Bulk command overwrite (#926)

* add session.ApplicationCommandBulkOverwrite

* change ApplicationCommandBulkOverwrite to take a guildID

* formatting

* add omitempty to ID of ApplicationCommand

interactions.go

@@ -15,7 +15,7 @@ const InteractionDeadline = time.Second * 3
 
 // ApplicationCommand represents an application's slash command.
 type ApplicationCommand struct {
-	ID            string                      `json:"id"`
+	ID            string                      `json:"id,omitempty"`
 	ApplicationID string                      `json:"application_id,omitempty"`
 	Name          string                      `json:"name"`
 	Description   string                      `json:"description,omitempty"`

restapi.go

@@ -2472,6 +2472,25 @@ func (s *Session) ApplicationCommandEdit(appID, guildID, cmdID string, cmd *Appl
 	return
 }
 
+// ApplicationCommandBulkOverwrite Creates commands overwriting existing commands. Returns a list of commands.
+// appID    : The application ID.
+// commands : The commands to create.
+func (s *Session) ApplicationCommandBulkOverwrite(appID string, guildID string, commands []*ApplicationCommand) (createdCommands []*ApplicationCommand, err error) {
+	endpoint := EndpointApplicationGlobalCommands(appID)
+	if guildID != "" {
+		endpoint = EndpointApplicationGuildCommands(appID, guildID)
+	}
+
+	body, err := s.RequestWithBucketID("PUT", endpoint, commands, endpoint)
+	if err != nil {
+		return
+	}
+
+	err = unmarshal(body, &createdCommands)
+
+	return
+}
+
 // ApplicationCommandDelete deletes application command by ID.
 // appID       : The application ID.
 // cmdID       : Application command ID to delete.