move gotd fork into repo. (#111)

- update to latest telegram layer
- remove some references to fields in tg.Entities that don't exist in
the schema
- originally added here:
https://github.com/beeper/td/commit/820929062a2ba0104397bc01235ab58a9cff780e
  - referenced here
-
https://github.com/mautrix/telegramgo/commit/124f0967ed195b5a380c9bd02e170ada9710dde3
-
https://github.com/mautrix/telegramgo/commit/4205047aab2e0639217148b5d125bfaab668bd8e

pkg/gotd/gen/config.go

@@ -0,0 +1,70 @@
+package gen
+
+import "flag"
+
+// GenerateFlags is flags for optional generation.
+type GenerateFlags struct {
+	// Client enables client generation.
+	Client bool
+	// Registry enables type ID registry generation.
+	Registry bool
+	// Server enables experimental server generation.
+	Server bool
+	// Handlers enables update handler generation.
+	Handlers bool
+	// UpdatesClassifier enables updates classifier generation.
+	UpdatesClassifier bool
+	// GetSet enables getters and setters generation.
+	GetSet bool
+	// Mapping enables mapping helpers generation.
+	Mapping bool
+	// Slices enables slice helpers generation.
+	Slices bool
+	// TDLibJSON enables TDLib API JSON encoders and decoders generation.
+	TDLibJSON bool
+}
+
+// RegisterFlags registers GenerateFlags fields in given flag set.
+func (s *GenerateFlags) RegisterFlags(set *flag.FlagSet) {
+	set.BoolVar(&s.Client, "client", true, "Enables client generation")
+	set.BoolVar(&s.Registry, "registry", true, "Enables type ID registry generation")
+	set.BoolVar(&s.Server, "server", false, "Enables experimental server generation")
+	set.BoolVar(&s.Handlers, "handlers", false, "Enables update handler generation")
+	set.BoolVar(&s.UpdatesClassifier, "updates-classifier", true, "Enables updates classifier generation")
+	set.BoolVar(&s.GetSet, "getset", true, "Enables getters and setters generation")
+	set.BoolVar(&s.Mapping, "mapping", false, "Enables mapping helpers generation")
+	set.BoolVar(&s.Slices, "slices", false, "Enables slice helpers generation")
+	set.BoolVar(&s.TDLibJSON, "tdlib-json", false, "Enables TDLib JSON encoding generation")
+}
+
+// GeneratorOptions is a Generator options structure.
+type GeneratorOptions struct {
+	// DocBaseURL is a documentation base URL.
+	// If DocBaseURL is set, Generator will embed documentation references to generated code.
+	//
+	// If base is https://core.telegram.org, documentation content will be also
+	// embedded.
+	DocBaseURL string
+	// DocLineLimit sets GoDoc comment line length limit.
+	DocLineLimit int
+	GenerateFlags
+}
+
+// RegisterFlags registers GeneratorOptions fields in given flag set.
+func (s *GeneratorOptions) RegisterFlags(set *flag.FlagSet) {
+	set.StringVar(&s.DocBaseURL, "doc", "", "Base documentation url")
+	set.IntVar(&s.DocLineLimit, "line-limit", 0, "GoDoc comment line length limit")
+	s.GenerateFlags.RegisterFlags(set)
+}
+
+func (s *GeneratorOptions) setDefaults() {
+	// Zero value DocBaseURL handled by NewGenerator.
+	// It's okay to use zero value GenerateClient.
+	// It's okay to use zero value GenerateRegistry.
+	// It's okay to use zero value GenerateServer.
+	// It's okay to use zero value GenerateHelpers.
+	// It's okay to use zero value GenerateSlices.
+	if s.DocLineLimit == 0 {
+		s.DocLineLimit = 87
+	}
+}