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Re: How to impose a numeric sort on negative numbers?
Daniel Shahaf wrote on Fri, 03 Jul 2020 22:23 +0000:
> > The doc was just to record the fact that I didn't treat a "-" as "-0",
> > just as a character "-". That was a deliberate choice --- I'm
> > assuming the usual case of a numeric sort will have at least one
> > decimal digit in the part to be sorted and anything else is
> > just a hyphen (and definitely not a dash).
> FWIW, I thought at first reading that that second sentence referred to
> the `tt(-)' in the parameter expansion flags, not to the one in the
> input data. I'd never have expected "-" or "-foo" to be considered an
> integer in the first place, just like "" and "foo" aren't considered integers.
> Incidentally, should "+42" be sorted as an integer? Right now it isn't.
The following patch addresses the first issue and documents "+42" as a
possible future extension.
diff --git a/Doc/Zsh/expn.yo b/Doc/Zsh/expn.yo
index 41ad967b2..21ecf9d6e 100644
@@ -1092,15 +1092,18 @@ Convert all letters in the result to lower case.
Sort decimal integers numerically; if the first differing
characters of two test strings are not digits, sorting
-is lexical. Integers with more initial zeroes
-are sorted before those with fewer or none. Hence the array `tt(foo1 foo02
+is lexical. `tt(+)' and `tt(-)' are not treated specially; they are treated as
+any other non-digit. Integers with more initial zeroes
+are sorted before those with fewer or none. Hence the array `tt(foo+24 foo1 foo02
foo2 foo3 foo20 foo23)' is sorted into the order shown.
May be combined with `tt(i)' or `tt(O)'.
As tt(n), but a leading minus sign indicates a negative decimal
-integer. A `tt(-)' not followed by an integer does not trigger
+integer. A leading minus sign not followed by an integer does not trigger
+Note that `tt(+)' signs are not handled specially (this may change in the
Sort the resulting words in ascending order; if this appears on its
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