test $INPUT_RANDOM_WEIGHT_FILE

src/device/input/input.go

@@ -1,9 +1,15 @@
 package input
 
+import "os"
+
 type Input interface {
 	Read() []Button
 }
 
 func New() Input {
-	return NewRandom(randomCharFromRange('a', 'g'))
+	foo := randomCharFromRange('a', 'g')
+	if p, ok := os.LookupEnv("INPUT_RANDOM_WEIGHT_FILE"); ok {
+		foo = randomCharFromWeightFile(p)
+	}
+	return NewRandom(foo)
 }