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xzless: Use ||- in LESSOPEN with with "less" 451 and newer.

This commit is contained in:
Lasse Collin 2024-02-09 23:21:01 +02:00
parent fd0692b052
commit 9860d418d2
1 changed files with 8 additions and 1 deletions
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9
src/scripts/xzless.in
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@ -48,7 +48,14 @@ if test "${LESSMETACHARS+set}" != set; then
fi
VER=$(less -V | { read _ ver _ && echo ${ver%%.*}; })
if test "$VER" -ge 429; then
if test "$VER" -ge 451; then
# less 451 or later: If the compressed file is valid but has
# zero bytes of uncompressed data, using two vertical bars ||- makes
# "less" check the exit status of xz and if it is zero then display
# an empty file. With a single vertical bar |- and no output from xz,
# "less" would attempt to display the raw input file instead.
LESSOPEN="||-$xz -cdfqQ -- %s"
elif test "$VER" -ge 429; then
# less 429 or later: LESSOPEN pipe will be used on
# standard input if $LESSOPEN begins with |-.
LESSOPEN="|-$xz -cdfqQ -- %s"