feat(cli): Add createBackup method (#157)

This will be called once the `alacritty-themes` command gets executed.

Related #131

bin/cli.js

@@ -5,7 +5,7 @@ const path = require('path');
 const prompts = require('prompts');
 const temp = require('temp').track();
 
-const { themesFolder } = require('../src/helpers');
+const { createBackup, themesFolder } = require('../src/helpers');
 
 const {
   applyTheme,
@@ -17,6 +17,7 @@ const {
 let themes = fs.readdirSync(themesFolder()).map((f) => f.replace('.yml', ''));
 
 function main() {
+  createBackup();
   const argumentsExist = process.argv.length > 2;
   const isAltThemesFolder =
     process.argv.includes('--directory') || process.argv.includes('-d');

package.json

@@ -64,6 +64,10 @@
             {
               "type": "refactor",
               "release": "patch"
+            },
+            {
+              "type": "feat",
+              "release": "patch"
             }
           ],
           "parserOpts": {

src/helpers/index.js

@@ -1,4 +1,5 @@
 const fs = require('fs');
+const fsPromises = fs.promises;
 const path = require('path');
 const settings = require('../../settings');
 
@@ -8,6 +9,23 @@ const NoAlacrittyFileFoundError = new Error(
     '\nOr you can create a new one using `alacritty-themes --create`'
 );
 
+function createBackup() {
+  if (!alacrittyFileExists()) {
+    return;
+  }
+
+  const backupFile = `${pathToAlacrittyFile()}alacritty.yml.${Date.now()}.bak`;
+
+  fsPromises
+    .copyFile(alacrittyFile(), backupFile)
+    .then(() => {
+      console.log(`Automatic backup file was created: ${backupFile}`);
+    })
+    .catch((err) => {
+      if (err) throw err;
+    });
+}
+
 function rootDirectory() {
   return settings.PROJECT_DIR;
 }
@@ -36,6 +54,10 @@ function archHome() {
   return process.env.XDG_CONFIG_HOME;
 }
 
+function alacrittyFile() {
+  return `${pathToAlacrittyFile()}alacritty.yml`;
+}
+
 function pathToAlacrittyFile() {
   return isWindows()
     ? pathToAlacrittyFileOnWindows()
@@ -100,6 +122,7 @@ module.exports = {
   alacrittyFileExists,
   alacrittyTemplatePath,
   archHome,
+  createBackup,
   isWindows,
   linuxHome,
   pathToAlacrittyFile,