Module: Rake::TaskManager

Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Included In: Application
Defined in:	lib/rake/task_manager.rb

Overview

The TaskManager module is a mixin for managing tasks.

Instance Attribute Summary

#last_description rw

Track the last comment made in the Rakefile.

Instance Method Summary

#[](task_name, scopes = nil)

Find a matching task for task_name.
#clear

Clear all tasks in this application.
#current_scope

Return the list of scope names currently active in the task manager.
#enhance_with_matching_rule(task_name, level = 0)

If a rule can be found that matches the task name, enhance the task with the prerequisites and actions from the rule.
#in_namespace(name)

Evaluate the block in a nested namespace named name.
#intern(task_class, task_name)

Lookup a task.
#lookup(task_name, initial_scope = nil)

Lookup a task, using scope and the scope hints in the task name.
#resolve_args(args)

Resolve the arguments for a task/rule.
#tasks

List of all defined tasks in this application.
#tasks_in_scope(scope)

List of all the tasks defined in the given scope (and its sub-scopes).
#add_location(task) private

Add a location to the locations field of the given task.
#attempt_rule(task_name, args, extensions, block, level) private

Attempt to create a rule given the list of prerequisites.
#find_location private

Find the location that called into the dsl layer.
#generate_name private

Generate an anonymous namespace name.
#get_description(task) private

Return the current description, clearing it in the process.
#lookup_in_scope(name, scope) private

Lookup the task name.
#make_sources(task_name, extensions) private

Make a list of sources from the list of file name extensions / translation procs.
#resolve_args_without_dependencies(args) private

Resolve task arguments for a task or rule when there are no dependencies declared.

Instance Attribute Details

#last_description (rw)

Track the last comment made in the Rakefile.

[ GitHub ]

# File 'lib/rake/task_manager.rb', line 6


attr_accessor :last_description

Instance Method Details

#[](task_name, scopes = nil)

Find a matching task for task_name.

[ GitHub ]

# File 'lib/rake/task_manager.rb', line 53


def [](task_name, scopes=nil)
  task_name = task_name.to_s
  self.lookup(task_name, scopes) or
    enhance_with_matching_rule(task_name) or
    synthesize_file_task(task_name) or
    fail "Don't know how to build task '#{task_name}' (see --tasks)"
end

#add_location(task) (private)

Add a location to the locations field of the given task.

[ GitHub ]

# File 'lib/rake/task_manager.rb', line 214


def add_location(task)
  loc = find_location
  task.locations << loc if loc
  task
end

#attempt_rule(task_name, args, extensions, block, level) (private)

Attempt to create a rule given the list of prerequisites.

[ GitHub ]

# File 'lib/rake/task_manager.rb', line 244


def attempt_rule(task_name, args, extensions, block, level)
  sources = make_sources(task_name, extensions)
  prereqs = sources.map { |source|
    trace_rule level, "Attempting Rule #{task_name} => #{source}"
    if File.exist?(source) || Rake::Task.task_defined?(source)
      trace_rule level, "(#{task_name} => #{source} ... EXIST)"
      source
    elsif parent = enhance_with_matching_rule(source, level + 1)
      trace_rule level, "(#{task_name} => #{source} ... ENHANCE)"
      parent.name
    else
      trace_rule level, "(#{task_name} => #{source} ... FAIL)"
      return nil
    end
  }
  task = FileTask.define_task(task_name, { args => prereqs }, &block)
  task.sources = prereqs
  task
end

#clear

Clear all tasks in this application.

[ GitHub ]

# File 'lib/rake/task_manager.rb', line 155


def clear
  @tasks.clear
  @rules.clear
end

#current_scope

Return the list of scope names currently active in the task manager.

[ GitHub ]

# File 'lib/rake/task_manager.rb', line 195


def current_scope
  @scope
end

#enhance_with_matching_rule(task_name, level = 0)

If a rule can be found that matches the task name, enhance the task with the prerequisites and actions from the rule. Set the source attribute of the task appropriately for the rule. Return the enhanced task or nil of no rule was found.

[ GitHub ]

# File 'lib/rake/task_manager.rb', line 125


def enhance_with_matching_rule(task_name, level=0)
  fail Rake::RuleRecursionOverflowError,
    "Rule Recursion Too Deep" if level >= 16
  @rules.each do |pattern, args, extensions, block|
    if pattern.match(task_name)
      task = attempt_rule(task_name, args, extensions, block, level)
      return task if task
    end
  end
  nil
rescue Rake::RuleRecursionOverflowError => ex
  ex.add_target(task_name)
  fail ex
end

#find_location (private)

Find the location that called into the dsl layer.

[ GitHub ]

# File 'lib/rake/task_manager.rb', line 221


def find_location
  locations = caller
  i = 0
  while locations[i]
    return locations[i + 1] if locations[i] =~ /rake\/dsl_definition.rb/
    i += 1
  end
  nil
end

#generate_name (private)

Generate an anonymous namespace name.

[ GitHub ]

# File 'lib/rake/task_manager.rb', line 232


def generate_name
  @seed ||= 0
  @seed += 1
  "_anon_#{@seed}"
end

#get_description(task) (private)

Return the current description, clearing it in the process.

[ GitHub ]

# File 'lib/rake/task_manager.rb', line 291


def get_description(task)
  desc = @last_description
  @last_description = nil
  desc
end

#in_namespace(name)

Evaluate the block in a nested namespace named name. Create an anonymous namespace if name is nil.

[ GitHub ]

# File 'lib/rake/task_manager.rb', line 201


def in_namespace(name)
  name ||= generate_name
  @scope = Scope.new(name, @scope)
  ns = NameSpace.new(self, @scope)
  yield(ns)
  ns
ensure
  @scope = @scope.tail
end

#intern(task_class, task_name)

Lookup a task. Return an existing task if found, otherwise create a task of the current type.

[ GitHub ]

# File 'lib/rake/task_manager.rb', line 48


def intern(task_class, task_name)
  @tasks[task_name.to_s] ||= task_class.new(task_name, self)
end

#lookup(task_name, initial_scope = nil)

Lookup a task, using scope and the scope hints in the task name. This method performs straight lookups without trying to synthesize file tasks or rules. Special scope names (e.g. '^') are recognized. If no scope argument is supplied, use the current scope. Return nil if the task cannot be found.

[ GitHub ]

# File 'lib/rake/task_manager.rb', line 165


def lookup(task_name, initial_scope=nil)
  initial_scope ||= @scope
  task_name = task_name.to_s
  if task_name =~ /^rake:/
    scopes = Scope.make
    task_name = task_name.sub(/^rake:/, "")
  elsif task_name =~ /^(\^+)/
    scopes = initial_scope.trim($1.size)
    task_name = task_name.sub(/^(\^+)/, "")
  else
    scopes = initial_scope
  end
  lookup_in_scope(task_name, scopes)
end

#lookup_in_scope(name, scope) (private)

Lookup the task name

[ GitHub ]

# File 'lib/rake/task_manager.rb', line 181


def lookup_in_scope(name, scope)
  loop do
    tn = scope.path_with_task_name(name)
    task = @tasks[tn]
    return task if task
    break if scope.empty?
    scope = scope.tail
  end
  nil
end

#make_sources(task_name, extensions) (private)

Make a list of sources from the list of file name extensions / translation procs.

[ GitHub ]

# File 'lib/rake/task_manager.rb', line 266


def make_sources(task_name, extensions)
  result = extensions.map { |ext|
    case ext
    when /%/
      task_name.pathmap(ext)
    when %r{/}
      ext
    when /^\./
      task_name.ext(ext)
    when String
      ext
    when Proc, Method
      if ext.arity == 1
        ext.call(task_name)
      else
        ext.call
      end
    else
      fail "Don't know how to handle rule dependent: #{ext.inspect}"
    end
  }
  result.flatten
end

#resolve_args(args)

Resolve the arguments for a task/rule. Returns a triplet of [task_name, arg_name_list, prerequisites].

[ GitHub ]

# File 'lib/rake/task_manager.rb', line 68


def resolve_args(args)
  if args.last.is_a?(Hash)
    deps = args.pop
    resolve_args_with_dependencies(args, deps)
  else
    resolve_args_without_dependencies(args)
  end
end

#resolve_args_without_dependencies(args) (private)

Resolve task arguments for a task or rule when there are no dependencies declared.

The patterns recognized by this argument resolving function are:

task :t
task :t, [:a]

[ GitHub ]

# File 'lib/rake/task_manager.rb', line 85


def resolve_args_without_dependencies(args)
  task_name = args.shift
  if args.size == 1 && args.first.respond_to?(:to_ary)
    arg_names = args.first.to_ary
  else
    arg_names = args
  end
  [task_name, arg_names, []]
end

#tasks

List of all defined tasks in this application.

[ GitHub ]

# File 'lib/rake/task_manager.rb', line 141


def tasks
  @tasks.values.sort_by { |t| t.name }
end

#tasks_in_scope(scope)

List of all the tasks defined in the given scope (and its sub-scopes).

[ GitHub ]

# File 'lib/rake/task_manager.rb', line 147


def tasks_in_scope(scope)
  prefix = scope.path
  tasks.select { |t|
    /^#{prefix}:/ =~ t.name
  }
end