Add a --show command line option  that list all possible targets
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                 Key: MNG-4339
                 URL: http://jira.codehaus.org/browse/MNG-4339
             Project: Maven 2
          Issue Type: Improvement
          Components: Command Line
            Reporter: Christian Hammers
            Priority: Minor


Hello

It would be nice if maven had a "--show" command line option that could be used 
to figure out which individual targets can be called:

 $ mvn --show
 The following goals can be called directly:
   compile
   deploy
   site
        :<default>
        :javadoc
        :doxia
   jaxws
        :wsgen
        :wsimport
   ant
       :run
   release
       :prepare
       :perform
  
This would help newbies like me to figure out how I can just recreate the 
apidocs wihout haven to run "mvn site" and wait for the whole unit test to 
complete etc....

bye,

-christian-

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