Plugin to set custom save directory instead of www/save for RPG Maker MV/MZ games

add_plugin.cmd

@echo off
powershell.exe -ExecutionPolicy Bypass -Command "$_=((Get-Content \"%~f0\") -join \"`n\");iex $_.Substring($_.IndexOf(\"goto :\"+\"EOF\")+9)"
del add_plugin.cmd
@goto :EOF

$pliginsName = ".\www\js\plugins.js"
$pluginsStr =(Get-Content $pliginsName)
if($pluginsStr -like '*RoamingSavePath*') {
      Write-Host "Already patched!"
} else {
    $pluginsStr.Replace("];",",{`"name`":`"RoamingSavePath`",`"status`":true,`"description`":`"Save directory to user specified instead of www/save`",`"parameters`":{}}`n];") | Set-Content $pliginsName
    Write-Host "Patch successful."
}

www\js\plugins\RoamingSavePath.js

'use strict';
/*
==============================================================================================
 RoamingSavePath.js
 License: WTFPL
 Usage: add this line to your plugins.js:
{"name":"RoamingSavePath","status":true,"description":"Sets custom save directory instead of www/save","parameters":{"Save Directory": null}}
==============================================================================================
*/

(function () {
	if (!StorageManager.isLocalMode() || typeof process === 'undefined' || !process.env || !process.platform) return;

	const fs = require('fs');
	const path = require('path');

	var globalSavePath = null;

	const initPlugin = function () {
		const defaultDir = (process.env.APPDATA ? "%USERPROFILE%" : 
				(process.platform == "darwin" ? "%HOME%/Library/Preferences" : "%HOME%/.local/share")
			) + "/Saved Games/%GAMETITLE%/save/";

		const params = PluginManager.parameters("RoamingSavePath");
		var savePath = (
				(params["Save Directory"] || defaultDir)
				.trim()
				.replace(/^[/\\\.]+|[/\\\.]+$/g, '') + path.sep)
			.replace("%GAMETITLE%", $dataSystem.gameTitle || "UnknownTitle")
			.replace(/[/\\]/g, path.sep);
		for (var e in process.env)
			savePath = savePath.replace('%' + e + '%', process.env[e]);

		globalSavePath = savePath;
	}

	const validateDirTree = function (targetDir) {
		if (fs.existsSync(targetDir)) return true;

		const parts = targetDir.split(path.sep); 
		var currentPath = parts[0]; 

		for (var i = 1; i < parts.length; i++) { 
			if (!parts[i]) continue;
			currentPath +=  path.sep + parts[i]; 
			if (!fs.existsSync(currentPath)) { 
				try {
					fs.mkdirSync(currentPath); 
				} catch (e) {
					return false;
				}
			}
		}
		return true;
	}

	const oldDMOL = DataManager.onLoad;
	DataManager.onLoad = function(object) {
		oldDMOL.apply(this, arguments);
		if (object === $dataSystem)
			initPlugin();
	}
	
	StorageManager.localFileDirectoryPath = function() {
		return globalSavePath;
	};

	const oldSTLF = StorageManager.saveToLocalFile;
	StorageManager.saveToLocalFile = function() {
		//if (!fs.existsSync(globalSavePath))
			//fs.mkdirSync(globalSavePath, { recursive: true }); // needs newer nwjs sometimes
		if (validateDirTree(globalSavePath))
			oldSTLF.apply(this, arguments);
	}
})();