⬆️ update dependencies, ✨ implement user store

vendor/github.com/alecthomas/kong/resolver.go

@@ -0,0 +1,49 @@
+package kong
+
+import (
+	"encoding/json"
+	"io"
+	"strings"
+)
+
+// A Resolver resolves a Flag value from an external source.
+type Resolver interface {
+	// Validate configuration against Application.
+	//
+	// This can be used to validate that all provided configuration is valid within  this application.
+	Validate(app *Application) error
+
+	// Resolve the value for a Flag.
+	Resolve(context *Context, parent *Path, flag *Flag) (interface{}, error)
+}
+
+// ResolverFunc is a convenience type for non-validating Resolvers.
+type ResolverFunc func(context *Context, parent *Path, flag *Flag) (interface{}, error)
+
+var _ Resolver = ResolverFunc(nil)
+
+func (r ResolverFunc) Resolve(context *Context, parent *Path, flag *Flag) (interface{}, error) { // nolint: golint
+	return r(context, parent, flag)
+}
+func (r ResolverFunc) Validate(app *Application) error { return nil } //  nolint: golint
+
+// JSON returns a Resolver that retrieves values from a JSON source.
+//
+// Hyphens in flag names are replaced with underscores.
+func JSON(r io.Reader) (Resolver, error) {
+	values := map[string]interface{}{}
+	err := json.NewDecoder(r).Decode(&values)
+	if err != nil {
+		return nil, err
+	}
+	var f ResolverFunc = func(context *Context, parent *Path, flag *Flag) (interface{}, error) {
+		name := strings.Replace(flag.Name, "-", "_", -1)
+		raw, ok := values[name]
+		if !ok {
+			return nil, nil
+		}
+		return raw, nil
+	}
+
+	return f, nil
+}