From ad9474a6e950b6727e3ddf982b1b366e3827a7a1 Mon Sep 17 00:00:00 2001
From: Varun Patil <radialapps@gmail.com>
Date: Tue, 5 May 2020 23:19:00 +0530
Subject: [PATCH] Save game to indexeddb

---
 binding-mruby/mrb-ext/kernel.cpp | 17 +++++++++++++++
 js/localforage.min.js            |  7 +++++++
 shell.html                       | 36 +++++++++++++++++++++++++++++++-
 src/emscripten.cpp               |  4 ++++
 src/emscripten.hpp               |  2 ++
 5 files changed, 65 insertions(+), 1 deletion(-)
 create mode 100644 js/localforage.min.js

diff --git a/binding-mruby/mrb-ext/kernel.cpp b/binding-mruby/mrb-ext/kernel.cpp
index e43baf5..5b83d22 100644
--- a/binding-mruby/mrb-ext/kernel.cpp
+++ b/binding-mruby/mrb-ext/kernel.cpp
@@ -37,6 +37,10 @@
 #include "filesystem.h"
 #include "binding.h"
 
+#ifdef __EMSCRIPTEN__
+#include "emscripten.hpp"
+#endif
+
 void mrbBindingTerminate();
 
 MRB_FUNCTION(kernelLoadData)
@@ -82,10 +86,23 @@ MRB_FUNCTION(kernelSaveData)
 	return mrb_nil_value();
 }
 
+MRB_FUNCTION(kernelSaveAsync)
+{
+	mrb_value obj;
+	const char *filename;
+
+	mrb_get_args(mrb, "z", &filename);
+
+	save_file_async_js(filename);
+
+	return mrb_nil_value();
+}
+
 void kernelBindingInit(mrb_state *mrb)
 {
 	RClass *module = mrb->kernel_module;
 
 	mrb_define_module_function(mrb, module, "load_data", kernelLoadData, MRB_ARGS_REQ(1));
 	mrb_define_module_function(mrb, module, "save_data", kernelSaveData, MRB_ARGS_REQ(2));
+	mrb_define_module_function(mrb, module, "save_file_async", kernelSaveAsync, MRB_ARGS_REQ(1));
 }
diff --git a/js/localforage.min.js b/js/localforage.min.js
new file mode 100644
index 0000000..eb87534
--- /dev/null
+++ b/js/localforage.min.js
@@ -0,0 +1,7 @@
+/*!
+    localForage -- Offline Storage, Improved
+    Version 1.7.3
+    https://localforage.github.io/localForage
+    (c) 2013-2017 Mozilla, Apache License 2.0
+*/
+!function(a){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=a();else if("function"==typeof define&&define.amd)define([],a);else{var b;b="undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof self?self:this,b.localforage=a()}}(function(){return function a(b,c,d){function e(g,h){if(!c[g]){if(!b[g]){var i="function"==typeof require&&require;if(!h&&i)return i(g,!0);if(f)return f(g,!0);var j=new Error("Cannot find module '"+g+"'");throw j.code="MODULE_NOT_FOUND",j}var k=c[g]={exports:{}};b[g][0].call(k.exports,function(a){var c=b[g][1][a];return e(c||a)},k,k.exports,a,b,c,d)}return c[g].exports}for(var f="function"==typeof require&&require,g=0;g<d.length;g++)e(d[g]);return e}({1:[function(a,b,c){(function(a){"use strict";function c(){k=!0;for(var a,b,c=l.length;c;){for(b=l,l=[],a=-1;++a<c;)b[a]();c=l.length}k=!1}function d(a){1!==l.push(a)||k||e()}var e,f=a.MutationObserver||a.WebKitMutationObserver;if(f){var g=0,h=new 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diff --git a/shell.html b/shell.html
index 9afb2af..db05179 100644
--- a/shell.html
+++ b/shell.html
@@ -3,6 +3,8 @@
   <head>
     <meta charset="utf-8">
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+    <script src="js/localforage.min.js"></script>
+
     <title>MKXP</title>
     <style>
     	body {
@@ -100,9 +102,41 @@
     </div>
 
     <script type='text/javascript'>
+      var namespace = 'kne';
+      window.saveFile = function(filename) {
+          const buf = FS.readFile('/game/' + filename);
+          const b64 = btoa(String.fromCharCode.apply(null, buf));
+          localforage.setItem(namespace + filename, b64);
+
+          localforage.getItem(namespace, function(err, res) {
+              if (err || !res) res = {};
+              res[filename] = 1;
+              localforage.setItem(namespace, res);
+          });
+      };
+
+      var loadFiles = function() {
+          localforage.getItem(namespace, function(err, res) {
+              if (err || !res) return;
+
+              const keys = Object.keys(res);
+
+              console.log('Locally stored savefiles', keys);
+
+              keys.forEach((key) => {
+                  localforage.getItem(namespace + key, (err, res) => {
+                      if (err) return;
+
+                      const buf = new Uint8Array(atob(res).split('').map((c) => c.charCodeAt(0)));
+                      FS.writeFile('/game/' + key, buf);
+                  });
+              });
+          });
+      }
+
       var Module = {
         preRun: [],
-        postRun: [],
+        postRun: [loadFiles],
         print: (function() {
           return function(text) {
             console.log(text);
diff --git a/src/emscripten.cpp b/src/emscripten.cpp
index 7f31f84..1653502 100644
--- a/src/emscripten.cpp
+++ b/src/emscripten.cpp
@@ -59,5 +59,9 @@ void load_file_async(const char * filename) {
 	shState->fileSystem().openRead(handler, filename);
 }
 
+EM_JS(void, save_file_async_js, (const char* fullPathC), {
+	if (window.saveFile) window.saveFile(UTF8ToString(fullPathC));
+});
+
 #endif
 
diff --git a/src/emscripten.hpp b/src/emscripten.hpp
index a814968..bf49ac7 100644
--- a/src/emscripten.hpp
+++ b/src/emscripten.hpp
@@ -8,6 +8,8 @@ extern "C" {
 	void load_file_async_js(const char* fullPathC);
 
 	void load_file_async(const char* filename);
+
+	void save_file_async_js(const char* fullPathC);
 }
 
 #endif