gemspec: Remove test files, Gemfile from package

[f440]

This pull request updates the *.gemspec file to optimize the gem package size and structure. The changes include:

• Modified files to exclude test files, Gemfile , and CHANGELOG from the package.
• Removed the deprecated test_files specification as it is no longer recommended.

These changes reduce the extracted package size from 324 KB to 140 KB 160 KB.

Benefits:

• Shorter download times for users
• Reduced container sizes when the gem is included

References:

• Documentation about 'test_files' is confusing rubygems/guides#90
• Don't package test files with gem rubygems/bundler#3207
• Template for the *.gemspec file generated by bundle gem command

[brendon]

Thanks for this. Thanks @f440. I used bundler to create my other gem (I think!) and it has the following for files:

  spec.files = Dir.chdir(File.expand_path(__dir__)) do
    `git ls-files -z`.split("\x0").reject do |f|
      (f == __FILE__) || f.match(%r{\A(?:(?:bin|test|spec|features)/|\.(?:git|travis|circleci)|appveyor)})
    end
  end

Not including the CHANGELOG seems weird to me so I think I want to keep that in the package. That'd feel similar to not packaging docs. I also don't see them skipping Gemfile (and this is bundler generated).

Actually I just tried using bundler 2.5.15 (what I had installed) to generate a test gem and it came up with this:

spec.files = IO.popen(%w[git ls-files -z], chdir: __dir__, err: IO::NULL) do |ls|
    ls.readlines("\x0", chomp: true).reject do |f|
      (f == gemspec) ||
        f.start_with?(*%w[bin/ test/ spec/ features/ .git .github appveyor Gemfile])
    end
  end

Perhaps we should just run with that?

[f440]

Thank you for checking!

Package users typically don't check the documentation in the expanded directory. When they want to know about changes, they're more likely to look at the Changelog: https://... displayed by bundle info acts_as_list. However, I want to respect your decision.

I've incorporated your suggested content as is, with some adjustments to prevent errors.

[brendon]

Thanks @f440, definitely that'd usually be the case. Could be handy if someone finds themself offline with only the gem installation to work from but that would be rare :D I'll merge this now. Do you want a release straight away or are you happy to wait?

[f440]

Thanks for merging this! I'm ready for a release whenever you feel it's appropriate. Thank you for creating such a useful library!

[brendon]

You're most welcome :D I can't take all the credit. There have been many talented authors before me on this one :)

If you ever get the chance, check out my new positioning gem: https://github.com/brendon/positioning

I've released this as 1.2.2.