Fix setting guild role positions (#751)

src/client/actions/ActionsManager.js

@@ -23,6 +23,7 @@ class ActionsManager {
     this.register('GuildEmojiCreate');
     this.register('GuildEmojiDelete');
     this.register('GuildEmojiUpdate');
+    this.register('GuildRolesPositionUpdate');
   }
 
   register(name) {

src/client/actions/GuildRolesPositionUpdate.js

@@ -0,0 +1,30 @@
+const Action = require('./Action');
+
+class GuildRolesPositionUpdate extends Action {
+  handle(data) {
+    const client = this.client;
+
+    const guild = client.guilds.get(data.guild_id);
+    if (guild) {
+      for (const partialRole of data.roles) {
+        const role = guild.roles.get(partialRole.id);
+        if (role) {
+          role.position = partialRole.position;
+        }
+      }
+    }
+
+    return {
+      guild,
+    };
+  }
+}
+
+/**
+ * Emitted whenever a guild role is created.
+ * @event Client#guildRoleCreate
+ * @param {Guild} guild The guild that the role was created in.
+ * @param {Role} role The role that was created.
+ */
+
+module.exports = GuildRolesPositionUpdate;

src/client/rest/RESTMethods.js

@@ -677,6 +677,19 @@ class RESTMethods {
       }).catch(reject);
     });
   }
+
+  setRolePositions(guildID, roles) {
+    return new Promise((resolve, reject) => {
+      this.rest.makeRequest('patch', Constants.Endpoints.guildRoles(guildID), true, roles)
+        .then(() => {
+          resolve(this.rest.client.actions.GuildRolesPositionUpdate.handle({
+            guild_id: guildID,
+            roles,
+          }).guild);
+        })
+        .catch(reject);
+    });
+  }
 }
 
 module.exports = RESTMethods;