add multi-file support (#1268)

* add multi-file support

* (╯°□°）╯︵ ┻━┻

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* stupid git web rebase editor - Gus2k17

* Update TextBasedChannel.js

* Update TextBasedChannel.js

src/client/rest/APIRequest.js

@@ -2,13 +2,13 @@ const request = require('superagent');
 const Constants = require('../../util/Constants');
 
 class APIRequest {
-  constructor(rest, method, url, auth, data, file) {
+  constructor(rest, method, url, auth, data, files) {
     this.rest = rest;
     this.method = method;
     this.url = url;
     this.auth = auth;
     this.data = data;
-    this.file = file;
+    this.files = files;
     this.route = this.getRoute(this.url);
   }
 
@@ -34,8 +34,8 @@ class APIRequest {
   gen() {
     const apiRequest = request[this.method](this.url);
     if (this.auth) apiRequest.set('authorization', this.getAuth());
-    if (this.file && this.file.file) {
+    if (this.files) {
-      apiRequest.attach('file', this.file.file, this.file.name);
+      for (const file of this.files) if (file && file.file) apiRequest.attach(file.name, file.file, file.name);
       this.data = this.data || {};
       apiRequest.field('payload_json', JSON.stringify(this.data));
     } else if (this.data) {

src/client/rest/RESTMethods.js

@@ -57,7 +57,7 @@ class RESTMethods {
     });
   }
 
-  sendMessage(channel, content, { tts, nonce, embed, disableEveryone, split, code, reply } = {}, file = null) {
+  sendMessage(channel, content, { tts, nonce, embed, disableEveryone, split, code, reply } = {}, files = null) {
     return new Promise((resolve, reject) => { // eslint-disable-line complexity
       if (typeof content !== 'undefined') content = this.client.resolver.resolveString(content);
 
@@ -99,7 +99,7 @@ class RESTMethods {
           const messages = [];
           (function sendChunk(list, index) {
             const options = index === list.length ? { tts, embed } : { tts };
-            chan.send(list[index], options, index === list.length ? file : null).then(message => {
+            chan.send(list[index], options, index === list.length ? files : null).then(message => {
               messages.push(message);
               if (index >= list.length - 1) return resolve(messages);
               return sendChunk(list, ++index);
@@ -108,7 +108,7 @@ class RESTMethods {
         } else {
           this.rest.makeRequest('post', Constants.Endpoints.channelMessages(chan.id), true, {
             content, tts, nonce, embed,
-          }, file).then(data => resolve(this.client.actions.MessageCreate.handle(data).message), reject);
+          }, files).then(data => resolve(this.client.actions.MessageCreate.handle(data).message), reject);
         }
       };
 

src/structures/interface/TextBasedChannel.js

@@ -37,7 +37,8 @@ class TextBasedChannel {
    * (see [here](https://discordapp.com/developers/docs/resources/channel#embed-object) for more details)
    * @property {boolean} [disableEveryone=this.client.options.disableEveryone] Whether or not @everyone and @here
    * should be replaced with plain-text
-   * @property {FileOptions|string} [file] A file to send with the message
+   * @property {FileOptions|string} [file] A file to send with the message **(deprecated)**
+   * @property {FileOptions[]|string[]} [files] Files to send with the message
    * @property {string|boolean} [code] Language for optional codeblock formatting to apply
    * @property {boolean|SplitOptions} [split=false] Whether or not the message should be split into multiple messages if
    * it exceeds the character limit. If an object is provided, these are the options for splitting the message.
@@ -78,26 +79,34 @@ class TextBasedChannel {
       options = {};
     }
 
-    if (options.embed && options.embed.file) options.file = options.embed.file;
+    // backward compat
-
     if (options.file) {
-      if (typeof options.file === 'string') options.file = { attachment: options.file };
+      if (options.files) options.files.push(options.file);
-      if (!options.file.name) {
+      else options.files = [options.file];
-        if (typeof options.file.attachment === 'string') {
+    }
-          options.file.name = path.basename(options.file.attachment);
+
-        } else if (options.file.attachment && options.file.attachment.path) {
+    if (options.files) {
-          options.file.name = path.basename(options.file.attachment.path);
+      for (const i in options.files) {
-        } else {
+        let file = options.files[i];
-          options.file.name = 'file.jpg';
+        if (typeof file === 'string') file = { attachment: file };
+        if (!file.name) {
+          if (typeof file.attachment === 'string') {
+            file.name = path.basename(file.attachment);
+          } else if (file.attachment && file.attachment.path) {
+            file.name = path.basename(file.attachment.path);
+          } else {
+            file.name = 'file.jpg';
+          }
         }
+        options.files[i] = file;
       }
 
-      return this.client.resolver.resolveBuffer(options.file.attachment).then(file =>
+      return Promise.all(options.files.map(file =>
-        this.client.rest.methods.sendMessage(this, content, options, {
+        this.client.resolver.resolveBuffer(file.attachment).then(buffer => {
-          file,
+          file.file = buffer;
-          name: options.file.name,
+          return file;
         })
-      );
+      )).then(files => this.client.rest.methods.sendMessage(this, content, options, files));
     }
 
     return this.client.rest.methods.sendMessage(this, content, options);
@@ -135,6 +144,17 @@ class TextBasedChannel {
     return this.send(content, Object.assign(options, { embed }));
   }
 
+  /**
+   * Send files to this channel
+   * @param {FileOptions[]|string[]} files Files to send with the message
+   * @param {StringResolvable} [content] Text for the message
+   * @param {MessageOptions} [options] Options for the message
+   * @returns {Promise<Message>}
+   */
+  sendFiles(files, content, options) {
+    return this.send(content, Object.assign(options, { files }));
+  }
+
   /**
    * Send a file to this channel
    * @param {BufferResolvable} attachment File to send
@@ -144,7 +164,7 @@ class TextBasedChannel {
    * @returns {Promise<Message>}
    */
   sendFile(attachment, name, content, options = {}) {
-    return this.send(content, Object.assign(options, { file: { attachment, name } }));
+    return this.sendFiles([{ attachment, name }], content, options);
   }
 
   /**