File: fixlines.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 # fixlines [options...] [filepaths...]
  27 #
  28 # This tool fixes lines in UTF-8 text, ignoring leading UTF-8 BOMs and
  29 # trailing carriage-returns on all lines. It also ensures no lines across
  30 # inputs are accidentally joined, since all lines it outputs end with
  31 # line-feeds, even when the original files don't.
  32 #
  33 # The only option available is to show this help message, using any of
  34 # `-h`, `--h`, `-help`, or `--help`, without the quotes.
  35 
  36 
  37 case "$1" in
  38     -h|--h|-help|--help)
  39         awk '/^# +fixlines /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  40         exit 0
  41     ;;
  42 esac
  43 
  44 [ "$1" = "--" ] && shift
  45 
  46 command="awk"
  47 if [ -p 1 ] || [ -t 1 ]; then
  48     command="stdbuf -oL awk"
  49 fi
  50 
  51 # show all non-existing files given
  52 failed=0
  53 for arg in "$@"; do
  54     if [ "${arg}" = "-" ]; then
  55         continue
  56     fi
  57     if [ ! -e "${arg}" ]; then
  58         printf "\e[31mno file named \"%s\"\e[0m\n" "${arg}" > /dev/stderr
  59         failed=1
  60     fi
  61 done
  62 
  63 if [ "${failed}" -gt 0 ]; then
  64     exit 2
  65 fi
  66 
  67 ${command} '
  68     FNR == 1 { gsub(/^\xef\xbb\xbf/, "") }
  69     { gsub(/ *\r?$/, ""); print }
  70 ' "$@"