hamano <junkio@cox.net> wrote:
> >> Junio C Hamano <junkio@cox.net> writes:
> >>
> >>
> >> We somehow end up removing one LF too many, like this:
> >>
> >>     diff --git a/contrib/emacs/.gitignore b/contrib/emacs/.gitignore
> >>     index c531d98..016d3b1 100644
> >>     --- a/contrib/emacs/.gitignore
> >>     +++ b/contrib/emacs/.gitignore
> >>     @@ -1 +1 @@
> >>     -*.elc
> >>     +*.elc
> >>     \ No newline at end of file
> >>
> >

The final, and correct version is:

       if (new_whitespace == strip_whitespace && trailing_added_lines)  {

	int n = 0;
	for (   ; n  <= trailing_added_lines; n++)  { /* counting trailing '\n' */

		if (newsize == n)  {
			n++;
			break;
		}
		if (new[newsize - 1 - n] != '\n')
			break;
	}
             trailing_added_lines = (n>0) ? --n : 0;
      }  else
	trailing_added_lines = 0;

but I understand is ugly as hell. The fact is, it is far easier to count '\n' *while* they are created then after at the end.

So no problem for me if you drop my patch.

  Marco