Uses images from https://github.com/LazoCoder/Pokemon-Terminal with rxvt

pokerxvt.sh

#!/bin/bash

function rxvt_set_bg { #arg: filename
	FILE="$(realpath "$1")"
	BGDATA="$(convert "$FILE" -crop '1x1+0+0' txt:-)" #get color of top-left pixel for background

	RGB="$(echo "$BGDATA" | grep -P -o '(?<=\().*(?=\))')"
	R="$(echo "$RGB" | awk -F ',' '{print $1}')" #get value of each
	G="$(echo "$RGB" | awk -F ',' '{print $2}')" #color to determine
	B="$(echo "$RGB" | awk -F ',' '{print $3}')" #if background is dark or bright

	RGBSUM="$(( $R + $G + $B ))"
	BGPIXEL="$(echo "$BGDATA" | grep -o '#.*')"

	#echo "File is $FILE"
	#echo "RGB is $RGB -- $RGBSUM"
	#echo "BG pixel is $BGPIXEL"

	echo -ne "\e]11;$BGPIXEL\a\e]20;$FILE;100x100+100+100:op=keep-aspect\a"

	if (("$RGBSUM" < 384)); then
		echo -ne "\e]10;#ffffff\a\e]705;#ffffff\a" #dark, use white text
	else
		echo -ne "\e]10;#000000\a\e]705;#000000\a" #bright, use black text
	fi
}

function load_by_number { #arg: number of pokemon
	PADNUM="$(printf "%03d" "$1")"
	IMG="$(find . -name "$PADNUM".png)"

	if [ -z "$IMG" ]; then
		echo "Couldn't find an image for #$NUMBER."
		exit 1
	fi

	rxvt_set_bg "$IMG"
}

function load_by_name { #arg: name of pokemon
	NUMBER="$(grep -i $INPUT Data/pokemon.txt | awk '{print $1}')"
	if [ "$NUMBER" == 0 ] ; then
		echo "Couldn't find an image for $INPUT."
		exit 1
	fi
	load_by_number "$NUMBER"
}

function load_random {
	RNDNUM="$(shuf -n 1 Data/pokemon.txt | awk '{print $1}')"
	load_by_number "$RNDNUM"
}

if [[ $# -lt 1 ]]; then
        echo "This program requires an argument -- either a Pokémon's name, its number, or the word 'random'."
fi

INPUT=$1

if [[ $INPUT == "random" ]]; then
	load_random
elif [[ $INPUT =~ ^[0-9]+$ ]] ; then
	load_by_number $1
else
	load_by_name $1
fi

./setbg.sh "$IMG"