Implement difficulty

* added some code to set the difficulty of the server

* Add difficulty variable
 Added difficulty to default-settings.json
 changed difficulty: 0 to difficulty: serv.difficulty in
 -respawn.js
 -world.js
 -login.js

* set server diff
* added setting serv difficulty on server start in settings.js
* added serv in module.exports.player=function(player, serv) in player.js and in respawn.js

config/default-settings.json

@@ -5,6 +5,7 @@
   "online-mode": true,
   "logging": true,
   "gameMode": 1,
+  "difficulty": 1,
   "worldFolder":"world",
   "generation": {
     "name": "diamond_square",

src/lib/plugins/login.js

@@ -56,7 +56,7 @@ module.exports.player=function(player,serv,settings)
       levelType: 'default',
       gameMode: player.gameMode,
       dimension: 0,
-      difficulty: 0,
+      difficulty: serv.difficulty,
       reducedDebugInfo: false,
       maxPlayers: serv._server.maxPlayers
     });

src/lib/plugins/players.js

@@ -13,7 +13,7 @@ module.exports.server=function(serv)
   };
 };
 
-module.exports.player=function(player){
+module.exports.player=function(player, serv){
   player.commands.add({
     base: 'gamemode',
     aliases: ['gm'],
@@ -30,4 +30,22 @@ module.exports.player=function(player){
       player.setGameMode(mode);
     }
   });
+
+  player.commands.add({
+    base: 'difficulty',
+    aliases: ['diff'],
+    info: 'Sets the difficulty level',
+    usage: '/difficulty <difficulty>',
+    op: true,
+    parse(str){
+      let results;
+      if(!(results = str.match(/^([0-3])$/)))
+        return false;
+      return parseInt(str);
+    },
+    action(diff){
+      serv._writeAll('difficulty', {difficulty: diff});
+      serv.difficulty = diff;
+    }
+  });
 };

src/lib/plugins/respawn.js

@@ -1,11 +1,11 @@
-module.exports.player=function(player)
+module.exports.player=function(player, serv)
 {
   player._client.on("client_command", ({payload}) => {
     if(payload == 0) {
       player.behavior('requestRespawn', {}, () => {
         player._client.write("respawn",{
           dimension:0,
-          difficulty:0,
+          difficulty:serv.difficulty,
           gamemode:player.gameMode,
           levelType:'default'
         });

src/lib/plugins/settings.js

@@ -8,6 +8,7 @@ function randomInt (low, high) {
 module.exports.server=function(serv,settings)
 {
   serv.gameMode=settings.gameMode;
+  serv.difficulty=settings.difficulty;
 
   async function findSpawnZone(world,initialPoint)
   {

src/lib/plugins/world.js

@@ -184,7 +184,7 @@ module.exports.player=function(player,serv,settings) {
     if (typeof opt.gamemode != 'undefined') player.gameMode = opt.gamemode;
     player._client.write("respawn",{
       dimension: opt.dimension || 0,
-      difficulty: opt.difficulty || 0,
+      difficulty: opt.difficulty || serv.difficulty,
       gamemode: opt.gamemode || player.gameMode,
       levelType:'default'
     });