chore(scripts): fix electron rebuild failing due to Python on NixOS

scripts/electron-rebuild.mts

@@ -1,11 +1,27 @@
 import { join, resolve } from "path";
-import { cpSync, exists, existsSync, mkdirSync, readFileSync, rmSync } from "fs";
+import { cpSync, existsSync, mkdirSync, readFileSync, rmSync } from "fs";
 import { execSync } from "child_process";
 import { rebuild } from "@electron/rebuild"
-import { getElectronPath, isNixOS } from "./utils.mjs";
+import { isNixOS } from "./utils.mjs";
 
 const workspaceRoot = join(import.meta.dirname, "..");
 
+// On NixOS, re-execute this script inside `nix develop` to get access to Python and other build tools
+if (isNixOS() && !process.env.IN_NIX_SHELL) {
+    console.log("Detected NixOS, re-running electron-rebuild inside 'nix develop'...");
+    try {
+        execSync("nix develop -c pnpm exec tsx scripts/electron-rebuild.mts", {
+            cwd: workspaceRoot,
+            stdio: "inherit",
+            env: { ...process.env, IN_NIX_SHELL: "1" }
+        });
+        process.exit(0);
+    } catch (e) {
+        console.error("Failed to run electron-rebuild inside 'nix develop'.");
+        process.exit(1);
+    }
+}
+
 function copyNativeDependencies(projectRoot: string) {
     const destPath = join(projectRoot, "node_modules/better-sqlite3");
     
@@ -46,20 +62,8 @@ async function rebuildNativeDependencies(projectRoot: string) {
 
 function determineElectronVersion(projectRoot: string) {
     const packageJson = JSON.parse(readFileSync(join(projectRoot, "package.json"), "utf-8"));
-
-    if (isNixOS()) {
-        console.log("Detected NixOS, reading Electron version from PATH");
-
-        try {
-            return execSync(`${getElectronPath()} --version`, { }).toString("utf-8");
-        } catch (e) {
-            console.error("Got error while trying to read the Electron version from shell. Make sure that an Electron version is in the PATH (e.g. `nix-shell -p electron`)");
-            process.exit(1);
-        }
-    } else {
-        console.log("Using Electron version from package.json");
-        return packageJson.devDependencies.electron;
-    }
+    console.log("Using Electron version from package.json");
+    return packageJson.devDependencies.electron;
 }
 
 for (const projectRoot of [ "apps/desktop", "apps/edit-docs" ]) {