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https://github.com/Luzifer/rconfig.git
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Add support for time.Time flags
Signed-off-by: Knut Ahlers <knut@ahlers.me>
This commit is contained in:
parent
913d4f1e88
commit
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GPG Key ID:
DC2729FDD34BE99E
110
config.go
110
config.go
@ -16,10 +16,25 @@ import (
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validator "gopkg.in/validator.v2"
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)
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type afterFunc func() error
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var (
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autoEnv bool
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fs *pflag.FlagSet
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variableDefaults map[string]string
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timeParserFormats = []string{
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// Default constants
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time.RFC3339Nano, time.RFC3339,
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time.RFC1123Z, time.RFC1123,
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time.RFC822Z, time.RFC822,
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time.RFC850, time.RubyDate, time.UnixDate, time.ANSIC,
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"2006-01-02 15:04:05.999999999 -0700 MST",
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// More uncommon time formats
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"2006-01-02 15:04:05", "2006-01-02 15:04:05Z07:00", // Simplified ISO time format
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"01/02/2006 15:04:05", "01/02/2006 15:04:05Z07:00", // US time format
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"02.01.2006 15:04:05", "02.01.2006 15:04:05Z07:00", // DE time format
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}
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)
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func init() {
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@ -61,6 +76,11 @@ func Args() []string {
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return fs.Args()
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}
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// AddTimeParserFormats adds custom formats to parse time.Time fields
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func AddTimeParserFormats(f ...string) {
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timeParserFormats = append(timeParserFormats, f...)
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}
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// AutoEnv enables or disables automated env variable guessing. If no `env` struct
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// tag was set and AutoEnv is enabled the env variable name is derived from the
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// name of the field: `MyFieldName` will get `MY_FIELD_NAME`
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@ -97,22 +117,37 @@ func parse(in interface{}, args []string) error {
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}
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fs = pflag.NewFlagSet(os.Args[0], pflag.ExitOnError)
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if err := execTags(in, fs); err != nil {
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afterFuncs, err := execTags(in, fs)
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if err != nil {
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return err
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}
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return fs.Parse(args)
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if err := fs.Parse(args); err != nil {
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return err
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}
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if afterFuncs != nil {
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for _, f := range afterFuncs {
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if err := f(); err != nil {
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return err
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}
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}
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}
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return nil
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}
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func execTags(in interface{}, fs *pflag.FlagSet) error {
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func execTags(in interface{}, fs *pflag.FlagSet) ([]afterFunc, error) {
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if reflect.TypeOf(in).Kind() != reflect.Ptr {
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return errors.New("Calling parser with non-pointer")
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return nil, errors.New("Calling parser with non-pointer")
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}
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if reflect.ValueOf(in).Elem().Kind() != reflect.Struct {
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return errors.New("Calling parser with pointer to non-struct")
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return nil, errors.New("Calling parser with pointer to non-struct")
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}
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afterFuncs := []afterFunc{}
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st := reflect.ValueOf(in).Elem()
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for i := 0; i < st.NumField(); i++ {
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valField := st.Field(i)
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@ -134,7 +169,7 @@ func execTags(in interface{}, fs *pflag.FlagSet) error {
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if value == "" {
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v = time.Duration(0)
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} else {
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return err
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return nil, err
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}
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}
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@ -148,6 +183,53 @@ func execTags(in interface{}, fs *pflag.FlagSet) error {
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valField.Set(reflect.ValueOf(v))
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}
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continue
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case reflect.TypeOf(time.Time{}):
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var sVar string
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if typeField.Tag.Get("flag") != "" {
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if len(parts) == 1 {
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fs.StringVar(&sVar, parts[0], value, typeField.Tag.Get("description"))
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} else {
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fs.StringVarP(&sVar, parts[0], parts[1], value, typeField.Tag.Get("description"))
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}
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} else {
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sVar = value
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}
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afterFuncs = append(afterFuncs, func(valField reflect.Value, sVar *string) func() error {
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return func() error {
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if *sVar == "" {
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// No time, no problem
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return nil
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}
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// Check whether we could have a timestamp
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if ts, err := strconv.ParseInt(*sVar, 10, 64); err == nil {
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t := time.Unix(ts, 0)
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valField.Set(reflect.ValueOf(t))
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return nil
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}
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// We haven't so lets walk through possible time formats
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matched := false
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for _, tf := range timeParserFormats {
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if t, err := time.Parse(tf, *sVar); err == nil {
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matched = true
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valField.Set(reflect.ValueOf(t))
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return nil
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}
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}
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if !matched {
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return fmt.Errorf("Value %q did not match expected time formats", *sVar)
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}
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return nil
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}
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}(valField, &sVar))
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continue
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}
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switch typeField.Type.Kind() {
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@ -180,7 +262,7 @@ func execTags(in interface{}, fs *pflag.FlagSet) error {
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if value == "" {
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vt = 0
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} else {
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return err
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return nil, err
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}
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}
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if typeField.Tag.Get("flag") != "" {
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@ -195,7 +277,7 @@ func execTags(in interface{}, fs *pflag.FlagSet) error {
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if value == "" {
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vt = 0
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} else {
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return err
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return nil, err
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}
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}
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if typeField.Tag.Get("flag") != "" {
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@ -210,7 +292,7 @@ func execTags(in interface{}, fs *pflag.FlagSet) error {
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if value == "" {
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vt = 0.0
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} else {
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return err
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return nil, err
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}
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}
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if typeField.Tag.Get("flag") != "" {
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@ -220,9 +302,11 @@ func execTags(in interface{}, fs *pflag.FlagSet) error {
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}
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case reflect.Struct:
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if err := execTags(valField.Addr().Interface(), fs); err != nil {
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return err
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afs, err := execTags(valField.Addr().Interface(), fs)
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if err != nil {
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return nil, err
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}
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afterFuncs = append(afterFuncs, afs...)
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case reflect.Slice:
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switch typeField.Type.Elem().Kind() {
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@ -231,7 +315,7 @@ func execTags(in interface{}, fs *pflag.FlagSet) error {
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for _, v := range strings.Split(value, ",") {
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it, err := strconv.ParseInt(strings.TrimSpace(v), 10, 64)
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if err != nil {
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return err
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return nil, err
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}
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def = append(def, int(it))
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}
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@ -258,7 +342,7 @@ func execTags(in interface{}, fs *pflag.FlagSet) error {
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}
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}
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return nil
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return afterFuncs, nil
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}
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func registerFlagFloat(t reflect.Kind, fs *pflag.FlagSet, field interface{}, parts []string, vt float64, desc string) {
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51
time_test.go
Normal file
51
time_test.go
Normal file
@ -0,0 +1,51 @@
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package rconfig
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import (
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"fmt"
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"testing"
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"time"
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)
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func TestParseTime(t *testing.T) {
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type ts struct {
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Test time.Time `flag:"time"`
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TestS time.Time `flag:"other-time,o"`
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TestDef time.Time `default:"2006-01-02T15:04:05.999999999Z"`
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TestDE time.Time `default:"18.09.2018 20:25:31"`
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}
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var (
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err error
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args []string
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cfg ts
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)
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for _, tf := range timeParserFormats {
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expect := time.Now().Format(tf)
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cfg = ts{}
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args = []string{
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fmt.Sprintf("--time=%s", expect),
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"-o", expect,
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}
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if err = parse(&cfg, args); err != nil {
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t.Fatalf("Time format %q did not parse: %s", tf, err)
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}
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for name, ti := range map[string]time.Time{
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"Long flag": cfg.Test,
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"Short flag": cfg.TestS,
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"Default flag": cfg.TestDef,
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"DE flag": cfg.TestDE,
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} {
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if ti.IsZero() {
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t.Errorf("%s did parse to zero with format %q", name, tf)
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}
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}
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if e := cfg.Test.Format(tf); e != expect {
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t.Errorf("Parsed time %q did not match expectation %q", e, expect)
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}
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}
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}
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