ImageMagick Shell Command for Discount Codes

moo-code

#!/bin/sh
#
# Uses ImageMagick to add text to an image based on Graham Ashton's Gist: https://github.com/gma/moo-card-codes.

COLOR="${COLOR:-black}"
FONT="${FONT:-Courier-Bold}"
FONT_SIZE="${FONT_SIZE:-31}"
TEMPLATE="${TEMPLATE:-template.jpg}"
TEXT_POSITION_X="${TEXT_POSITION_x:-+450}"
TEXT_POSITION_Y="${TEXT_POSITION_Y:-+365}"

## Main program

[ -n "$DEBUG" ] && set -x

let i=1
read CODE
while [ -n "$CODE" ]; do
    OUTPUT="card-$(printf '%03d' $i).jpg"
    echo "Creating $OUTPUT with code $CODE"
    convert $TEMPLATE -pointsize $FONT_SIZE -fill $COLOR -font $FONT -annotate $TEXT_POSITION_X$TEXT_POSITION_Y $CODE $OUTPUT
    let i=i+1
    read CODE
done