module Rake::TaskManager

The TaskManager module is a mixin for managing tasks.

Attributes

record_task_metadata[RW]

last_comment[RW]

Track the last comment made in the Rakefile.

last_description[RW]

Track the last comment made in the Rakefile.

Public Class Methods

new() click to toggle source

Calls superclass method

# File lib/rake/task_manager.rb, line 9
def initialize
  super
  @tasks = Hash.new
  @rules = Array.new
  @scope = Scope.make
  @last_description = nil
end

Public Instance Methods

[](task_name, scopes=nil) click to toggle source

Find a matching task for task_name.

# File lib/rake/task_manager.rb, line 44
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

clear() click to toggle source

Clear all tasks in this application.

# File lib/rake/task_manager.rb, line 146
def clear
  @tasks.clear
  @rules.clear
end

create_rule(*args, &block) click to toggle source

# File lib/rake/task_manager.rb, line 17
def create_rule(*args, &block)
  pattern, args, deps = resolve_args(args)
  pattern = Regexp.new(Regexp.quote(pattern) + '$') if String === pattern
  @rules << [pattern, args, deps, block]
end

current_scope() click to toggle source

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

# File lib/rake/task_manager.rb, line 186
def current_scope
  @scope
end

define_task(task_class, *args, &block) click to toggle source

# File lib/rake/task_manager.rb, line 23
def define_task(task_class, *args, &block)
  task_name, arg_names, deps = resolve_args(args)
  task_name = task_class.scope_name(@scope, task_name)
  deps = [deps] unless deps.respond_to?(:to_ary)
  deps = deps.map { |d| d.to_s }
  task = intern(task_class, task_name)
  task.set_arg_names(arg_names) unless arg_names.empty?
  if Rake::TaskManager.record_task_metadata
    add_location(task)
    task.add_description(get_description(task))
  end
  task.enhance(deps, &block)
end

enhance_with_matching_rule(task_name, level=0) click to toggle source

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.

# File lib/rake/task_manager.rb, line 116
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

in_namespace(name) { |ns| ... } click to toggle source

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

# File lib/rake/task_manager.rb, line 192
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) click to toggle source

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

# File lib/rake/task_manager.rb, line 39
def intern(task_class, task_name)
  @tasks[task_name.to_s] ||= task_class.new(task_name, self)
end

lookup(task_name, initial_scope=nil) click to toggle source

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.

# File lib/rake/task_manager.rb, line 156
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

resolve_args(args) click to toggle source

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

# File lib/rake/task_manager.rb, line 59
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

synthesize_file_task(task_name) click to toggle source

# File lib/rake/task_manager.rb, line 52
def synthesize_file_task(task_name)
  return nil unless File.exist?(task_name)
  define_task(Rake::FileTask, task_name)
end

tasks() click to toggle source

List of all defined tasks in this application.

# File lib/rake/task_manager.rb, line 132
def tasks
  @tasks.values.sort_by { |t| t.name }
end

tasks_in_scope(scope) click to toggle source

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

# File lib/rake/task_manager.rb, line 138
def tasks_in_scope(scope)
  prefix = scope.path
  tasks.select { |t|
    /^#{prefix}:/ =~ t.name
  }
end

Private Instance Methods

add_location(task) click to toggle source

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

# File lib/rake/task_manager.rb, line 205
def add_location(task)
  loc = find_location
  task.locations << loc if loc
  task
end

attempt_rule(task_name, args, extensions, block, level) click to toggle source

Attempt to create a rule given the list of prerequisites.

# File lib/rake/task_manager.rb, line 235
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

find_location() click to toggle source

Find the location that called into the dsl layer.

# File lib/rake/task_manager.rb, line 212
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() click to toggle source

Generate an anonymous namespace name.

# File lib/rake/task_manager.rb, line 223
def generate_name
  @seed ||= 0
  @seed += 1
  "_anon_#{@seed}"
end

get_description(task) click to toggle source

Return the current description, clearing it in the process.

# File lib/rake/task_manager.rb, line 285
def get_description(task)
  desc = @last_description
  @last_description = nil
  desc
end

lookup_in_scope(name, scope) click to toggle source

Lookup the task name

# File lib/rake/task_manager.rb, line 172
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) click to toggle source

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

# File lib/rake/task_manager.rb, line 257
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
      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_without_dependencies(args) click to toggle source

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]

# File lib/rake/task_manager.rb, line 76
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

trace_rule(level, message) click to toggle source

# File lib/rake/task_manager.rb, line 229
def trace_rule(level, message)
  options.trace_output.puts "#{"    " * level}#{message}" if
    Rake.application.options.trace_rules
end