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module Rake
# The TaskManager module is a mixin for managing tasks.
module TaskManager
# Track the last comment made in the Rakefile.
attr_accessor :last_description
alias :last_comment :last_description # Backwards compatibility
def initialize
super
@tasks = Hash.new
@rules = Array.new
@scope = Scope.make
@last_description = nil
end
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
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
# Lookup a task. Return an existing task if found, otherwise
# create a task of the current type.
def intern(task_class, task_name)
@tasks[task_name.to_s] ||= task_class.new(task_name, self)
end
# Find a matching task for +task_name+.
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
def synthesize_file_task(task_name)
return nil unless File.exist?(task_name)
define_task(Rake::FileTask, task_name)
end
# Resolve the arguments for a task/rule. Returns a triplet of
# [task_name, arg_name_list, prerequisites].
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 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]
#
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
private :resolve_args_without_dependencies
# Resolve task arguments for a task or rule when there are
# dependencies declared.
#
# The patterns recognized by this argument resolving function are:
#
# task :t => [:d]
# task :t, [a] => [:d]
#
def resolve_args_with_dependencies(args, hash) # :nodoc:
fail "Task Argument Error" if hash.size != 1
key, value = hash.map { |k, v| [k, v] }.first
if args.empty?
task_name = key
arg_names = []
deps = value
else
task_name = args.shift
arg_names = key
deps = value
end
deps = [deps] unless deps.respond_to?(:to_ary)
[task_name, arg_names, deps]
end
private :resolve_args_with_dependencies
# 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.
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
# List of all defined tasks in this application.
def tasks
@tasks.values.sort_by { |t| t.name }
end
# List of all the tasks defined in the given scope (and its
# sub-scopes).
def tasks_in_scope(scope)
prefix = scope.path
tasks.select { |t|
/^#{prefix}:/ =~ t.name
}
end
# Clear all tasks in this application.
def clear
@tasks.clear
@rules.clear
end
# 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.
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 the task name
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
private :lookup_in_scope
# Return the list of scope names currently active in the task
# manager.
def current_scope
@scope
end
# Evaluate the block in a nested namespace named +name+. Create
# an anonymous namespace if +name+ is nil.
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
private
# Add a location to the locations field of the given task.
def add_location(task)
loc = find_location
task.locations << loc if loc
task
end
# Find the location that called into the dsl layer.
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 an anonymous namespace name.
def generate_name
@seed ||= 0
@seed += 1
"_anon_#{@seed}"
end
def trace_rule(level, message)
options.trace_output.puts "#{" " * level}#{message}" if
Rake.application.options.trace_rules
end
# Attempt to create a rule given the list of prerequisites.
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
# Make a list of sources from the list of file name extensions /
# translation procs.
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
private
# Return the current description, clearing it in the process.
def get_description(task)
desc = @last_description
@last_description = nil
desc
end
class << self
attr_accessor :record_task_metadata
TaskManager.record_task_metadata = false
end
end
end