build: create app protocol

- add a build script (wip not yet packaged)

build/scripts/build.mjs

@@ -0,0 +1,79 @@
+import vue from '@vitejs/plugin-vue';
+import esbuild from 'esbuild';
+import { $ } from 'execa';
+import fs from 'fs-extra';
+import path from 'path';
+import { fileURLToPath } from 'url';
+import * as vite from 'vite';
+import { getMainProcessCommonConfig } from './helpers.mjs';
+
+const dirname = path.dirname(fileURLToPath(import.meta.url));
+const root = path.join(dirname, '..', '..');
+
+const $$ = $({ stdio: 'inherit' });
+await $$`rm -rf ${path.join(root, 'dist_electron', 'build')}`;
+
+await buildMainProcessSource();
+await buildRendererProcessSource();
+
+async function buildMainProcessSource() {
+  const commonConfig = getMainProcessCommonConfig(root);
+  const result = await esbuild.build({
+    ...commonConfig,
+    outfile: path.join(root, 'dist_electron', 'build', 'main.js'),
+  });
+
+  if (result.errors.length) {
+    console.error('app build failed due to main process source build');
+    result.errors.forEach((err) => console.error(err));
+    process.exit(1);
+  }
+}
+
+async function buildRendererProcessSource() {
+  const base = 'app://';
+  const outDir = path.join(root, 'dist_electron', 'build', 'src');
+  await vite.build({
+    base: `/${base}`,
+    root: path.join(root, 'src'),
+    build: { outDir },
+    plugins: [vue()],
+    resolve: {
+      alias: {
+        vue: 'vue/dist/vue.esm-bundler.js',
+        fyo: path.join(root, 'fyo'),
+        src: path.join(root, 'src'),
+        schemas: path.join(root, 'schemas'),
+        backend: path.join(root, 'backend'),
+        models: path.join(root, 'models'),
+        utils: path.join(root, 'utils'),
+        regional: path.join(root, 'regional'),
+        reports: path.join(root, 'reports'),
+        dummy: path.join(root, 'dummy'),
+        fixtures: path.join(root, 'fixtures'),
+      },
+    },
+  });
+  removeBaseLeadingSlash(outDir, base);
+}
+
+/**
+ * Removes leading slash from all renderer files
+ * electron uses a custom registered protocol to load the
+ * files: "app://"
+ *
+ * @param {string} dir
+ * @param {string} base
+ */
+function removeBaseLeadingSlash(dir, base) {
+  for (const file of fs.readdirSync(dir)) {
+    const filePath = path.join(dir, file);
+    if (fs.lstatSync(filePath).isDirectory()) {
+      removeBaseLeadingSlash(filePath, base);
+      continue;
+    }
+
+    const contents = fs.readFileSync(filePath).toString('utf-8');
+    fs.writeFileSync(filePath, contents.replaceAll('/' + base, base));
+  }
+}

build/scripts/dev.mjs

@@ -3,7 +3,7 @@ import esbuild from 'esbuild';
 import { $ } from 'execa';
 import path from 'path';
 import { fileURLToPath } from 'url';
-import { excludeVendorFromSourceMap } from './plugins.mjs';
+import { getMainProcessCommonConfig } from './helpers.mjs';
 
 process.env['ELECTRON_DISABLE_SECURITY_WARNINGS'] = 'true';
 process.env['NODE_ENV'] = 'development';
@@ -45,16 +45,8 @@ if (!process.argv.includes('--no-renderer')) {
  * to [re]build the main process code
  */
 const ctx = await esbuild.context({
-  entryPoints: [path.join(root, 'main.ts')],
+  ...getMainProcessCommonConfig(root),
-  bundle: true,
+  outfile: path.join(root, 'dist_electron', 'dev', 'main.js'),
-  sourcemap: true,
-  sourcesContent: false,
-  platform: 'node',
-  target: 'node16',
-  outfile: path.join(root, 'dist', 'dev', 'main.js'),
-  external: ['knex', 'electron', 'better-sqlite3'],
-  plugins: [excludeVendorFromSourceMap],
-  write: true,
 });
 
 /**
@@ -135,7 +127,7 @@ async function handleResult(result) {
 function runElectron() {
   const electronProcess = $$`npx electron --inspect=5858 ${path.join(
     root,
-    'dist',
+    'dist_electron',
     'dev',
     'main.js'
   )}`;

build/scripts/helpers.mjs

@@ -0,0 +1,51 @@
+import fs from 'fs';
+import path from 'path';
+
+/**
+ * Common ESBuild config used for building main process source
+ * code for both dev and production.
+ * 
+ * @param {string} root
+ * @returns {import('esbuild').BuildOptions}
+ */
+export function getMainProcessCommonConfig(root) {
+  return {
+    entryPoints: [path.join(root, 'main.ts')],
+    bundle: true,
+    sourcemap: true,
+    sourcesContent: false,
+    platform: 'node',
+    target: 'node16',
+    external: ['knex', 'electron', 'better-sqlite3'],
+    plugins: [excludeVendorFromSourceMap],
+    write: true,
+  };
+}
+
+/**
+ * ESBuild plugin used to prevent source maps from being generated for
+ * packages inside node_modules, only first-party code source maps
+ * are to be included.
+ * 
+ * Note, this is used only for the main process source code.
+ * 
+ * source: https://github.com/evanw/esbuild/issues/1685#issuecomment-944916409
+ * @type {import('esbuild').Plugin}
+ */
+export const excludeVendorFromSourceMap = {
+  name: 'excludeVendorFromSourceMap',
+  setup(build) {
+    build.onLoad({ filter: /node_modules/ }, (args) => {
+      if (args.path.endsWith('.json')) {
+        return;
+      }
+
+      return {
+        contents:
+          fs.readFileSync(args.path, 'utf8') +
+          '\n//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbIiJdLCJtYXBwaW5ncyI6IkEifQ==',
+        loader: 'default',
+      };
+    });
+  },
+};

build/scripts/plugins.mjs

@@ -1,23 +0,0 @@
-import fs from 'fs';
-
-/**
- * source: https://github.com/evanw/esbuild/issues/1685#issuecomment-944916409
- * @type {import('esbuild').Plugin}
- */
-export const excludeVendorFromSourceMap = {
-  name: 'excludeVendorFromSourceMap',
-  setup(build) {
-    build.onLoad({ filter: /node_modules/ }, (args) => {
-      if (args.path.endsWith('.json')) {
-        return;
-      }
-
-      return {
-        contents:
-          fs.readFileSync(args.path, 'utf8') +
-          '\n//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbIiJdLCJtYXBwaW5ncyI6IkEifQ==',
-        loader: 'default',
-      };
-    });
-  },
-};

main.ts

@@ -8,9 +8,12 @@ import {
   BrowserWindow,
   BrowserWindowConstructorOptions,
   protocol,
+  ProtocolRequest,
+  ProtocolResponse,
 } from 'electron';
 import Store from 'electron-store';
 import { autoUpdater } from 'electron-updater';
+import fs from 'fs';
 import path from 'path';
 import registerAppLifecycleListeners from './main/registerAppLifecycleListeners';
 import registerAutoUpdaterListeners from './main/registerAutoUpdaterListeners';
@@ -122,15 +125,20 @@ export class Main {
     this.mainWindow = new BrowserWindow(options);
 
     if (this.isDevelopment) {
-      this.loadDevServerURL();
+      this.setViteServerURL();
     } else {
-      this.loadAppUrl();
+      this.registerAppProtocol();
+    }
+
+    this.mainWindow!.loadURL(this.winURL);
+    if (this.isDevelopment && !this.isTest) {
+      this.mainWindow!.webContents.openDevTools();
     }
 
     this.setMainWindowListeners();
   }
 
-  loadDevServerURL() {
+  setViteServerURL() {
     let port = 6969;
     let host = '0.0.0.0';
 
@@ -141,18 +149,13 @@ export class Main {
 
     // Load the url of the dev server if in development mode
     this.winURL = `http://${host}:${port}/`;
-    this.mainWindow!.loadURL(this.winURL);
-
-    if (this.isDevelopment && !this.isTest) {
-      this.mainWindow!.webContents.openDevTools();
-    }
   }
 
-  loadAppUrl() {
+  registerAppProtocol() {
-    // createProtocol('app');
+    protocol.registerBufferProtocol('app', bufferProtocolCallback);
-    // Load the index.html when not in development
+
-    // this.winURL = 'app://./index.html';
+    // Use the registered protocol url to load the files.
-    // this.mainWindow!.loadURL(this.winURL);
+    this.winURL = 'app://./index.html';
   }
 
   setMainWindowListeners() {
@@ -170,4 +173,36 @@ export class Main {
   }
 }
 
+/**
+ * Callback used to register the custom app protocol,
+ * during prod, files are read and served by using this
+ * protocol.
+ */
+function bufferProtocolCallback(
+  request: ProtocolRequest,
+  callback: (response: ProtocolResponse) => void
+) {
+  const { pathname, host } = new URL(request.url);
+  const filePath = path.join(
+    __dirname,
+    'src',
+    decodeURI(host),
+    decodeURI(pathname)
+  );
+
+  fs.readFile(filePath, (_, data) => {
+    const extension = path.extname(filePath).toLowerCase();
+    const mimeType =
+      {
+        '.js': 'text/javascript',
+        '.css': 'text/css',
+        '.html': 'text/html',
+        '.svg': 'image/svg+xml',
+        '.json': 'application/json',
+      }[extension] ?? '';
+
+    callback({ mimeType, data });
+  });
+}
+
 export default new Main();

main/getPrintTemplates.ts

@@ -29,7 +29,7 @@ async function getPrintTemplatePaths(): Promise<{
     const files = await fs.readdir(root);
     return { files, root };
   } catch {
-    root = path.join(__dirname, `../templates`);
+    root = path.join(__dirname, '..', '..', `templates`);
   }
 
   try {

package.json

@@ -8,15 +8,13 @@
   },
   "scripts": {
     "dev": "node build/scripts/dev.mjs",
+    "build": "node build/scripts/build.mjs",
     "dev:main": "node build/scripts/dev.mjs --no-renderer",
     "dev:renderer": "yarn vite",
-    "build": "vue-cli-service build",
     "lint": "vue-cli-service lint",
     "release": "scripts/publish-mac-arm.sh",
     "postinstall": "electron-rebuild",
     "postuninstall": "electron-rebuild",
-    "electron:build": "vue-cli-service electron:build",
-    "electron:serve": "vue-cli-service electron:serve",
     "script:translate": "scripts/runner.sh scripts/generateTranslations.ts",
     "script:profile": "scripts/profile.sh",
     "test": "scripts/test.sh"
@@ -73,6 +71,7 @@
     "eslint-plugin-prettier": "^4.0.0",
     "eslint-plugin-vue": "^7.0.0",
     "execa": "^7.1.1",
+    "fs-extra": "^11.1.1",
     "lint-staged": "^11.2.6",
     "postcss": "^8",
     "prettier": "^2.4.1",

public/index.html

@@ -1,16 +0,0 @@
-<!DOCTYPE html>
-<html lang="en">
-  <head>
-    <meta charset="utf-8">
-    <meta http-equiv="X-UA-Compatible" content="IE=edge">
-    <meta name="viewport" content="width=device-width,initial-scale=1.0">
-    <link rel="icon" href="<%= BASE_URL %>favicon.ico">
-    <title>Frappe Books</title>
-  </head>
-  <body>
-    <noscript>
-      <strong>We're sorry but Frappe Books doesn't work properly without JavaScript enabled. Please enable it to continue.</strong>
-    </noscript>
-    <!-- built files will replace body.innerHTML -->
-  </body>
-</html>

vite.config.ts

@@ -2,11 +2,15 @@ import vue from '@vitejs/plugin-vue';
 import path from 'path';
 import { defineConfig } from 'vite';
 
-/**
- * This is a work in progress vite config. Currently only dev works.
- */
 
-// https://vitejs.dev/config/
+/**
+ * This vite config file is used only for dev mode, i.e.
+ * to create a serve build modules of the source code
+ * which will be rendered by electron.
+ * 
+ * For building the project, vite is used programmatically
+ * see build/scripts/build.mjs for this.
+ */
 export default () => {
   let port = 6969;
   let host = '0.0.0.0';

yarn.lock

@@ -6534,6 +6534,15 @@ fs-extra@^10.1.0:
     jsonfile "^6.0.1"
     universalify "^2.0.0"
 
+fs-extra@^11.1.1:
+  version "11.1.1"
+  resolved "https://registry.yarnpkg.com/fs-extra/-/fs-extra-11.1.1.tgz#da69f7c39f3b002378b0954bb6ae7efdc0876e2d"
+  integrity sha512-MGIE4HOvQCeUCzmlHs0vXpih4ysz4wg9qiSAu6cd42lVwPbTM1TjV7RusoyQqMmk/95gdQZX72u+YW+c3eEpFQ==
+  dependencies:
+    graceful-fs "^4.2.0"
+    jsonfile "^6.0.1"
+    universalify "^2.0.0"
+
 fs-extra@^7.0.1:
   version "7.0.1"
   resolved "https://registry.yarnpkg.com/fs-extra/-/fs-extra-7.0.1.tgz#4f189c44aa123b895f722804f55ea23eadc348e9"