Add writing back to data file after all guilds update their caches

app/index.js

@@ -5,6 +5,9 @@ const FileSystem = require("fs");
 const Dicsord = require("discord.js");
 const JSONFile = require("jsonfile");
 
+//my imports
+const Util = require("discordjs-util");
+
 //app component imports
 const GuildData = require("./models/guild-data.js");
 
@@ -14,7 +17,7 @@ const SAVE_FILE = "./guilds.json";
 module.exports = (client) => {
 	const guildsData = FileSystem.existsSync(SAVE_FILE) ? parseJSON(JSONFile.readFileSync(SAVE_FILE)) : {}; //pull saved data from file
 
-	parseLinksInAllGuilds(client.guilds, guildsData);
+	parseLinksInAllGuilds(client.guilds, guildsData).then(writeFile);
 
 	//set up an interval to check all the feeds
 
@@ -22,14 +25,20 @@ module.exports = (client) => {
 };
 
 function parseLinksInAllGuilds(guilds, guildsData) {
+	const promises = [];
 	for (let guild of guilds) {
 		const guildData = guildsData[guild.id];
 		if (guildData)
-			guildData.cachePastPostedLinks();
+			promises.push(guildData.cachePastPostedLinks());
 	}
+	return Promise.all(promises);
 }
 
 function parseJSON(json) {
 	const guildIDs = Object.keys(json);
 	guildIDs.forEach(guildID => { guildIDs[guildID] = new GuildData(guildIDs[guildID]); });
 }
+
+function writeFile(guildsData){
+	JSONFile.write(SAVE_FILE, guildsData, err => {if(err) Util.dateError(err); });
+}