File: style.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 # style [style-name] [filenames...]
  27 #
  28 # Add ANSI-style codes to all input lines, using the leading argument
  29 # as the style/color name to use.
  30 #
  31 # Supported style names include
  32 #
  33 # - red     - orange    - bold     - underline
  34 # - green   - magenta   - purple   - invert
  35 # - blue    - gray      - italic
  36 #
  37 # Supported aliases for style names include
  38 #
  39 #   b    (blue)
  40 #   g    (green)
  41 #   h    (hilight/invert)
  42 #   m    (magenta)
  43 #   o    (orange)
  44 #   p    (purple)
  45 #   r    (red)
  46 #   u    (underline)
  47 
  48 
  49 if [ $# -eq 0 ]; then
  50     awk '/^# +style /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  51 
  52     # show error after the help message, so it's noticed
  53     printf "\x1b[31mmissing style/color name\x1b[0m\n" > /dev/stderr
  54     exit 1
  55 fi
  56 
  57 case "$1" in
  58     -h|--h|-help|--help)
  59         awk '/^# +style /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  60         exit 0
  61     ;;
  62 esac
  63 
  64 name="${1}"
  65 [ $# -gt 0 ] && shift
  66 
  67 # handle special style-names
  68 case "${name}" in
  69     plain)
  70         # the general case can't handle simply removing all styles
  71         awk '{
  72             gsub(/\x1b\[[0-9;]*[A-Za-z]/, "")
  73             print; fflush()
  74         }' "$@"
  75         exit $?
  76     ;;
  77 
  78     keep)
  79         # the general case handles empty style-strings as errors
  80         awk '{ printf "%s\x1b[0m\n", $0; fflush() }' "$@"
  81         exit $?
  82     ;;
  83 esac
  84 
  85 # general case to handle actual styles
  86 awk -v name="${name}" '
  87 BEGIN {
  88     orig = name
  89     gsub(/^-{1,2}/, "", name)
  90 
  91     # alias-lookup table
  92     a["r"] = "red"
  93     a["g"] = "green"
  94     a["b"] = "blue"
  95     a["o"] = "orange"
  96     a["p"] = "purple"
  97     a["m"] = "magenta"
  98     a["h"] = "invert"
  99     a["i"] = "invert"
 100     a["u"] = "underline"
 101     a["or"] = "orange"
 102     a["ma"] = "magenta"
 103     a["hi"] = "invert"
 104     a["in"] = "invert"
 105     a["un"] = "underline"
 106     a["inv"] = "invert"
 107     a["mag"] = "magenta"
 108     a["grey"] = "gray"
 109     a["inverse"] = "invert"
 110     a["inverted"] = "invert"
 111     a["hilite"] = "invert"
 112     a["hilited"] = "invert"
 113     a["highlight"] = "invert"
 114     a["highlighted"] = "invert"
 115     a["underlined"] = "underline"
 116     a["bb"] = "blueback"
 117     a["gb"] = "greenback"
 118     a["mb"] = "magentaback"
 119     a["ob"] = "orangeback"
 120     a["pb"] = "purpleback"
 121     a["rb"] = "redback"
 122     a["bg"] = "greenback"
 123     a["bm"] = "magentaback"
 124     a["bo"] = "orangeback"
 125     a["bp"] = "purpleback"
 126     a["br"] = "redback"
 127     a["bluebg"] = "blueback"
 128     a["graybg"] = "grayback"
 129     a["greenbg"] = "greenback"
 130     a["greyback"] = "grayback"
 131     a["greybg"] = "grayback"
 132     a["magentabg"] = "magentaback"
 133     a["orangebg"] = "orangeback"
 134     a["purplebg"] = "purpleback"
 135     a["redbg"] = "redback"
 136     a["magback"] = "magentaback"
 137     a["magbg"] = "magentaback"
 138     a["orback"] = "orangeback"
 139     a["orbg"] = "orangeback"
 140     a["purback"] = "purpleback"
 141     a["purbg"] = "purpleback"
 142 
 143     # style-lookup table
 144     s["red"] = "\x1b[38;2;204;0;0m"
 145     s["green"] = "\x1b[38;2;0;135;95m"
 146     s["blue"] = "\x1b[38;2;0;95;215m"
 147     s["orange"] = "\x1b[38;2;215;95;0m"
 148     s["purple"] = "\x1b[38;2;135;95;255m"
 149     s["magenta"] = "\x1b[38;2;215;0;255m"
 150     s["gray"] = "\x1b[38;2;168;168;168m"
 151     s["bold"] = "\x1b[1m"
 152     s["invert"] = "\x1b[7m"
 153     s["italic"] = "\x1b[3m"
 154     s["underline"] = "\x1b[4m"
 155     s["blueback"] = "\x1b[48;2;0;95;215m\x1b[38;2;238;238;238m"
 156     s["grayback"] = "\x1b[48;2;168;168;168m\x1b[38;2;238;238;238m"
 157     s["greenback"] = "\x1b[48;2;0;135;95m\x1b[38;2;238;238;238m"
 158     s["magentaback"] = "\x1b[48;2;215;0;255m\x1b[38;2;238;238;238m"
 159     s["orangeback"] = "\x1b[48;2;215;95;0m\x1b[38;2;238;238;238m"
 160     s["purpleback"] = "\x1b[48;2;135;95;255m\x1b[38;2;238;238;238m"
 161     s["redback"] = "\x1b[48;2;204;0;0m\x1b[38;2;238;238;238m"
 162 
 163     # resolve aliases
 164     if (a[name] != "") name = a[name]
 165 
 166     # handle unsupported style-names with an error
 167     if (s[name] == "") {
 168         fmt = "\x1b[31munsupported style/color name `%s`\x1b[0m\n"
 169         printf fmt, orig > "/dev/stderr"
 170         exit 1
 171     }
 172 
 173     # match ANSI-code to the name
 174     style = s[name]
 175 }
 176 
 177 # (re)style lines
 178 {
 179     gsub(/\x1b\[[0-9;]*[A-Za-z]/, "")
 180     printf "%s%s\x1b[0m\n", style, $0; fflush()
 181 }
 182 ' "$@"