Rake::Application

Rake main application object. When invoking rake from the command line, a Rake::Application object is created and run.

Constants

DEFAULT_RAKEFILES

Attributes

name[R]

The name of the application (typically ‘rake’)

original_dir[R]

The original directory where rake was invoked.

rakefile[R]

Name of the actual rakefile used.

terminal_columns[RW]

Number of columns on the terminal

top_level_tasks[R]

List of the top level task names (task names from the command line).

Public Class Methods

new() click to toggle source

Initialize a Rake::Application object.

 
               # File rake/application.rb, line 41
def initialize
  super
  @name = 'rake'
  @rakefiles = DEFAULT_RAKEFILES.dup
  @rakefile = nil
  @pending_imports = []
  @imported = []
  @loaders = {}
  @default_loader = Rake::DefaultLoader.new
  @original_dir = Dir.pwd
  @top_level_tasks = []
  add_loader('rb', DefaultLoader.new)
  add_loader('rf', DefaultLoader.new)
  add_loader('rake', DefaultLoader.new)
  @tty_output = STDOUT.tty?
  @terminal_columns = ENV['RAKE_COLUMNS'].to_i
end

Public Instance Methods

add_import(fn) click to toggle source

Add a file to the list of files to be imported.

 
               # File rake/application.rb, line 659
def add_import(fn)
  @pending_imports << fn
end

add_loader(ext, loader) click to toggle source

Add a loader to handle imported files ending in the extension ext.

 
               # File rake/application.rb, line 123
def add_loader(ext, loader)
  ext = ".#{ext}" unless ext =~ /^\./
  @loaders[ext] = loader
end

collect_tasks() click to toggle source

Collect the list of tasks on the command line. If no tasks are given, return a list containing only the default task. Environmental assignments are processed at this time as well.

 
               # File rake/application.rb, line 646
def collect_tasks
  @top_level_tasks = []
  ARGV.each do |arg|
    if arg =~ /^(\w+)=(.*)$/
      ENV[$1] = $2
    else
      @top_level_tasks << arg unless arg =~ /^-/
    end
  end
  @top_level_tasks.push("default") if @top_level_tasks.size == 0
end

const_warning(const_name) click to toggle source

Warn about deprecated use of top level constant names.

 
               # File rake/application.rb, line 678
def const_warning(const_name)
  @const_warning ||= false
  if ! @const_warning
    $stderr.puts %Q{WARNING: Deprecated reference to top-level constant '#{const_name}' } +
      %Q{found at: #{rakefile_location}} # '
    $stderr.puts %Q{    Use --classic-namespace on rake command}
    $stderr.puts %Q{    or 'require "rake/classic_namespace"' in Rakefile}
  end
  @const_warning = true
end

deprecate(old_usage, new_usage, call_site) click to toggle source

Warn about deprecated usage.

Example:

Rake.application.deprecate("import", "Rake.import", caller.first)

 
               # File rake/application.rb, line 192
def deprecate(old_usage, new_usage, call_site)
  return if options.ignore_deprecate
  $stderr.puts "WARNING: '#{old_usage}' is deprecated.  " +
    "Please use '#{new_usage}' instead.\n" +
    "    at #{call_site}"
end

display_error_message(ex) click to toggle source

Display the error message that caused the exception.

 
               # File rake/application.rb, line 175
def display_error_message(ex)
  trace "#{name} aborted!"
  trace ex.message
  if options.backtrace
    trace ex.backtrace.join("\n")
  else
    trace Backtrace.collapse(ex.backtrace).join("\n")
  end
  trace "Tasks: #{ex.chain}" if has_chain?(ex)
  trace "(See full trace by running task with --trace)" unless options.backtrace
end

display_prerequisites() click to toggle source

Display the tasks and prerequisites

 
               # File rake/application.rb, line 312
def display_prerequisites
  tasks.each do |t|
    puts "#{name} #{t.name}"
    t.prerequisites.each { |pre| puts "    #{pre}" }
  end
end

display_tasks_and_comments() click to toggle source

Display the tasks and comments.

 
               # File rake/application.rb, line 236
def display_tasks_and_comments
  displayable_tasks = tasks.select { |t|
    (options.show_all_tasks || t.comment) && t.name =~ options.show_task_pattern
  }
  case options.show_tasks
  when :tasks
    width = displayable_tasks.collect { |t| t.name_with_args.length }.max || 10
    max_column = truncate_output? ? terminal_width - name.size - width - 7 : nil

    displayable_tasks.each do |t|
      printf "#{name} %-#{width}s  # %s\n",
        t.name_with_args, max_column ? truncate(t.comment, max_column) : t.comment
    end
  when :describe
    displayable_tasks.each do |t|
      puts "#{name} #{t.name_with_args}"
      comment = t.full_comment || ""
      comment.split("\n").each do |line|
        puts "    #{line}"
      end
      puts
    end
  when :lines
    displayable_tasks.each do |t|
      t.locations.each do |loc|
        printf "#{name} %-30s %s\n",t.name_with_args, loc
      end
    end
  else
    fail "Unknown show task mode: '#{options.show_tasks}'"
  end
end

dynamic_width() click to toggle source

Calculate the dynamic width of the

 
               # File rake/application.rb, line 281
def dynamic_width
  @dynamic_width ||= (dynamic_width_stty.nonzero? || dynamic_width_tput)
end

dynamic_width_stty() click to toggle source

 
               # File rake/application.rb, line 285
def dynamic_width_stty
  %x{stty size 2>/dev/null}.split[1].to_i
end

dynamic_width_tput() click to toggle source

 
               # File rake/application.rb, line 289
def dynamic_width_tput
  %x{tput cols 2>/dev/null}.to_i
end

find_rakefile_location() click to toggle source

 
               # File rake/application.rb, line 569
def find_rakefile_location
  here = Dir.pwd
  while ! (fn = have_rakefile)
    Dir.chdir("..")
    if Dir.pwd == here || options.nosearch
      return nil
    end
    here = Dir.pwd
  end
  [fn, here]
ensure
  Dir.chdir(Rake.original_dir)
end

handle_options() click to toggle source

Read and handle the command line options.

 
               # File rake/application.rb, line 524
def handle_options
  options.rakelib = ['rakelib']
  options.trace_output = $stderr

  OptionParser.new do |opts|
    opts.banner = "rake [-f rakefile] {options} targets..."
    opts.separator ""
    opts.separator "Options are ..."

    opts.on_tail("-h", "--help", "-H", "Display this help message.") do
      puts opts
      exit
    end

    standard_rake_options.each { |args| opts.on(*args) }
    opts.environment('RAKEOPT')
  end.parse!

  # If class namespaces are requested, set the global options
  # according to the values in the options structure.
  if options.classic_namespace
    $show_tasks = options.show_tasks
    $show_prereqs = options.show_prereqs
    $trace = options.trace
    $dryrun = options.dryrun
    $silent = options.silent
  end
end

have_rakefile() click to toggle source

True if one of the files in RAKEFILES is in the current directory. If a match is found, it is copied into @rakefile.

 
               # File rake/application.rb, line 207
def have_rakefile
  @rakefiles.each do |fn|
    if File.exist?(fn)
      others = FileList.glob(fn, File::FNM_CASEFOLD)
      return others.size == 1 ? others.first : fn
    elsif fn == ''
      return fn
    end
  end
  return nil
end

init(app_name='rake') click to toggle source

Initialize the command line parameters and app name.

 
               # File rake/application.rb, line 78
def init(app_name='rake')
  standard_exception_handling do
    @name = app_name
    handle_options
    collect_tasks
  end
end

invoke_task(task_string) click to toggle source

private —————————————————————-

 
               # File rake/application.rb, line 140
def invoke_task(task_string)
  name, args = parse_task_string(task_string)
  t = self[name]
  t.invoke(*args)
end

load_imports() click to toggle source

Load the pending list of imported files.

 
               # File rake/application.rb, line 664
def load_imports
  while fn = @pending_imports.shift
    next if @imported.member?(fn)
    if fn_task = lookup(fn)
      fn_task.invoke
    end
    ext = File.extname(fn)
    loader = @loaders[ext] || @default_loader
    loader.load(fn)
    @imported << fn
  end
end

load_rakefile() click to toggle source

Find the rakefile and then load it and any pending imports.

 
               # File rake/application.rb, line 87
def load_rakefile
  standard_exception_handling do
    raw_load_rakefile
  end
end

options() click to toggle source

Application options from the command line

 
               # File rake/application.rb, line 129
def options
  @options ||= OpenStruct.new
end

parse_task_string(string) click to toggle source

 
               # File rake/application.rb, line 146
def parse_task_string(string)
  if string =~ /^([^\[]+)(\[(.*)\])$/
    name = $1
    args = $3.split(/\s*,\s*/)
  else
    name = string
    args = []
  end
  [name, args]
end

print_rakefile_directory(location) click to toggle source

 
               # File rake/application.rb, line 583
def print_rakefile_directory(location)
  $stderr.puts "(in #{Dir.pwd})" unless
    options.silent or original_dir == location
end

rake_require(file_name, paths=$LOAD_PATH, loaded=$") click to toggle source

Similar to the regular Ruby require command, but will check for *.rake files in addition to *.rb files.

 
               # File rake/application.rb, line 555
def rake_require(file_name, paths=$LOAD_PATH, loaded=$")
  fn = file_name + ".rake"
  return false if loaded.include?(fn)
  paths.each do |path|
    full_path = File.join(path, fn)
    if File.exist?(full_path)
      Rake.load_rakefile(full_path)
      loaded << fn
      return true
    end
  end
  fail LoadError, "Can't find #{file_name}"
end

rakefile_location(backtrace=caller) click to toggle source

 
               # File rake/application.rb, line 689
def rakefile_location(backtrace=caller)
  backtrace.map { |t| t[/([^:]+):/,1] }

  re = /^#{@rakefile}$/
  re = /#{re.source}/ if windows?

  backtrace.find { |str| str =~ re } || ''
end

run() click to toggle source

Run the Rake application. The run method performs the following three steps:

Initialize the command line options (init).
Define the tasks (load_rakefile).
Run the top level tasks (top_level).

If you wish to build a custom rake command, you should call init on your application. Then define any tasks. Finally, call top_level to run your top level tasks.

 
               # File rake/application.rb, line 69
def run
  standard_exception_handling do
    init
    load_rakefile
    top_level
  end
end

run_with_threads() click to toggle source

Run the given block with the thread startup and shutdown.

 
               # File rake/application.rb, line 107
def run_with_threads
  thread_pool.gather_history if options.job_stats == :history

  yield

  thread_pool.join
  if options.job_stats
    stats = thread_pool.statistics
    puts "Maximum active threads: #{stats[:max_active_threads]}"
    puts "Total threads in play:  #{stats[:total_threads_in_play]}"
  end
  ThreadHistoryDisplay.new(thread_pool.history).show if options.job_stats == :history
end

standard_exception_handling() click to toggle source

Provide standard exception handling for the given block.

 
               # File rake/application.rb, line 158
def standard_exception_handling
  begin
    yield
  rescue SystemExit => ex
    # Exit silently with current status
    raise
  rescue OptionParser::InvalidOption => ex
    $stderr.puts ex.message
    exit(false)
  rescue Exception => ex
    # Exit with error message
    display_error_message(ex)
    exit(false)
  end
end

standard_rake_options() click to toggle source

A list of all the standard options used in rake, suitable for passing to OptionParser.

 
               # File rake/application.rb, line 333
def standard_rake_options
  sort_options(
    [
      ['--all', '-A', "Show all tasks, even uncommented ones",
        lambda { |value|
          options.show_all_tasks = value
        }
      ],
      ['--backtrace=[OUT]', "Enable full backtrace.  OUT can be stderr (default) or stdout.",
        lambda { |value|
          options.backtrace = true
          select_trace_output(options, 'backtrace', value)
        }
      ],
      ['--classic-namespace', '-C', "Put Task and FileTask in the top level namespace",
        lambda { |value|
          require 'rake/classic_namespace'
          options.classic_namespace = true
        }
      ],
      ['--comments', "Show commented tasks only",
        lambda { |value|
          options.show_all_tasks = !value
        }
      ],
      ['--describe', '-D [PATTERN]', "Describe the tasks (matching optional PATTERN), then exit.",
        lambda { |value|
          select_tasks_to_show(options, :describe, value)
        }
      ],
      ['--dry-run', '-n', "Do a dry run without executing actions.",
        lambda { |value|
          Rake.verbose(true)
          Rake.nowrite(true)
          options.dryrun = true
          options.trace = true
        }
      ],
      ['--execute',  '-e CODE', "Execute some Ruby code and exit.",
        lambda { |value|
          eval(value)
          exit
        }
      ],
      ['--execute-print',  '-p CODE', "Execute some Ruby code, print the result, then exit.",
        lambda { |value|
          puts eval(value)
          exit
        }
      ],
      ['--execute-continue',  '-E CODE',
        "Execute some Ruby code, then continue with normal task processing.",
        lambda { |value| eval(value) }
      ],
      ['--jobs',  '-j [NUMBER]',
        "Specifies the maximum number of tasks to execute in parallel. (default:2)",
        lambda { |value| options.thread_pool_size = [(value || 2).to_i,2].max }
      ],
      ['--job-stats [LEVEL]',
        "Display job statistics. LEVEL=history displays a complete job list",
        lambda { |value|
          if value =~ /^history/
            options.job_stats = :history
          else
            options.job_stats = true
          end
        }
      ],
      ['--libdir', '-I LIBDIR', "Include LIBDIR in the search path for required modules.",
        lambda { |value| $:.push(value) }
      ],
      ['--multitask', '-m', "Treat all tasks as multitasks.",
        lambda { |value| options.always_multitask = true }
      ],
      ['--no-search', '--nosearch', '-N', "Do not search parent directories for the Rakefile.",
        lambda { |value| options.nosearch = true }
      ],
      ['--prereqs', '-P', "Display the tasks and dependencies, then exit.",
        lambda { |value| options.show_prereqs = true }
      ],
      ['--quiet', '-q', "Do not log messages to standard output.",
        lambda { |value| Rake.verbose(false) }
      ],
      ['--rakefile', '-f [FILE]', "Use FILE as the rakefile.",
        lambda { |value|
          value ||= ''
          @rakefiles.clear
          @rakefiles << value
        }
      ],
      ['--rakelibdir', '--rakelib', '-R RAKELIBDIR',
        "Auto-import any .rake files in RAKELIBDIR. (default is 'rakelib')",
        lambda { |value| options.rakelib = value.split(File::PATH_SEPARATOR) }
      ],
      ['--reduce-compat', "Remove DSL in Object; remove Module#const_missing which defines ::Task etc.",
        # Load-time option.
        # Handled in bin/rake where Rake::REDUCE_COMPAT is defined (or not).
        lambda { |_| }
      ],
      ['--require', '-r MODULE', "Require MODULE before executing rakefile.",
        lambda { |value|
          begin
            require value
          rescue LoadError => ex
            begin
              rake_require value
            rescue LoadError
              raise ex
            end
          end
        }
      ],
      ['--rules', "Trace the rules resolution.",
        lambda { |value| options.trace_rules = true }
      ],
      ['--silent', '-s', "Like --quiet, but also suppresses the 'in directory' announcement.",
        lambda { |value|
          Rake.verbose(false)
          options.silent = true
        }
      ],
      ['--suppress-backtrace PATTERN', "Suppress backtrace lines matching regexp PATTERN. Ignored if --trace is on.",
        lambda { |value|
          options.suppress_backtrace_pattern = Regexp.new(value)
        }
      ],
      ['--system',  '-g',
        "Using system wide (global) rakefiles (usually '~/.rake/*.rake').",
        lambda { |value| options.load_system = true }
      ],
      ['--no-system', '--nosystem', '-G',
        "Use standard project Rakefile search paths, ignore system wide rakefiles.",
        lambda { |value| options.ignore_system = true }
      ],
      ['--tasks', '-T [PATTERN]', "Display the tasks (matching optional PATTERN) with descriptions, then exit.",
        lambda { |value|
          select_tasks_to_show(options, :tasks, value)
        }
      ],
      ['--trace=[OUT]', '-t', "Turn on invoke/execute tracing, enable full backtrace. OUT can be stderr (default) or stdout.",
        lambda { |value|
          options.trace = true
          options.backtrace = true
          select_trace_output(options, 'trace', value)
          Rake.verbose(true)
        }
      ],
      ['--verbose', '-v', "Log message to standard output.",
        lambda { |value| Rake.verbose(true) }
      ],
      ['--version', '-V', "Display the program version.",
        lambda { |value|
          puts "rake, version #{RAKEVERSION}"
          exit
        }
      ],
      ['--where', '-W [PATTERN]', "Describe the tasks (matching optional PATTERN), then exit.",
        lambda { |value|
          select_tasks_to_show(options, :lines, value)
          options.show_all_tasks = true
        }
      ],
      ['--no-deprecation-warnings', '-X', "Disable the deprecation warnings.",
        lambda { |value|
          options.ignore_deprecate = true
        }
      ],
    ])
end

system_dir() click to toggle source

The directory path containing the system wide rakefiles.

 
               # File rake/application.rb, line 620
def system_dir
  @system_dir ||=
    begin
      if ENV['RAKE_SYSTEM']
        ENV['RAKE_SYSTEM']
      else
        standard_system_dir
      end
    end
end

terminal_width() click to toggle source

 
               # File rake/application.rb, line 269
def terminal_width
  if @terminal_columns.nonzero?
    result = @terminal_columns
  else
    result = unix? ? dynamic_width : 80
  end
  (result < 10) ? 80 : result
rescue
  80
end

top_level() click to toggle source

Run the top level tasks of a Rake application.

 
               # File rake/application.rb, line 94
def top_level
  run_with_threads do
    if options.show_tasks
      display_tasks_and_comments
    elsif options.show_prereqs
      display_prerequisites
    else
      top_level_tasks.each { |task_name| invoke_task(task_name) }
    end
  end
end

trace(*strings) click to toggle source

 
               # File rake/application.rb, line 319
def trace(*strings)
  options.trace_output ||= $stderr
  trace_on(options.trace_output, *strings)
end

truncate(string, width) click to toggle source

 
               # File rake/application.rb, line 301
def truncate(string, width)
  if string.nil?
    ""
  elsif string.length <= width
    string
  else
    ( string[0, width-3] || "" ) + "..."
  end
end

truncate_output?() click to toggle source

We will truncate output if we are outputting to a TTY or if we’ve been given an explicit column width to honor

 
               # File rake/application.rb, line 231
def truncate_output?
  tty_output? || @terminal_columns.nonzero?
end

tty_output=( tty_output_state ) click to toggle source

Override the detected TTY output state (mostly for testing)

 
               # File rake/application.rb, line 225
def tty_output=( tty_output_state )
  @tty_output = tty_output_state
end

tty_output?() click to toggle source

True if we are outputting to TTY, false otherwise

 
               # File rake/application.rb, line 220
def tty_output?
  @tty_output
end

unix?() click to toggle source

 
               # File rake/application.rb, line 293
def unix?
  RbConfig::CONFIG['host_os'] =~ /(aix|darwin|linux|(net|free|open)bsd|cygwin|solaris|irix|hpux)/
end

windows?() click to toggle source

 
               # File rake/application.rb, line 297
def windows?
  Win32.windows?
end

Commenting is here to help enhance the documentation. For example, code samples, or clarification of the documentation.

If you have questions about Ruby or the documentation, please post to one of the Ruby mailing lists. You will get better, faster, help that way.

If you wish to post a correction of the docs, please do so, but also file bug report so that it can be corrected for the next release. Thank you.

If you want to help improve the Ruby documentation, please see Improve the docs, or visit Documenting-ruby.org.

Home Classes Methods

In Files

Parent

Methods

Included Modules

Class/Module Index

Rake::Application

Constants

Attributes

Public Class Methods

Public Instance Methods