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flag.go
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flag.go
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package eflag
import (
"flag"
"fmt"
"os"
"strconv"
"strings"
"testing"
)
var (
flagset *FlagSet
)
func init() {
flagset = &FlagSet{
FlagSet: flag.CommandLine,
flags: defaultFlags,
actions: make(map[string]func(string, *FlagSet)),
}
testing.Init()
}
// Flag ...
type (
// Flag defines application flag.
Flag interface {
Apply(*FlagSet)
}
// FlagSet wraps a set of Flags.
FlagSet struct {
*flag.FlagSet
flags []Flag
actions map[string]func(string, *FlagSet)
}
)
// setFlagSet 设置flagSet
func setFlagSet(fs *FlagSet) {
flagset = fs
}
// Register ...
func Register(fs ...Flag) {
flagset.Register(fs...)
}
// Register ...
func (fs *FlagSet) Register(flags ...Flag) {
fs.flags = append(fs.flags, flags...)
}
// With adds flags to the flagset.
func With(fs ...Flag) { flagset.With(fs...) }
// With adds flags to provided flagset.
func (fs *FlagSet) With(flags ...Flag) {
fs.flags = append(fs.flags, flags...)
}
// Parse parses the flagset.
func Parse() error {
return flagset.Parse()
}
// Lookup lookup flag value by name
// priority: flag > env > default
func (fs *FlagSet) Lookup(name string) *flag.Flag {
return fs.FlagSet.Lookup(name)
}
// Parse parses provided flagset.
func (fs *FlagSet) Parse() error {
if fs.Parsed() {
return nil
}
for _, f := range fs.flags {
f.Apply(fs)
}
// 解析命令行参数
if err := fs.FlagSet.Parse(os.Args[1:]); err != nil {
return err
}
// 遍历所欲flagset数据
fs.FlagSet.Visit(func(f *flag.Flag) {
if action, ok := fs.actions[f.Name]; ok && action != nil {
action(f.Name, fs)
}
})
return nil
}
// BoolE parses bool flag of the flagset with error returned.
func BoolE(name string) (bool, error) { return flagset.BoolE(name) }
// BoolE parses bool flag of provided flagset with error returned.
func (fs *FlagSet) BoolE(name string) (bool, error) {
flag := fs.Lookup(name)
if flag != nil {
return strconv.ParseBool(flag.Value.String())
}
return false, fmt.Errorf("undefined flag name: %s", name)
}
// Bool parses bool flag of the flagset.
func Bool(name string) bool { return flagset.Bool(name) }
// Bool parses bool flag of provided flagset.
func (fs *FlagSet) Bool(name string) bool {
ret, _ := fs.BoolE(name)
return ret
}
// StringE parses string flag of the flagset with error returned.
func StringE(name string) (string, error) { return flagset.StringE(name) }
// StringE parses string flag of provided flagset with error returned.
func (fs *FlagSet) StringE(name string) (string, error) {
flag := fs.Lookup(name)
if flag != nil {
return flag.Value.String(), nil
}
return "", fmt.Errorf("undefined flag name: %s", name)
}
// String parses string flag of the flagset.
func String(name string) string { return flagset.String(name) }
// String parses string flag of provided flagset.
func (fs *FlagSet) String(name string) string {
ret, _ := fs.StringE(name)
return ret
}
// IntE parses int flag of the flagset with error returned.
func IntE(name string) (int64, error) { return flagset.IntE(name) }
// IntE parses int flag of provided flagset with error returned.
func (fs *FlagSet) IntE(name string) (int64, error) {
flag := fs.Lookup(name)
if flag != nil {
return strconv.ParseInt(flag.Value.String(), 10, 64)
}
return 0, fmt.Errorf("undefined flag name: %s", name)
}
// Int parses int flag of the flagset.
func Int(name string) int64 { return flagset.Int(name) }
// Int parses int flag of provided flagset.
func (fs *FlagSet) Int(name string) int64 {
ret, _ := fs.IntE(name)
return ret
}
// UintE parses int flag of the flagset with error returned.
func UintE(name string) (uint64, error) { return flagset.UintE(name) }
// UintE parses int flag of provided flagset with error returned.
func (fs *FlagSet) UintE(name string) (uint64, error) {
flag := fs.Lookup(name)
if flag != nil {
return strconv.ParseUint(flag.Value.String(), 10, 64)
}
return 0, fmt.Errorf("undefined flag name: %s", name)
}
// Uint parses int flag of the flagset.
func Uint(name string) uint64 { return flagset.Uint(name) }
// Uint parses int flag of provided flagset.
func (fs *FlagSet) Uint(name string) uint64 {
ret, _ := fs.UintE(name)
return ret
}
// Float64E parses int flag of the flagset with error returned.
func Float64E(name string) (float64, error) { return flagset.Float64E(name) }
// Float64E parses int flag of provided flagset with error returned.
func (fs *FlagSet) Float64E(name string) (float64, error) {
flag := fs.Lookup(name)
if flag != nil {
return strconv.ParseFloat(flag.Value.String(), 64)
}
return 0.0, fmt.Errorf("undefined flag name: %s", name)
}
// Float64 parses int flag of the flagset.
func Float64(name string) float64 { return flagset.Float64(name) }
// Float64 parses int flag of provided flagset.
func (fs *FlagSet) Float64(name string) float64 {
ret, _ := fs.Float64E(name)
return ret
}
// UintFlag is an uint flag implements of Flag interface.
type UintFlag struct {
Name string
Usage string
Default uint
Variable *uint
Action func(string, *FlagSet)
}
// Apply implements of Flag Apply function.
func (f *UintFlag) Apply(set *FlagSet) {
for _, field := range strings.Split(f.Name, ",") {
field = strings.TrimSpace(field)
if f.Variable != nil {
set.FlagSet.UintVar(f.Variable, field, f.Default, f.Usage)
}
set.FlagSet.Uint(field, f.Default, f.Usage)
set.actions[field] = f.Action
}
}
// Float64Flag is a float flag implements of Flag interface.
type Float64Flag struct {
Name string
Usage string
Default float64
Variable *float64
Action func(string, *FlagSet)
}
// Apply implements of Flag Apply function.
func (f *Float64Flag) Apply(set *FlagSet) {
for _, field := range strings.Split(f.Name, ",") {
field = strings.TrimSpace(field)
if f.Variable != nil {
set.FlagSet.Float64Var(f.Variable, field, f.Default, f.Usage)
}
set.FlagSet.Float64(field, f.Default, f.Usage)
set.actions[field] = f.Action
}
}