Re: exit codes, TRAP, etc.

Toen wij Dallman Ross kietelden, kwam er dit uit:
> Ruud H.G. van Tol:
> > If you also want to POP easily from G_WASHERE,
> POP?  I don't follow you now.
The  G_WASHERE = "${G_WASHERE}${G_LEVEL}:${RCSIG}$NL"
is a PUSH, so G_WASHERE is a stack.

Cutting something from the right of a string with procmail 
(the POP) is just doable when you can cut at a unique 
substring, in this case <newline><level><colon>.

  :0D  # TEST (is top of stack)
  * G_WASHERE ?? ^[A-Za-z]:\/${TESTSIG}$^^
  { JUSTWASTHERE = $MATCH }

  :0D  # TEST (is in stack)
  * G_WASHERE ?? ^[A-Za-z]:\/${TESTSIG}$
  { EVERWASTHERE = $MATCH }

  :0D  # POP (remove top of stack, maybe more)
  *$ G_WASHERE ?? ^^\/(.+$)*${G_LEVEL}:
  * MATCH ?? ^^\/.+(^.+)*
  { G_WASHERE = $MATCH }  


Some things are easier when you PUSH up front, like 

  G_WASHERE = "${G_LEVEL}:${RCSIG}$NL${G_WASHERE}"

because then a POP goes like

  :0  # POP (remove top of stack)
  *$ G_WASHERE ?? ^${G_LEVEL}:.*$\/([A-Za-z]:.*$)*^^
  { G_WASHERE = $MATCH }

That is even without the risk that you cut too much, when several 
strings of the same level were erroneously there. You still can do
  *$ G_WASHERE ?? ^\/([^$G_LEVEL]:.*$)*^^ 
to only keep everything from before the current G_LEVEL.

(all directly from my brain to my fingers to this 
list, so utterly untested)

-- 
Grtz, Ruud

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