scripts/sortman: Use version sort

This is to collate correctly pages like the following:

man7/iso-8859-1.7
man7/iso-8859-2.7
man7/iso-8859-3.7
man7/iso-8859-4.7
man7/iso-8859-5.7
man7/iso-8859-6.7
man7/iso-8859-7.7
man7/iso-8859-8.7
man7/iso-8859-9.7
man7/iso-8859-10.7
man7/iso-8859-11.7
man7/iso-8859-13.7
man7/iso-8859-14.7
man7/iso-8859-15.7
man7/iso-8859-16.7

Also ignore case, since otherwise a version sort would collate 'Z'
before 'a'.  We don't need LC_COLLATE anymore.

Version sort has some issues for our purpose: underscores and dashes
have special (and different) meaning.  We want to ignore underscores or
dashes that aren't next to digits, so that _exit(2) remains next to
exit(2).  However, we want to keep them next to digits, such as in
iso-8859-1(7), to keep the right order for pages with numbers.  For
that, we need some extra sed(1) magic.

Reported-by: Brian Inglis <Brian.Inglis@Shaw.ca>
Cc: Deri James <deri@chuzzlewit.myzen.co.uk>
Signed-off-by: Alejandro Colomar <alx@kernel.org>

1 files changed, 9 insertions, 7 deletions

diff --git a/scripts/sortman b/scripts/sortman
index f0926f215..566326f42 100755
--- a/scripts/sortman
+++ b/scripts/sortman
@@ -3,10 +3,12 @@
 # Copyright 2023, Alejandro Colomar <alx@kernel.org>
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-export LC_COLLATE=en_US.UTF-8;
-
-sed   -E '/\/intro./ s/.*\.([[:digit:]])/\10\t&/' \
-| sed -E '/\/intro./!s/.*\.([[:digit:]])\>/\11\t&/' \
-| sed -E '/\/intro./!s/.*\.([[:digit:]][[:alnum:]]+)/\1\t&/' \
-| sort \
-| cut -f2;
+sed   -E '/\/intro./  s/.*\.([[:digit:]])/\10\t&/' \
+| sed -E '/\/intro./! s/.*\.([[:digit:]])\>/\11\t&/' \
+| sed -E '/\/intro./! s/.*\.([[:digit:]])([[:alnum:]]+)/\12.\2\t&/' \
+| sed -E '            s/\t(.*)/&\n\1/' \
+| sed -E '/\t/        s/([^[:digit:]])[_-]([^[:digit:]])/\1\2/g' \
+| sed -E '/\t/        s/[_-]/_/g' \
+| sed -E '/\t/        {N;s/\n/\t/;}' \
+| sort -fV \
+| cut -f3;