Change sb-price to allow custom currency (#963)

e.g:
price <url> <Name of currency> <icon> <Price to show in>
price btc Bitcoin "" gbp

.local/bin/statusbar/sb-price

@@ -1,19 +1,22 @@
 #!/bin/sh
 
 # Usage:
-#	price <url> <Name of currency> <icon>
+#	price <url> <Name of currency> <icon> <Price to show in>
 #	price bat "Basic Attention Token" 🦁
 # When the name of the currency is multi-word, put it in quotes.
 
 [ -z "$3" ] && exit 1
+
+# use $4 as currency, if not passed in use "usd" as default
+currency="${4:-usd}"
 interval="@14d"	# History contained in chart preceded by '@' (7d = 7 days)
 dir="${XDG_DATA_HOME:-$HOME/.local/share}/crypto-prices"
 pricefile="$dir/$1"
 chartfile="$dir/$1-chart"
 
 updateprice() { ping -q -c 1 example.org >/dev/null 2>&1 &&
-	curl -s "rate.sx/1$1" > "$pricefile" &&
-	curl -s "rate.sx/$1$interval" > "$chartfile" ;}
+	curl -s "$currency.rate.sx/1$1" > "$pricefile" &&
+	curl -s "$currency.rate.sx/$1$interval" > "$chartfile" ;}
 
 [ -d "$dir" ] || mkdir -p "$dir"
 
@@ -35,4 +38,4 @@ case $BLOCK_BUTTON in
 	6) "$TERMINAL" -e "$EDITOR" "$0" ;;
 esac
 
-printf "$3$%0.2f" "$(cat "$pricefile")"
+printf "$3%0.2f$currency" "$(cat "$pricefile")"