From: "nobu (Nobuyoshi Nakada)" <noreply@...>
Date: 2022-10-10T07:46:45+00:00
Subject: [ruby-core:110243] [Ruby master Feature#19045] [Proposal] Add support Data#pretty_print

Issue #19045 has been updated by nobu (Nobuyoshi Nakada).


Since `pp.rb` is a part of a default gem now, you have to consider the compatibility with older versions.

----------------------------------------
Feature #19045: [Proposal] Add support Data#pretty_print
https://bugs.ruby-lang.org/issues/19045#change-99528

* Author: osyo (manga osyo)
* Status: Open
* Priority: Normal
----------------------------------------
While trying out the `Data` library I noticed that `Data#pretty_print` is not supported.
`Data#inspect` included members, but `Data#pretty_print` does not.

```ruby
require "pp"

D = Data.define(:hoge, :foo, :bar)
data = D.new("hoge", "foo", "bar")

# Members is included
puts data.inspect
# => #<data D hoge="hoge", foo="foo", bar="bar">

# Members is not included
puts PP.pp(data, "")
# => #<data D:...>
```

Since `Struct#pretty_print` is supported, why not support `Data#pretty_print` as well.

```ruby
require "pp"

S = Struct.new(:hoge, :foo, :bar)
str = S.new("hoge", "foo", "bar")

# Supported Struct#pretty_print
puts PP.pp(str, "", 20)
# => #<struct S
#     hoge="hoge",
#     foo="foo",
#     bar="bar">
```

PR: https://github.com/ruby/ruby/pull/6521
Sample: 

```ruby
D = Data.define(:hoge, :foo, :bar)
data = D.new("hoge", "foo", "bar")

puts PP.pp(data, "", 20)
# => #<data D
#     hoge="hoge",
#     foo="foo",
#     bar="bar">
```





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