fix: ignore reaction directives in inline code

src/discord/response.ts

@@ -4,11 +4,64 @@ export interface ParsedClaudeResponse {
     historyContent: string;
 }
 
+interface InlineCodeSpan {
+    start: number;
+    end: number;
+}
+
+function findInlineCodeSpans(text: string): InlineCodeSpan[] {
+    const spans: InlineCodeSpan[] = [];
+    let index = 0;
+
+    while (index < text.length) {
+        if (text[index] !== "`") {
+            index++;
+            continue;
+        }
+
+        let markerEnd = index + 1;
+        while (text[markerEnd] === "`") markerEnd++;
+        const marker = text.slice(index, markerEnd);
+        const lineBreakOffset = text.slice(markerEnd).search(/[\r\n]/);
+        const lineEnd =
+            lineBreakOffset === -1 ? text.length : markerEnd + lineBreakOffset;
+        const closingStart = text.indexOf(marker, markerEnd);
+        if (closingStart === -1 || closingStart >= lineEnd) {
+            index = markerEnd;
+            continue;
+        }
+
+        spans.push({
+            start: index,
+            end: closingStart + marker.length,
+        });
+        index = closingStart + marker.length;
+    }
+
+    return spans;
+}
+
+function isInsideInlineCode(spans: InlineCodeSpan[], index: number): boolean {
+    return spans.some((span) => index >= span.start && index < span.end);
+}
+
 export function parseClaudeResponse(response: string): ParsedClaudeResponse {
-    const reactions = [...response.matchAll(/\[REACT:(.+?)\]/g)].map((match) =>
-        match[1].trim(),
-    );
-    const text = response.replace(/\[REACT:(.+?)\]\s*/g, "").trim();
+    const inlineCodeSpans = findInlineCodeSpans(response);
+    const reactions: string[] = [];
+    const removals: { start: number; end: number }[] = [];
+
+    for (const match of response.matchAll(/\[REACT:(.+?)\]\s*/g)) {
+        const start = match.index ?? 0;
+        if (isInsideInlineCode(inlineCodeSpans, start)) continue;
+        reactions.push(match[1].trim());
+        removals.push({ start, end: start + match[0].length });
+    }
+
+    let text = response;
+    for (const removal of removals.reverse()) {
+        text = text.slice(0, removal.start) + text.slice(removal.end);
+    }
+    text = text.trim();
 
     return {
         reactions,

tests/responseInlineCode.test.mjs

@@ -0,0 +1,15 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+
+import { parseClaudeResponse } from "../build/discord/response.js";
+
+test("keeps reaction tags inside inline code spans as literal text", () => {
+    assert.deepEqual(
+        parseClaudeResponse("Use `[REACT:literal]` in docs. [REACT:thumbsup] Done."),
+        {
+            reactions: ["thumbsup"],
+            text: "Use `[REACT:literal]` in docs. Done.",
+            historyContent: "Use `[REACT:literal]` in docs. Done.",
+        },
+    );
+});