fix: handle unpacked slice (#51)

sloglint.go

@@ -242,21 +242,24 @@ func visit(pass *analysis.Pass, opts *Options, node ast.Node, stack []ast.Node)
 		if typ == nil {
 			continue
 		}
+
 		switch typ.String() {
 		case "string":
 			keys = append(keys, args[i])
 			i++ // skip the value.
 		case "log/slog.Attr":
 			attrs = append(attrs, args[i])
+		case "[]any", "[]log/slog.Attr":
+			continue // the last argument may be an unpacked slice, skip it.
 		}
 	}
 
 	switch {
 	case opts.KVOnly && len(attrs) > 0:
 		pass.Reportf(call.Pos(), "attributes should not be used")
-	case opts.AttrOnly && len(attrs) < len(args):
+	case opts.AttrOnly && len(keys) > 0:
 		pass.Reportf(call.Pos(), "key-value pairs should not be used")
-	case opts.NoMixedArgs && 0 < len(attrs) && len(attrs) < len(args):
+	case opts.NoMixedArgs && len(attrs) > 0 && len(keys) > 0:
 		pass.Reportf(call.Pos(), "key-value pairs and attributes should not be mixed")
 	}
 

testdata/src/attr_only/attr_only.go

@@ -12,4 +12,7 @@ func tests() {
 	slog.Info("msg", "foo", 1, "bar", 2)                // want `key-value pairs should not be used`
 	slog.Info("msg", "foo", 1, slog.Int("bar", 2))      // want `key-value pairs should not be used`
 	slog.With("foo", 1, slog.Int("bar", 2)).Info("msg") // want `key-value pairs should not be used`
+
+	args := []slog.Attr{slog.Int("foo", 1), slog.Int("bar", 2)}
+	slog.LogAttrs(nil, slog.LevelInfo, "msg", args...)
 }

testdata/src/kv_only/kv_only.go

@@ -15,4 +15,7 @@ func tests() {
 	slog.With(slog.Int("foo", 1)).Info("msg")                     // want `attributes should not be used`
 	slog.With(slog.Int("foo", 1), slog.Int("bar", 2)).Info("msg") // want `attributes should not be used`
 	slog.With("foo", 1, slog.Int("bar", 2)).Info("msg")           // want `attributes should not be used`
+
+	args := []any{"foo", 1, "bar", 2}
+	slog.Log(nil, slog.LevelInfo, "msg", args...)
 }