A first draft for a runescape discord bot.

Phileas.js

require('dotenv').config();
const Discord = require('discord.js');
const client = new Discord.Client();
const rsapi = require('runescape-api');
const fs = require('fs');




let mainChan;
let idNameMap = {};

client.on('ready', () => {
	init();
	console.log('Phileas, at your service');
	mainChan = client.channels.get(process.env.GENFAGID);
});



function nameToId(name) {
	
	var minDist = 1000;
	var closestItem, closestIds;
	
	name = name.toLowerCase().replace(/\s/g,'');
	if (idNameMap[name] !== undefined) 
		return idNameMap[name];
	//Find and return the next closest item
	for (var namekey in idNameMap) {
		
		var val = dziemba_levenshtein(name, namekey);
	
		if ( val < minDist) {
			minDist = val;
			
			closestItem = idNameMap[namekey][0].name;
			closestIds = idNameMap[namekey];
			
		}
	}
	mainChan.send("I'm sorry, but I could not find that item. Were you looking for " + closestItem + "?");
	return closestIds;
}


function init() {
	
	//Get that JSON into a crazy fuckin array or something I don't know
	let itemIdMap = JSON.parse(fs.readFileSync('./items.json', 'utf-8'));
	for (id in itemIdMap) {
		let name = itemIdMap[id].name.toLowerCase().replace(/\s/g,'');
		if (!(name in idNameMap)) {
			idNameMap[name] = [];
			
		} if (!({id, name} in idNameMap[name])) {
		//cause fuck whatever makes sense
		idNameMap[name].push({id : id, name :itemIdMap[id].name});
		}

	}
}

client.on('message', (message) => {
	var body = message.content;
	if (body.includes("!help")) {
		mainChan.send("I can show you GE prices. Format your query as <pr name of item>");
	}
	
	if (body.indexOf('<pr') != -1  && body.indexOf('>') != -1 && message.author.username != 'Phileas') {
		let itemName = body.substring(body.indexOf('<pr')+3, body.indexOf('>'));

		let itemId = nameToId(itemName);	
	    if (itemId !== undefined) {
			console.log(itemId);
			let iter = 0;
			let found = false;
			console.log(itemId.length);
			while(!found && iter < itemId.length) {
				console.log(iter);
				rsapi.osrs.ge.itemInformation(itemId[iter].id).then(function(item) {
					
					let embed = new Discord.RichEmbed()
					.setColor((item.item.today.price > 0) ?0x00AE86 : 0xFF0000)
					.setDescription(
					item.item.name + ": " + (item.item.current.price) + "gp\n"
					+ ((item.item.members == 'true') ? 'Members' : 'Free') + "\n"
					+ item.item.today.price + "gp"
					).setThumbnail(item.item.icon_large)
					;
					found = true;
					message.channel.send({embed});
					
				}).catch(console.error);
				iter++;
				
			}
		}
	}
});


//Derek Ziemba via https://gist.github.com/andrei-m/982927
function dziemba_levenshtein(a, b){
	var tmp;
	if (a.length === 0) { return b.length; }
	if (b.length === 0) { return a.length; }
	if (a.length > b.length) { tmp = a; a = b; b = tmp; }

	var i, j, res, alen = a.length, blen = b.length, row = Array(alen);
	for (i = 0; i <= alen; i++) { row[i] = i; }

	for (i = 1; i <= blen; i++) {
		res = i;
		for (j = 1; j <= alen; j++) {
			tmp = row[j - 1];
			row[j - 1] = res;
			res = b[i - 1] === a[j - 1] ? tmp : Math.min(tmp + 1, Math.min(res + 1, row[j] + 1));
		}
	}
	return res;
}

client.login(process.env.TOKEN);