HW4 - Express app

.eslintrc

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+{
+  "extends": "es2015",
+  "parserOptions": {
+    "ecmaVersion": 6,
+    "sourceType": "module"
+  }
+}

hw1/.eslintrc

@@ -1,3 +1,7 @@
 {
-  "extends": "es2015"
+  "extends": "es2015",
+  "parserOptions": {
+    "ecmaVersion": 6,
+    "sourceType": "module"
+  }
 }

hw3/.eslintrc

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+{
+  "extends": "es2015"
+}

hw3/README.MD

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+# Usage examples
+
+### 1. Reverse string from process.stdin to process.stdout
+`npm start -- -a reverse`
+
+`npm start -- --action=reverse`
+
+
+
+### 2. Convert string to uppercase from process.stdin to process.stdout
+
+`npm start -- -a transform`
+
+`npm start -- --action=transform`
+
+
+
+### 3. Read file and print to console
+
+`npm start -- -a outputFile -f users.txt`
+
+`npm start -- --action=outputFile --file=users.txt`
+
+
+
+### 4. Read .csv file, convert to JSON and print to console
+
+`npm start -- -a convertFromFile -f users.csv`
+
+`npm start -- --action=convertFromFile --file=users.csv`
+
+
+### 5. Read .csv file, convert to JSON and write to .json file with the same name
+
+`npm start -- -a convertToFile -f users.csv`
+
+`npm start -- --action=convertToFile --file=users.csv`
+
+
+### 6. Bundle all css files from given folder and add extra css styles for own file
+
+`npm start -- -a cssBundler -p ./assets/css`
+
+`npm start -- --action=cssBundler --path=./assets/css`

hw3/package.json

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+{
+  "name": "hw3",
+  "version": "1.0.0",
+  "description": "",
+  "main": "utils/streams.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "start": "node utils/streams.js"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/okachynskyy/nodejs-homeworks.git"
+  },
+  "keywords": [
+    "nodejs"
+  ],
+  "author": "Oleksiy Kachynskyy <oleksiy.kachynskyy@gmail.com>",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/okachynskyy/nodejs-homeworks/issues"
+  },
+  "homepage": "https://github.com/okachynskyy/nodejs-homeworks#readme",
+  "dependencies": {
+    "commander": "^2.15.1",
+    "csvjson": "^5.0.0",
+    "through2": "^2.0.3"
+  }
+}

hw3/utils/assets/css/1.css

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+body {
+  color: red;
+}

hw3/utils/assets/css/2.css

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+.header {
+  background-color: gray;
+}

hw3/utils/lib/convert-from-file.js

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+const fs = require('fs');
+const through = require('through2');
+const csvJson = require('csvjson');
+
+module.exports = (filePath, stdOut) => {
+  const parseCsv = function (buffer, encoding, next) {
+    const parsedCsv = csvJson.toObject(buffer.toString());
+    this.push(JSON.stringify(parsedCsv));
+    next();
+  }
+
+  fs.createReadStream(filePath)
+    .pipe(through(parseCsv))
+    .pipe(stdOut);
+}

hw3/utils/lib/convert-to-file.js

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+const fs = require('fs');
+const path = require('path');
+const through = require('through2');
+const csvJson = require('csvjson');
+const pUtils = require('./path-utils');
+
+module.exports = (filePath) => {
+  const parseCsv = function (buffer, encoding, next) {
+    const parsedCsv = csvJson.toObject(buffer.toString());
+    this.push(JSON.stringify(parsedCsv));
+    next();
+  }
+
+  const outputFilePath = pUtils.replaceExt(filePath, '.json');
+  fs.createReadStream(filePath)
+    .pipe(through(parseCsv))
+    .pipe(fs.createWriteStream(outputFilePath));
+
+  console.info(`Done! Data saved to: \n${outputFilePath}`);
+}

hw3/utils/lib/css-bundler.js

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+const fs = require('fs');
+const path = require('path');
+
+module.exports = (folderPath) => {
+  const files = fs.readdirSync(folderPath);
+  const outputFilePath = path.resolve(folderPath, `bundle.css`);
+  const outStream = fs.createWriteStream(outputFilePath);
+
+  files.forEach(file => {
+    const filePath = path.resolve(folderPath, file);
+    fs.createReadStream(filePath).pipe(outStream);
+  });
+
+  const extraContent = path.resolve(__dirname, './css-data/nodejs18-hw3-css.css');
+  fs.createReadStream(extraContent).pipe(outStream);
+
+  console.info(`Done! Styles saved to: \n${outputFilePath}`);
+}

hw3/utils/lib/css-data/nodejs18-hw3-css.css

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+.ngmp18 {
+  background-color: #fff;
+  overflow: hidden;
+  width: 100%;
+  height: 100%;
+  position: relative;
+}
+
+.ngmp18__hw3 {
+  color: #333;
+}
+
+.ngmp18__hw3--t7 {
+  font-weight: bold;
+}

hw3/utils/lib/output-file.js

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+const fs = require('fs');
+const path = require('path');
+
+module.exports = (filePath, stdOut) => {
+  fs.createReadStream(filePath).pipe(stdOut);
+}

hw3/utils/lib/path-utils.js

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+const fs = require('fs');
+const path = require('path');
+
+const resolveFilePath = (dir, fileName) => {
+  if (!fileName) {
+    throw new Error('Please, provide a file name!');
+  }
+  const filePath = path.resolve(__dirname, `../${fileName}`);
+
+  if (!fs.existsSync(filePath)) {
+    throw new Error(`File not exist: ${filePath}`);
+  }
+
+  return filePath;
+};
+
+const resolveFolderPath = (dir, relativeFolderPath) => {
+  if (!relativeFolderPath) {
+    throw new Error('Please, provide a folder path!');
+  }
+  const folderPath = path.resolve(__dirname, `../${relativeFolderPath}`);
+
+  if (!fs.existsSync(folderPath)) {
+    throw new Error(`Folder not exist: ${folderPath}`);
+  }
+
+  return folderPath;
+};
+
+const replaceExt = (npath, ext) => {
+  if (typeof npath !== 'string') {
+    return npath;
+  }
+
+  if (npath.length === 0) {
+    return npath;
+  }
+
+  var nFileName = path.basename(npath, path.extname(npath)) + ext;
+  return path.join(path.dirname(npath), nFileName);
+}
+
+module.exports = {
+  resolveFilePath,
+  resolveFolderPath,
+  replaceExt
+}

hw3/utils/lib/reverse.js

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+const through = require('through2');
+
+module.exports = (stdIn, stdOut) => {
+  const transform = function (buffer, encoding, next) {
+    const input = buffer.toString();
+
+    const strArray = input.split('');
+    strArray.unshift(strArray.pop())
+    const output = strArray.reverse().join('');
+
+    this.push(output);
+    next();
+  };
+
+  stdIn.pipe(through(transform)).pipe(stdOut);
+}

hw3/utils/lib/transform.js

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+const through = require('through2');
+
+module.exports = (stdin, stdout) => {
+  const transform = function (buffer, encoding, next) {
+    this.push(buffer.toString().toUpperCase());
+    next();
+  }
+
+  stdin.pipe(through(transform)).pipe(stdout);
+}

hw3/utils/streams.js

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+const program = require('commander');
+const pUtils = require('./lib/path-utils');
+
+program
+  .version('0.1.0')
+  .option('-a, --action [value]', 'Provide necessary action name')
+  .option('-f, --file [value]', 'File name')
+  .option('-p, --path [value]', 'Folder path')
+  .parse(process.argv);
+
+try {
+  let filePath;
+  switch (program.action) {
+    case 'reverse':
+      require('./lib/reverse')(process.stdin, process.stdout);
+      break;
+    case 'transform':
+      require('./lib/transform')(process.stdin, process.stdout);
+      break;
+    case 'outputFile':
+      filePath = pUtils.resolveFilePath(__dirname, program.file);
+      require('./lib/output-file')(filePath, process.stdout);
+      break;
+    case 'convertFromFile':
+      filePath = pUtils.resolveFilePath(__dirname, program.file);
+      require('./lib/convert-from-file')(filePath, process.stdout);
+      break;
+    case 'convertToFile':
+      filePath = pUtils.resolveFilePath(__dirname, program.file);
+      require('./lib/convert-to-file')(filePath);
+      break;
+    case 'cssBundler':
+      const folderPath = pUtils.resolveFolderPath(__dirname, program.path);
+      require('./lib/css-bundler')(folderPath);
+      break;
+    default:
+      console.error('Wrong input parameters!')
+      program.help();
+      break;
+  }
+} catch (error) {
+  console.error('Something went wrong!')
+  console.error(`Error: ${error.message || error}`);
+}

hw3/utils/users.csv

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+user_id,first_name,last_name,timestamp
+4a5a0930-faac-11e7-8c3f-9a214cf093ae,John,Snow,2017-01-23 03:00:00+03
+510c3e42-faac-11e7-8c3f-9a214cf093ae,Sam,Smith,2017-01-23 03:00:00+04

hw3/utils/users.txt

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+Bob
+Jack
+Bill

hw4/.babelrc

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+{
+  "presets": ["env"]
+}