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Module: Rake::TaskManager

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

Overview

The TaskManager module is a mixin for managing tasks.

Instance Attribute Summary

Instance Method Summary

Instance Attribute Details

#last_comment (readonly)

Alias for #last_description.

[ GitHub ]

  
# File 'lib/rake/task_manager.rb', line 10

alias :last_comment :last_description # :nodoc: Backwards compatibility

#last_description (rw) Also known as: #last_comment

Track the last comment made in the Rakefile.

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# 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.

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# File 'lib/rake/task_manager.rb', line 57

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}'"
end

#add_location(task) (private)

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

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# File 'lib/rake/task_manager.rb', line 218

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 248

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.

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# File 'lib/rake/task_manager.rb', line 159

def clear
  @tasks.clear
  @rules.clear
end

#current_scope

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

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# File 'lib/rake/task_manager.rb', line 199

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 129

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 225

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 236

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 298

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.

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# File 'lib/rake/task_manager.rb', line 205

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.

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# File 'lib/rake/task_manager.rb', line 52

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 169

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 185

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 270

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].

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# File 'lib/rake/task_manager.rb', line 72

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 89

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 145

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 151

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