#!/bin/bash
# ANSI color table that relates to RGB (NOT true RGB)
# Haters gonna hate
# Written by Robert J.

#	     _/  _/    _/  _/                            _/
#	  _/_/_/_/_/  _/  _/_/_/      _/_/_/    _/_/_/  _/_/_/
#	   _/  _/    _/  _/    _/  _/    _/  _/_/      _/    _/
#	_/_/_/_/_/      _/    _/  _/    _/      _/_/  _/    _/
#	 _/  _/   _/   _/_/_/      _/_/_/  _/_/_/    _/    _/

# Display help
[[ $1 = "--help" ]] && {
    printf "\n"
    printf "\tansi-color --table : Outputs table of 216 escaped colors with approx RGB\n"
    printf "\tansi-color -RGB RED GREEN BLUE {0-255} : Closest ANSI color with escape code\n"
    printf "\n"
    exit
}

[[ $1 = "--table" ]] && {
    # Set variables to 0
    r=0
    g=0
    b=0

    # Initiate while loop
    while : ;
    do
        # Starting with red (RGB)
        for ((r=0;r<6;r++));
        do
            # Perform color calculations
            color=$((16+36*r+6*g+b));
            # Print Color with RGB structure tabbing at the completion
            printf "\033[38;5; %s m$r,$g,$b;\033[0;00m color code: %s \t" "$color" "$color";
        done;
        # perform a line return after the first set of red is completed
        printf "\n"
        # Increase blue by one incriment
        ((b++)) && {
            # Reset bule to zero if it equals 6
            [[ $b = 6 ]] && b=0 && {
                # Increase green by one incriment until it equals 6 at which point,
                # break the while loop
                ((g++)) && [[ $g = 6 ]] && break;
            }
        }
    done;
    exit;
}

# Error Checking
[[ $# != 4 ]] && {
    printf "Syntax Error: Missing Operator see:\n\tansi-color --help\n"
    exit
}