Implement KeyError checker

[ksss]

I try experimental implementation of catch the KeyError.

hash = {foo: 1, bar: 2, baz: 3}
hash.fetch(:fooo)
# KeyError: key not found: :fooo
# Did you mean?  :foo

[yuki24]

I'd prefer the following over #prepend_features:

KeyError.prepend DidYouMean::Correctable

[ksss]

Sounds cool

[ksss]

Thank you for your kind reply.
I fixed code and rebased commit.

[yuki24]

I don't think it makes sense to let KeyNameChecker inherit from MethodNameChecker since KeyError doesn't behave like NameError. It can just include SpellCheckable and implement what is needed.

[ksss]

I misunderstood about "abstracted away".
I'll implement KeyNameChecker again.

[ksss]

I rebased again.
How about this?

[yuki24]

We don't need a module then.

KeyError.send(:attr, :name, :keys)

[ksss]

Right.

[ksss]

I have a question.

Can we remove this library backtrace?

test.rb

#! /usr/bin/env ruby

require 'did_you_mean'
require 'did_you_mean/extra_features'

{foo: 1}.fetch(:ffo)

expect

$ bundle ex ruby test.rb
test.rb:6:in `<main>': `fetch': key not found: :ffo (KeyError)
Did you mean?  :foo

actual

$ bundle ex ruby test.rb
*/did_you_mean/lib/did_you_mean/extra_features/key_error.rb:5:in `fetch': key not found: :ffo (KeyError)
Did you mean?  :foo
    from */did_you_mean/lib/did_you_mean/extra_features/key_error.rb:5:in `fetch'
    from test.rb:6:in `<main>'

[kunitoo]

I think really good pull request.
I expect to similar behavior also for Hash#fetch_values and ENV.fetch.
What do you think?

test.rb

#! /usr/bin/env ruby

require 'did_you_mean'
require 'did_you_mean/extra_features'

{foo: 1}.fetch_values(:ffo)

expect

$ bundle exec ruby test.rb
test.rb:6:in `fetch_values': key not found: :ffo (KeyError)
Did you mean?  :foo

actual

$ bundle exec ruby test.rb
`fetch_values': key not found: :ffo (KeyError)
        from test.rb:6:in `<main>'

[ksss]

I think need core help to support all methods that raise KeyError.
I proposed this https://bugs.ruby-lang.org/issues/12063

[kunitoo]

Thank you for answer 😄
I understand the current situation.

[ksss]

I have solved the problem that remove self file backtrace at ksss@7314d4e .

[yuki24]

would be interesting to say Did you mean? :foo (the symbol) when "foo" (the string) is passed.

[yuki24]

@ksss I'll merge this pull request once it's rebased.

[yuki24]

manually merged: 842b1e1, 3be5dca. Thank you for your contribution!

[ksss]

Thank you so much!