[ruby-core:105273] [Ruby master Feature#17295] Feature: Create a directory and file with Pathname#touch

Issue #17295 has been updated by Dan0042 (Daniel DeLorme).


In the end I agree that `touch` is enough and `ensure_parent_dir_exists` is unnecessary (even with a shorter name). Even though creating the file via "touch" is kinda  redundant before `open('a')` it's not really a problem either.

schneems (Richard Schneeman) wrote in #note-5:
> I explored what it would look like to support all kwargs and wrote it up. It ended up being a little involved: https://gist.github.com/schneems/681a42ee54aa91a2185f49556469b319.

The `nocreate` option is intended to update the timestamp on an existing file. It's like "noop if file doesn't exist". So in the case the file doesn't exist, IMHO it shouldn't create the directories either.


----------------------------------------
Feature #17295: Feature: Create a directory and file with Pathname#touch
https://bugs.ruby-lang.org/issues/17295#change-93684

* Author: schneems (Richard Schneeman)
* Status: Assigned
* Priority: Normal
* Assignee: akr (Akira Tanaka)
----------------------------------------


Right now if a developer wants to create a file and is not sure if the path exists yet or not they must:

```ruby
Pathname.new("/a/b/c/d.txt").tap {|p| p.dirname.mkpath; FileUtils.touch(p)}
```

After this patch a developer can instead call:

```ruby
Pathname.new("/a/b/c/d.txt").touch
```

An alternative name for this behavior could be `mkfile` but I think it is confusing to have a `mkfile` and a `mkpath` where one creates a directory and one creates a file.

Diff:

```
$ git diff master
diff --git a/ext/pathname/lib/pathname.rb b/ext/pathname/lib/pathname.rb
index e6fb90277d..2ed02a6633 100644
--- a/ext/pathname/lib/pathname.rb
+++ b/ext/pathname/lib/pathname.rb
@@ -585,6 +585,27 @@ def mkpath
     nil
   end

+  # Creates a file and the full path to the file including any intermediate directories that don't yet
+  # exist.
+  #
+  # Example:
+  #
+  #   Dir.exist?("/a/b/c") # => false
+  #
+  #   p = Pathname.new("/a/b/c/d.txt")
+  #   p.file? => false
+  #   p.touch
+  #   p.file? => true
+  #
+  #   Dir.exist?("/a/b/c") # => true
+  def touch
+    require 'fileutils'
+    dirname.mkpath
+
+    FileUtils.touch(self)
+    self
+  end
+
   # Recursively deletes a directory, including all directories beneath it.
   #
   # See FileUtils.rm_r
diff --git a/test/pathname/test_pathname.rb b/test/pathname/test_pathname.rb
index 43cef4849f..3c518cc3da 100644
--- a/test/pathname/test_pathname.rb
+++ b/test/pathname/test_pathname.rb
@@ -1394,6 +1394,14 @@ def test_mkpath
     }
   end

+  def test_touch
+    with_tmpchdir('rubytest-pathname') {|dir|
+      Pathname("a/b/c/d.txt").touch
+      assert_file.directory?("a/b/c")
+      assert_file.file?("a/b/c/d.txt")
+    }
+  end
+
   def test_rmtree
     with_tmpchdir('rubytest-pathname') {|dir|
       Pathname("a/b/c/d").mkpath
```


Github link: https://github.com/ruby/ruby/pull/3706





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