File: jawk.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 # jawk [good...] [bad...] [meh...] [filenames...]
  27 #
  28 # Judge with AWK colors lines using up to 3 (optional) AWK conditions, named
  29 # `good` (green), `bad` (red), and `meh` (gray) respectively. Lines failing
  30 # all the conditions given are shown back verbatim.
  31 #
  32 # The good style is a colorblind-friendly blue if the environment variable
  33 # COLORBLIND is declared and set to 1.
  34 
  35 
  36 case "$1" in
  37     -h|--h|-help|--help)
  38         awk '/^# +jawk /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  39         exit 0
  40     ;;
  41 esac
  42 
  43 [ "$1" = "--" ] && shift
  44 
  45 command="awk"
  46 if [ -p 1 ] || [ -t 1 ]; then
  47     command="stdbuf -oL awk"
  48 fi
  49 
  50 good="${1:-0}"
  51 bad="${2:-0}"
  52 meh="${3:-0}"
  53 
  54 [ $# -gt 0 ] && shift
  55 [ $# -gt 0 ] && shift
  56 [ $# -gt 0 ] && shift
  57 
  58 ${command} '
  59     BEGIN {
  60         # normal good-style is green, colorblind-friendly good-style is blue
  61         good_style = ENVIRON["COLORBLIND"] != 0 ?
  62             "\x1b[38;2;0;95;215m" :
  63             "\x1b[38;2;0;135;95m"
  64         good_fmt = good_style "%s\x1b[0m\n"
  65         good_reset = "\x1b[0m" good_style
  66     }
  67 
  68     { low = lower = tolower($0) }
  69 
  70     '"${good}"' {
  71         gsub(/\x1b\[0m/, good_reset)
  72         printf good_fmt, $0
  73         next
  74     }
  75 
  76     '"${bad}"' {
  77         gsub(/\x1b\[0m/, "\x1b[0m\x1b[38;2;204;0;0m")
  78         printf "\x1b[38;2;204;0;0m%s\x1b[0m\n", $0
  79         next
  80     }
  81 
  82     '"${meh}"' {
  83         gsub(/\x1b\[0m/, "\x1b[0m\x1b[38;2;168;168;168m")
  84         printf "\x1b[38;2;168;168;168m%s\x1b[0m\n", $0
  85         next
  86     }
  87 
  88     1
  89 ' "$@"