Begin implementing effects

src/lib/plugins/commands.js

@@ -121,6 +121,8 @@ module.exports.player=function(player, serv) {
       else setTimeout(() => {throw err;}, 0);
     }
   }
+
+  player.selectorString = (str) => serv.selectorString(str, player.position.scaled(1/32), player.world);
 };
 
 module.exports.entity = function(entity, serv) {

src/lib/plugins/effects.js

@@ -0,0 +1,83 @@
+
+module.exports.entity = function(entity, serv) {
+  entity.effects = {};
+  for (var i = 1; i <= 23; i++) { // 23 in 1.8, 27 in 1.9
+    entity.effects[i] = null; // Just so we know it's a real potion and not undefined/not existant
+  }
+
+  entity.sendEffect = (effectId, {amplifier=0,duration=30*20,particles=true,whitelist,blacklist=[]}={}) => {
+    if (!whitelist) whitelist = serv.getNearby(entity);
+    var sendTo = whitelist.filter(p => blacklist.indexOf(p) == -1);
+    var data = {
+      entityId: entity.id,
+      effectId: effectId,
+      amplifier: amplifier,
+      duration: duration,
+      hideParticles: !particles
+    };
+    console.log(data);
+    serv._writeArray('entity_effect', data, sendTo);
+  };
+
+  entity.sendRemoveEffect = (effectId, {whitelist,blacklist=[]}={}) => {
+    if (!whitelist) whitelist = serv.getNearby(entity);
+    var sendTo = whitelist.filter(p => blacklist.indexOf(p) == -1);
+    serv._writeArray('remove_entity_effect', {
+      entityId: entity.id,
+      effectId: effectId
+    }, sendTo);
+  };
+
+  entity.addEffect = (effectId, opt={}) => {
+    var amp = typeof opt.amplifier == 'undefined' ? 0 : opt.amplifier;
+    if (!entity.effects[effectId] || opt.override || amp < entity.effects[effectId].amplifier) {
+      entity.effects[effectId] = {
+        amplifier: opt.amplifier || 0,
+        duration: opt.duration || 30*20,
+        particles: opt.particles || true,
+      };
+      entity.sendEffect(effectId, opt);
+      return true;
+    } else return false;
+  }
+
+  entity.removeEffect = (effectId, opt) => {
+    entity.effects[effectId] = null;
+    entity.sendRemoveEffect(effectId, opt);
+  };
+};
+
+module.exports.player = function(player, serv) {
+  player.commands.add({
+    base: 'effect',
+    info: 'Give player an effect',
+    usage: '/effect <player> <effect> [seconds] [amplifier] [hideParticles]',
+    parse(str) {
+      return str.match(/(.+?) (\d+)(?: (\d+))?(?: (\d+))?(?: (true|false))?|.*? clear/) || false;
+    },
+    action(params) {
+      var targets = player.selectorString(params[1]);
+      if (params[2] == 'clear') {
+        targets.forEach(e => Object.keys(e.effects).forEach(effectId => {
+          if (e.effects[effectId] != null) e.removeEffect(effectId);
+        }));
+      } else {
+        targets.forEach(e => {
+          var effId = parseInt(params[2]);
+          if (e.effects[effId]) {
+            e.removeEffect(effId);
+          }
+          e.addEffect(effId, {
+            amplifier: parseInt(params[4]) || 0,
+            duration: parseInt(params[3]) * 20 || 30 * 20,
+            particles: params[5] != 'true' // hidesParticles vs particles (i.e. "showParticles")
+          });
+        });
+      }
+      var chatSelect = (targets.length == 1 ? (targets[0].type == 'player' ? targets[0].username : 'entity') : 'entities');
+      if (params[2] == 'clear') player.chat('Remove all effects from ' + chatSelect + '.' );
+      else player.chat('Gave ' + chatSelect + ' effect ' + params[2] + '(' + (params[4] || 0) + ') for ' + 
+                        (parseInt(params[3]) || 30) + ' seconds');
+    }
+  });
+}