File: tcatl.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 # tcatl [options...] [files...]
  27 #
  28 # Titled conCATenate Lines ensures no lines across inputs are accidentally
  29 # joined, since all lines it outputs end with line-feeds, even when the
  30 # original files don't. It also highlights the filename, before emitting its
  31 # lines.
  32 #
  33 # The options are, available both in single and double-dash versions
  34 #
  35 #   -h, -help    show this help message
  36 #   -0, -null    turn null-byte-delimited chunks into proper lines
  37 
  38 
  39 nulled=0
  40 buffered=0
  41 
  42 while [ $# -gt 0 ]; do
  43     case "$1" in
  44         -b|--b|-buffered|--buffered) buffered=1; shift; continue ;;
  45 
  46         -h|--h|-help|--help)
  47             awk '/^# +tcatl /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  48             exit 0
  49         ;;
  50 
  51         -0|--0|-null|--null) nulled=1; shift; continue ;;
  52 
  53         -) break ;;
  54 
  55         --) shift; break ;;
  56 
  57         -*)
  58             printf "unsupported option '%s'\n" "$1" >&2
  59             exit 1
  60         ;;
  61     esac
  62 
  63     break
  64 done
  65 
  66 # show all non-existing files given
  67 failed=0
  68 for arg in "$@"; do
  69     [ "${arg}" = "-" ] && continue
  70     [ -e "${arg}" ] && continue
  71     printf "no file named \"%s\"\n" "${arg}" >&2
  72     failed=1
  73 done
  74 
  75 [ "${failed}" -gt 0 ] && exit 2
  76 
  77 flush=0
  78 if [ "${buffered}" -eq 0 ] && { [ -p /dev/stdout ] || [ -t 1 ]; }; then
  79     flush=1
  80 fi
  81 
  82 src='
  83     FNR == 1 { gsub(/^\xef\xbb\xbf/, "") }
  84     { print; if (flush) fflush() }
  85 '
  86 
  87 dashes=0
  88 
  89 for arg in "$@"; do
  90     if [ "${arg}" = "-" ]; then
  91         [ "${dashes}" -ne 0 ] && continue
  92         printf "\033[7m%-80s\033[0m\n" '<stdin>'
  93         dashes=1
  94     else
  95         printf "\033[7m%-80s\033[0m\n" "${arg}"
  96     fi
  97 
  98     if [ "${nulled}" -eq 0 ]; then
  99         awk -v flush="${flush}" "${src}" "$@"
 100     else
 101         awk -v RS='\000' -v flush="${flush}" "${src}" "$@"
 102     fi
 103 done
 104 
 105 if [ $# -eq 0 ]; then
 106     printf "\033[7m%-80s\033[0m\n" '<stdin>'
 107     if [ "${nulled}" -eq 0 ]; then
 108         awk -v flush="${flush}" "${src}"
 109     else
 110         awk -v RS='\000' -v flush="${flush}" "${src}"
 111     fi
 112 fi