56 lines
2.4 KiB
JavaScript
56 lines
2.4 KiB
JavaScript
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// Patch an emscripten glue `<app>.js` so the runtime `ENV` merges `Module.ENV`.
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//
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// Why: emscripten's generated glue does `var ENV = {};` and (in this toolchain)
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// never merges the caller's `Module.ENV`, so setting `Module.ENV` from JS is a
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// silent no-op. The standalone's boot.ts uses `Module.ENV.KICAD_TRACE` to drive
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// the `?trace=` profiling harness. Crucially, `_environ_get` on a pthread PROXIES
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// TO THE MAIN THREAD, so `getenv()` on the app pthread reads the MAIN thread's
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// `ENV` via `getEnvStrings()` — which stays empty without this merge. Result:
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// `KICAD_TRACE` never reaches `TRACE_MANAGER`, and every `KI_TRACE(...)` is a
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// silent no-op. Merging `Module.ENV` makes `?trace=` (and any future Module.ENV
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// use) actually work. Safe no-op when `Module.ENV` is unset (normal boots).
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//
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// This replaces a fragile manual edit that had to be re-applied to the generated
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// glue after every build (docs/features/libs/0013). Idempotent; run per app in
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// the build's host post-process. Usage: node patch-env-shim.mjs <file.js> [...]
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import { readFileSync, writeFileSync } from "node:fs";
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// Guard on `typeof Module` (glue-local on main; undefined in some worker realms —
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// harmless there, since environ_get proxies to main anyway). Marker keeps it
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// idempotent and lets the region-replace below re-normalize a prior insert.
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const SHIM =
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'try { if (typeof Module !== "undefined" && Module && Module.ENV)' +
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" for (var _k in Module.ENV) ENV[_k] = Module.ENV[_k]; }" +
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" catch (e) {} /*PCBJAM_ENV_SHIM*/";
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// Match `var ENV = {};` plus whatever sits between it and the next glue function
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// (`var getExecutableName`), so re-running normalizes an earlier insert instead
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// of stacking. The `getExecutableName` anchor is stable across emscripten builds.
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const REGION = /var ENV = \{\};[\s\S]*?\n(?=var getExecutableName)/;
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let failed = 0;
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for (const file of process.argv.slice(2)) {
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let src;
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try {
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src = readFileSync(file, "utf8");
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} catch (e) {
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console.error(`[env-shim] cannot read ${file}: ${e.message}`);
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failed++;
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continue;
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}
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if (!REGION.test(src)) {
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console.error(`[env-shim] no \`var ENV = {};\` anchor in ${file} — skipped`);
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failed++;
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continue;
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}
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const patched = src.replace(REGION, `var ENV = {};\n${SHIM}\n\n`);
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if (patched === src) {
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console.log(`[env-shim] ${file} already current`);
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continue;
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}
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writeFileSync(file, patched);
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console.log(`[env-shim] patched ${file}`);
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}
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process.exit(failed ? 1 : 0);
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