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Run ruby from inside Markdown. Denote code by leading TAB. (four spaces won't work)
Raw
README.md

Literate Ruby

Inspired by Literate CoffeeScript.

$ cat hello.litrb
Here's a simple program

    puts "Hello, world"
$ ruby litrb.rb < hello.litrb
Hello, world
Raw
litrb.rb
eval ARGF.readlines.select { |line| line[/^\t/] }.map { |line| line[1..-1] }.join
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