File: stomp.sh 1 #!/bin/sh 2 3 # The MIT License (MIT) 4 # 5 # Copyright © 2020-2025 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 [filepaths...] 27 # 28 # 29 # Turn runs of empty lines into single empty lines, effectively squeezing 30 # paragraphs vertically, so to speak; runs of empty lines both at the start 31 # and at the end are ignored. 32 # 33 # This script also ensures no lines across inputs are accidentally joined, 34 # since all lines it outputs end with line-feeds, even when the original 35 # files don't. 36 37 38 case "$1" in 39 -h|--h|-help|--help) 40 # show help message, using the info-comment from this very script 41 awk '/^# +stomp /, /^$/ { gsub(/^# ?/, ""); print }' "$0" 42 exit 0 43 ;; 44 esac 45 46 awk ' 47 /^\r?$/ { 48 empty = 1 49 next 50 } 51 52 empty { 53 if (n > 0) print "" 54 empty = 0 55 } 56 57 { 58 print; fflush() 59 n++ 60 } 61 ' "$@"