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// Package flag implements encoding and decoding between flag arguments and a typed Configuration.
package flag
import (
"github.com/traefik/paerser/parser"
)
// Decode decodes the given flag arguments into the given element.
// The operation goes through four stages roughly summarized as:
// - flag arguments -> parsed map of flags
// - map -> tree of untyped nodes
// - untyped nodes -> nodes augmented with metadata such as kind (inferred from element)
// - "typed" nodes -> typed element.
func Decode(args []string, element interface{}) error {
ref, err := Parse(args, element)
if err != nil {
return err
}
return parser.Decode(ref, element, parser.DefaultRootName)
}
// Encode encodes the configuration in element into the flags represented in the returned Flats.
// The operation goes through three stages roughly summarized as:
// - typed configuration in element -> tree of untyped nodes
// - untyped nodes -> nodes augmented with metadata such as kind (inferred from element)
// - "typed" nodes -> flags with default values (determined by type/kind).
func Encode(element interface{}) ([]parser.Flat, error) {
if element == nil {
return nil, nil
}
etnOpts := parser.EncoderToNodeOpts{OmitEmpty: false, TagName: parser.TagLabel, AllowSliceAsStruct: true}
node, err := parser.EncodeToNode(element, parser.DefaultRootName, etnOpts)
if err != nil {
return nil, err
}
metaOpts := parser.MetadataOpts{TagName: parser.TagLabel, AllowSliceAsStruct: true}
err = parser.AddMetadata(element, node, metaOpts)
if err != nil {
return nil, err
}
flatOpts := parser.FlatOpts{Separator: ".", SkipRoot: true, TagName: parser.TagLabel}
return parser.EncodeToFlat(element, node, flatOpts)
}
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