Atlas Coderunner Plugin

This project transforms O'Reilly Atlas markup like this:

<pre data-executable="true" data-code-language="python">
import math
for x in range(0, 1200, 30):
   l = 20 * math.sin(x/57.3) + 50
   print " "*int(l/2) + "*"*int(l/2)
</pre>

Into a browser plugin where you can run the code, like this:

import math
for x in range(0, 1200, 30):
   l = 20 * math.sin(x/57.3) + 50
   print " "*int(l/2) + "*"*int(l/2)

The plugin provides:

CodeMirror for editing code sample.
JSREPL for running the code sample. There are many caveats on what you can do with this tool, but it is awesome.
JQconsole for viewing the output and providing a basic REPL for the selected language. (More on this in a bit)

These will allow you to:

Transform code samples (with caveats!) in Atlas into a live example in your project
Edit the code samples in a nice editor
Click "Run" to execute the code
Interact with the code in a console, including accepting user input (i.e., use Ruby's gets or Python's input and doing something with the result.)
Running general commands in a REPL

This project was hugely moved forward thanks to Geert Kapteijns awesome post Interactive Ruby in the browser for showing how to put JSREPL and JQ-CONSOLE together.

In addition to just running a program, some other use cases include:

Defining a Python function and running it in the console

This program defines a Python script that print's Pascal's triangle:

<pre data-executable="true" data-code-language="python">

def triangle(n):
   if n == 0:
      return []
   elif n == 1:
      return [[1]]
   else:
      new_row = [1]
      result = triangle(n-1)
      last_row = result[-1]
      for i in range(len(last_row)-1):
         new_row.append(last_row[i] + last_row[i+1])
      new_row += [1]
      result.append(new_row)
   return result

def pascal(n):
   for row in triangle(n):
      print('{0:^120}'.format(row))

</pre>

In this example, you hit "Run" and two functions get define. You can then run them on the console by typing triangle(10) to get back a python object, or do pascal(10) to get a pretty printed version.

def triangle(n):
   if n == 0:
      return []
   elif n == 1:
      return [[1]]
   else:
      new_row = [1]
      result = triangle(n-1)
      last_row = result[-1]
      for i in range(len(last_row)-1):
         new_row.append(last_row[i] + last_row[i+1])
      new_row += [1]
      result.append(new_row)
   return result

def pascal(n):
   for row in triangle(n):
      print('{0:^120}'.format(row))

Read input from user in Ruby

This example uses Ruby's code function to add two numbers:

<pre data-executable="true" data-code-language="python">
puts "Enter A"
a = gets.chomp
puts "Enter B"
b = gets.chomp
puts "The answer is "
c = Integer(a) + Integer(b)
puts c
</pre>

puts "Enter A"
a = gets.chomp
puts "Enter B"
b = gets.chomp
puts "The answer is "
c = Integer(a) + Integer(b)
puts c