Renaming 200 PDFs by Their Content — Without an LLM

All tests run on an 8-year-old MacBook Air. "scan_20260101_0042.pdf" tells you nothing. Smart Rename reads the first page of each PDF and generates a meaningful filename. No API call, no LLM, no internet. Just heuristics and pattern matching in Rust. What the first page usually contains Most documents put identifying information near the top: document type, date, recipient, reference number. The challenge is extracting it reliably across wildly different layouts. pub fn extract_rename_candidates