This is the code used on club night (minor tweaks)

.gitignore

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+*.swp
+*.txt

README.md

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+# ECC Club Night Tool
+This is the program we used to do club night sign-ups for 2017-18. It may or
+may not be used in the future but I just wanted to leave it here in case
+anyone wants to use it in the future. Written in NodeJS.
+
+## Dependencies
+Use:
+```shell
+npm install [package]
+```
+Packages:
+- readline
+- fs (usually built-in)
+- colors
+
+## Usage
+This tool runs in the console.
+```shell
+clear
+node collect.js [list file]
+```
+
+## Validation
+To make sure nobody trolled you on the signups, validate.js tests for valid
+Exeter email addresses, and prints any offending text with the line number
+attached.
+```shell
+node validate.js [list file]
+```

collect.js

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+const readline = require('readline');
+const fs = require('fs');
+const colors = require('colors');
+const opts = {
+  input: process.stdin,
+  output: process.stdout,
+  prompt: 'Exeter Email > '.magenta.bold,
+};
+const fname = (process.argv.length > 2) ? process.argv[2] : 'ecc-list.txt';
+
+let rl = readline.createInterface(opts);
+let motd = [];
+motd.push('###########################################');
+motd.push('#                                         #');
+motd.push('#  Welcome to Exeter Computing Club 2017  #');
+motd.push('#          Check out our GitHub:          #');
+motd.push('#       https://github.com/exeter         #');
+motd.push('#                                         #');
+motd.push('###########################################');
+motd.push('');
+
+console.log(motd.join('\n').white.bold);
+rl.prompt();
+
+rl.on('line', (input) => {
+  let eml = input.trim().toLowerCase();
+  if (eml.indexOf('@') == -1) eml += '@exeter.edu';
+  fs.appendFileSync(fname, eml+'\n');
+  console.log('Thanks! We\'ll send you an email announcing our first meeting.');
+  rl.prompt();
+});
+rl.on('close', function () {
+  console.log('Bye!');
+});
+rl.on('SIGINT', function () {
+  rl.clearLine();
+  rl.prompt();
+});

validate.js

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+const fs = require('fs');
+const colors = require('colors');
+const fname = (process.argv.length > 2) ? process.argv[2] : 'ecc-list.txt';
+
+try {
+  data = fs.readFileSync(fname, 'utf-8');
+  let dlist = data.trimRight().split('\n');
+  for (let i = 0; i < dlist.length; i++) {
+    if (!dlist[i].trim().match(/^([a-z0-9]+)@exeter.edu$/i)) {
+      console.log(
+        ((i+1) + ': ').red.bold
+        + dlist[i].trim()
+      );
+    }
+  }
+} catch(e) {
+  console.error(e.stack);
+}