added finding ipv4

Added a functionality to automatically detect the ipv4 address of the device

index.js

@@ -1,23 +1,45 @@
 var express = require('express');
 var qrTerminal = require('qrcode-terminal');
+var chalk = require('chalk');
+var fs = require('fs');
+var localIpV4Address = require('local-ipv4-address');
 
 var misc = require("./lib/misc.js");
 var constants = require("./lib/constants.js");
 
 var app = express();
 
 const port = 3000 || process.env.PORT;
+const pathInitial = __dirname + "/";
+var pathTotal = pathInitial + process.argv[2];
 
-var ipv4 = constants.IPv4;
+var ipv4 = "http://192.168.1.2:3000";
 
-app.listen(port, (req,res) => {
-  console.log("Server is live");
+localIpV4Address().then(function(ipAddress){
+    ipv4 = ipAddress;
+});
+
+
+if(process.argv.length != 3) {
+  console.log(chalk.red(":/ Something's missing in the arguments"));
+  console.log(chalk.green("It should be something like node index.js i_am_so_great.pdf"));
+  process.exit(0);
+}
+
+if(!fs.existsSync(pathTotal)) {
+  console.log(chalk.red("The file does not exist, Please check the file path again"));
+}
+else {
+
+  app.listen(port, (req,res) => {
+  //console.log("Server is live");
   misc.header();
   qrTerminal.generate(ipv4);
 
 });
 
 app.get('/', (req,res) => {
-  console.log("A GET req to the server was recieved");
-  res.sendFile(__dirname + "/files_to_send" + "/" + process.argv[2]);
+  console.log(`A download was observed from ${req.ip}`);
+  res.sendFile(pathInitial + process.argv[2]);
   });
+}

lib/constants.js

@@ -1,6 +1,3 @@
 module.exports = {
-  owner: "Sagar",
-  IPv4: "http://192.168.1.2:3000"
+  owner: "Sagar"
 }
-
-//A lot to be added :D

lib/misc.js

@@ -2,17 +2,20 @@ var fig = require('figlet');
 var chalk = require('chalk');
 
 module.exports.header = function () {
-  console.log("--------------------------------------------------");
-  console.log("File to be sent: " +process.argv[2]);
-  console.log("--------------------------------------------------");
+  console.log(chalk.green("--------------------------------------------------"));
+  console.log(chalk.green("File to be sent: " +process.argv[2]));
+  console.log(chalk.green("--------------------------------------------------"));
 }
 
-module.exports.emoji = figlet('（〜^∇^)〜', (err, data) => {
+module.exports.emoji = fig('SCAN IT  :)', (err, data) => {
   if(err) {
     console.log('Oops, something went wrong D:');
     return;
   }
   else {
-    console.log(data);
+    console.log(chalk.green(data));
   }
 });
+
+
+//Misc is turning out to be the place for all the party code :D