use new prismarine-provider-anvil to read/write the seed, use a world…

…Folder option instead of regionFolder option, fix #178

config/default-settings.json

@@ -5,7 +5,7 @@
   "online-mode": true,
   "logging": true,
   "gameMode": 1,
-  "regionFolder":"world/region",
+  "worldFolder":"world",
   "generation": {
     "name": "diamond_square",
     "options":{

doc/API.md

@@ -226,7 +226,7 @@ Options is an object containing the following properties:
 }
 ```
 * modpe: defaults to false, wether or not modpe should be enabled.
-* regionFolder : the region folder of the saved world
+* worldFolder : the world folder of the saved world (containing region, level.dat,...)
 * plugins
 * view-distance
 * player-list-text : an object with keys header and footer, displayed on the player list

package.json

@@ -31,11 +31,13 @@
     "mkdirp": "0.5.1",
     "moment": "^2.10.6",
     "node-dir": "~0.1.9",
+    "node-promise-es6": "^0.3.0",
     "node-uuid": "^1.4.3",
     "prismarine-block": "0.1.0",
     "prismarine-chunk": "0.2.1",
     "prismarine-entity": "0.2.0",
     "prismarine-item": "0.0.0",
+    "prismarine-provider-anvil": "^0.2.0",
     "prismarine-windows": "0.0.0",
     "prismarine-world": "0.4.0",
     "prismarine-world-sync": "0.1.0",

src/lib/plugins/world.js

@@ -4,9 +4,28 @@ const World = require('prismarine-world');
 const WorldSync = require("prismarine-world-sync");
 
 const generations=require("flying-squid").generations;
+import {fs} from 'node-promise-es6';
+import {level} from 'prismarine-provider-anvil';
 
-module.exports.server=function(serv,{regionFolder,generation={"name":"diamond_square","options":{"worldHeight":80}}}={}) {
-  generation.options.seed=generation.options.seed || Math.random()*Math.pow(2, 32);
+module.exports.server=async function(serv,{worldFolder,generation={"name":"diamond_square","options":{"worldHeight":80}}}={}) {
+  const regionFolder=worldFolder+"/region";
+  try {
+    const stats = await fs.stat(regionFolder);
+  }
+  catch(err) {
+    await fs.mkdir(regionFolder);
+  }
+
+  let seed;
+  try {
+    const levelData=await level.readLevel(worldFolder+"/level.dat");
+    seed=levelData["RandomSeed"][0];
+  }
+  catch(err){
+    seed=generation.options.seed || Math.floor(Math.random()*Math.pow(2, 31));
+    await level.writeLevel(worldFolder+"/level.dat",{"RandomSeed":[seed,0]});
+  }
+  generation.options.seed=seed;
   serv.emit("seed",generation.options.seed);
   serv.overworld = new World(generations[generation.name](generation.options), regionFolder);
   serv.netherworld = new World(generations["nether"]({}));