Save mandatory env variables to .env file

scripts/config.js

@@ -1,8 +1,70 @@
+const inquirer = require('inquirer');
 const fs = require('fs');
+const readline = require('readline');
 const chalk = require('chalk');
 
+const mandatoryVariables = [
+  {
+    type: 'input',
+    name: 'REACT_APP_SHARETRIBE_SDK_CLIENT_ID',
+    message: `What is your Flex client id?`,
+  },
+  {
+    type: 'input',
+    name: 'REACT_APP_STRIPE_PUBLISHABLE_KEY',
+    message: `What is your Stripe publishable key?`,
+  },
+  {
+    type: 'input',
+    name: 'REACT_APP_MAPBOX_ACCESS_TOKEN',
+    message: `What is your Mapbox access token?`,
+  },
+];
 
 
+const updateEnvFile = data => {
+  let content = '';
+  data.map(line => {
+    content = content + line.toString();
+  });
+
+  fs.writeFileSync('./.env', content);
+};
+
+const checkIfSameLine = (answers, line) => {
+  let foundKey;
+  if (answers) {
+    Object.keys(answers).map(key => {
+      if (line.includes(key)) {
+        foundKey = key;
+      }
+    });
+  }
+  return foundKey;
+};
+
+const readLines = answers => {
+  return new Promise((resolve, reject) => {
+    const rl = readline.createInterface({
+      input: require('fs').createReadStream('./.env')
+    });
+    
+    const data = [];
+    rl.on('line', function (line) {
+      const key = checkIfSameLine(answers, line);
+      if (key) {
+        data.push(`${key}=${answers[key]}\n`);
+      } else {
+        data.push(`${line}\n`);
+      }
+    });
+    
+    rl.on('close', () => {
+      resolve(data);
+    });
+  });
+};
+
 const createEnvFile = () => {
   fs.copyFileSync('./.env-template', './.env', err => {
     if (err) throw err;
@@ -21,6 +83,18 @@ if (fs.existsSync(`./.env`)) {
 
     createEnvFile();
 
+    console.log(chalk.bold('Mandatory variables'));
+    inquirer
+      .prompt(mandatoryVariables)
+      .then(answers => {
+        return readLines(answers);
+      })
+      .then(data => {        
+        updateEnvFile(data);
+      })
+      .catch(err => {
+        console.log(chalk.red(`An error occurred due to: ${err.message}`));
+      });
   }
 };