マルチエンジン：VVPPに7zを使えるように

build/download7z.js

@@ -0,0 +1,83 @@
+const path = require("path");
+const fs = require("fs");
+const { spawnSync } = require("child_process");
+
+(async () => {
+  // node-fetchはESModuleなので、import()で読み込む
+  const { default: fetch } = await import("node-fetch");
+  const distPath = path.resolve(__dirname, "vendored", "7z");
+  let url;
+  let filesToExtract;
+  switch (process.platform) {
+    case "win32": {
+      const sevenzrUrl = "https://www.7-zip.org/a/7zr.exe";
+      const sevenzrPath = path.resolve(distPath, "7zr.exe");
+      if (!fs.existsSync(sevenzrPath)) {
+        console.log("Downloading 7zr from " + sevenzrUrl);
+        const res = await fetch(sevenzrUrl);
+        const buffer = await res.arrayBuffer();
+
+        await fs.promises.writeFile(sevenzrPath, Buffer.from(buffer));
+      }
+
+      url = "https://www.7-zip.org/a/7z2201-extra.7z";
+      // 7za.dll、7zxa.dllはなくても動くので、除外する
+      // filesToExtract = ["7za.exe", "7za.dll", "7zxa.dll", "License.txt"];
+      filesToExtract = ["7za.exe", "License.txt"];
+
+      break;
+    }
+    case "linux": {
+      url = "https://www.7-zip.org/a/7z2201-linux-x64.tar.xz";
+      filesToExtract = ["7zzs", "License.txt"];
+      break;
+    }
+    case "darwin": {
+      url = "https://www.7-zip.org/a/7z2107-mac.tar.xz";
+      filesToExtract = ["7zz", "License.txt"];
+      break;
+    }
+    default: {
+      throw new Error("Unsupported platform");
+    }
+  }
+
+  const existingFiles = await fs.promises.readdir(distPath);
+
+  const notDownloaded = filesToExtract.filter(
+    (file) => !existingFiles.includes(file)
+  );
+
+  if (notDownloaded.length === 0) {
+    console.log("7z already downloaded");
+    return;
+  }
+
+  console.log("Downloading 7z from " + url);
+  const res = await fetch(url);
+  const buffer = await res.arrayBuffer();
+  const sevenZipPath = path.resolve(distPath, path.basename(url));
+  await fs.promises.writeFile(sevenZipPath, Buffer.from(buffer));
+
+  console.log("Extracting 7z");
+  const extractor = url.endsWith(".7z")
+    ? spawnSync(
+        path.resolve(distPath, "7zr.exe"),
+        ["x", "-y", "-o" + distPath, sevenZipPath, ...filesToExtract],
+        {
+          stdio: ["ignore", "inherit", "inherit"],
+        }
+      )
+    : spawnSync(
+        "tar",
+        ["xvf", sevenZipPath, "-v", "-C", distPath, ...filesToExtract],
+        {
+          stdio: ["ignore", "inherit", "inherit"],
+        }
+      );
+
+  if (extractor.status !== 0) {
+    console.error("Failed to extract 7z");
+    process.exit(1);
+  }
+})();

build/generateLicenses.js

@@ -3,6 +3,7 @@
 const process = require("process");
 const { execFileSync } = require("child_process");
 const fs = require("fs");
+const path = require("path");
 const yargs = require("yargs/yargs");
 const { hideBin } = require("yargs/helpers");
 const argv = yargs(hideBin(process.argv))
@@ -57,12 +58,40 @@ const licenseJson = execFileSync(
 
 const checkerLicenses = JSON.parse(licenseJson);
 
-const licenses = Object.entries(checkerLicenses).map(([, license]) => ({
-  name: license.name,
-  version: license.version,
-  license: license.licenses,
-  text: license.licenseText,
-}));
+const externalLicenses = [];
+
+externalLicenses.push({
+  name: "7-Zip",
+  version: execFileSync(
+    path.join(
+      __dirname,
+      "vendored",
+      "7z",
+      {
+        win32: "7za.exe",
+        linux: "7zzs",
+        darwin: "7zz",
+      }[process.platform]
+    ),
+
+    {
+      encoding: "utf-8",
+    }
+  ).match(/7-Zip\s+(?:\(.\))?\s*([0-9.]+)/)[1],
+  license: "LGPL-2.1",
+  text: fs.readFileSync(path.join(__dirname, "vendored", "7z", "License.txt"), {
+    encoding: "utf-8",
+  }),
+});
+
+const licenses = Object.entries(checkerLicenses)
+  .map(([, license]) => ({
+    name: license.name,
+    version: license.version,
+    license: license.licenses,
+    text: license.licenseText,
+  }))
+  .concat(externalLicenses);
 
 const outputPath = argv.output_path;
 fs.writeFileSync(outputPath, JSON.stringify(licenses));

build/vendored/.gitignore

@@ -0,0 +1,4 @@
+*
+!README.md
+!.gitignore
+!*/.gitkeep

build/vendored/README.md

@@ -0,0 +1,7 @@
+# build/vendored
+
+このディレクトリはダウンロードしたファイルを格納するためのものです。
+
+| ディレクトリ名 | 内容                           | ダウンローダー        |
+| -------------- | ------------------------------ | --------------------- |
+| `7z`           | [7-Zip](http://www.7-zip.org/) | `build/download7z.js` |

electron-builder.config.js

@@ -24,6 +24,19 @@ const isMac = process.platform === "darwin";
 // cf: https://k-hyoda.hatenablog.com/entry/2021/10/23/000349#%E8%BF%BD%E5%8A%A0%E5%B1%95%E9%96%8B%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB%E5%85%88%E3%81%AE%E8%A8%AD%E5%AE%9A
 const extraFilePrefix = isMac ? "MacOS/" : "";
 
+/** @type {import("electron-builder").FileSet[]} */
+let sevenZipFiles = [];
+sevenZipFiles = fs
+  .readdirSync(path.resolve(__dirname, "build", "vendored", "7z"))
+  .filter(
+    // 拡張子なし（Linux/Macバイナリ）と7za.exeのみを埋め込み
+    (fileName) => !fileName.includes(".") || fileName === "7za.exe"
+  )
+  .map((fileName) => ({
+    from: path.resolve(__dirname, "build", "vendored", "7z", fileName),
+    to: extraFilePrefix + fileName,
+  }));
+
 /** @type {import("electron-builder").Configuration} */
 const builderOptions = {
   beforeBuild: async () => {
@@ -72,6 +85,7 @@ const builderOptions = {
       from: VOICEVOX_ENGINE_DIR,
       to: extraFilePrefix,
     },
+    ...sevenZipFiles,
   ],
   // electron-builder installer
   productName: "VOICEVOX",