File: stawk.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 # stawk [style] [awk condition...] [filenames...]
  27 #
  28 #
  29 # STyle (lines) satisfying an AWK condition/expression, keeping all other
  30 # lines the same. When not given a condition, all lines are styled.
  31 #
  32 # The colors/styles available are:
  33 #     blue
  34 #     bold
  35 #     gray
  36 #     green
  37 #     inverse
  38 #     magenta
  39 #     orange
  40 #     purple
  41 #     red
  42 #     underline
  43 #
  44 # Some style aliases are:
  45 #     b       blue
  46 #     g       green
  47 #     m       magenta
  48 #     o       orange
  49 #     p       purple
  50 #     r       red
  51 #     u       underline
  52 #     hi      inverse (highlight)
  53 
  54 
  55 # handle leading options
  56 case "$1" in
  57     -h|--h|-help|--help)
  58         awk '/^# +stawk /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  59         exit 0
  60     ;;
  61 esac
  62 
  63 if [ $# -lt 1 ]; then
  64     awk '/^# +stawk /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  65     exit 0
  66 fi
  67 
  68 name="${1:-invert}"
  69 [ $# -gt 0 ] && shift
  70 cond="${1:-1}"
  71 [ $# -gt 0 ] && shift
  72 
  73 awk -v name="${name}" '
  74 BEGIN {
  75     # alias-lookup table
  76     a["r"] = "red"
  77     a["g"] = "green"
  78     a["b"] = "blue"
  79     a["o"] = "orange"
  80     a["p"] = "purple"
  81     a["m"] = "magenta"
  82     a["h"] = "invert"
  83     a["i"] = "invert"
  84     a["u"] = "underline"
  85     a["or"] = "orange"
  86     a["ma"] = "magenta"
  87     a["hi"] = "invert"
  88     a["in"] = "invert"
  89     a["un"] = "underline"
  90     a["inv"] = "invert"
  91     a["mag"] = "magenta"
  92     a["grey"] = "gray"
  93     a["inverse"] = "invert"
  94     a["inverted"] = "invert"
  95     a["hilite"] = "invert"
  96     a["hilited"] = "invert"
  97     a["highlight"] = "invert"
  98     a["highlighted"] = "invert"
  99     a["underlined"] = "underline"
 100     a["bb"] = "blueback"
 101     a["gb"] = "greenback"
 102     a["mb"] = "magentaback"
 103     a["ob"] = "orangeback"
 104     a["pb"] = "purpleback"
 105     a["rb"] = "redback"
 106     a["bg"] = "greenback"
 107     a["bm"] = "magentaback"
 108     a["bo"] = "orangeback"
 109     a["bp"] = "purpleback"
 110     a["br"] = "redback"
 111     a["bluebg"] = "blueback"
 112     a["graybg"] = "grayback"
 113     a["greenbg"] = "greenback"
 114     a["greyback"] = "grayback"
 115     a["greybg"] = "grayback"
 116     a["magentabg"] = "magentaback"
 117     a["orangebg"] = "orangeback"
 118     a["purplebg"] = "purpleback"
 119     a["redbg"] = "redback"
 120     a["magback"] = "magentaback"
 121     a["magbg"] = "magentaback"
 122     a["orback"] = "orangeback"
 123     a["orbg"] = "orangeback"
 124     a["purback"] = "purpleback"
 125     a["purbg"] = "purpleback"
 126 
 127     # style-lookup table
 128     s["red"] = "\x1b[38;2;204;0;0m"
 129     s["green"] = "\x1b[38;2;0;135;95m"
 130     s["blue"] = "\x1b[38;2;0;95;215m"
 131     s["orange"] = "\x1b[38;2;215;95;0m"
 132     s["purple"] = "\x1b[38;2;135;95;255m"
 133     s["magenta"] = "\x1b[38;2;215;0;255m"
 134     s["gray"] = "\x1b[38;2;168;168;168m"
 135     s["bold"] = "\x1b[1m"
 136     s["invert"] = "\x1b[7m"
 137     s["italic"] = "\x1b[3m"
 138     s["strike"] = "\x1b[9m"
 139     s["underline"] = "\x1b[4m"
 140     s["blueback"] = "\x1b[48;2;0;95;215m\x1b[38;2;238;238;238m"
 141     s["grayback"] = "\x1b[48;2;168;168;168m\x1b[38;2;238;238;238m"
 142     s["greenback"] = "\x1b[48;2;0;135;95m\x1b[38;2;238;238;238m"
 143     s["magentaback"] = "\x1b[48;2;215;0;255m\x1b[38;2;238;238;238m"
 144     s["orangeback"] = "\x1b[48;2;215;95;0m\x1b[38;2;238;238;238m"
 145     s["purpleback"] = "\x1b[48;2;135;95;255m\x1b[38;2;238;238;238m"
 146     s["redback"] = "\x1b[48;2;204;0;0m\x1b[38;2;238;238;238m"
 147 
 148     # resolve aliases
 149     if (a[name] != "") {
 150         name = a[name]
 151     }
 152 
 153     if (s[name] == "") {
 154         fmt = "\x1b[31mstyle/color %s not supported\x1b[0m\n"
 155         printf(fmt, name) > "/dev/stderr"
 156         exit 1
 157     }
 158 
 159     style = s[name]
 160     resetstyle = "\x1b[0m" style
 161 }
 162 
 163 { low = lower = tolower($0) }
 164 
 165 '"${cond}"' {
 166     gsub(/\x1b\[0m/, resetstyle)
 167     printf "%s%s\x1b[0m\n", style, $0; fflush()
 168     next
 169 }
 170 
 171 { print; fflush() }
 172 ' "$@"