106 lines
1.9 KiB
Go
106 lines
1.9 KiB
Go
package main
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import (
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"errors"
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"strconv"
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"strings"
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)
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// Sizes implements flag.Value for collecting byte counts
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type Sizes struct {
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Default []Size
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Custom []Size
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}
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// Sizes returns the loaded values
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func (sizes Sizes) Sizes() []Size {
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if len(sizes.Custom) > 0 {
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return sizes.Custom
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}
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return sizes.Default
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}
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// String converts values to a string
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func (sizes Sizes) String() string {
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sz := sizes.Sizes()
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xs := make([]string, len(sz))
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for i, size := range sz {
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xs[i] = size.String()
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}
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return strings.Join(xs, " ")
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}
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// Set adds values from byte values
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func (sizes *Sizes) Set(s string) error {
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for _, x := range strings.Fields(s) {
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var size Size
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if err := size.Set(x); err != nil {
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return err
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}
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sizes.Custom = append(sizes.Custom, size)
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}
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return nil
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}
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// Size represents a value of bytes
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type Size struct {
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bytes int64
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}
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type unit struct {
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suffix string
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scale float64
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}
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var units = []unit{
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{"T", 1 << 40},
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{"G", 1 << 30},
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{"M", 1 << 20},
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{"K", 1 << 10},
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{"B", 1},
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{"", 0},
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}
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// String converts size to a string
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func (size Size) String() string {
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if size.bytes <= 0 {
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return "0"
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}
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v := float64(size.bytes)
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for _, unit := range units {
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if v >= unit.scale {
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r := strconv.FormatFloat(v/unit.scale, 'f', 1, 64)
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r = strings.TrimSuffix(r, "0")
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r = strings.TrimSuffix(r, ".")
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return r + unit.suffix
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}
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}
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return strconv.Itoa(int(size.bytes)) + "B"
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}
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// Set updates value from string
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func (size *Size) Set(s string) error {
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if s == "" {
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return errors.New("empty size")
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}
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value, suffix := s[:len(s)-1], s[len(s)-1]
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if '0' <= suffix && suffix <= '9' {
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suffix = 'B'
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value = s
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}
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for _, unit := range units {
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if unit.suffix == string(suffix) {
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v, err := strconv.ParseFloat(value, 64)
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if err != nil {
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return err
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}
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size.bytes = int64(v * unit.scale)
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return nil
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}
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}
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return errors.New("unknown suffix " + string(suffix))
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}
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