File: ron.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 # ron [options...] [files...]
  27 #
  28 # Read-Only Nano runs `nano --view`, which disables both editing and saving.
  29 # When no files are given, it shows the standard input contents by default.
  30 #
  31 # If its standard output is being piped, it runs `cat` instead, acting as a
  32 # passthru step along (presumably) a pipe-chain.
  33 #
  34 # The options are, available both in single and double-dash versions
  35 #
  36 #   -h, -help    show this help message
  37 
  38 
  39 case "$1" in
  40     -h|--h|-help|--help)
  41         awk '/^# +ron /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  42         exit 0
  43     ;;
  44 esac
  45 
  46 # show all non-existing files given
  47 dashes=0
  48 failed=0
  49 for arg in "$@"; do
  50     if [ "${arg}" = "-" ]; then
  51         dashes="$((dashes + 1))"
  52         continue
  53     fi
  54     [ -e "${arg}" ] && continue
  55     printf "%s: no file named \"%s\"\n" "$0" "${arg}" >&2
  56     failed=1
  57 done
  58 
  59 if [ "${dashes}" -gt 1 ]; then
  60     printf "%s: can't read from the standard input more than once\n" "$0" >&2
  61     failed=1
  62 fi
  63 
  64 [ "${failed}" -gt 0 ] && exit 2
  65 
  66 if [ -p /dev/stdout ]; then
  67     cat "${@:--}"
  68 else
  69     nano --view "${@:--}"
  70 fi