A script I use to print labels using my Brother QL-800 label printer. Not currently integrated into my NixOS configuration, for one reason or another.

print-label

#! /usr/bin/env nix
#! nix shell nixpkgs#imagemagick nixpkgs#python3Packages.brother-ql nixpkgs#swayimg --command bash

PREVIEW=0
TEXTSIZE=85

while [[ $# -gt 0 ]]; do
	case "$1" in
		-p|--preview)
			PREVIEW=1
			shift
			;;
		-s|--text-size)
			TEXTSIZE="$2"
			shift 2
			;;
		*)
			if [ ! -z "${CAPTION}" ]; then
				>&2 echo "Too many arguments. Usage: $0 <caption>"
				exit 1
			fi
			CAPTION="$1"
			shift
			;;
	esac
done

if [ -z "${CAPTION}" ]; then
	echo "Usage: $0 <caption>"
	exit 1
fi

MAGICK_OPTIONS=(
	-background white
	-fill black
	-pointsize "${TEXTSIZE}"
	-font 'Noto-Serif-Bold'
	-size 696x
	-gravity Center
	"caption:${CAPTION}"
	-extent "696x%[fx:h<150?150:h]"
)

BROTHERQL_OPTIONS=(
	--printer usb://0x04f9:0x209b
	--model QL-800
	print
	--label 62
	--threshold 50
)

if [ "${PREVIEW}" -eq 1 ]; then
	PREVIEW_FILE="$(mktemp).png"
	magick "${MAGICK_OPTIONS[@]}" "PNG:${PREVIEW_FILE}"

	# Display image using swayimg. These terminal sequences will
	# blank/restore the terminal while swayimg is running.
	printf "\e[s\e[?1049h\e[2J\e[H"
	swayimg "${PREVIEW_FILE}"
	printf "\e[?1049l\e[u"

	rm "${PREVIEW_FILE}"
	read -p "Print the label? (y/n): " in
	case $in in
		[Yy]*) echo "OK, printing...";;
		[Nn]*) echo "OK, aborting..."; exit 1;;
		*) echo "Unknown response."; exit 1;;
	esac
fi

magick "${MAGICK_OPTIONS[@]}" PNG:- | brother_ql "${BROTHERQL_OPTIONS[@]}" /dev/stdin