Platform independent method to detect a working nodejs binary in the system via a ruby script. (C) MIT

detect_node.rb

class DetectNode
  MIN_VER = [0, 10, 0]

  def self.detect
    node_bins.each do |node|
      detected_version = (`#{node} --version`)[1..-1].split(".") rescue [0,0,0]
      if detected_version[0].to_i >= MIN_VER[0] and
          detected_version[1].to_i >= MIN_VER[1] and
          detected_version[2].to_i >= MIN_VER[2]
            return node
      end
    end
    raise "Could not find a nodejs version equal or higher to v#{MIN_VER.join(".")}"
  end


  private

  def self.node_bins
    node_binaries = [ 'node', 'nodejs' ]
    detected = []
    exts = ENV['PATHEXT'] ? ENV['PATHEXT'].split(';') : ['']
    ENV['PATH'].split(File::PATH_SEPARATOR).each do |path|
      exts.each { |ext|
        node_binaries.each do |cmd|
          bin = File.join(path, "#{cmd}#{ext}")
          detected << bin if File.executable?(bin) && !File.directory?(bin)
        end
      }
    end
    return detected
  end
end

Slightly different nice tkw