Add per server prefix (#7)

* Add ability to load server prefix

* Add ability to set prefix for a server

* Create serverPrefixes.json file if not found

commands/prefix.js

@@ -0,0 +1,15 @@
+const setServerPrefix = require("../util/setServerPrefix");
+
+module.exports = {
+    name: 'prefix',
+    description: 'Change the prefix of the bot in this server.',
+    execute({ message, client, args, prefix }) {
+        if (!args[0]) {
+            message.channel.send(`To change the prefix, execute \`${prefix}prefix <newPrefix>\``);
+            return;
+        }else{
+            setServerPrefix(client, args[0], message.guild.id)
+            message.channel.send(`The prefix for this server is now set to ${args[0]}`)
+        }
+    }
+};

server.js

@@ -1,8 +1,8 @@
 const fs = require('fs')
 const Discord = require('discord.js');
 const client = new Discord.Client({ disableEveryone: true });
-const {
-	prefix,
+let {
+	globalPrefix,
 	token,
 	loginMessage,
 	loginChannel,
@@ -11,19 +11,22 @@ const {
 } = require('./config.json');
 
 client.commands = new Discord.Collection();
+client.serverPrefixes = new Discord.Collection();
 
-var reloadCommands = require("./util/reloadCommands.js")
+var reloadCommands = require("./util/reloadCommands.js");
+const loadServerPrefixes = require('./util/loadServerPrefixes');
 reloadCommands(client)
 
 client.once('ready', () => {
 	console.log('Ready!');
-	client.user.setActivity(prefix, { type: 'LISTENING' });
+	client.user.setActivity(globalPrefix, { type: 'LISTENING' });
 	if (enableLoginMessage === true)
 	try{
 	client.channels.cache.get(loginChannel).send(loginMessage)
 	}catch(err){
 		console.log("Failed trying to send a message on login.\n")
 	}
+	loadServerPrefixes(client)
 });
 
 client.once('reconnecting', () => {
@@ -35,15 +38,23 @@ client.once('disconnect', () => {
 });
 
 client.on('message', async message => {
-	const args = message.content.slice(prefix.length).split(" ")
+
+	if (client.serverPrefixes.get(message.guild.id)) {
+		prefix = client.serverPrefixes.get(message.guild.id)
+	} else
+		prefix = globalPrefix
+
+	let args = message.content.slice(prefix.length).split(" ")
+
 	const commandName = args.shift().toLowerCase();
 	const command = client.commands.get(commandName);
 	if (!message.guild) return;
 	if (message.author.bot) return;
 	if (!message.content.startsWith(prefix)) return;
-	if (command.admin && owners.indexOf(message.author.id.toString()) == -1 ) return;
+	if (!command) return;
+	if (command.admin && owners.indexOf(message.author.id.toString()) == -1) return;
 	try {
-		command.execute({message:message, args:args, client: client})
+		command.execute({ message: message, args: args, client: client, prefix: prefix})
 	} catch (error) {
 		console.log(`${error}\n-------`)
 	}

util/loadServerPrefixes.js

@@ -0,0 +1,18 @@
+const fs = require('fs')
+
+
+module.exports = function (client) {
+    try {
+        if(!fs.existsSync('serverPrefixes.json')){
+            console.log("Creating loadServerPrefixes.json...")
+            fs.writeFileSync("serverPrefixes.json","[]")
+        }
+        const json = fs.readFileSync('serverPrefixes.json', 'utf8');
+        const serverPrefixes = JSON.parse(json);
+        serverPrefixes.forEach(server => {
+            client.serverPrefixes.set(server.id, server.prefix)
+        });
+    } catch (err) {
+        console.log(`Error reading file from disk: ${err}`);
+    }
+}

util/setServerPrefix.js

@@ -0,0 +1,27 @@
+const fs = require('fs');
+
+
+module.exports = function (client, newPrefix, guildID) {
+    let isExists = false;
+    const json = fs.readFileSync('serverPrefixes.json', 'utf8');
+    const serverPrefixes = JSON.parse(json);
+    serverPrefixes.forEach(function (server) {
+        if (server.id === guildID) {
+            server.prefix = newPrefix
+            client.serverPrefixes.set(server.id, newPrefix)
+            fs.writeFileSync("serverPrefixes.json", JSON.stringify(serverPrefixes));
+            isExists = true;
+        }
+    });
+    if (!isExists) {
+        let _newPrefix = {
+            "id": guildID, "prefix": newPrefix
+        }
+
+        serverPrefixes.push(_newPrefix)
+        console.log(serverPrefixes)
+
+        fs.writeFileSync("serverPrefixes.json", JSON.stringify(serverPrefixes))
+        client.serverPrefixes.set(guildID, newPrefix)
+    }
+}