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Feature #16972

Updated by nobu (Nobuyoshi Nakada) 3 months ago

I just had a case where I need to set the permissions on each directory created by `Pathname#mkpath`, Pathname#mkpath, but since this requires to know which directories are created I had to reimplement the `mkpath` mkpath logic like this: 

 ```ruby 
 file = Pathname.new(Dir.pwd) + "a/b/c/d/e/foo.txt"    #any of these directories may already exist 

 file.dirname.ascend.take_while{ |d| !d.exist? }.reverse_each do |dir| 
   dir.mkdir 
   dir.chmod(0775) #rwxrwxr-x 
 end 
 ``` 

 It occured to me it would be very elegant if `mkpath` mkpath allowed this 

 ```ruby 
 file.dirname.mkpath{ |dir| dir.chmod(0775) } 
 ``` 

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