add logger

src/log.rs

@@ -0,0 +1,14 @@
+#[macro_export]
+macro_rules! outln {
+    ($($expr:expr),+) => {{
+        use std::io::{Write};
+        use std::fs::OpenOptions;
+        let mut file = OpenOptions::new()
+            .write(true)
+            .create(true)
+            .append(true)
+            .open("gobang.log")
+            .unwrap();
+        writeln!(file, $($expr),+).expect("Can't write output");
+    }}
+}