initial commit

src/distill.ts

@@ -0,0 +1,47 @@
+const ERROR_RE = /\b(?:error|failed|failure|missing|undefined|exception)\b/i;
+const LOCATION_RE = /\b(?:at\s+.+:\d+(?::\d+)?)\b|(?:[A-Za-z0-9_./-]+\.(?:ts|tsx|js|mjs|json|md):\d+(?::\d+)?)/i;
+const MAX_SUMMARY_LENGTH = 320;
+const MAX_LINES = 2;
+
+function unique(lines: string[]): string[] {
+  return lines.filter((line, index) => lines.indexOf(line) === index);
+}
+
+function pickSalientLines(content: string): string[] {
+  const lines = content
+    .split(/\n+/)
+    .map((line) => line.trim())
+    .filter(Boolean);
+
+  if (lines.length === 0) {
+    return [];
+  }
+
+  const important = unique(lines.filter((line) => ERROR_RE.test(line)));
+  const location = unique(lines.filter((line) => LOCATION_RE.test(line)));
+  const fallback = unique(lines);
+
+  const selected: string[] = [];
+  for (const line of [...important, ...location, ...fallback]) {
+    if (selected.includes(line)) {
+      continue;
+    }
+
+    selected.push(line);
+    if (selected.length >= MAX_LINES) {
+      break;
+    }
+  }
+
+  return selected;
+}
+
+export function distillToolResult(input: { toolName?: string; content: string }): string | undefined {
+  const picked = pickSalientLines(input.content);
+  if (picked.length === 0) {
+    return undefined;
+  }
+
+  const prefix = `[distilled ${input.toolName ?? "tool"} output]`;
+  return `${prefix} ${picked.join("; ")}`.slice(0, MAX_SUMMARY_LENGTH);
+}