[rake] rule with regex executed twice for same matching string

ruby-talk
1

Does anyone know why this rule is executed twice?

$ cat rakefile
task :default => "foo"

deps = [proc {"bar"}, proc {"barney"}]
rule /^foo$/ => deps

rule /^bar$/ do |t|
   puts t.name
end

$ rake --trace
(in /home/vjoel/tmp/raketest)
** Invoke default (first_time)
** Invoke foo (first_time)
** Invoke bar (first_time)
** Execute bar
bar
** Execute foo

···

*

--
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407

2

This seems to be a bug in rake. It affects rules with multiple prerequisites (but only if at least one prerequisite after the first is a rule).

Here's a patch against the current rake gem version, 0.7.1:

$ diff -u rake.rb.bck rake.rb
--- rake.rb.bck 2006-11-10 12:11:32.000000000 -0800
+++ rake.rb 2006-11-10 12:11:32.000000000 -0800
@@ -1566,7 +1566,7 @@
        prereqs = sources.collect { |source|
         if File.exist?(source) || Rake::Task.task_defined?(source)
           source
- elsif parent = enhance_with_matching_rule(sources.first, level+1)
+ elsif parent = enhance_with_matching_rule(source, level+1)
           parent.name
         else
           return nil

Joel VanderWerf wrote:

···

Does anyone know why this rule is executed twice?

$ cat rakefile
task :default => "foo"

deps = [proc {"bar"}, proc {"barney"}]
rule /^foo$/ => deps

rule /^bar$/ do |t|
  puts t.name
end

$ rake --trace
(in /home/vjoel/tmp/raketest)
** Invoke default (first_time)
** Invoke foo (first_time)
** Invoke bar (first_time)
** Execute bar
bar
** Execute foo
*

--
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407