[update] Improved the rules of files to be ignored by git.

.bin/.gitignore

@@ -1,3 +1,5 @@
 *
+
+!/*/
+!/songs/*
 !/.gitignore
-!/songs

.bin/songs/test-60bpm.sj

@@ -0,0 +1,47 @@
+actor [0..100] {
+  color_a := 1;
+
+  clip_left := 0.1;
+}
+background [0..100] {
+  inner_r = 0.8;
+  inner_g = 0.8;
+  inner_b = 0.8;
+  inner_a = 1;
+
+  outer_r = 0;
+  outer_g = 0;
+  outer_b = 0;
+  outer_a = 1;
+}
+posteffect [0..100] {
+  clip_left  := 0.1;
+  clip_right := 0.1;
+}
+
+$repeat i 10 {
+  $repeat j 20 {
+    circle [$i..$i+2] {
+      color_r := 0.8;
+      color_g := 0.1;
+      color_b := 0.1;
+      color_a := 1;
+
+      damage       := 0.1;
+      nearness_coe := 0.01;
+
+      __theta       := 2*3.14/20 * $j;
+      translation_x := cos(__theta) * 0.5;
+      translation_y := sin(__theta) * 0.5;
+      scale_x       := 0.025;
+      scale_y       := 0.025;
+
+      __atan    := atan2(actor_y - translation_y, actor_x - translation_x);
+      __speed_x := cos(__atan) * 0.015;
+      __speed_y := sin(__atan) * 0.015;
+
+      translation_x += __speed_x;
+      translation_y += __speed_y;
+    }
+  }
+}

.gitignore

@@ -1,6 +1,7 @@
-.dub
-.bin
-!/.bin
+.dub/
 dub.selections.json
 
+**/.bin/*
+!/.bin/*
+
 *.swp