From: James Byrne <byrnejb@...>
Date: 2006-02-22T23:48:33+09:00
Subject: A small refractory problem

I have this code:

  def move(sourcedir,globspec,targetdir,suf=nil)

    if sourcedir.kindof?(self.class) then sourcedir = sourcedir.path end
    sourcedir = File.expand_path(sourcedir.to_s)
    if !self.validpath?(sourcedir) then
      raise ArgumentError, "Source directory invalid", caller
    end

    if targetdir.kindof?(self.class) then targetdir = targetdir.path end
    targetdir = File.expand path(targetdir.to_s)
    if !self.validpath?(targetdir) then
      raise ArgumentError, "Target directory invalid", caller
    end

I would like reduce the duplicate statements into a single block 
iterated over for source and target.  But I lack the ruby syntax 
knowledge to determine how best to go about this.  I would appreciate 
some examples of how this could be done using an array or a hash and 
possibly employing symbols. source and target can be an object of the 
same class or something that can meaningfully converted into a string 
containing a directory path.

I must say that the test/unit approach to programming is, if anything, 
understated in its effectiveness.  I am simply astonished at how easy 
that the test first approach makes programming and how simple the 
test/unit framework makes testing first work with ruby.  For example, 
code above was created to deal with a situation that test/unit testing 
uncovered and which would have been very difficult to track down had the 
code gotten into production.

Regards,
Jim

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