Filter show by pattern, if requested

cry/cli.py

@@ -120,11 +120,16 @@ def refresh(url):
 
 
 @cli.command(name="show")
-def show():
+@click.argument("pattern", required=False, default="")
-    """Show feeds."""
+def show(pattern):
+    """Show feeds and entries.
+
+    If a pattern is supplied, then filter the feeds to urls or titles that
+    match the pattern. Otherwise, just show everything.
+    """
 
     db = database.Database.local()
-    feeds = db.load_all()
+    feeds = db.load_all(pattern=pattern or "")
 
     def feed_sort_key(f: feed.Feed) -> int:
         if len(f.entries) > 0:

cry/database.py

@@ -153,7 +153,9 @@ class Database:
             for url, last_fetched_ts, retry_after_ts, status, etag, modified in rows
         ]
 
-    def load_all(self, feed_limit: int = 20) -> list[feed.Feed]:
+    def load_all(self, feed_limit: int = 20, pattern: str = "") -> list[feed.Feed]:
+        pattern = pattern.replace("\\", "\\\\").replace("%", "\\%").replace("_", "\\_")
+        sql_pattern = f"%{pattern}%"
         cursor = self.db.execute(
             """
             SELECT
@@ -166,7 +168,10 @@ class Database:
               title,
               link
             FROM feeds
-            """
+            WHERE title LIKE :sql_pattern ESCAPE '\\'
+               OR link LIKE :sql_pattern ESCAPE '\\'
+            """,
+            {"sql_pattern": sql_pattern},
         )
         rows = cursor.fetchall()