Ruby solution for week 3, part 2

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diff --git a/challenge-003/abigail/ruby/ch-2.rb b/challenge-003/abigail/ruby/ch-2.rb
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+#!/usr/bin/ruby
+
+#
+# See ../README.md
+#
+ 
+#
+# Run as: ruby ch-1.rb < input-file
+#
+
+ARGF . each_line do |_|
+    rows = _ . to_i   
+
+    #
+    # 0-th row
+    #
+    row = [1]
+    puts row [0]
+    for r in 1 .. rows do
+        #
+        # Create new row
+        #
+        new = []
+        for i in 0 .. r do
+            new [i] = (i == 0 ? 0 : row [i - 1]) +
+                      (i == r ? 0 : row [i])
+            if i > 0
+            then print " "
+            end
+            print new [i]
+        end
+        puts ""
+
+        #
+        # New row becomes current row
+        #
+        row = new
+    end
+end