Fix 109 grunt lint errors

cli.js

@@ -4,19 +4,23 @@
  * @copyright Crown Copyright 2020
  * @license Apache-2.0
  */
-'use strict';
+"use strict";
 
 const fs = require("fs");
 
-///////// Helper Functions /////////
+/* * * * * Helper Functions * * * * */
 
-let slurpStream = (istream) => { // {{{1
-    // Slurp the contents of a stream up into a Buffer to pass to CyberChef
-    var ret = [];
-    var len = 0;
+/**
+ * Slurp the contents of a stream up into a Buffer to pass to CyberChef
+ *
+ * @param {Stream} istream
+ */
+const slurpStream = (istream) => { // {{{1
+    const ret = [];
+    let len = 0;
     return new Promise(resolve => {
-        istream.on('readable', () => {
-            var chunk;
+        istream.on("readable", () => {
+            let chunk;
             while ((chunk = istream.read()) !== null) {
                 ret.push(chunk);
                 len += chunk.length;
@@ -26,25 +30,35 @@ let slurpStream = (istream) => { // {{{1
     });
 }; // }}}1
 
-let slurp = (fname) => { // {{{1
-    // Slurp the contents of a file (or stdin) into a Buffer
+/**
+ * Slurp the contents of a file (or stdin) into a Buffer
+ *
+ * @param {String} fname
+ */
+const slurp = (fname) => { // {{{1
     let istream;
 
-    if (fname === undefined || fname == '-') {
+    if (fname === undefined || fname === "-") {
         istream = process.stdin;
         if (istream.isTTY) {
             return Promise.reject(new Error("TTY input not supported"));
         }
-    }
-    else {
-        istream = fs.createReadStream(fname, { flags: 'r' });
+    } else {
+        istream = fs.createReadStream(fname, { flags: "r" });
     }
     return slurpStream(istream);
 }; // }}}1
 
-let getPort = (value, dummyPrevious) => { // {{{1
-    // Get a valid port number from the command line
-    let ret = parseInt(value, 10);
+/**
+ * Get a valid port number from the command line
+ *
+ * Used by commander
+ *
+ * @param {String} value
+ * @param {String} dummyPrevious
+ */
+const getPort = (value, dummyPrevious) => { // {{{1
+    const ret = parseInt(value, 10);
     if (ret < 1 || ret > 65535) {
         throw new Error("invalid port number");
     }
@@ -52,29 +66,28 @@ let getPort = (value, dummyPrevious) => { // {{{1
 };
 // }}}1
 
-///////// MAIN ///////// {{{1
+/* * * * * MAIN * * * * */ // {{{1
 
 const chef = require("cyberchef");
 const program = require("commander");
 
 program
-    .version(require('./package.json').version)
-    .description('Bake data from files and/or TCP clients '
-        + 'using a CyberChef recipe.')
-    .usage('[options] [file [file ...]]')
-    .requiredOption('-r, --recipe-file <file>',
-        'recipe JSON file')
-    .option('-l, --listen [port]',
-        'listen on TCP port for data (random if not given)', getPort, false)
-    .option('-o, --output <file-or-dir>',
-        'where to write result (file input only; default:stdout)');
+    .version(require("./package.json").version)
+    .description("Bake data from files and/or TCP clients " +
+        "using a CyberChef recipe.")
+    .usage("[options] [file [file ...]]")
+    .requiredOption("-r, --recipe-file <file>",
+        "recipe JSON file")
+    .option("-l, --listen [port]",
+        "listen on TCP port for data (random if not given)", getPort, false)
+    .option("-o, --output <file-or-dir>",
+        "where to write result (file input only; default:stdout)");
 
 try {
     program.exitOverride().parse(process.argv);
-}
-catch (e) {
-    if (e.code != 'commander.helpDisplayed') {
-        console.error("Run with '--help' for usage");
+} catch (e) {
+    if (e.code !== "commander.helpDisplayed") {
+        console.error("Run with \"--help\" for usage");
     }
     process.exit(1);
 }
@@ -82,8 +95,8 @@ catch (e) {
 // If we get no inputs and we aren't running a server,
 // make stdin our single input
 let inputs = program.args;
-if (inputs.length == 0 && !program.listen) {
-    inputs = [ '-' ];
+if (inputs.length === 0 && !program.listen) {
+    inputs = ["-"];
 }
 
 // Likewise stdout for our output
@@ -92,17 +105,15 @@ let path;
 let outputIsDir = false;
 if (program.output === undefined && !program.listen) {
     ostream = process.stdout;
-}
-else if (inputs.length > 0) {
+} else if (inputs.length > 0) {
     // See if our output is a directory
     let st;
     try {
         st = fs.statSync(program.output);
         outputIsDir = st.isDirectory();
-    }
-    catch(err) {
-        // We're fine if the output doesn't exist yet
-        if (err.code != 'ENOENT') throw err;
+    } catch (err) {
+        // We"re fine if the output doesn"t exist yet
+        if (err.code !== "ENOENT") throw err;
     }
     if (!outputIsDir) {
         ostream = fs.createWriteStream(program.output);
@@ -120,12 +131,12 @@ slurp(program.recipeFile).then((data) => {
     })
     .then(() => {
         // First, deal with any files we want to read
-    for(let i of inputs) {
+        for (const i of inputs) {
             slurp(i).then((data) => {
-            let output = chef.bake(data, recipe);
+                const output = chef.bake(data, recipe);
                 if (outputIsDir) {
                     let outFileName = path.basename(i);
-                if (outFileName == '-') outFileName = 'from-stdin';
+                    if (outFileName === "-") outFileName = "from-stdin";
                     ostream = fs.createWriteStream(
                         path.join(program.output, outFileName));
                 }
@@ -146,10 +157,10 @@ slurp(program.recipeFile).then((data) => {
         // This is intentionally hardcoded to localhost to discourage
         // the use of this script as a production system.
         if (program.listen) {
-        const net = require('net');
+            const net = require("net");
             const server = net.createServer((socket) => {
                 slurpStream(socket).then((data) => {
-                let output = chef.bake(data, recipe);
+                    const output = chef.bake(data, recipe);
                     socket.write(output.presentAs("string", true));
                     socket.end();
                 })
@@ -160,15 +171,15 @@ slurp(program.recipeFile).then((data) => {
 
             // If no port given by user, let the OS choose one
             if (program.listen === true) program.listen = 0;
-        server.listen(program.listen, '127.0.0.1')
-            .on('listening', () => {
-                console.log('Now listening on '
-                    + server.address().address
-                    + ":" + server.address().port);
+            server.listen(program.listen, "127.0.0.1")
+                .on("listening", () => {
+                    console.log("Now listening on " +
+                        server.address().address +
+                        ":" + server.address().port);
                 });
 
             // Exit gracefully
-        process.on('SIGINT', () => {
+            process.on("SIGINT", () => {
                 console.log("Exiting");
                 server.close();
             });
@@ -177,4 +188,4 @@ slurp(program.recipeFile).then((data) => {
     .catch((err) => {
         console.error(err);
         process.exit(3);
-})
+    });