[joe] Save macros and buffer error code

[David P. <da...@ac...>]

I figured out how to make the save macros work to strip trailing whitespace
from lines on save:

-msnew filt,"sed 's/[ \t]*$//'",rtn,retype
-msold filt,"sed 's/[ \t]*$//'",rtn,retype

The behavior is interesting, though.  When saving a new file for the first
time, msnew is run.  After that, I would expect that msold would run for
future saves.  But the file must be re-opened for this to occur.  The code
for this is in ufile.c:289:

   if (bw->b->er == -1 && bw->o.msnew) {
      exemac(bw->o.msnew);
      bw->b->er = -3;
   }
   if (bw->b->er == 0 && bw->o.msold) {
      exemac(bw->o.msold);
   }

I don't understand the logic of that.  buffer.er is documented to be the
"Error code when file is loaded".  The codes are defined as this:

  0 for success
 -1 for new file (file doesn't exist)
 -2 for read error
 -3 for seek error
 -4 for open error

Why is the error code set to "seek error" when a new file is first saved?
Shouldn't it be set to "success"?

-- 
David Phillips <da...@ac...>
http://david.acz.org/