File: cext.sh
   1 #!/bin/sh
   2 
   3 # The MIT License (MIT)
   4 #
   5 # Copyright © 2024 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 # cext [options...] [files...]
  27 #
  28 # Color/style file EXTensions makes all file-extensions stand out, using
  29 # different ANSI-styles as it finds new ones. Since its list of styles is
  30 # limited, these will start being reused, given enough unique extensions.
  31 #
  32 # The help option is `-h`, `--h`, `-help`, or `--help`.
  33 
  34 
  35 # handle leading options
  36 case "$1" in
  37     -h|--h|-help|--help)
  38         awk '/^# +cext/, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  39         exit 0
  40     ;;
  41 esac
  42 
  43 awk '
  44 BEGIN {
  45     palette[n++] = "\x1b[38;5;26m" # blue
  46     palette[n++] = "\x1b[38;5;166m" # orange
  47     palette[n++] = "\x1b[38;5;99m" # purple
  48     palette[n++] = "\x1b[38;5;38m" # cyan
  49     palette[n++] = "\x1b[38;5;213m" # pink
  50     palette[n++] = "\x1b[38;5;29m" # green
  51     palette[n++] = "\x1b[31m" # red
  52     palette[n++] = "\x1b[38;5;248m" # gray
  53     palcount = length(palette)
  54     n = 0
  55 }
  56 
  57 {
  58     # ignore notifications (code 9) and hyperlinks (code 8)
  59     # gsub(/\x1b\](8|9);[^\x07]*\x07/, "")
  60     # ignore cursor-movers and style-changers
  61     # gsub(/\x1b\[([0-9]*[A-HJKST]|[0-9;]*m)/, "")
  62 
  63     rest = $0
  64 
  65     while (match(rest, /\.[A-Za-z][A-Za-z0-9_-]*/)) {
  66         printf "%s", substr(rest, 1, RSTART - 1)
  67 
  68         ext = substr(rest, RSTART, RLENGTH)
  69         rest = substr(rest, RSTART + RLENGTH)
  70 
  71         style = ext2style[ext]
  72         if (style == "") {
  73             style = palette[n % palcount]
  74             ext2style[ext] = style
  75             n++
  76         }
  77 
  78         printf "%s%s\x1b[0m", style, ext
  79     }
  80 
  81     print rest
  82 }' "$@"