Create a typewriter text effect using Imagemagick 7

typewriter.sh

#/bin/bash

# Adapted from here https://imagemagick.org/discourse-server/viewtopic.php?p=163774#p163774

# Requires Imagemagick 7 and a monospace font. Tested on Ubuntu 20.04

FONT= # replace with path to monospace font
POINTS=18
COUNT=0
TEXT= # replace textfile.txt with path to plain text file

cat $TEXT | while read LINE
	do magick \
		 -font $FONT \
		-pointsize $POINTS \
		-kerning 1 \
		label:"$LINE" \
		label:"XXXXXXXXXX" \
		-colors 16 \
		-crop "%[fx:round(u.w/(v.w/10))]x1@" \
		-delete -10--1 \
		-background white \
		-coalesce \
		+repage \
		-set delay "%%[fx:t==0||t==(n-1)?75:10]" \
		\( \
			-clone -1,-1,-1,-1 \
			-distort affine "0,%[fx:(t+1)*h/n] 0,0 " \
			-set delay 10 \
		\) \
		-loop 0 \
			_tmp_"$COUNT".miff
	
	COUNT=$(($COUNT+1))
done

magick \
	_tmp_*.miff \
		\( \
			-clone 0--1 \
			+repage \
			-layers merge \
		\) \
	+insert \
	-loop 0 \
		typewriter.gif

	rm _tmp_*.miff