Add Reaction() to emojis (#266)

discord/emoji.go

@@ -1,6 +1,7 @@
 package discord
 
 import (
+	"fmt"
 	"time"
 
 	"github.com/disgoorg/snowflake/v2"
@@ -21,6 +22,14 @@ type Emoji struct {
 	Available     bool           `json:"available,omitempty"`
 }
 
+// Reaction returns a string used for manipulating with reactions. May be empty if the Name is empty
+func (e Emoji) Reaction() string {
+	if e.Name == "" {
+		return ""
+	}
+	return reaction(e.Name, e.ID)
+}
+
 // Mention returns the string used to send the Emoji
 func (e Emoji) Mention() string {
 	if e.Animated {
@@ -61,3 +70,18 @@ type PartialEmoji struct {
 	Name     *string       `json:"name"`
 	Animated bool          `json:"animated"`
 }
+
+// Reaction returns a string used for manipulating with reactions. May be empty if the Name is nil
+func (e PartialEmoji) Reaction() string {
+	if e.Name == nil {
+		return ""
+	}
+	if e.ID == nil {
+		return *e.Name
+	}
+	return reaction(*e.Name, *e.ID)
+}
+
+func reaction(name string, id snowflake.ID) string {
+	return fmt.Sprintf("%s:%s", name, id)
+}