From: matt@... (matt neuburg)
Date: 2008-04-28T07:00:04+09:00
Subject: Re: Getting Mac file paths from disk...

matt neuburg <matt@tidbits.com> wrote:

> Vincent Angeloni <nospam7272@mac.com> wrote:
> 
> > So when this finds a Numbers file, the result it gives is:
> > 
> > ../filesizeTest/401k allocation.numbers
> > ../filesizeTest/401k allocation.numbers/QuickLook
> > ../filesizeTest/401k allocation.numbers/QuickLook/Thumbnail.jpg
> > ../filesizeTest/401k allocation.numbers/index.xml.gz
> > ../filesizeTest/401k allocation.numbers/document-thumbnail.tiff
> > ../filesizeTest/401k allocation.numbers/Contents
> > ../filesizeTest/401k allocation.numbers/Contents/PkgInfo
> > 
> > I understand why this is happening (bundles and packages are folders
> > which the Mac OS treats like a file, but Ruby does not know about
> > this). The only "easy" solution that I can see to this is to use
> > rb-appscript and get the folder contents using Applescript (which
> > presumably *would* know to treat a package/bundle app as a file,
> > not a folder). I haven't tried this yet, and if anyone has, let
> > me know if it works!
> > 
> > Has anyone else dealt with this problem and, if so, what solution
> > did you use?
> 
> The Finder uses a number of different criteria to determine whether a
> folder should be portrayed to the user as a file:
> 
> >  The directory has a known extension: .app, .bundle, .framework,
> > .plugin, .kext, and so on.
> >  The directory has its bundle bit set.
> >  The directory has a known structure type indicating it is a modern or
> > versioned bundle.
> 
> You wouldn't want to have to perform all those tests yourself, so the
> simplest thing is to use an API that can perform them for you. Your
> choice of rb-appscript and AppleScript is therefore a sensible one. Your
> code will probably look something like this:
> 
> require 'rubygems'
> require "osax"
> 
> sa = OSAX::ScriptingAddition.new("StandardAdditions")
> 
> f = "/Users/mattneub/Desktop/newXcodeNotes.tao1"
> h = sa.info_for(MacTypes::FileURL.path(f))
> puts h[:package_folder] #=> true
> 
> f2 = "/Users/mattneub/Desktop/gcsc backups"
> h = sa.info_for(MacTypes::FileURL.path(f2))
> puts h[:package_folder] #=> false
> 
> Hope this helps - Of course if there's an installed Unix tool that does
> the same job, then you could use that, but I don't happen to know of
> one... m.

Sorry - I should have added that the obvious implementation here would
be as part of something like the File class:

class File
  require 'rubygems'
  require "osax"
  SA = OSAX::ScriptingAddition.new("StandardAdditions")
  
  def self.bundle?(f)
    return false unless directory?(f)
    return SA.info_for(MacTypes::FileURL.path(f))[:package_folder]
  end
end

The following all get the right answer OMM:

f = "/Users/mattneub/Desktop/newXcodeNotes.tao1" # like .numbers
puts File.bundle?(f)
f2 = "/Users/mattneub/Desktop/gcsc backups" # just a folder
puts File.bundle?(f2)
f3 = "/Users/mattneub/Desktop/ReMate.tgz" # just a folder
puts File.bundle?(f3)
f4 = "/Users/mattneub/Desktop/nonexistent" # just a mistake
puts File.bundle?(f4)

m.

-- 
matt neuburg, phd = matt@tidbits.com, http://www.tidbits.com/matt/
Leopard - http://www.takecontrolbooks.com/leopard-customizing.html
AppleScript - http://www.amazon.com/gp/product/0596102119
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