Create a QR code for wifi

qrcode-wifi.sh

#!/usr/bin/env bash

#
# Inspired by http://www.commandlinefu.com/commands/view/13028
#
# Author: Florian Goße <florian@essog.de>
# Date: 2014-01-22
#

# Check if executed in a terminal
if [[ -t 0 ]];
then
    # Check if $DISPLAY exists
    if [[ -z "$DISPLAY" ]];
    then
        echo "Cannot open display"
        exit 1;
    else
        echo "Open on display $DISPLAY"
    fi
fi

# Check if zenity and qrencode exists
hash zenity 2>/dev/null || { echo "Please install zenity"; exit 1; }
hash qrencode 2>/dev/null || { echo "Please install qrencode"; exit 1; }

# Enter network ssid
enter_network_name() {
    zenity \
        --entry \
        --text="Network name (SSID)" \
        --title="Create WiFi QR";
}

# Enter password
enter_password() {
    zenity \
        --password \
        --title="Wifi Password";
}

# Select output file
select_file() {
    zenity \
        --file-selection \
        --save \
        --filename="${HOME}/qr-wifi.png" \
        --confirm-overwrite \
        --file-filter="*.png*" \
        --title="Save as ...";
}

NETWORK_NAME=$(enter_network_name);
[[ -z "$NETWORK_NAME" ]] && exit 1;

PASSWORD=$(enter_password);
[[ -z "$PASSWORD" ]] && exit 1;

FILE=$(select_file);
[[ -z "$FILE" ]] && exit 1;

# Generate png
qrencode --level=H --size=7 --output="${FILE}" "WIFI:S:${NETWORK_NAME};T:WPA;P:${PASSWORD};;"