Bug in ed
I posted a message a while ago about programs that do nothing at all. People
suggested that I had forgotten to call my main routine and to try with trace.
I had already checked both of these and I later found out when browsing that
the culprit file had size 0 bytes. This added to the commotion, and I
eventually dismissed it as one of those "strange" things and thought it must
have been me fiddling with ed.ex. A couple of months later, I had the same
problem. This time I had an unbutchered ed.ex and I opened my "saved" file in
another window. Empty. I tried several times and ed ensured me the file had
saved OK, but it was clearly empty. When I ran a dos prompt I discovered that
my floppy disk was full. Apparently ed does not account for this.
I have just started investigation dcuny's textgui editor. It runs horribly
slowly on my 386, unlike ed which might as well be compiled it is so quick. I
noticed that ee redraws the entire text screen every time you go down a line.
This leads me to two possible conclusions :
1. David has not had time to optimise it yet
or
2. Euphoria needs built-in text/graphics scrolling routines.
By (2) I mean that rather than redrawing every line, you say scroll(whatever)
and then print out the new line/pixels. If a screen is vector drawn then this
means only the new area has to be redrawn in Euphoria code which should give a
significant speed gain..
What do you all think ?
Daniel
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