From: Mike Woodhouse <mikewoodhouse@...>
Date: 2008-05-19T01:55:03+09:00
Subject: Rake 0.8.1 command line parameter problem?

This could be just me and my ignorance,  but I can't seem to figure it
out. I've been playing with the new command-line parameters feature in
Rake 0.8.1 (for which I give much thanks, btw - setting those
environment variables was getting tedious).

SImplifying, I have these:

task :q do
  puts 'q'
end

task :p => :q do
  puts 'p'
end

task :r, :x do |t, args|
  puts args.x
end

which I invoke with the following, all of which behave as I expect:
rake q
rake p
rake r[a]

But for the life of me, I can't figure out how to specify a task that
takes arguments and has a dependency - this:

task :s , :x => :q do |t, args|
  puts args.x
end

...looks like the most likely form of the many I've tried, but it also
fails:
rake aborted!
Don't know how to build task ''

Switching on trace gets me this

c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1634:in `[]'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:516:in
`invoke_prerequisites'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1183:in `each'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1183:in `send'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1183:in `each'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:515:in
`invoke_prerequisites'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:507:in
`invoke_with_call_chain'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:501:in
`synchronize'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:501:in
`invoke_with_call_chain'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:494:in `invoke'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1931:in
`invoke_task'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1909:in
`top_level'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1909:in `each'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1909:in
`top_level'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1948:in
`standard_exception_handling'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1903:in
`top_level'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1881:in `run'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1948:in
`standard_exception_handling'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1878:in `run'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/bin/rake:31
c:/ruby/bin/rake:16:in `load'
c:/ruby/bin/rake:16

If I'm being dumb, please educate me! If there's a better place to
post this, and I couldn't find one, please let me know. And if it
should be a bug (I'll keep working on understanding what's happening
in the meantime), then at least I'll know someone's now aware of it...

Thanks.

Mike