Convert HTML Colors to ANSI esc colors

hexToAnsiColors.sh

#!/bin/bash
hexToAnsiColors() {
  local color_name="$1"
  local hex="$2"

  hex=${hex#"#"}
  r=$(printf '0x%0.2s' "$hex")
  g=$(printf '0x%0.2s' ${hex#??})
  b=$(printf '0x%0.2s' ${hex#????})

  local ansi_code="$(( (r<75?0:(r-35)/40)*6*6 +
                    (g<75?0:(g-35)/40)*6   +
                    (b<75?0:(b-35)/40)     + 16 ))"

  local escape_color=$(printf '\e[38;5;%dm' $ansi_code)
  eval "${color_name}='${escape_color}'"
}

# reds
reds=(
  "IndianRed #CD5C5C"
  "LightCoral #F08080"
  "Salmon #FA8072"
  "DarkSalmon #E9967A"
  "LightSalmon #FFA07A"
  "Crimson #DC143C"
  "Red #FF0000"
  "FireBrick #B22222"
  "DarkRed #8B0000"
)

# pinks
pinks=(
  "Pink #FFC0CB"
  "LightPink #FFB6C1"
  "HotPink #FF69B4"
  "DeepPink #FF1493"
  "MediumVioletRed #C71585"
  "PaleVioletRed #DB7093"
)

# oranges
oranges=(
  "LightSalmon #FFA07A"
  "Coral #FF7F50"
  "Tomato #FF6347"
  "OrangeRed #FF4500"
  "DarkOrange #FF8C00"
  "Orange #FFA500"
)

# yellows
yellows=(
  "Gold #FFD700"
  "Yellow #FFFF00"
  "LightYellow #FFFFE0"
  "LemonChiffon #FFFACD"
  "LightGoldenrodYellow #FAFAD2"
  "PapayaWhip #FFEFD5"
  "Moccasin #FFE4B5"
  "PeachPuff #FFDAB9"
  "PaleGoldenrod #EEE8AA"
  "Khaki #F0E68C"
  "DarkKhaki #BDB76B"
)

# purples
purples=(
  "Lavender #E6E6FA"
  "Thistle #D8BFD8"
  "Plum #DDA0DD"
  "Violet #EE82EE"
  "Orchid #DA70D6"
  "Fuchsia #FF00FF"
  "Magenta #FF00FF"
  "MediumOrchid #BA55D3"
  "MediumPurple #9370DB"
  "RebeccaPurple #663399"
  "BlueViolet #8A2BE2"
  "DarkViolet #9400D3"
  "DarkOrchid #9932CC"
  "DarkMagenta #8B008B"
  "Purple #800080"
  "Indigo #4B0082"
  "SlateBlue #6A5ACD"
  "DarkSlateBlue #483D8B"
  "MediumSlateBlue #7B68EE"
)

# greens
greens=(
  "GreenYellow #ADFF2F"
  "Chartreuse #7FFF00"
  "LawnGreen #7CFC00"
  "Lime #00FF00"
  "LimeGreen #32CD32"
  "PaleGreen #98FB98"
  "LightGreen #90EE90"
  "MediumSpringGreen #00FA9A"
  "SpringGreen #00FF7F"
  "MediumSeaGreen #3CB371"
  "SeaGreen #2E8B57"
  "ForestGreen #228B22"
  "Green #008000"
  "DarkGreen #006400"
  "YellowGreen #9ACD32"
  "OliveDrab #6B8E23"
  "Olive #808000"
  "DarkOliveGreen #556B2F"
  "MediumAquamarine #66CDAA"
  "DarkSeaGreen #8FBC8B"
  "LightSeaGreen #20B2AA"
  "DarkCyan #008B8B"
  "Teal #008080"
)

# blues
blues_and_cyans=(
  "Aqua #00FFFF"
  "Cyan #00FFFF"
  "LightCyan #E0FFFF"
  "PaleTurquoise #AFEEEE"
  "Aquamarine #7FFFD4"
  "Turquoise #40E0D0"
  "MediumTurquoise #48D1CC"
  "DarkTurquoise #00CED1"
  "CadetBlue #5F9EA0"
  "SteelBlue #4682B4"
  "LightSteelBlue #B0C4DE"
  "PowderBlue #B0E0E6"
  "LightBlue #ADD8E6"
  "SkyBlue #87CEEB"
  "LightSkyBlue #87CEFA"
  "DeepSkyBlue #00BFFF"
  "DodgerBlue #1E90FF"
  "CornflowerBlue #6495ED"
  "MediumSlateBlue #7B68EE"
  "RoyalBlue #4169E1"
  "Blue #0000FF"
  "MediumBlue #0000CD"
  "DarkBlue #00008B"
  "Navy #000080"
  "MidnightBlue #191970"
)

# browns
browns=(
  "Cornsilk #FFF8DC"
  "BlanchedAlmond #FFEBCD"
  "Bisque #FFE4C4"
  "NavajoWhite #FFDEAD"
  "Wheat #F5DEB3"
  "BurlyWood #DEB887"
  "Tan #D2B48C"
  "RosyBrown #BC8F8F"
  "SandyBrown #F4A460"
  "Goldenrod #DAA520"
  "DarkGoldenrod #B8860B"
  "Peru #CD853F"
  "Chocolate #D2691E"
  "SaddleBrown #8B4513"
  "Sienna #A0522D"
  "Brown #A52A2A"
  "Maroon #800000"
)

# whites
whites=(
  "White #FFFFFF"
  "Snow #FFFAFA"
  "HoneyDew #F0FFF0"
  "MintCream #F5FFFA"
  "Azure #F0FFFF"
  "AliceBlue #F0F8FF"
  "GhostWhite #F8F8FF"
  "WhiteSmoke #F5F5F5"
  "SeaShell #FFF5EE"
  "Beige #F5F5DC"
  "OldLace #FDF5E6"
  "FloralWhite #FFFAF0"
  "Ivory #FFFFF0"
  "AntiqueWhite #FAEBD7"
  "Linen #FAF0E6"
  "LavenderBlush #FFF0F5"
  "MistyRose #FFE4E1"
)

# grays
grays=(
  "Gainsboro #DCDCDC"
  "LightGray #D3D3D3"
  "Silver #C0C0C0"
  "DarkGray #A9A9A9"
  "Gray #808080"
  "DimGray #696969"
  "LightSlateGray #778899"
  "SlateGray #708090"
  "DarkSlateGray #2F4F4F"
  "Black #000000"
)

colors=(
  "${reds[@]}"
  "${pinks[@]}"
  "${oranges[@]}"
  "${yellows[@]}"
  "${purples[@]}"
  "${greens[@]}"
  "${blues_and_cyans[@]}"
  "${browns[@]}"
  "${whites[@]}"
  "${grays[@]}"
)

for color_data in "${colors[@]}"; do
    IFS=$' ' read -r color_name hex_code <<< "$color_data"
    hexToAnsiColors "$color_name" "$hex_code"
done

Hex color to ANSI conversion

This file contains a list of HTML color in hex format. Which are then converted to their ANSI escape equivalent.
List of color names and value are from here https://htmlcolorcodes.com/color-names/

Usage

• Save this file somewhere
• Source it into your bash file
  • ex: source ./colors.sh
• Use it somewhere
  • ex: echo -e ${FireBrick}N${nc} Fire Brick Red.${nc}