script to decode qr code from a screenshot

qrshot.sh

#!/usr/bin/env bash
#
# Siddharth Dushantha 2022
# 
# https://github.com/sdushantha/bin
#

image_file="/tmp/ocr.png"

# Check if the needed dependencies are installed
dependencies=(maim notify-send zbarimg xclip)
for dependency in "${dependencies[@]}"; do
    type -p "$dependency" &>/dev/null || {
        # The reason why we are sending the error as a notification is because
        # user is most likely going to run this script by binding it to their
        # keyboard, therefor they cant see any text that is outputed using echo
        notify-send "ocr" "Could not find '${dependency}', is it installed?"
        echo "Could not find '${dependency}', is it installed?"
        exit 1
    }
done

# Take screenshot by selecting the area
maim -s "$image_file"

# Get the exit code of the previous command.
# So in this case, it is the screenshot command. If it did not exit with an
# exit code 0, then it means the user canceled the process of taking a
# screenshot by doing something like pressing the escape key
status=$?

# If the user pressed the escape key or did something to terminate the proccess
# taking a screenshot, then just exit
[ $status -ne 0 ] && exit 1

# Use zbarimg to decode the text from the QR code
decoded_text=$(zbarimg "$image_file" -q --raw)

if [ -z "$decoded_text" ]; then
    notify-send "qrshot" "no text was detected"
    rm $image_file && exit 1
fi

# Copy text to clipboard
printf %b "$decoded_text" | xclip -selection clip

# Let us know that something was decoded
notify-send "qrshot" "$decoded_text"

# Cleaning up the trash that was left behind
rm $image_file