Manage Project Euler problems form the command line.

$ gem install euler-manager

Euler manager has 7 commands:

init initializes an empty Eulerfile.rb in the directory you are currently in.

$ euler init

new initializes a solution. This typically means creating the directory for the solution and populating it with some files.

$ euler new [problem_id] [language]

desc shows a problem's prompt.

$ euler desc [problem_id]

run executes a solution.

$ euler run [problem_id] [language]

test runs a solution to see if it is correct.

$ euler test [problem_id] [language]

test_all runs all of your solutions to see if they are correct.

$ euler test_all

include_images will copy Project Euler's images into your euler managed directory so that you can access them without an Internet connection.

$ euler include_images

If you do not pass a problem id and language to the desc, run, or test commands Euler manager will use the directory it was invoked from to try to guess which problem id and language to use. So if you want to run the ruby solution for problem number 1 then you can just run $ euelr run from 1/ruby (by default) and Euler manager will run the ruby solution for problem 1.

• coffeescript
• haskell
• javascript
• java
• python
• ruby
• scala
• julia
• perl

To configure the Euler manager place an Eulerfile.rb in the root of your project. Typically you can just keep this file empty but if you want to change any of the Euler manager's defaults or register an additional language you would do that here.

See /example/Eulerfile.rb for an example Eulerfile.rb.

If Euler manager does not support your programming language of choice by default or you would like to change how a supported language functions then you use the Euler.register_language method. This method accepts the name of the language you are registering and a class definition for that language.

Feel free to send a pull request with additional languages.

    Euler.register_language('ruby', Class.new do
      # Run the solution
      def run(solution)
        `ruby #{file_path(solution)}`
      end

      # Copy the template into the solution's directory
      def init(solution)
        FileUtils.cp(template_path, file_path(solution))
      end

      private

      # Returns the path to the solution
      def file_path(solution)
        "#{solution.dir}/#{solution.problem.id}.rb"
      end

      # Returns the path to the ruby template
      def template_path
        "#{File.dirname(__FILE__)}/templates/ruby.rb"
      end
    end)

The init method of the language's class is optional but he run method is required.

For more examples of registering languages see the /lib/euler/languages directory or the Eulerfile.rb in the /example directory.

Pull requests are welcome!

Please send pull requests to the develop branch.

• add more languages
• better error messages
• documentation could be better?
• tests could probably be better too