Class: RR::GenerateRunner

Inherits:
Object
  • Object
show all
Defined in:
lib/rubyrep/generate_runner.rb

Overview

This class implements the functionality of the ‘generate’ command.

Constant Summary collapse

CONFIG_TEMPLATE = 
<<EOF
RR::Initializer::run do |config|
  config.left = {
    :adapter  => 'postgresql', # or 'mysql2'
    :database => 'SCOTT',
    :username => 'scott',
    :password => 'tiger',
    :host     => '172.16.1.1'
  }

  config.right = {
    :adapter  => 'postgresql',
    :database => 'SCOTT',
    :username => 'scott',
    :password => 'tiger',
    :host     => '172.16.1.2'
  }

  config.include_tables 'dept'
  config.include_tables /^e/ # regexp matching all tables starting with e
  # config.include_tables /./ # regexp matching all tables in the database
end
EOF

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#options ⇒ Object

Provided options. Possible values:

  • :config_file: path to config file



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# File 'lib/rubyrep/generate_runner.rb', line 40

def options
  @options
end

Class Method Details

.run(args) ⇒ Object

Entry points for executing a processing run. args: the array of command line options that were provided by the user.



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# File 'lib/rubyrep/generate_runner.rb', line 92

def self.run(args)
  runner = new

  status = runner.process_options(args)
  if runner.options
    runner.execute
  end
  status
end

Instance Method Details

#execute ⇒ Object

Generates a configuration file template.



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# File 'lib/rubyrep/generate_runner.rb', line 81

def execute
  if File.exists?(options[:file_name])
    raise("Cowardly refuse to overwrite existing file '#{options[:file_name]}'")
  end
  File.open(options[:file_name], 'w') do |f|
    f.write CONFIG_TEMPLATE
  end
end

#process_options(args) ⇒ Object

Parses the given command line parameter array. Returns the status (as per UNIX conventions: 1 if parameters were invalid, 0 otherwise)



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# File 'lib/rubyrep/generate_runner.rb', line 45

def process_options(args)
  status = 0
  self.options = {}

  parser = OptionParser.new do |opts|
    opts.banner = <<EOS
Usage: #{$0} generate [file_name]

  Generates a configuration file template under name [file_name].
EOS
    opts.separator ""
    opts.separator "  Specific options:"

    opts.on_tail("--help", "Show this message") do
      $stderr.puts opts
      self.options = nil
    end
  end

  begin
    unprocessed_args = parser.parse!(args)
    if options # this will be +nil+ if the --help option is specified
      raise("Please specify the name of the configuration file") if unprocessed_args.empty?
      options[:file_name] = unprocessed_args[0]
    end
  rescue Exception => e
    $stderr.puts "Command line parsing failed: #{e}"
    $stderr.puts parser.help
    self.options = nil
    status = 1
  end

  return status
end