attempt_rule(task_name, extensions, block, level)
private
Attempt to create a rule given the list of prerequisites.
# File lib/rake/task_manager.rb, line 245
def attempt_rule(task_name, extensions, block, level)
sources = make_sources(task_name, extensions)
prereqs = sources.collect { |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 => prereqs}, &block)
task.sources = prereqs
task
end