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xzless: Support compressed standard input

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It can be somewhat confusing that

	less < some_file.txt

works fine, whereas

	xzless < some_file.txt.xz

does not.  Since version 429, ‘less’ allows a filter specified in
the LESSOPEN environment variable to preprocess its input even if
it comes from standard input, if $LESSOPEN begins with ‘|-’.  So
set $LESSOPEN to take advantage of this feature.

Check less’s version at runtime so xzless can continue to work
with older versions.
This commit is contained in:
Jonathan Nieder 2009-08-09 13:22:12 -05:00 committed by Lasse Collin
parent a7f5d2fe48
commit 1d314b81aa
1 changed files with 7 additions and 1 deletions
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8
src/scripts/xzless.in
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@ -46,7 +46,13 @@ if test "${LESSMETACHARS+set}" != set; then
LESSMETACHARS="$space$tab$nl'"';*?"()<>[|&^`#\$%=~'
fi
LESSOPEN="|$xz -cdfq -- %s"
if test "$(less -V | { read ver && echo ${ver#less }; })" -ge 429; then
# less 429 or later: LESSOPEN pipe will be used on
# standard input if $LESSOPEN begins with |-.
LESSOPEN="|-$xz -cdfq -- %s"
else
LESSOPEN="|$xz -cdfq -- %s"
fi
export LESSMETACHARS LESSOPEN
exec less "$@"