File: detrail.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 # detrail [options...] [files...]
  27 #
  28 # Ignore trailing spaces, as well as trailing carriage returns. The help
  29 # option is `-h`, `--h`, `-help`, or `--help`.
  30 
  31 
  32 buffered=0
  33 
  34 case "$1" in
  35     -b|--b|-buffered|--buffered)
  36         buffered=1
  37         shift
  38     ;;
  39 
  40     -h|--h|-help|--help)
  41         awk '/^# +detrail /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  42         exit 0
  43     ;;
  44 esac
  45 
  46 [ "$1" = '--' ] && shift
  47 
  48 # show all non-existing files given
  49 failed=0
  50 for arg in "$@"; do
  51     if [ "${arg}" = "-" ]; then
  52         continue
  53     fi
  54     if [ ! -e "${arg}" ]; then
  55         printf "no file named \"%s\"\n" "${arg}" >&2
  56         failed=1
  57     fi
  58 done
  59 
  60 if [ "${failed}" -gt 0 ]; then
  61     exit 2
  62 fi
  63 
  64 flush=0
  65 if [ "${buffered}" -eq 0 ] && { [ -p /dev/stdout ] || [ -t 1 ]; }; then
  66     flush=1
  67 fi
  68 
  69 awk -v flush="${flush}" '
  70     FNR == 1 { gsub(/^\xef\xbb\xbf/, "") }
  71     { gsub(/ *\r?$/, ""); print; if (flush) fflush() }
  72 ' "$@"