Move files from gousb/usb to gousb

debug.go

@@ -0,0 +1,37 @@
+// Copyright 2013 Google Inc.  All rights reserved.
+// Copyright 2016 the gousb Authors.  All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package gousb
+
+// To enable internal debugging, set the GOUSB_DEBUG environment variable.
+
+import (
+	"io"
+	"io/ioutil"
+	"log" // TODO(kevlar): make a logger
+	"os"
+)
+
+var debug *log.Logger
+
+const debugEnvVarName = "GOUSB_DEBUG"
+
+func init() {
+	var out io.Writer = ioutil.Discard
+	if os.Getenv(debugEnvVarName) != "" {
+		out = os.Stderr
+	}
+	debug = log.New(out, "gousb: ", log.LstdFlags|log.Lshortfile)
+}