add debug

src/debug.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+var debug = os.Getenv("__ARGON_DEBUG__") == "true"
+
+func debugPrintln(a ...interface{}) {
+	if debug {
+		go func() {
+			defer func() {
+				if r := recover(); r != nil {
+					fmt.Println("debugPrintln: panic:", r)
+				}
+			}()
+			fmt.Println(a...)
+		}()
+	}
+}