release/src-rt-6.x.4708/tools/misc/xz/src/scripts/xzless

   1 #!/bin/sh
   2
   3 # Copyright (C) 1998, 2002, 2006, 2007 Free Software Foundation
   4
   5 # The original version for gzip was written by Paul Eggert.
   6 # Modified for XZ Utils by Andrew Dudman and Lasse Collin.
   7
   8 # This program is free software; you can redistribute it and/or modify
   9 # it under the terms of the GNU General Public License as published by
  10 # the Free Software Foundation; either version 2 of the License, or
  11 # (at your option) any later version.
  12
  13 # This program is distributed in the hope that it will be useful,
  14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 # GNU General Public License for more details.
  17
  18 #SET_PATH - This line is a placeholder to ease patching this script.
  19
  20 # Instead of unsetting XZ_OPT, just make sure that xz will use file format
  21 # autodetection. This way memory usage limit and thread limit can be
  22 # specified via XZ_OPT.
  23 xz='xz --format=auto'
  24
  25 version='xzless (XZ Utils) 5.0.3'
  26
  27 usage="Usage: ${0##*/} [OPTION]... [FILE]...
  28 Like 'less', but operate on the uncompressed contents of xz compressed FILEs.
  29
  30 Options are the same as for 'less'.
  31
  32 Report bugs to <lasse.collin@tukaani.org>."
  33
  34 case $1 in
  35         --help)    echo "$usage" || exit 2; exit;;
  36         --version) echo "$version" || exit 2; exit;;
  37 esac
  38
  39 if test "${LESSMETACHARS+set}" != set; then
  40         # Work around a bug in less 394 and earlier;
  41         # it mishandles the metacharacters '$%=~'.
  42         space=' '
  43         tab='   '
  44         nl='
  45 '
  46         LESSMETACHARS="$space$tab$nl'"';*?"()<>[|&^`#\$%=~'
  47 fi
  48
  49 if test "$(less -V | { read ver && echo ${ver#less }; })" -ge 429; then
  50         # less 429 or later: LESSOPEN pipe will be used on
  51         # standard input if $LESSOPEN begins with |-.
  52         LESSOPEN="|-$xz -cdfq -- %s"
  53 else
  54         LESSOPEN="|$xz -cdfq -- %s"
  55 fi
  56 export LESSMETACHARS LESSOPEN
  57
  58 exec less "$@"