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122 lines
2.4 KiB
Go
122 lines
2.4 KiB
Go
package fs
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// SizeSuffix is parsed by flag with k/M/G suffixes
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import (
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"fmt"
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"math"
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"strconv"
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"strings"
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"github.com/pkg/errors"
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)
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// SizeSuffix is an int64 with a friendly way of printing setting
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type SizeSuffix int64
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// Turn SizeSuffix into a string and a suffix
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func (x SizeSuffix) string() (string, string) {
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scaled := float64(0)
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suffix := ""
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switch {
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case x < 0:
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return "off", ""
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case x == 0:
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return "0", ""
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case x < 1<<10:
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scaled = float64(x)
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suffix = ""
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case x < 1<<20:
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scaled = float64(x) / (1 << 10)
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suffix = "k"
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case x < 1<<30:
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scaled = float64(x) / (1 << 20)
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suffix = "M"
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case x < 1<<40:
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scaled = float64(x) / (1 << 30)
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suffix = "G"
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case x < 1<<50:
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scaled = float64(x) / (1 << 40)
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suffix = "T"
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default:
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scaled = float64(x) / (1 << 50)
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suffix = "P"
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}
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if math.Floor(scaled) == scaled {
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return fmt.Sprintf("%.0f", scaled), suffix
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}
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return fmt.Sprintf("%.3f", scaled), suffix
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}
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// String turns SizeSuffix into a string
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func (x SizeSuffix) String() string {
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val, suffix := x.string()
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return val + suffix
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}
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// Unit turns SizeSuffix into a string with a unit
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func (x SizeSuffix) Unit(unit string) string {
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val, suffix := x.string()
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if val == "off" {
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return val
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}
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return val + " " + suffix + unit
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}
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// Set a SizeSuffix
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func (x *SizeSuffix) Set(s string) error {
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if len(s) == 0 {
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return errors.New("empty string")
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}
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if strings.ToLower(s) == "off" {
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*x = -1
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return nil
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}
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suffix := s[len(s)-1]
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suffixLen := 1
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var multiplier float64
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switch suffix {
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case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '.':
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suffixLen = 0
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multiplier = 1 << 10
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case 'b', 'B':
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multiplier = 1
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case 'k', 'K':
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multiplier = 1 << 10
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case 'm', 'M':
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multiplier = 1 << 20
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case 'g', 'G':
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multiplier = 1 << 30
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case 't', 'T':
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multiplier = 1 << 40
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case 'p', 'P':
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multiplier = 1 << 50
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default:
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return errors.Errorf("bad suffix %q", suffix)
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}
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s = s[:len(s)-suffixLen]
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value, err := strconv.ParseFloat(s, 64)
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if err != nil {
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return err
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}
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if value < 0 {
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return errors.Errorf("size can't be negative %q", s)
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}
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value *= multiplier
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*x = SizeSuffix(value)
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return nil
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}
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// Type of the value
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func (x *SizeSuffix) Type() string {
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return "int64"
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}
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// Scan implements the fmt.Scanner interface
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func (x *SizeSuffix) Scan(s fmt.ScanState, ch rune) error {
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token, err := s.Token(true, nil)
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if err != nil {
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return err
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}
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return x.Set(string(token))
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}
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