File: fixlines.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 # fixlines [options...] [files...]
  27 #
  28 # This tool fixes lines in UTF-8 text, ignoring leading UTF-8 BOMs, and
  29 # trailing spaces/carriage-returns on all lines. It also ensures no lines
  30 # across inputs are accidentally joined, since all lines it outputs end
  31 # with line-feeds, even when the original files don't. Finally, empty
  32 # files emit no output.
  33 #
  34 # The options are, available both in single and double-dash versions
  35 #
  36 #    -h, -help    show this help message
  37 #    -0, -null    read/treat null-byte-delimited chunks as input lines
  38 
  39 
  40 nil=0
  41 buffered=0
  42 
  43 while [ $# -gt 0 ]; do
  44     case "$1" in
  45         -b|--b|-buffered|--buffered) buffered=1; shift; continue ;;
  46 
  47         -h|--h|-help|--help)
  48             awk '/^# +fixlines /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  49             exit 0
  50         ;;
  51 
  52         -0|--0|-null|--null) nil=1; shift; continue ;;
  53 
  54         -) break ;;
  55 
  56         --) shift; break ;;
  57 
  58         -*)
  59             printf "%s: unsupported option %s\n" "$0" "$1" >&2
  60             exit 1
  61         ;;
  62     esac
  63 
  64     break
  65 done
  66 
  67 # show all non-existing files given
  68 failed=0
  69 for arg in "$@"; do
  70     [ "${arg}" = '-' ] && continue
  71     [ -e "${arg}" ] && continue
  72     printf "%s: no file named \"%s\"\n" "$0" "${arg}" >&2
  73     failed=1
  74 done
  75 
  76 [ "${failed}" -gt 0 ] && exit 2
  77 
  78 flush=0
  79 if [ "${buffered}" -eq 0 ] && { [ -p /dev/stdout ] || [ -t 1 ]; }; then
  80     flush=1
  81 fi
  82 
  83 awk -v nil="${nil}" -v flush="${flush}" '
  84     BEGIN { if (nil) RS = "\000" }
  85     FNR == 1 { gsub(/^\xef\xbb\xbf/, "") }
  86     { gsub(/ *\r?$/, ""); print; if (flush) fflush() }
  87 ' "$@"