Memory/QMD: robustly parse noisy qmd JSON output

src/memory/qmd-query-parser.ts

@@ -25,11 +25,19 @@ export function parseQmdQueryJson(stdout: string, stderr: string): QmdQueryResul
     throw new Error(`qmd query returned invalid JSON: ${message}`);
   }
   try {
-    const parsed = JSON.parse(trimmedStdout) as unknown;
-    if (!Array.isArray(parsed)) {
+    const parsed = parseQmdQueryResultArray(trimmedStdout);
+    if (parsed !== null) {
+      return parsed;
+    }
+    const noisyPayload = extractFirstJsonArray(trimmedStdout);
+    if (!noisyPayload) {
       throw new Error("qmd query JSON response was not an array");
     }
-    return parsed as QmdQueryResult[];
+    const fallback = parseQmdQueryResultArray(noisyPayload);
+    if (fallback !== null) {
+      return fallback;
+    }
+    throw new Error("qmd query JSON response was not an array");
   } catch (err) {
     const message = err instanceof Error ? err.message : String(err);
     log.warn(`qmd query returned invalid JSON: ${message}`);
@@ -45,3 +53,56 @@ function isQmdNoResultsOutput(raw: string): boolean {
 function summarizeQmdStderr(raw: string): string {
   return raw.length <= 120 ? raw : `${raw.slice(0, 117)}...`;
 }
+
+function parseQmdQueryResultArray(raw: string): QmdQueryResult[] | null {
+  try {
+    const parsed = JSON.parse(raw) as unknown;
+    if (!Array.isArray(parsed)) {
+      return null;
+    }
+    return parsed as QmdQueryResult[];
+  } catch {
+    return null;
+  }
+}
+
+function extractFirstJsonArray(raw: string): string | null {
+  const start = raw.indexOf("[");
+  if (start < 0) {
+    return null;
+  }
+  let depth = 0;
+  let inString = false;
+  let escaped = false;
+  for (let i = start; i < raw.length; i += 1) {
+    const char = raw[i];
+    if (char === undefined) {
+      break;
+    }
+    if (inString) {
+      if (escaped) {
+        escaped = false;
+        continue;
+      }
+      if (char === "\\") {
+        escaped = true;
+      } else if (char === '"') {
+        inString = false;
+      }
+      continue;
+    }
+    if (char === '"') {
+      inString = true;
+      continue;
+    }
+    if (char === "[") {
+      depth += 1;
+    } else if (char === "]") {
+      depth -= 1;
+      if (depth === 0) {
+        return raw.slice(start, i + 1);
+      }
+    }
+  }
+  return null;
+}