File: showrun.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 # showrun [options...] [command...] [args...]
  27 #
  28 # SHOW a command as a highlighted line of text, then RUN it.
  29 #
  30 # The options are, available both in single and double-dash versions
  31 #
  32 #   -h, -help                 show this help message
  33 #   -e, -error, -m, -merge    merge stderr into main output
  34 #   -n -N                     show line numbers for whole command/output result
  35 
  36 
  37 merge_stderr=0
  38 less_options='-MKiCRS --header=1'
  39 
  40 while [ $# -gt 0 ]; do
  41     case "$1" in
  42         -e|--e|-error|--error|-errors|--errors|-m|--m|-merge|--merge)
  43             merge_stderr=1; shift; continue
  44         ;;
  45 
  46         -h|--h|-help|--help)
  47             awk '/^# +showrun /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  48             exit 0
  49         ;;
  50 
  51         -n|--n|-N|--N) less_options="${less_options} -N"; 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 if [ $# -eq 0 ]; then
  67     awk '/^# +showrun /, /^$/ { gsub(/^# ?/, ""); print }' "$0" >&2
  68     exit 0
  69 fi
  70 
  71 if [ "${merge_stderr}" -eq 0 ]; then
  72     printf "\033[7m%s\033[0m\n" "$*"
  73     "$@"
  74 else
  75     printf "\033[7m%s\033[0m\n" "$*" 2>&1
  76     "$@" 2>&1
  77 fi | { less ${less_options} 2> /dev/null || less -RIMS 2> /dev/null || cat; }