Added option to change data folder location. (#17)

Removed commonDirectory.
Removed instanceDirectory.
Added dataDirectory. The common and instance directories are now resolved from this.
The config.json and distribution.json are now stored in Electron's data folder (app.getPath('userData')).
Users can edit the dataDirectory under launcher settings.

app/assets/js/configmanager.js

@@ -1,13 +1,46 @@
-const fs     = require('fs-extra')
-const os     = require('os')
-const path   = require('path')
+const fs   = require('fs-extra')
+const os   = require('os')
+const path = require('path')
 
 const logger = require('./loggerutil')('%c[ConfigManager]', 'color: #a02d2a; font-weight: bold')
 
 const sysRoot = process.env.APPDATA || (process.platform == 'darwin' ? process.env.HOME + '/Library/Application Support' : process.env.HOME)
 const dataPath = path.join(sysRoot, '.westeroscraft')
 
-const firstLaunch = !fs.existsSync(dataPath)
+// Forked processes do not have access to electron, so we have this workaround.
+const launcherDir = process.env.CONFIG_DIRECT_PATH || require('electron').remote.app.getPath('userData')
+
+/**
+ * Retrieve the absolute path of the launcher directory.
+ * 
+ * @returns {string} The absolute path of the launcher directory.
+ */
+exports.getLauncherDirectory = function(){
+    return launcherDir
+}
+
+/**
+ * Get the launcher's data directory. This is where all files related
+ * to game launch are installed (common, instances, java, etc).
+ * 
+ * @returns {string} The absolute path of the launcher's data directory.
+ */
+exports.getDataDirectory = function(def = false){
+    return !def ? config.settings.launcher.dataDirectory : DEFAULT_CONFIG.settings.launcher.dataDirectory
+}
+
+/**
+ * Set the new data directory.
+ * 
+ * @param {string} dataDirectory The new data directory.
+ */
+exports.setDataDirectory = function(dataDirectory){
+    config.settings.launcher.dataDirectory = dataDirectory
+}
+
+const configPath = path.join(exports.getLauncherDirectory(), 'config.json')
+const configPathLEGACY = path.join(dataPath, 'config.json')
+const firstLaunch = !fs.existsSync(configPath) && !fs.existsSync(configPathLEGACY)
 
 exports.getAbsoluteMinRAM = function(){
     const mem = os.totalmem()
@@ -56,7 +89,8 @@ const DEFAULT_CONFIG = {
             launchDetached: true
         },
         launcher: {
-            allowPrerelease: false
+            allowPrerelease: false,
+            dataDirectory: dataPath
         }
     },
     newsCache: {
@@ -64,8 +98,6 @@ const DEFAULT_CONFIG = {
         content: null,
         dismissed: false
     },
-    commonDirectory: path.join(dataPath, 'common'),
-    instanceDirectory: path.join(dataPath, 'instances'),
     clientToken: null,
     selectedServer: null, // Resolved
     selectedAccount: null,
@@ -81,8 +113,7 @@ let config = null
  * Save the current configuration to a file.
  */
 exports.save = function(){
-    const filePath = path.join(dataPath, 'config.json')
-    fs.writeFileSync(filePath, JSON.stringify(config, null, 4), 'UTF-8')
+    fs.writeFileSync(configPath, JSON.stringify(config, null, 4), 'UTF-8')
 }
 
 /**
@@ -92,24 +123,29 @@ exports.save = function(){
  * need to be externally assigned.
  */
 exports.load = function(){
-    // Determine the effective configuration.
-    const filePath = path.join(dataPath, 'config.json')
+    let doLoad = true
 
-    if(!fs.existsSync(filePath)){
+    if(!fs.existsSync(configPath)){
         // Create all parent directories.
-        fs.ensureDirSync(path.join(filePath, '..'))
-        config = DEFAULT_CONFIG
-        exports.save()
-    } else {
+        fs.ensureDirSync(path.join(configPath, '..'))
+        if(fs.existsSync(configPathLEGACY)){
+            fs.moveSync(configPathLEGACY, configPath)
+        } else {
+            doLoad = false
+            config = DEFAULT_CONFIG
+            exports.save()
+        }
+    }
+    if(doLoad){
         let doValidate = false
         try {
-            config = JSON.parse(fs.readFileSync(filePath, 'UTF-8'))
+            config = JSON.parse(fs.readFileSync(configPath, 'UTF-8'))
             doValidate = true
         } catch (err){
             logger.error(err)
             logger.log('Configuration file contains malformed JSON or is corrupt.')
             logger.log('Generating a new configuration file.')
-            fs.ensureDirSync(path.join(filePath, '..'))
+            fs.ensureDirSync(path.join(configPath, '..'))
             config = DEFAULT_CONFIG
             exports.save()
         }
@@ -152,15 +188,6 @@ function validateKeySet(srcObj, destObj){
     return destObj
 }
 
-/**
- * Retrieve the absolute path of the launcher directory.
- * 
- * @returns {string} The absolute path of the launcher directory.
- */
-exports.getLauncherDirectory = function(){
-    return dataPath
-}
-
 /**
  * Check to see if this is the first time the user has launched the
  * application. This is determined by the existance of the data path.
@@ -218,7 +245,7 @@ exports.setNewsCacheDismissed = function(dismissed){
  * @returns {string} The launcher's common directory.
  */
 exports.getCommonDirectory = function(){
-    return config.commonDirectory
+    return path.join(exports.getDataDirectory(), 'common')
 }
 
 /**
@@ -228,7 +255,7 @@ exports.getCommonDirectory = function(){
  * @returns {string} The launcher's instance directory.
  */
 exports.getInstanceDirectory = function(){
-    return config.instanceDirectory
+    return path.join(exports.getDataDirectory(), 'instances')
 }
 
 /**