Properly parse object based launch args

Closes #90

README.md

@@ -67,6 +67,7 @@ launcher.on('data', (e) => console.log(e));
 | `options.os`             | String   | windows, osx or linux. MCLC will auto determine the OS if this field isn't provided.      | False    |
 | `options.customLaunchArgs`| Array   | Array of custom Minecraft arguments you want to add.                                      | False    |
 | `options.customArgs`     | Array    | Array of custom Java arguments you want to add.                                           | False    |
+| `options.features`       | Array    | Array of game argument feature flags. ex: `is_demo_user` or `has_custom_resolution`       | False    |
 | `options.version.number` | String   | Minecraft version that is going to be launched.                                           | True     |
 | `options.version.type`   | String   | Any string. The actual Minecraft launcher uses `release` and `snapshot`.                  | True     |
 | `options.version.custom` | String   | The name of the folder, jar file, and version json in the version folder.                 | False    |
@@ -81,7 +82,7 @@ launcher.on('data', (e) => console.log(e));
 | `options.proxy.username` | String   | Username for the proxy.                                                                   | False    |
 | `options.proxy.password` | String   | Password for the proxy.                                                                   | False    |
 | `options.timeout`        | Integer  | Timeout on download requests.                                                             | False    |
-| `options.window.width`   | String   | Width of the Minecraft Client                                                             | False    |
+| `options.window.width`   | String   | Width of the Minecraft Client.                                                            | False    |
 | `options.window.height`  | String   | Height of the Minecraft Client.                                                           | False    |
 | `options.window.fullscreen`  | Boolean| Fullscreen the Minecraft Client.                                                        | False    |
 | `options.overrides`      | Object   | Json object redefining paths for better customization. Example below.                     | False    |
@@ -130,7 +131,7 @@ If you are loading up a client outside of vanilla Minecraft or Forge (Optifine a
 ##### Installer
 This runs an executable with specified launch arguments. Was used to support Forge 1.13 before ForgeWrapper.
 ##### Authentication
-MCLC's authenticator module does not support Microsoft authentication. You will need to use a library like [MSMC](https://github.com/Hanro50/MSMC). If you weant to create your own solution, the following is the authorization JSON object format.
+MCLC's authenticator module does not support Microsoft authentication. You will need to use a library like [MSMC](https://github.com/Hanro50/MSMC). If you want to create your own solution, the following is the authorization JSON object format.
 ```js
 {
     access_token: '',
@@ -140,7 +141,7 @@ MCLC's authenticator module does not support Microsoft authentication. You will
     user_properties: '{}',
     meta: {
         type: 'mojang' || 'msa',
-        demo: true || false,
+        demo: true || false, // Demo can also be specified by addomg 'is_demo_user' to the options.feature array 
         // properties only exists for specific Minecraft versions.
         xuid: '',
         clientId: ''

components/handler.js

@@ -557,6 +557,7 @@ class Handler {
 
     const minArgs = this.options.overrides.minArgs || this.isLegacy() ? 5 : 11
     if (args.length < minArgs) args = args.concat(this.version.minecraftArguments ? this.version.minecraftArguments.split(' ') : this.version.arguments.game)
+    if (this.options.customLaunchArgs) args = args.concat(this.options.customLaunchArgs)
 
     this.options.authorization = await Promise.resolve(this.options.authorization)
     this.options.authorization.meta = this.options.authorization.meta ? this.options.authorization.meta : { type: 'mojang' }
@@ -574,24 +575,63 @@ class Handler {
       '${assets_root}': assetPath,
       '${game_assets}': assetPath,
       '${version_type}': this.options.version.type,
-      '${clientid}': this.options.authorization.meta.clientId || (this.options.authorization.client_token || this.options.authorization.access_token)
+      '${clientid}': this.options.authorization.meta.clientId || (this.options.authorization.client_token || this.options.authorization.access_token),
+      '${resolution_width}' : this.options.window ? this.options.window.width : 856,
+      '${resolution_height}': this.options.window ? this.options.window.height : 482,
     }
 
-    if (this.options.authorization.meta.demo) {
+    if (this.options.authorization.meta.demo && (this.options.features ? !this.options.features.includes('is_demo_user') : true)) {
       args.push('--demo')
     }
 
+    const replaceArg = (obj, index) => {
+      if (Array.isArray(obj.value)) {
+        for (const arg of obj.value) {
+          console.log(arg)
+          args.push(arg)
+        }
+      } else {
+        args.push(obj.value)
+      }
+      delete args[index]
+    }
+
     for (let index = 0; index < args.length; index++) {
-      if (typeof args[index] === 'object') args.splice(index, 2)
+      if (typeof args[index] === 'object') {
+        if (args[index].rules) {
+          if (!this.options.features) continue
+          const featureFlags = []
+          for (const rule of args[index].rules) {
+            featureFlags.push(...Object.keys(rule.features))
+          }
+          let hasAllRules = true
+          for (const feature of this.options.features) {
+            if (!featureFlags.includes(feature)) {
+              hasAllRules = false
+            }
+          }
+          if (hasAllRules) replaceArg(args[index], index)
+        } else {
+          replaceArg(args[index], index)
+        }
+      } else {
         if (Object.keys(fields).includes(args[index])) {
           args[index] = fields[args[index]]
         }
       }
+    }
+    args = args.filter((value) => {
+      return typeof value === 'string' || typeof value === 'number'
+    })
 
     if (this.options.window) {
       this.options.window.fullscreen
         ? args.push('--fullscreen')
-        : args.push('--width', this.options.window.width, '--height', this.options.window.height)
+        : () => {
+          if (this.options.features ? !this.options.features.includes('has_custom_resolution') : true) {
+            args.push('--width', this.options.window.width, '--height', this.options.window.height)
+          }
+        }
     }
     if (this.options.server) args.push('--server', this.options.server.host, '--port', this.options.server.port || '25565')
     if (this.options.proxy) {
@@ -606,7 +646,7 @@ class Handler {
         this.options.proxy.password
       )
     }
-    if (this.options.customLaunchArgs) args = args.concat(this.options.customLaunchArgs)
+
     this.client.emit('debug', '[MCLC]: Set launch options')
     return args
   }

index.d.ts

@@ -62,6 +62,10 @@ declare module "minecraft-launcher-core" {
      * Array of custom Java arguments
      */
     customArgs?: Array<string>;
+    /**
+     * Array of game argument feature flags
+     */
+    features?: Array<string>;
     /**
      * minecraft version info
      */

package.json

@@ -1,6 +1,6 @@
 {
   "name": "minecraft-launcher-core",
-  "version": "3.16.14",
+  "version": "3.16.15",
   "description": "Lightweight module that downloads and runs Minecraft using javascript / NodeJS",
   "main": "index.js",
   "dependencies": {