lib/facet/kernel/demo.rb in facets-0.9.0 vs lib/facet/kernel/demo.rb in facets-1.0.0

@@ -1,45 +1,90 @@
-require 'nano/kernel/demo.rb'
\ No newline at end of file
+module Kernel
+  module_function
+  # For debugging and showing examples. Currently this
+  # takes an argument of a string in a block.
+  #
+  #   demo {%{ a = [1,2,3] }}
+  #   demo {%{ a.slice(1,2) }}
+  #   demo {%{ a.map { |x| x**3 } }}
+  #
+  # Produces:
+  #
+  #   a = [1,2,3]             #=>  [1, 2, 3]
+  #   a.slice(1,2)            #=>  [2, 3]
+  #   a.map { |x| x**3 }      #=>  [1, 8, 27]
+  #
+  #--
+  # Is there a way to do this without the eval string in block?
+  # Preferably just a block and no string.
+  #++
+  def demo(out=$stdout,&block)
+    out << sprintf("%-25s#=>  %s\n", expr = block.call, eval(expr, block.binding).inspect)
+  end
+end
+
+
+#  _____         _
+# |_   _|__  ___| |_
+#   | |/ _ \/ __| __|
+#   | |  __/\__ \ |_
+#   |_|\___||___/\__|
+#
+=begin test
+
+  require 'test/unit'
+
+  class TCKernel < Test::Unit::TestCase
+
+    def test_demo
+      demo(i=''){%{ a = [1,2,3] }}
+      o = " a = [1,2,3]             #=>  [1, 2, 3]\n"
+      assert_equal( o, i )
+    end
+
+  end
+
+=end