Bump Active Support dependency to version >= 2

[JuanitoFatas]

Closes #252

This Pull Request unlocks Active Support dependency to >= 2, so that App used HTML::Pipeline can upgrade to Rails 5.

Changes

• [x] Setup Test Matrix with thoughtbot/appraisal ea9a723
• [x] Avoid the use of try because Rails 3 behavior breaks 788a2da
• [x] Only pack necessary file to released gem 7925b72

  Appraisal Usage

• Run tests with Rails 3: $ appraisal rails-3 rake
• Run tests with Rails 4: $ appraisal rails-4 rake
• Run tests with Rails 5: $ appraisal rails-5 rake
• Run above all combined: $ appraisal rake

  Exclude builds

• Rails 5 required Ruby version is 2.2.2, so exclude Ruby version < 2.2.2 build with Rails 5.

  Allowed Failures

ruby-head is nice to pass, but failed is fine.

Test with Rails 5 apps

HTML::Pipeline works great with these Rails 5.0.0 apps:

• JuanitoFatas/markdown, Build Result
• RedDotRubyConf/rdrc2016, Build Result
• Thredded reported running on Rails 5 without problems

[JuanitoFatas]

@jch @simeonwillbanks 👍 ?

[jch]

Sorry, I haven't had a chance to test this on Rails 5 yet. In addition to the tests, has this been used in a production app yet? We're still using a patched version of Rails 3 and moving towards 4.

[JuanitoFatas]

has this been used in a production app yet?

Yes, the RedDotRubyConf webiste uses HTML::Pipeline. And I created a Rails 5 app with some specs.

For tests: I can setup a test suite with https://github.com/thoughtbot/appraisal. But I am also thinking create some real apps and put them under github.com/html-pipeline organization, what do you think?

[JuanitoFatas]

@jch Please review and 🚢:shipit::heart:

[bdewater]

Instead of allow_failures for Rails 5 and Ruby versions < 2.2.2, use exclude to save CPU time on Travis.

[JuanitoFatas]

Instead of allow_failures for Rails 5 and Ruby versions < 2.2.2, use exclude to save CPU time on Travis.

Thanks Bart! ❤️ Updated .travis.yml in a31fa29.

[glebm]

has this been used in a production app yet?

Also now running on https://thredded.org/ with Rails 5.0.0 and this PR as of this comment.

[n-rodriguez]

hi there! any news?

[parkr]

@jch Just so you know, this has caused muchas problemas for systems using Ruby < 2.2.2, which isn't smart enough to install activesupport v4.x:

• https://travis-ci.org/github/pages-gem/builds/144818057
• https://travis-ci.org/github/pages-gem/builds/144818070
• https://github.com/jekyll/jekyll/pull/5100
• https://travis-ci.org/jekyll/jekyll/jobs/144208193#L465
• https://github.com/jekyll/jemoji/issues/46
• https://github.com/jekyll/jekyll-mentions/issues/36
• ... etc

[jch]

@parkr good catch. This has been a frustration each time html-pipeline upgrades it's dependencies be because of it's loose constraints on versions. I proposed splitting up the gem into smaller gems to narrow down these problems in https://github.com/jch/html-pipeline/issues/182, but did not make any changes at the time.

Could you talk more about why this is breaking for specific versions of Ruby? What workaround have you taken for it?

[parkr]

Could you talk more about why this is breaking for specific versions of Ruby?

Absolutely. The issue affects anyone installing jemoji or jekyll-mentions, two gems which rely on this gem (bindings for the emoji filter and mentions filter, respectively). When one specifies gem "jekyll-mentions" in one's Gemfile and executes bundle install, they see the error saying that activesupport 5.0.0 requires Ruby 2.2.2 or higher to install. Instead of gracefully downgrading to activesupport 4.2.7, it simply fails. The two plugins I mentioned above simply specify their dependency on html-pipeline. Neither bundler nor RubyGems for Ruby 2.1 appear to be able to gracefully downgrade a dependency until they all resolve to installable versions.

What workaround have you taken for it?

The workaround we went for is to lock down activesupport to ~> 4.0 (e.g. jekyll/jemoji#47) as it is compatible with all Ruby versions we test with (2.0, 2.1, 2.2, 2.3). I looked at the emoji filter and all activesupport is used for is HashWithIndifferentAccess. :frowning: Perhaps we could remove that dependency on the emoji filter?

[JuanitoFatas]

The workaround we went for is to lock down activesupport to ~> 4.0 (e.g. jekyll/jemoji#47) as it is compatible with all Ruby versions we test with (2.0, 2.1, 2.2, 2.3).

How about release a patch version of Jemoji that stays with Active Support 4.x and a new major version that supports Active Support 5+? 😅

I looked at the emoji filter and all activesupport is used for is HashWithIndifferentAccess. 😦 Perhaps we could remove that dependency on the emoji filter?

If we want to remove Active Support, we need to remove all usage of Active Support across the html-pipeline gem. Otherwise html-pipeline still depend on Active Support. The barrier is the use of coverting document to hash. 😓

[parkr]

How about release a patch version of Jemoji that stays with Active Support 4.x

We did this, actually. GitHub Pages uses Ruby 2.1.7 in production so we locked the downgrade and all was well.

It's not the end of the world, but there were a couple days where anyone using Ruby < 2.2.2 couldn't install this gem in our projects.

[Taher-Ghaleb]

Hello,

Sorry, I know it's been a long time ago, but I am curious why caching hasn't been enabled before this (i.e., since December 17, 2014, when it became available to open source projects).

Thank you.