A basic fetcher for ANZ bank loan rates

anz.rates.sh

#!/usr/bin/env bash

## NOTE(evo): `brew install jq`

if test -z "$JQ_BIN"; then
	hash jq 2>/dev/null || { echo "jq is required: brew install jq"; exit 1; }
fi

test -z "$JQ_BIN" && JQ_BIN=jq

test -z "$TMPDIR" && TMPDIR=/tmp
test -z "$OUTFILE" && OUTFILE="$TMPDIR/anz.js"
test -z "$BAKFILE" && BAKFILE="$TMPDIR/anz.old.js"

find "$OUTFILE" -mmin +120 -exec mv "$OUTFILE" "$BAKFILE" \; 2>/dev/null

if test ! -e "$OUTFILE"; then
	curl -Ls "https://www.anz.com/productdata/productdata.asp?output=json&callback=callbackFunction&country=AU&section=&subsection=" | \
	tail -c +18 | \ # remove `callbackFunction(` from beginning of file
	sed 's/.$//' > "$OUTFILE" # remove `)` from end of file

	test -e "$BAKFILE" && \
		diff -q "$BAKFILE" "$OUTFILE" >/dev/null 2>&1 && \
		echo "No changes" || \
		echo "Found changes"
fi

CODE=$(cat <<-EOF

	.productdata[].country[].interestrates[].section[] |
	select(.code == "PHL").subsection | # personal home loans only
	map(
		select(.code | test("^(FRB|VR)\$")) | # fixed or variable rates only
		(
			{ name } +
			(.baserate |
				map(
					select(.code | test("^(FRB[0-3]|VR)I$")) # 0 to 3 years fixed or variable rate only
				) |
				map({
						rate: .ratevalue|tonumber,
						type: (if .tiername1 != "" then .tiername1 else .ratename end)
				})[]
			)
		)
	)

EOF
)

jq "$CODE" "$OUTFILE"