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flagset.go
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flagset.go
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package flagset
import (
"flag"
"fmt"
"math/big"
"strings"
"time"
)
type Flagset struct {
flags []*FlagVar
set *flag.FlagSet
}
func NewFlagSet(name string) *Flagset {
f := &Flagset{
flags: []*FlagVar{},
set: flag.NewFlagSet(name, flag.ContinueOnError),
}
return f
}
type FlagVar struct {
Name string
Usage string
}
func (f *Flagset) addFlag(fl *FlagVar) {
f.flags = append(f.flags, fl)
}
func (f *Flagset) Help() string {
str := "Options:\n\n"
items := []string{}
for _, item := range f.flags {
items = append(items, fmt.Sprintf(" -%s\n %s", item.Name, item.Usage))
}
return str + strings.Join(items, "\n\n")
}
func (f *Flagset) Parse(args []string) error {
return f.set.Parse(args)
}
func (f *Flagset) Args() []string {
return f.set.Args()
}
type BoolFlag struct {
Name string
Usage string
Default bool
Value *bool
}
func (f *Flagset) BoolFlag(b *BoolFlag) {
f.addFlag(&FlagVar{
Name: b.Name,
Usage: b.Usage,
})
f.set.BoolVar(b.Value, b.Name, b.Default, b.Usage)
}
type StringFlag struct {
Name string
Usage string
Default string
Value *string
}
func (f *Flagset) StringFlag(b *StringFlag) {
f.addFlag(&FlagVar{
Name: b.Name,
Usage: b.Usage,
})
f.set.StringVar(b.Value, b.Name, b.Default, b.Usage)
}
type IntFlag struct {
Name string
Usage string
Value *int
Default int
}
func (f *Flagset) IntFlag(i *IntFlag) {
f.addFlag(&FlagVar{
Name: i.Name,
Usage: i.Usage,
})
f.set.IntVar(i.Value, i.Name, i.Default, i.Usage)
}
type Uint64Flag struct {
Name string
Usage string
Value *uint64
Default uint64
}
func (f *Flagset) Uint64Flag(i *Uint64Flag) {
f.addFlag(&FlagVar{
Name: i.Name,
Usage: i.Usage,
})
f.set.Uint64Var(i.Value, i.Name, i.Default, i.Usage)
}
type BigIntFlag struct {
Name string
Usage string
Value *big.Int
}
func (b *BigIntFlag) String() string {
if b.Value == nil {
return ""
}
return b.Value.String()
}
func (b *BigIntFlag) Set(value string) error {
num := new(big.Int)
var ok bool
if strings.HasPrefix(value, "0x") {
num, ok = num.SetString(value[2:], 16)
} else {
num, ok = num.SetString(value, 10)
}
if !ok {
return fmt.Errorf("failed to set big int")
}
b.Value = num
return nil
}
func (f *Flagset) BigIntFlag(b *BigIntFlag) {
f.addFlag(&FlagVar{
Name: b.Name,
Usage: b.Usage,
})
f.set.Var(b, b.Name, b.Usage)
}
type SliceStringFlag struct {
Name string
Usage string
Value *[]string
}
func (i *SliceStringFlag) String() string {
if i.Value == nil {
return ""
}
return strings.Join(*i.Value, ",")
}
func (i *SliceStringFlag) Set(value string) error {
*i.Value = append(*i.Value, strings.Split(value, ",")...)
return nil
}
func (f *Flagset) SliceStringFlag(s *SliceStringFlag) {
f.addFlag(&FlagVar{
Name: s.Name,
Usage: s.Usage,
})
f.set.Var(s, s.Name, s.Usage)
}
type DurationFlag struct {
Name string
Usage string
Value *time.Duration
Default time.Duration
}
func (f *Flagset) DurationFlag(d *DurationFlag) {
f.addFlag(&FlagVar{
Name: d.Name,
Usage: d.Usage,
})
f.set.DurationVar(d.Value, d.Name, d.Default, "")
}
type MapStringFlag struct {
Name string
Usage string
Value *map[string]string
}
func (m *MapStringFlag) String() string {
if m.Value == nil {
return ""
}
ls := []string{}
for k, v := range *m.Value {
ls = append(ls, k+"="+v)
}
return strings.Join(ls, ",")
}
func (m *MapStringFlag) Set(value string) error {
if m.Value == nil {
m.Value = &map[string]string{}
}
for _, t := range strings.Split(value, ",") {
if t != "" {
kv := strings.Split(t, "=")
if len(kv) == 2 {
(*m.Value)[kv[0]] = kv[1]
}
}
}
return nil
}
func (f *Flagset) MapStringFlag(m *MapStringFlag) {
f.addFlag(&FlagVar{
Name: m.Name,
Usage: m.Usage,
})
f.set.Var(m, m.Name, m.Usage)
}
type Float64Flag struct {
Name string
Usage string
Value *float64
Default float64
}
func (f *Flagset) Float64Flag(i *Float64Flag) {
f.addFlag(&FlagVar{
Name: i.Name,
Usage: i.Usage,
})
f.set.Float64Var(i.Value, i.Name, i.Default, "")
}