File: stomp.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 # stomp [options...] [files...]
  27 #
  28 # Turn runs of empty lines into single empty lines, effectively squeezing
  29 # paragraphs vertically, so to speak; runs of empty lines both at the start
  30 # and at the end are completely ignored.
  31 #
  32 # This script also ensures no lines across inputs are accidentally joined,
  33 # since all lines it outputs end with line-feeds, even when the original
  34 # files don't.
  35 #
  36 # The options are, available both in single and double-dash versions
  37 #
  38 #   -h, -help    show this help message
  39 
  40 
  41 buffered=0
  42 
  43 case "$1" in
  44     -b|--b|-buffered|--buffered) buffered=1; shift ;;
  45 
  46     -h|--h|-help|--help)
  47         awk '/^# +stomp /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  48         exit 0
  49     ;;
  50 
  51     -) ;;
  52 
  53     --) shift ;;
  54 
  55     -*)
  56         printf "%s: unsupported option '%s'\n" "$0" "$1" >&2
  57         exit 1
  58     ;;
  59 esac
  60 
  61 # show all non-existing files given
  62 failed=0
  63 for arg in "$@"; do
  64     [ "${arg}" = "-" ] && continue
  65     [ -e "${arg}" ] && continue
  66     printf "%s: no file named \"%s\"\n" "$0" "${arg}" >&2
  67     failed=1
  68 done
  69 
  70 [ "${failed}" -gt 0 ] && exit 2
  71 
  72 flush=0
  73 if [ "${buffered}" -eq 0 ] && { [ -p /dev/stdout ] || [ -t 1 ]; }; then
  74     flush=1
  75 fi
  76 
  77 awk -v flush="${flush}" '
  78     /^\r?$/ { empty = 1; next }
  79     empty { empty = 0; if (n > 0) print "" }
  80     { n++; print; if (flush) fflush() }
  81 ' "$@"