Improve formatting of profit columns

cointop/portfolio.go

@@ -346,8 +346,7 @@ func (ct *Cointop) GetPortfolioTable() *table.Table {
 					costPrice, err := ct.Convert(coin.BuyCurrency, ct.State.currencyConversion, coin.BuyPrice)
 					if err == nil {
 						profit := (coin.Price - costPrice) * coin.Holdings
-						profit = math.Round(100*profit) / 100 // cheesy round
-						text = ct.FormatPrice(profit)
+						text = humanize.FixedMonetaryf(profit, 2)
 					} else {
 						text = "?"
 					}

cointop/table_header.go

@@ -231,7 +231,7 @@ func (ct *Cointop) UpdateTableHeader() error {
 		}
 		leftAlign := ct.GetTableColumnAlignLeft(col)
 		switch col {
-		case "price", "balance":
+		case "price", "balance", "profit":
 			label = fmt.Sprintf("%s%s", ct.CurrencySymbol(), label)
 		}
 		if leftAlign {

pkg/humanize/humanize.go

@@ -34,6 +34,11 @@ func Monetaryf(value float64, precision int) string {
 	return f(value, precision, "LC_MONETARY", false)
 }
 
+// FixedMonetaryf produces a fixed-precision monetary-value string. See Monetaryf.
+func FixedMonetaryf(value float64, precision int) string {
+	return f(value, precision, "LC_MONETARY", true)
+}
+
 // borrowed from go-locale/util.go
 func splitLocale(locale string) (string, string) {
 	// Remove the encoding, if present