Handle ParseError in CLI commands for malformed input

sigflow/cli/commands.py

@@ -1,26 +1,42 @@
 from pathlib import Path
 from sigflow.core.engine import Engine
+from sigflow.core.exceptions import ParseError
 from sigflow.serializers.wire import dumps
 from sigflow.utils.formatting import table
 
 
 def parse_command(args) -> int:
     data = Path(args.path).read_bytes()
-    result = Engine().process(data)
+
+    try:
+        result = Engine().process(data)
+    except ParseError as exc:
+        print(f"error: {exc}")
+        return 1
+
     if args.format == "json":
         print(dumps(result.frames))
     else:
         rows = [("stream", "sequence", "size")] + [(f.stream_id, f.sequence, f.size) for f in result.frames]
         print(table(rows))
+
     return 0
 
 
 def validate_command(args) -> int:
     data = Path(args.path).read_bytes()
-    result = Engine().process(data)
+
+    try:
+        result = Engine().process(data)
+    except ParseError as exc:
+        print(f"error: {exc}")
+        return 1
+
     for diag in result.diagnostics:
         print(f"{diag.severity}: {diag.code} at {diag.offset}: {diag.message}")
+
     print(f"frames={len(result.frames)} diagnostics={len(result.diagnostics)}")
+
     return 0 if not result.diagnostics else 1