.bash_colors

#!/bin/bash
# Set bash color schemes and provide color utilities
# Be aware that these colors may not work on all terminals (in that case, see `tput`)

export COLOR_NORMAL='\e[0m'

# 4-bit colors
declare -A colors_4bit
colors_4bit["BLACK"]=30
colors_4bit["MAROON"]=31
colors_4bit["GREEN"]=32
colors_4bit["OLIVE"]=33
colors_4bit["NAVY"]=34
colors_4bit["PURPLE"]=35
colors_4bit["TEAL"]=36
colors_4bit["SILVER"]=37
colors_4bit["GRAY"]=90
colors_4bit["RED"]=91
colors_4bit["LIME"]=92
colors_4bit["YELLOW"]=93
colors_4bit["BLUE"]=94
colors_4bit["FUSCHIA"]=95
colors_4bit["AQUA"]=96
colors_4bit["WHITE"]=97
for color in ${!colors_4bit[@]}; do
  export COLOR_${color}_FG="\e[0;${colors_4bit[$color]}m"
  export COLOR_${color}_BG="\e[0;$((${colors_4bit[$color]}+10))m"
  export COLOR_${color}_FG_BOLD="\e[1;${colors_4bit[$color]}m"
  export COLOR_${color}_BG_BOLD="\e[1;$((${colors_4bit[$color]}+10))m"
done

term_color=$(echo $TERM | cut -d'-' -f2)
if [ $term_color != "256color" ]; then
  # 256 Colors named according to the closest "Name that Color" match
  # (https://chir.ag/projects/name-that-color)
  declare -A colors
  colors["BLACK"]=0  # ------------ #000000
  colors["MAROON"]=1  # ----------- #800000
  colors["JAPANESE_LAUREL"]=2  # -- #008000
  colors["YELLOW"]=3  # ----------- #ffff00
  colors["MALIBU"]=81  # ---------- #5fd7ff
  colors["CHARTREUSE"]=118  # ----- #87ff00
  for color in ${!colors[@]}; do
    export COLOR_${color}_FG=$"\e[38;5;${colors[$color]}m"
    export COLOR_${color}_BG=$"\e[48;5;${colors[$color]}m"
  done
fi


# Print a grid of the available colors
# (adapted from Plasmarob: https://unix.stackexchange.com/a/285956)
colorgrid() {
  local counter=16
  while [ $counter -lt 52 ]; do
    for column in {0..6}; do
      local code=$(( $counter+$column*36 ))
      if [ $column -eq 6 ] && [ $code -gt 250 ]; then (( code-=251 )); fi
      printf "   \033[38;5;${code}m█ %03d" $code
    done
    (( counter += 1 ))
    printf '\r\n'
  done
}


rainbowgrid() {
  # https://www.hackitu.de/termcolor256/#rainbow_colors_palette
  echo "Rainbow grid not yet implemented"
}