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amount.go
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/
amount.go
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// Copyright (c) 2015-2016 The btcsuite developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package cfgutil
import (
"strconv"
"strings"
"github.com/btcsuite/btcd/btcutil"
)
// AmountFlag embeds a btcutil.Amount and implements the flags.Marshaler and
// Unmarshaler interfaces so it can be used as a config struct field.
type AmountFlag struct {
btcutil.Amount
}
// NewAmountFlag creates an AmountFlag with a default btcutil.Amount.
func NewAmountFlag(defaultValue btcutil.Amount) *AmountFlag {
return &AmountFlag{defaultValue}
}
// MarshalFlag satisfies the flags.Marshaler interface.
func (a *AmountFlag) MarshalFlag() (string, error) {
return a.Amount.String(), nil
}
// UnmarshalFlag satisfies the flags.Unmarshaler interface.
func (a *AmountFlag) UnmarshalFlag(value string) error {
value = strings.TrimSuffix(value, " BTC")
valueF64, err := strconv.ParseFloat(value, 64)
if err != nil {
return err
}
amount, err := btcutil.NewAmount(valueF64)
if err != nil {
return err
}
a.Amount = amount
return nil
}