File: pad.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 # pad [options...] [files...]
  27 #
  28 # PAD lines by adding trailing spaces to match the widest line.
  29 #
  30 # The options are, available both in single and double-dash versions
  31 #
  32 #   -h, -help    show this help message
  33 
  34 
  35 case "$1" in
  36     -h|--h|-help|--help)
  37         awk '/^# +pad /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  38         exit 0
  39     ;;
  40 
  41     -) ;;
  42 
  43     --) shift ;;
  44 
  45     -*)
  46         printf "unsupported option '%s'\n" "$1" >&2
  47         exit 1
  48     ;;
  49 esac
  50 
  51 # show all non-existing files given
  52 failed=0
  53 for arg in "$@"; do
  54     [ "${arg}" = "-" ] && continue
  55     [ -e "${arg}" ] && continue
  56     printf "no file named \"%s\"\n" "${arg}" >&2
  57     failed=1
  58 done
  59 
  60 [ "${failed}" -gt 0 ] && exit 2
  61 
  62 awk '
  63     {
  64         plain = $0
  65         gsub(/\x1b\[[0-9;]*[A-Za-z]/, "", plain)
  66         l = length(plain)
  67         if (width < l) width = l
  68 
  69         lines[NR] = $0
  70     }
  71 
  72     END {
  73         for (i = 1; i <= NR; i++) {
  74             plain = lines[i]
  75             gsub(/\x1b\[[0-9;]*[A-Za-z]/, "", plain)
  76             l = length(plain)
  77 
  78             printf "%s", lines[i]
  79             for (j = l + 1; j <= width; j++) printf " "
  80             print ""
  81         }
  82     }
  83 ' "$@"