File: ut.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 # ut [options...] [filepaths...]
  27 #
  28 #
  29 # Unix Text: a tool to turn ASCII/UTF-8 text into unix-style lines.
  30 #
  31 # This tool concatenates lines ignoring leading UTF-8 BOMs, carriage-returns
  32 # on CRLF pairs at the end of lines, and ensures no lines across inputs are
  33 # accidentally joined, since all lines it outputs end with line-feeds, even
  34 # when the original files don't.
  35 #
  36 # The only option available is to show this help message, using any of
  37 # `-h`, `--h`, `-help`, or `--help`, without the quotes.
  38 
  39 
  40 case "$1" in
  41     -h|--h|-help|--help)
  42         awk '/^# +ut /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  43         exit 0
  44     ;;
  45 esac
  46 
  47 # show all non-existing files given
  48 failed=0
  49 for arg in "$@"; do
  50     if [ "${arg}" = "-" ]; then
  51         continue
  52     fi
  53     if [ ! -e "${arg}" ]; then
  54         printf "\e[31mno file named \"%s\"\e[0m\n" "${arg}" > /dev/stderr
  55         failed=1
  56     fi
  57 done
  58 
  59 # in case of errors, avoid showing an empty screen
  60 if [ "${failed}" -gt 0 ]; then
  61     exit 1
  62 fi
  63 
  64 awk '
  65     # ignore leading UTF-8 BOMs on the first line of each input, when present
  66     FNR == 1 { gsub(/^\xef\xbb\xbf/, "") }
  67 
  68     # ignore trailing carriage-returns before emitting lines; keep flushing
  69     # output-buffer for each line, in case input lines come in `stutters`,
  70     # as when piping live activity logs, for example
  71     { gsub(/\r$/, ""); print; fflush() }
  72 ' "$@"