From 7c3b1c6e249bb56e9e86ac79db7d229835ca1840 Mon Sep 17 00:00:00 2001
From: David Montero Crespo <davidmonterocrespo24@gmail.com>
Date: Sat, 15 Aug 2026 06:44:35 +0200
Subject: [PATCH] =?UTF-8?q?feat(editor):=20compile-diagnostics=20seam=20?=
 =?UTF-8?q?=E2=80=94=20publish=20raw=20build=20output=20for=20editor=20mar?=
 =?UTF-8?q?kers?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../src/components/editor/EditorToolbar.tsx   |  8 +++++++
 frontend/src/lib/intellisenseRegistry.ts      | 24 +++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/frontend/src/components/editor/EditorToolbar.tsx b/frontend/src/components/editor/EditorToolbar.tsx
index 5d9344d7..f7a0c888 100644
--- a/frontend/src/components/editor/EditorToolbar.tsx
+++ b/frontend/src/components/editor/EditorToolbar.tsx
@@ -1,6 +1,7 @@
 import { useState, useCallback, useRef, useEffect } from 'react';
 import { useTranslation } from 'react-i18next';
 import { registerEditorCommand } from '../../lib/editorCommands';
+import { publishCompileOutput } from '../../lib/intellisenseRegistry';
 import { useEditorStore, chipFileGroupId } from '../../store/useEditorStore';
 import { useSimulatorStore, piRerunScript } from '../../store/useSimulatorStore';
 import { decideEngine } from '../../lib/instantEngine';
@@ -594,6 +595,13 @@ export const EditorToolbar = ({
       const resultLogs = parseCompileResult(result, boardLabel, boardTarget, lastStreamedLen > 0);
       setCompileLogs((prev: CompilationLog[]) => [...prev, ...resultLogs]);
 
+      // Intellisense seam: hand the raw compiler text to the overlay so it
+      // can paint file:line markers in the editor. Empty string clears the
+      // markers after a successful build. No-op in OSS.
+      publishCompileOutput(
+        result.success ? '' : [result.stderr, result.error].filter(Boolean).join('\n'),
+      );
+
       if (result.success) {
         const program = result.hex_content ?? result.binary_content ?? null;
         if (program && activeBoardId) {
diff --git a/frontend/src/lib/intellisenseRegistry.ts b/frontend/src/lib/intellisenseRegistry.ts
index 5649916d..ef3f49f6 100644
--- a/frontend/src/lib/intellisenseRegistry.ts
+++ b/frontend/src/lib/intellisenseRegistry.ts
@@ -43,3 +43,27 @@ function run(impl: IntellisenseImpl, monaco: unknown): void {
     console.warn('[oss] intellisense impl threw:', err);
   }
 }
+
+/**
+ * Compile-diagnostics seam. The editor toolbar publishes the raw compiler
+ * output after every build (empty string on success, to clear); with the
+ * pro overlay loaded, its sink parses gcc/mpy positions out of the text
+ * and paints Monaco markers on the affected lines. Inert in OSS.
+ */
+
+type CompileOutputSink = (raw: string) => void;
+
+let _compileSink: CompileOutputSink | null = null;
+
+export function installCompileDiagnosticsSink(sink: CompileOutputSink | null): void {
+  _compileSink = sink;
+}
+
+export function publishCompileOutput(raw: string): void {
+  try {
+    _compileSink?.(raw);
+  } catch (err) {
+    // eslint-disable-next-line no-console
+    console.warn('[oss] compile-diagnostics sink threw:', err);
+  }
+}