Speed up IDE startup time.

Signed-off-by: Akos Kitta <a.kitta@arduino.cc>

arduino-ide-extension/scripts/download-examples.js

@@ -4,30 +4,93 @@
 const version = '1.9.1';
 
 (async () => {
+  const os = require('os');
+  const { promises: fs } = require('fs');
+  const path = require('path');
+  const shell = require('shelljs');
+  const { v4 } = require('uuid');
 
-    const os = require('os');
-    const path = require('path');
-    const shell = require('shelljs');
-    const { v4 } = require('uuid');
+  const repository = path.join(os.tmpdir(), `${v4()}-arduino-examples`);
+  if (shell.mkdir('-p', repository).code !== 0) {
+    shell.exit(1);
+  }
 
-    const repository = path.join(os.tmpdir(), `${v4()}-arduino-examples`);
-    if (shell.mkdir('-p', repository).code !== 0) {
-        shell.exit(1);
-        process.exit(1);
+  if (
+    shell.exec(
+      `git clone https://github.com/arduino/arduino-examples.git ${repository}`
+    ).code !== 0
+  ) {
+    shell.exit(1);
+  }
+
+  if (
+    shell.exec(`git -C ${repository} checkout tags/${version} -b ${version}`)
+      .code !== 0
+  ) {
+    shell.exit(1);
+  }
+
+  const destination = path.join(__dirname, '..', 'Examples');
+  shell.mkdir('-p', destination);
+  shell.cp('-fR', path.join(repository, 'examples', '*'), destination);
+
+  const isSketch = async (pathLike) => {
+    try {
+      const names = await fs.readdir(pathLike);
+      const dirName = path.basename(pathLike);
+      return names.indexOf(`${dirName}.ino`) !== -1;
+    } catch (e) {
+      if (e.code === 'ENOTDIR') {
+        return false;
+      }
+      throw e;
     }
-
-    if (shell.exec(`git clone https://github.com/arduino/arduino-examples.git ${repository}`).code !== 0) {
-        shell.exit(1);
-        process.exit(1);
+  };
+  const examples = [];
+  const categories = await fs.readdir(destination);
+  const visit = async (pathLike, container) => {
+    const stat = await fs.lstat(pathLike);
+    if (stat.isDirectory()) {
+      if (await isSketch(pathLike)) {
+        container.sketches.push({
+          name: path.basename(pathLike),
+          relativePath: path.relative(destination, pathLike),
+        });
+      } else {
+        const names = await fs.readdir(pathLike);
+        for (const name of names) {
+          const childPath = path.join(pathLike, name);
+          if (await isSketch(childPath)) {
+            container.sketches.push({
+              name,
+              relativePath: path.relative(destination, childPath),
+            });
+          } else {
+            const child = {
+              label: name,
+              children: [],
+              sketches: [],
+            };
+            container.children.push(child);
+            await visit(childPath, child);
+          }
+        }
+      }
     }
-
-    if (shell.exec(`git -C ${repository} checkout tags/${version} -b ${version}`).code !== 0) {
-        shell.exit(1);
-        process.exit(1);
-    }
-
-    const destination = path.join(__dirname, '..', 'Examples');
-    shell.mkdir('-p', destination);
-    shell.cp('-fR', path.join(repository, 'examples', '*'), destination);
-
+  };
+  for (const category of categories) {
+    const example = {
+      label: category,
+      children: [],
+      sketches: [],
+    };
+    await visit(path.join(destination, category), example);
+    examples.push(example);
+  }
+  await fs.writeFile(
+    path.join(destination, 'examples.json'),
+    JSON.stringify(examples, null, 2),
+    { encoding: 'utf8' }
+  );
+  shell.echo(`Generated output to ${path.join(destination, 'examples.json')}`);
 })();