_gui_create_invoice.sh

#!/bin/bash

function usage() {
  echo -e "This script generates a LND invoice and prints the payment request"
  echo -e ""
  echo -e "Usage: $0 [-h|--help] [-v*|--verbose] [-a|--amt STRING] [-m|--memo STRING]"
  echo -e ""
  echo -e "  -h, --help\t\tprint this help message"
  echo -e "  -v, --verbose\t\tbe more verbose"
  echo -e "  -a, --amt STRING\tAmount in Satoshi"
  echo -e "  -m, --memo STRING\tMemo to add to invoice"
  echo -e ""
}

function check_program() {
  command -v $1 >/dev/null 2>&1 || { echo >&2 "The program $1 is required but not installed.  Aborting."; exit 1; }
}

# Default Values
verbose=0
amt=0
memo=""

while [[ "$1" == -* ]]; do
  case "$1" in
    -h|--help)
      usage
      exit 0
      ;;
    -v*)
      (( verbose += ${#1} - 1 ))
      ;;
    --verbose)
      (( verbose++ ))
      ;;
    -a|--amt)
      shift
      amt="$1"
      ;;
    -m|--memo)
      shift
      memo="$1"
      ;;
    --)
      shift
      break
      ;;
    *)
    echo "Unrecognized option $1."
    echo ""
    usage
    exit 1
    ;;
  esac
  shift
done

if ! [[ "$amt" =~ ^[[:digit:]]+$ ]]; then
  echo "Error: amt must be a positive integer or 0." >&2
  exit 1
fi

if [[ ${memo//[^[:space:]]} ]]; then
  echo "Error: '${memo}' contains a space"
  exit 1
fi

# CONFIGFILE - configuration of RaspiBlitz
configFile="/mnt/hdd/raspiblitz.conf"
configExists=$(ls ${configFile} 2>/dev/null | grep -c '.conf')
if [ ${configExists} -eq 1 ]; then
  source ${configFile}
else
  echo "file not found: ${configFile}!"
  exit 1
fi

# make sure required programs are installed
check_program jq
check_program lncli

## SETUP DONE

amt_flag=""
if [ "$amt" -ne "0" ]; then
  amt_flag=" --amt=${amt}"
fi

if [ ! -z "$memo" ]; then
  memo_flag=" --memo=${memo}"
fi

ln_result=$(sudo -u bitcoin /usr/local/bin/lncli --chain=${network} --network=${chain}net addinvoice ${amt_flag} ${memo_flag} 2>/dev/null)
#payReq=$(echo "${ln_result}" | jq .pay_req | sed s/\"//g)
#echo ${payReq}
echo ${ln_result}