git ssb

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#!/bin/sh
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# ust-bonds-interest - get interest on treasury bonds
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get_value() {
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	wget -qO- \
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		"http://www.treasurydirect.gov/BC/SBCPrice?$query&RedemptionDate=$1" |\
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		sed -n '/colspan="6"/!d; n; n; n; n
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			s/.*<td>//; s/<\/td.*//; s/[$,]//g; p'
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}
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get_diff() {
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	query="${BONDS_QUERY?BONDS_QUERY env var must be set}"
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	amt1=$(get_value $1)
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	amt2=$(get_value $2)
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	echo \$$(echo $amt2 - $amt1 | bc -l)
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}
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usage() {
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	echo Usage: $0 start_date end_date
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	echo Date format: mm/yyyy
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}
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case $# in
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	0) usage;;
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	2) get_diff $@;;
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	*) usage >&2; exit 1;;
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esac
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