File: l.sh
   1 #!/bin/sh
   2 
   3 # The MIT License (MIT)
   4 #
   5 # Copyright (c) 2026 pacman64
   6 #
   7 # Permission is hereby granted, free of charge, to any person obtaining a copy
   8 # of this software and associated documentation files (the "Software"), to deal
   9 # in the Software without restriction, including without limitation the rights
  10 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11 # copies of the Software, and to permit persons to whom the Software is
  12 # furnished to do so, subject to the following conditions:
  13 #
  14 # The above copyright notice and this permission notice shall be included in
  15 # all copies or substantial portions of the Software.
  16 #
  17 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  20 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23 # SOFTWARE.
  24 
  25 
  26 # l [extra options...] [less options...] [files...]
  27 #
  28 # Less, run as `less -MKNiCRS`: this gives you an interactive text viewer
  29 # with both horizontal and vertical scrolling, line numbers, ANSI-code
  30 # support for styled/colored text, and case-insensitive regex search.
  31 #
  32 # Besides the options `less` supports, there are a few extra ones added
  33 # for convenience, and available both in single and double-dash versions
  34 #
  35 #   -help                show this help message
  36 #   -sticky, -t, -top    same as option `--header=1`
  37 
  38 
  39 # busybox's `less` doesn't support the options `-C` and `-K`
  40 if [ -L /usr/bin/less ]; then
  41     options='-RIMS'
  42 else
  43     options='-MKiCRS'
  44 fi
  45 
  46 case "$1" in
  47     -help|--help)
  48         {
  49             awk '/^# +l /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  50             less --help
  51         } | less ${options}
  52         exit 0
  53     ;;
  54 
  55     -sticky|--sticky|-t|--t|-top|--top)
  56         options="${options} --header=1"
  57         shift
  58     ;;
  59 
  60     -) ;;
  61 
  62     --) shift ;;
  63 
  64     -*)
  65         printf "unsupported option '%s'\n" "$1" >&2
  66         exit 1
  67     ;;
  68 esac
  69 
  70 less -N ${options} -- "$@"