lightning/contrib/lightning-pay

#! /bin/sh -e
# A terrible script to make a payment.

if [ $# -ne 3 ]; then
    echo "Usage: <destination-id> <amount-in-milli-satoshi> <payment-hash>" >&2
    exit 1
fi
DEST="$1"
AMOUNT="$2"
PHASH="$3"

if ROUTE=`cli/lightning-cli getroute $DEST $AMOUNT 1`; then
    # Strip down to raw array.
    ROUTE=`echo $ROUTE | sed 's/^{ "route" : \(.*\) }$/\1/'`
    # Get first amount.
    PAID=`echo $ROUTE | tr , '\012' | sed -n 's/.*msatoshi[^0-9]*\([0-9]*\).*/\1/p' | head -n1`
    echo -n "Paying fee $(($PAID - $AMOUNT)) on $AMOUNT ("`echo "scale=3; ($PAID - $AMOUNT) * 100 / $AMOUNT" | bc`"%).  Send [Y/n]? "
    read REPLY
    case $REPLY in
	""|y*|Y)
	    cli/lightning-cli sendpay "$ROUTE" "$PHASH"
	    exit
	    ;;
	*)
	    echo Not sending.
	    exit 1
	    ;;
    esac
else
    echo Routing failed >&2
    exit 1
fi