Add download page logic

Author: thedoorbell

bin/page-loader.js

@@ -0,0 +1,17 @@
+#!/usr/bin/env node
+
+import { program } from 'commander'
+import downloadPage from '../src/index.js'
+
+program
+  .name('Page loader')
+  .description('Page loader utility.')
+  .version('1.0.0')
+  .arguments('<url>')
+  .option('-o, --output [dir]', 'output dir', process.cwd())
+  .action((url, options) => {
+    downloadPage(url, options.output)
+      .then(filePath => console.log(filePath))
+  })
+
+program.parse()

bin/pageloader.js

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+import axios from 'axios'
+
+const getPage = url => axios.get(url).then(response => response.data)
+
+export default getPage

src/getPage.js

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+import path from 'path'
+import fsp from 'fs/promises'
+import getPage from './getPage.js'
+
+const getAbsolutePath = dirpath => path.resolve(process.cwd(), dirpath)
+
+const generateFileName = (url) => {
+  const href = new URL(url)
+  return (href.hostname + href.pathname).replace(/[^a-zA-Z0-9]/g, '-') + '.html'
+}
+
+const downloadPage = (url, outputDir) => {
+  const fileName = generateFileName(url)
+  const filePath = path.join(getAbsolutePath(outputDir), fileName)
+
+  return getPage(url)
+    .then(pageData => fsp.writeFile(filePath, pageData)
+      .then(() => filePath))
+    .catch((err) => {
+      throw new Error(`Error: ${err.message}`)
+    })
+}
+
+export default downloadPage