1 files changed, 7 insertions, 0 deletions
diff --git a/lib/range_ext.rb b/lib/range_ext.rb
new file mode 100644
index 000000000..5afb44dee
--- /dev/null
+++ b/lib/range_ext.rb
@@ -0,0 +1,7 @@
+class Range
+  def intersection(other)
+    return nil if (self.max < other.begin or other.max < self.begin)
+    [self.begin, other.begin].max..[self.max, other.max].min
+  end
+  alias_method :&, :intersection
+end