lsd-sim

#!/bin/bash

# Global Variables
# Setting rows and width equal to the terminal size.
# Decrementing $rows, as more number of rows cause the screen to scroll. Which we don't want.
rows=$(tput lines);
rows=$rows-2;

width=$(tput cols);

widthOffset=0;
cringe=false;

# Initial clear
printf "\033c"

# Take the user parameters. 
while test $# -gt 0; do
	case "$1" in
		-d | --dry-run)
			echo $rows;
			exit;
			shift;
			;;

		-r | --rows)
			shift
			rows=$1
			shift
			;;

		-w | --width)
			shift
			width=$1
			shift
			;;

		-o | --offset)
			shift
			widthOffset=$1
			shift
			;;

		-c | --cringe)
			shift
			cringe=true;
			;;

		*)
			echo "$1 is not a recognized flag!"
			exit 1;
			;;
	esac
done  

# Clear screen first
printf "\033c";

# An infinite loop.
for((j=1; j<3;)); do

	for((row=0; row<rows;  row++)) do

		for((k=0; k<widthOffset; k++)); do
			printf " ";
		done

		if ! $cringe ; then
			i=$((16 + RANDOM/256))
		fi
		
		for((k=0; k<width; k++)); do

			# Add some cringe. 
			if $cringe ; then
				i=$((16 + RANDOM/256))
			fi
			
			# Do the magic
			printf "\e[48;5;%sm " "$i";
			printf '\e[0m';
			[ ! $(((${i} - 15) % 6)) -eq 0 ] && printf '';
		done

		printf '\n';
	done

	# Delay to print the colours.
	sleep .001;

	# Resets the cursor to (1, 1). Much better than deleting the previous lines or clearing the screen.
	printf "\033[1;1H"

done