From 9cf18cf5befa68a9319831e2473cb996e2059268 Mon Sep 17 00:00:00 2001
From: Wenpiner <127460925+Wenpiner@users.noreply.github.com>
Date: Mon, 1 Apr 2024 12:11:22 +0000
Subject: [PATCH 1/4] feat: Added custom Tag Option

Custom Tag function The default json is effective in proto [#129](https://github.com/jinzhu/copier/issues/129#issuecomment-1643201774), providing a more flexible tagging method. This feature has been thoroughly tested and proven in local environments.
---
 copier.go | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/copier.go b/copier.go
index 0cc6465..a894659 100644
--- a/copier.go
+++ b/copier.go
@@ -44,6 +44,8 @@ type Option struct {
 	// Custom field name mappings to copy values with different names in `fromValue` and `toValue` types.
 	// Examples can be found in `copier_field_name_mapping_test.go`.
 	FieldNameMapping []FieldNameMapping
+	// Tag
+	Tag 		  string
 }
 
 func (opt Option) converters() map[converterPair]TypeConverter {
@@ -304,9 +306,11 @@ func copier(toValue interface{}, fromValue interface{}, opt Option) (err error)
 			initDest = true
 			dest = indirect(reflect.New(toType))
 		}
-
+		if opt.Tag == "" {
+			opt.Tag = "copier"
+		}
 		// Get tag options
-		flgs, err := getFlags(dest, source, toType, fromType)
+		flgs, err := getFlags(dest, source, toType, fromType, opt.Tag)
 		if err != nil {
 			return err
 		}
@@ -705,7 +709,7 @@ func parseTags(tag string) (flg uint8, name string, err error) {
 }
 
 // getTagFlags Parses struct tags for bit flags, field name.
-func getFlags(dest, src reflect.Value, toType, fromType reflect.Type) (flags, error) {
+func getFlags(dest, src reflect.Value, toType, fromType reflect.Type, tag string) (flags, error) {
 	flgs := flags{
 		BitFlags: map[string]uint8{},
 		SrcNames: tagNameMapping{
@@ -727,7 +731,7 @@ func getFlags(dest, src reflect.Value, toType, fromType reflect.Type) (flags, er
 
 	// Get a list dest of tags
 	for _, field := range toTypeFields {
-		tags := field.Tag.Get("copier")
+		tags := field.Tag.Get(tag)
 		if tags != "" {
 			var name string
 			var err error
@@ -742,7 +746,7 @@ func getFlags(dest, src reflect.Value, toType, fromType reflect.Type) (flags, er
 
 	// Get a list source of tags
 	for _, field := range fromTypeFields {
-		tags := field.Tag.Get("copier")
+		tags := field.Tag.Get(tag)
 		if tags != "" {
 			var name string
 			var err error

From f624d860b40bdb9fd79826695783fd4f1f270285 Mon Sep 17 00:00:00 2001
From: Wenpiner <127460925+Wenpiner@users.noreply.github.com>
Date: Mon, 1 Apr 2024 14:20:43 +0000
Subject: [PATCH 2/4] fix: tag upper

---
 copier.go | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/copier.go b/copier.go
index a894659..695e44f 100644
--- a/copier.go
+++ b/copier.go
@@ -698,11 +698,12 @@ func parseTags(tag string) (flg uint8, name string, err error) {
 		case "nopanic":
 			flg = flg | tagNoPanic
 		default:
-			if unicode.IsUpper([]rune(t)[0]) {
-				name = strings.TrimSpace(t)
-			} else {
-				err = ErrFieldNameTagStartNotUpperCase
-			}
+			name = strings.TrimSpace(t)
+			// if unicode.IsUpper([]rune(t)[0]) {
+			// 	name = strings.TrimSpace(t)
+			// } else {
+			// 	err = ErrFieldNameTagStartNotUpperCase
+			// }
 		}
 	}
 	return

From 6394108e6623a5cd2046f5a50a16119427510faf Mon Sep 17 00:00:00 2001
From: Wenpiner <127460925+Wenpiner@users.noreply.github.com>
Date: Mon, 1 Apr 2024 14:27:27 +0000
Subject: [PATCH 3/4] fix: u

---
 copier.go | 1 -
 1 file changed, 1 deletion(-)

diff --git a/copier.go b/copier.go
index 695e44f..3da1f9f 100644
--- a/copier.go
+++ b/copier.go
@@ -7,7 +7,6 @@ import (
 	"reflect"
 	"strings"
 	"sync"
-	"unicode"
 )
 
 // These flags define options for tag handling

From b1dd1c30a7e73749ac22f20141905c8f1ca90881 Mon Sep 17 00:00:00 2001
From: Wenpiner <127460925+Wenpiner@users.noreply.github.com>
Date: Mon, 1 Apr 2024 15:41:45 +0000
Subject: [PATCH 4/4] fix: parseTags

---
 copier.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/copier.go b/copier.go
index 3da1f9f..7377589 100644
--- a/copier.go
+++ b/copier.go
@@ -704,6 +704,7 @@ func parseTags(tag string) (flg uint8, name string, err error) {
 			// 	err = ErrFieldNameTagStartNotUpperCase
 			// }
 		}
+		return
 	}
 	return
 }