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/telegram/message/internal/mkentity/main.go

@@ -0,0 +1,103 @@
+package main
+
+import (
+	"flag"
+	"reflect"
+
+	"github.com/go-faster/errors"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tdp"
+	"go.mau.fi/mautrix-telegram/pkg/gotd/telegram/message/internal/mkrun"
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tg"
+)
+
+// Field represents type field.
+type Field struct {
+	// Name is Go name of field.
+	Name string
+	// Type is Go type of field.
+	Type string
+}
+
+// Type represents generated type.
+type Type struct {
+	// Name is Go name of type.
+	Name string
+	// Fields is slice of type fields.
+	Fields []Field
+	// SchemaType is related schema type.
+	SchemaType tdp.Type
+}
+
+var (
+	constructors = tg.ClassConstructorsMap()
+	create       = tg.TypesConstructorMap()
+	templates    = map[string]string{
+		"entity":  entityTmpl,
+		"styling": stylingTmpl,
+	}
+)
+
+type generator struct {
+	template string
+}
+
+func (g *generator) Name() string {
+	return "mkentity"
+}
+
+func (g *generator) Flags(set *flag.FlagSet) {
+	set.StringVar(&g.template, "template", "entity", "template to use")
+}
+
+func (g *generator) Template() string {
+	return templates[g.template]
+}
+
+func (g *generator) Data() (interface{}, error) {
+	var types []Type
+	for _, typeID := range constructors[tg.MessageEntityClassName] {
+		v, ok := create[typeID]().(tdp.Object)
+		if !ok {
+			return nil, errors.Errorf("bad type %#x", typeID)
+		}
+		schemaType := v.TypeInfo()
+		// Skip messageEntityMentionName because we should use inputMessageEntityMentionName.
+		if schemaType.Name == "messageEntityMentionName" {
+			continue
+		}
+
+		tv := reflect.TypeOf(v).Elem()
+
+		var fields []Field
+		for _, field := range schemaType.Fields {
+			// These fields set by Formatter callee.
+			if field.Name == "Offset" || field.Name == "Length" {
+				continue
+			}
+
+			rf, ok := tv.FieldByName(field.Name)
+			if !ok {
+				return nil, errors.Errorf(
+					"field of %q type %q not found",
+					field.Name, schemaType.Name,
+				)
+			}
+			fields = append(fields, Field{
+				Name: field.Name,
+				Type: rf.Type.String(),
+			})
+		}
+		types = append(types, Type{
+			Name:       tv.Name(),
+			Fields:     fields,
+			SchemaType: v.TypeInfo(),
+		})
+	}
+
+	return types, nil
+}
+
+func main() {
+	mkrun.Main(&generator{})
+}