add missing class from fix for #254

1 files changed, 20 insertions, 0 deletions

diff --git a/lib/asciidoctor-pdf/core_ext/quantifiable_stdout.rb b/lib/asciidoctor-pdf/core_ext/quantifiable_stdout.rb
new file mode 100644
index 00000000..1e44cecb
--- /dev/null
+++ b/lib/asciidoctor-pdf/core_ext/quantifiable_stdout.rb
@@ -0,0 +1,20 @@
+require 'delegate'
+
+# A delegator that allows the size method to be used on the STDOUT object.
+#
+# The size of the content written to STDOUT cannot be measured normally. This
+# class wraps the STDOUT object so the cumulative size of the content passed to
+# the write method (while wrapped in this decorator) can be measured.
+class QuantifiableStdout < SimpleDelegator
+  attr_reader :size
+
+  def initialize delegate
+    @size = 0
+    super
+  end
+
+  def write content
+    @size += content.bytesize
+    super
+  end
+end