File: ecoli.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 # ecoli [regex/style pairs...]
  27 #
  28 # Expressions COloring LInes tries to match each line to the regexes given,
  29 # coloring/styling with the named-style associated to the first match, if
  30 # any.
  31 #
  32 # Lines not matching any regex stay verbatim.
  33 #
  34 # The colors/styles available are:
  35 #     blue
  36 #     bold
  37 #     gray
  38 #     green
  39 #     inverse
  40 #     magenta
  41 #     orange
  42 #     purple
  43 #     red
  44 #     underline
  45 #
  46 # Some style aliases are:
  47 #     b       blue
  48 #     g       green
  49 #     m       magenta
  50 #     o       orange
  51 #     p       purple
  52 #     r       red
  53 #     u       underline
  54 #     hi      inverse (highlight)
  55 
  56 
  57 # if [ $# -eq 0 ]; then
  58 #     awk '/^# +ecoli/, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  59 #     exit 0
  60 # fi
  61 
  62 
  63 awk '
  64 BEGIN {
  65     # alias-lookup table
  66     a["r"] = "red"
  67     a["g"] = "green"
  68     a["b"] = "blue"
  69     a["o"] = "orange"
  70     a["p"] = "purple"
  71     a["m"] = "magenta"
  72     a["h"] = "invert"
  73     a["i"] = "invert"
  74     a["u"] = "underline"
  75     a["or"] = "orange"
  76     a["ma"] = "magenta"
  77     a["hi"] = "invert"
  78     a["in"] = "invert"
  79     a["un"] = "underline"
  80     a["inv"] = "invert"
  81     a["mag"] = "magenta"
  82     a["grey"] = "gray"
  83     a["inverse"] = "invert"
  84     a["inverted"] = "invert"
  85     a["hilite"] = "invert"
  86     a["hilited"] = "invert"
  87     a["highlight"] = "invert"
  88     a["highlighted"] = "invert"
  89     a["underlined"] = "underline"
  90 
  91     # style-lookup table
  92     s["red"] = "\x1b[38;5;1m"
  93     s["green"] = "\x1b[38;5;29m"
  94     s["blue"] = "\x1b[38;5;26m"
  95     s["orange"] = "\x1b[38;5;166m"
  96     s["purple"] = "\x1b[38;5;99m"
  97     s["magenta"] = "\x1b[38;5;165m"
  98     s["gray"] = "\x1b[38;5;248m"
  99     s["bold"] = "\x1b[1m"
 100     s["invert"] = "\x1b[7m"
 101     s["italic"] = "\x1b[3m"
 102     s["underline"] = "\x1b[4m"
 103 
 104     n = 0
 105     if (ARGC % 2 != 1) {
 106         printf "\x1b[31mmissing final style name\x1b[0m\n" > "/dev/stderr"
 107         exit 1
 108     }
 109 
 110     for (i = 1; i < ARGC; i++) {
 111         arg = ARGV[i]
 112         delete ARGV[i]
 113 
 114         if (i % 2 != 0) {
 115             exprs[n] = arg
 116             continue
 117         }
 118 
 119         name = arg
 120         # resolve aliases
 121         if (a[name] != "") {
 122             name = a[name]
 123         }
 124 
 125         if (s[name] == "") {
 126             fmt = "\x1b[31mstyle/color %s not supported\x1b[0m\n"
 127             printf(fmt, name) > "/dev/stderr"
 128             exit 1
 129         }
 130 
 131         styles[n] = s[name]
 132         n++
 133     }
 134 }
 135 
 136 {
 137     for (i in styles) {
 138         if ($0 ~ exprs[i]) {
 139             printf "%s%s\x1b[0m\n", styles[i], $0
 140             fflush()
 141             next
 142         }
 143     }
 144 
 145     print
 146     fflush()
 147 }
 148 ' "$@"