Ouch! I don't think I ever noticed this before: PREDSELECT "terminates
as soon as its primary input is severed."
pipe (end /) literal OK GO|a:chop 2|b:predselect|cons/a:|b:
OK
Ready;
but:
pipe (end /) literal OK GO|split|a:take 1|b:predselect|cons/a:|b:
Ready;
I was already playing games with COUNT on the alternate to try to catch
an unmatched last record at EOF. I suppose I could feed the same final
trigger record back into the primary to keep it connected:
(end /) ...
| feedback: fanin
| match: predselect
| ... (matched)
/ ...
| count: count lines
| match:
| ... (unmatched)
/ count:
| countdup: chop 0
| match:
/ countdup:
| feedback:
But that seems awfully cryptic and convoluted.
In the case at hand, I have just one record on the primary, and there
may be records before it on the alternate that I don't care about. I
just want to know whether there are any records *after* it on the
alternate--and, actually, I only want output if there *aren't*. I guess
COUNT|JUXTAPOSE would do the job a little more simply:
(end /)
| nomatch: juxtapose
| ... (unmatched)
/ ...
| count lines
| pick w1 == '0'
| chop 0
| nomatch:
Anybody got a more straightforward way?
¬R
