Generate QR code

qr.zsh

#!/usr/bin/env zsh

# Make sure we have all the utilities we need
requiredBins=('qrencode' 'feh')

if [[ `uname` == "Darwin" ]]; then	
	requiredBins+=("pbpaste")
else
	requiredBins+=("xclip")
fi

missingBins=()

for cmd in $requiredBins
do
	if ! which $cmd > /dev/null; then
		missingBins+=($cmd)	
	fi
done

if [ ${#missingBins[@]} -gt 0 ]; then
	IFS=","
	echo "OOPS! Missing $missingBins"
	exit 1
fi

# Clipboard paste function which works on Mac and Linux
paste() {
	if which pbpaste > /dev/null; then
		pbpaste
	else
		xclip -selection clipboard -o
	fi
}

# Try using the command line argument as the QR source text
sourceText=$1

if (( # == 0 )); then
	# No argument. Grab from clipboard instead
	sourceText=$(paste)	
fi 

# Convert the text to a QR code and display it with feh
echo $sourceText | qrencode --size=15 -o - | feh -