Add retry logic with exponential backoff for 429 rate limits

README.md

@@ -352,12 +352,12 @@ for name, count in sorted(cards.items()):
 
 ## Collection Stats
 
-- **Total cards:** 0
+- **Total cards:** 1356
-- **Unique cards:** 0
+- **Unique cards:** 916
 - **By type:**
   - Artifacts: 77
-  - Creatures: 390
+  - Creatures: 392
-  - Enchantments: 63
+  - Enchantments: 64
   - Instants: 109
   - Lands: 72
   - Planeswalkers: 2

hydrate.py

@@ -40,11 +40,12 @@ def parse_decklist(filepath: str) -> list[dict]:
     return cards
 
 
-def fetch_card(name: str) -> Optional[dict]:
+def fetch_card(name: str, retry_count: int = 3) -> Optional[dict]:
     """Fetch card data from Scryfall API using fuzzy search."""
     encoded = urllib.parse.quote(name)
     url = f"{SCRYFALL_API}/cards/named?fuzzy={encoded}"
     
+    for attempt in range(retry_count):
         try:
             req = urllib.request.Request(url, headers={
                 "User-Agent": "EDHDeckBuilder/1.0",
@@ -53,6 +54,19 @@ def fetch_card(name: str) -> Optional[dict]:
             with urllib.request.urlopen(req, timeout=30) as response:
                 return json.loads(response.read().decode("utf-8"))
         except urllib.error.HTTPError as e:
+            if e.code == 429:
+                retry_after = int(e.headers.get("Retry-After", 60))
+                print(f"  Rate limited. Waiting {retry_after}s...", file=sys.stderr)
+                time.sleep(retry_after)
+            elif e.code == 404:
+                print(f"  Error fetching '{name}': Not found", file=sys.stderr)
+                return None
+            else:
+                if attempt < retry_count - 1:
+                    wait_time = 2 ** attempt
+                    print(f"  HTTP {e.code}, retrying in {wait_time}s...", file=sys.stderr)
+                    time.sleep(wait_time)
+                else:
                     print(f"  Error fetching '{name}': HTTP {e.code}", file=sys.stderr)
                     return None
         except urllib.error.URLError as e:
@@ -62,6 +76,8 @@ def fetch_card(name: str) -> Optional[dict]:
             print(f"  Error parsing response for '{name}'", file=sys.stderr)
             return None
     
+    return None
+
 
 def extract_card_info(card_data: dict) -> dict:
     """Extract relevant fields from Scryfall card data."""