feat: add electron app support

electron/scripts/generate-macos-icon.js

@@ -0,0 +1,62 @@
+import fs from 'node:fs/promises';
+import sharp from 'sharp';
+
+const size = 1024;
+const assetsDir = 'electron/assets';
+const iconPath = 'electron/assets/logo-macos.png';
+const icnsPath = 'electron/assets/logo-macos.icns';
+
+function renderSvg(entrySize) {
+  const scale = entrySize / 32;
+  return `
+<svg xmlns="http://www.w3.org/2000/svg" width="${entrySize}" height="${entrySize}" viewBox="0 0 ${entrySize} ${entrySize}">
+  <rect width="${entrySize}" height="${entrySize}" fill="#2563eb"/>
+  <path
+    d="M${8 * scale} ${9 * scale}C${8 * scale} ${8.44772 * scale} ${8.44772 * scale} ${8 * scale} ${9 * scale} ${8 * scale}H${23 * scale}C${23.5523 * scale} ${8 * scale} ${24 * scale} ${8.44772 * scale} ${24 * scale} ${9 * scale}V${18 * scale}C${24 * scale} ${18.5523 * scale} ${23.5523 * scale} ${19 * scale} ${23 * scale} ${19 * scale}H${12 * scale}L${8 * scale} ${23 * scale}V${9 * scale}Z"
+    stroke="white"
+    stroke-width="${2 * scale}"
+    stroke-linecap="round"
+    stroke-linejoin="round"
+    fill="none"
+  />
+</svg>`;
+}
+
+async function renderPng(entrySize) {
+  return sharp(Buffer.from(renderSvg(entrySize)))
+    .png()
+    .toBuffer();
+}
+
+await fs.mkdir(assetsDir, { recursive: true });
+await fs.writeFile(iconPath, await renderPng(size));
+
+const icnsEntries = [
+  ['icp4', 16],
+  ['icp5', 32],
+  ['icp6', 64],
+  ['ic07', 128],
+  ['ic08', 256],
+  ['ic09', 512],
+  ['ic10', 1024],
+  ['ic11', 32],
+  ['ic12', 64],
+  ['ic13', 256],
+  ['ic14', 512],
+];
+
+const blocks = await Promise.all(icnsEntries.map(async ([type, entrySize]) => {
+  const png = await renderPng(entrySize);
+  const block = Buffer.alloc(8 + png.length);
+  block.write(type, 0, 4, 'ascii');
+  block.writeUInt32BE(block.length, 4);
+  png.copy(block, 8);
+  return block;
+}));
+
+const totalLength = 8 + blocks.reduce((sum, block) => sum + block.length, 0);
+const header = Buffer.alloc(8);
+header.write('icns', 0, 4, 'ascii');
+header.writeUInt32BE(totalLength, 4);
+
+await fs.writeFile(icnsPath, Buffer.concat([header, ...blocks], totalLength));