[ruby-core:98910] [Ruby master Feature#16972] Pathname#mkpath to accept block to call on each created directory

Issue #16972 has been updated by Dan0042 (Daniel DeLorme).


Thanks for the tip; all these years and I never realized `FileUtils.mkdir_p` had this `mode:` argument.
I can _imagine_ use cases for this generic solution: chown, chgrp, touch index.html
And in general I think it's better design to have generic/basic building blocks that can be combined in flexible ways.
But I have not personally experienced a need other than chmod, so for my case `FileUtils.mkdir_p` is enough.

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Feature #16972: Pathname#mkpath to accept block to call on each created directory
https://bugs.ruby-lang.org/issues/16972#change-86291

* Author: Dan0042 (Daniel DeLorme)
* Status: Assigned
* Priority: Normal
* Assignee: akr (Akira Tanaka)
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I just had a case where I need to set the permissions on each directory created by `Pathname#mkpath`, but since this requires to know which directories are created I had to reimplement the `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` allowed this

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




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