Class: Semi::Driver

Inherits:
Object
  • Object
show all
Defined in:
lib/semi/driver.rb

Instance Method Summary collapse

Constructor Details

#initialize(path) ⇒ Driver

Returns a new instance of Driver.



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# File 'lib/semi/driver.rb', line 7

def initialize(path)
  @config = Semi::Config.new(path)
end

Instance Method Details

#start ⇒ Object 



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# File 'lib/semi/driver.rb', line 11

def start
  # Initialize the dictionary with the defaults
  @dictionary = {}
  @config.defaults.each_pair do |name,val|
    hints = @config.validators[name] || nil
    @dictionary[name] = Semi::Variable.import(val, hints)
  end

  # Now manually merge in the env vars
  ENV.each_pair do |name, val|
    hints = @config.validators[name] || nil
    @dictionary[name] = Semi::Variable.import(val, hints)
  end

  #puts @dictionary.inspect

  # Check any validations being asserted
  @config.validators.each_key { |key|
    begin
      Semi::validate(@dictionary[key], @config.validators[key])
    rescue Semi::ValidationError => err
      if @dictionary.include? key
        puts "Can not validate #{key}: #{err}"
      elsif @config.validators[key].include? 'required'
        puts "#{key} is a required value, but it was not found."
        exit(5)
      end
    end
  }

  # prepare the dictionary for the templates
  @dictionary = OpenStruct.new(@dictionary)

  # Process the config files and generate final versions
  @config.files.each do |file|
    # Read the template file and render
    if File.exist? file
      contents = File.open(file, 'r') do |fp|
        renderer = ERB.new(fp.readlines.join, nil, '%<>-')
        renderer.result(@dictionary.instance_eval {binding})
      end

      # Reopen the file and write the rendered contents
      File.open(file, 'w') do |fp|
        fp.write(contents)
      end
    end
  end

  # Check for pre-defined commands
  args = ARGV
  if args.count == 0 and @config.commands.include? 'default'
    args = @config.commands['default']
  elsif args.count == 1 and args[0] == 'help'
    puts "This container also supports the following commands:"
    puts""
    printf("  %-10s||   %s\n", 'Command', 'Actual command run / description')
    puts "---------------------------------------------------------------"
    @config.commands.each_pair do |cmd, cmd_line|
      printf("  %-10s   => %s\n", cmd, cmd_line)
    end
    printf("  %-10s   => %s\n", 'help', 'List shortcut and additional commands')
    exit(0)
  elsif @config.commands.include? args[0]
    args = @config.commands[args[0]]
  end
  

  # Execute the command line
  #puts "Executing: #{args}"
  exec([args].flatten.join(' '))
end