integrated Downlod CLI option

.gitignore

@@ -4,3 +4,4 @@ node_modules
 package-lock.json
 index.js
 *.tgz
+pdfs

bin/duh-bus.js

@@ -1,9 +1,25 @@
 #!/usr/bin/env node
 'use strict';
 
+const process = require('process');
 const path = require('path');
+const { program } = require('commander');
+const dl = require('../lib/amba-pdf-dl.js');
 
-const specPath = path.resolve(__dirname, '../specs');
+const main = async () => {
+  program
+    .option('--amba-pdf-dl <folder>', 'download AMBA spec PDFs')
+    .parse(process.argv);
+
+  const opts = program.opts();
+  if (opts.ambaPdfDl) {
+    await dl(opts.ambaPdfDl);
+    return;
+  }
+  const specPath = path.resolve(__dirname, '../specs');
+  console.log(specPath);
+};
+
+main();
 
-console.log(specPath);
 /* eslint no-console:0 */

lib/amba-pdf-dl.js

@@ -0,0 +1,38 @@
+'use strict';
+
+const { createWriteStream, existsSync } = require('fs');
+const { mkdir } = require("fs/promises");
+const path = require('path');
+const { Readable } = require('stream');
+const { finished } = require('stream/promises');
+
+const specs = require('./amba-specs.js');
+
+const dl = async (ambaSpecsDl) => {
+  const dlFolderPath = path.resolve('.', ambaSpecsDl);
+  if (!existsSync(dlFolderPath)) {
+    await mkdir(dlFolderPath);
+  }
+  for (const spec of specs) {
+    const url = `https://documentation-service.arm.com/static/${spec.id}?token=`;
+    const res = await fetch(url);
+    const headers = res.headers.entries();
+    let fileName;
+    for (const [key, val] of headers) {
+      if (key === 'content-disposition') {
+        const m = val.match(/^attachment; filename=(?<baseName>[\w_-]+).pdf$/);
+        fileName = m.groups.baseName + '.pdf';
+      }
+    }
+    const fullFileName = path.resolve('.', dlFolderPath, fileName);
+    if (!existsSync(fullFileName)) {
+      const fileStream = createWriteStream(fullFileName, { flags: 'wx'});
+      await finished(Readable.fromWeb(res.body).pipe(fileStream));
+      console.log(fileName + ' - downloded');
+    } else {
+      console.log(fileName + ' - exists');
+    }
+  }
+};
+
+module.exports = dl;

package.json

@@ -41,6 +41,7 @@
     "nyc": "^15.1.0"
   },
   "dependencies": {
+    "commander": "^12.1.0",
     "json5": "^2.2.3"
   }
 }