Seems incompatible with Rails 5 / Sprockets 3.

[beechnut]

Subject of the issue

Fails with sprockets 3 / Rails 5.

Your environment

• version of less-rails-semantic_ui gem: 2.2.6.0
• version of Rails: 5.0.0.1

Steps to reproduce

I added the following gems to my Gemfile and ran 'bundle install'.

gem 'less-rails-semantic_ui', '~> 2.2.6.0'
gem 'autoprefixer-rails'
gem 'sprockets', '~> 2'

The sprockets versioning is from @allthesignals' fix from #21, but on a Rails 5 app I got:

Bundler could not find compatible versions for gem "sprockets":
  In Gemfile:
    sprockets (~> 2)

    less-rails-semantic_ui (~> 2.2.6.0) was resolved to 2.2.6.0, which depends on
      less-rails (< 2.8.0, >= 2.6.0) was resolved to 2.7.1, which depends on
        sprockets (< 4, > 2)

    rails (>= 5.0.0.1, ~> 5.0.0) was resolved to 5.0.0.1, which depends on
      sprockets-rails (>= 2.0.0) was resolved to 3.2.0, which depends on
        sprockets (>= 3.0.0)

Using Sprockets 3, I ran rails g semantic_ui:install and got the following error:

$ rails g semantic_ui:install
DEPRECATION WARNING: Sprockets method `register_engine` is deprecated.
Please register a mime type using `register_mime_type` then
use `register_compressor` or `register_transformer`.
https://github.com/rails/sprockets/blob/master/guides/extending_sprockets.md#supporting-all-versions-of-sprockets-in-processors
 (called from block in <class:Railtie> at /Users/matt/.rvm/gems/ruby-2.3.1@basin/gems/less-rails-2.7.1/lib/less/rails/railtie.rb:15)
DEPRECATION WARNING: You are using the a deprecated processor interface Less::Rails::ImportProcessor.
Please update your processor interface:
https://github.com/rails/sprockets/blob/master/guides/extending_sprockets.md#supporting-all-versions-of-sprockets-in-processors
 (called from block in <class:Railtie> at /Users/matt/.rvm/gems/ruby-2.3.1@basin/gems/less-rails-2.7.1/lib/less/rails/railtie.rb:20)
/Users/matt/.rvm/gems/ruby-2.3.1@basin/gems/autoprefixer-rails-2.2.0.20140804/lib/autoprefixer-rails/sprockets.rb:45:in `register': undefined method `register_postprocessor' for nil:NilClass (NoMethodError)
        from /Users/matt/.rvm/gems/ruby-2.3.1@basin/gems/autoprefixer-rails-2.2.0.20140804/lib/autoprefixer-rails/sprockets.rb:37:in `install'
        from /Users/matt/.rvm/gems/ruby-2.3.1@basin/gems/autoprefixer-rails-2.2.0.20140804/lib/autoprefixer-rails.rb:16:in `install'
        from /Users/matt/.rvm/gems/ruby-2.3.1@basin/gems/autoprefixer-rails-2.2.0.20140804/lib/autoprefixer-rails/railtie.rb:12:in `block in <class:Railtie>'
        from /Users/matt/.rvm/gems/ruby-2.3.1@basin/gems/railties-5.0.0.1/lib/rails/initializable.rb:30:in `instance_exec'
        from /Users/matt/.rvm/gems/ruby-2.3.1@basin/gems/railties-5.0.0.1/lib/rails/initializable.rb:30:in `run'
        from /Users/matt/.rvm/gems/ruby-2.3.1@basin/gems/railties-5.0.0.1/lib/rails/initializable.rb:55:in `block in run_initializers'
        from /Users/matt/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/tsort.rb:228:in `block in tsort_each'
        from /Users/matt/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/tsort.rb:350:in `block (2 levels) in each_strongly_connected_component'
        from /Users/matt/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/tsort.rb:431:in `each_strongly_connected_component_from'
        from /Users/matt/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/tsort.rb:349:in `block in each_strongly_connected_component'
        from /Users/matt/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/tsort.rb:347:in `each'
        from /Users/matt/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/tsort.rb:347:in `call'
        from /Users/matt/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/tsort.rb:347:in `each_strongly_connected_component'
        from /Users/matt/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/tsort.rb:226:in `tsort_each'
        from /Users/matt/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/tsort.rb:205:in `tsort_each'
        from /Users/matt/.rvm/gems/ruby-2.3.1@basin/gems/railties-5.0.0.1/lib/rails/initializable.rb:54:in `run_initializers'
        from /Users/matt/.rvm/gems/ruby-2.3.1@basin/gems/railties-5.0.0.1/lib/rails/application.rb:352:in `initialize!'
        from /Users/matt/Documents/repos/unrest/basin/config/environment.rb:5:in `<top (required)>'
        from /Users/matt/.rvm/gems/ruby-2.3.1@basin/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:293:in `require'matt$
        from /Users/matt/.rvm/gems/ruby-2.3.1@basin/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:293:in `block in require'
        from /Users/matt/.rvm/gems/ruby-2.3.1@basin/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:259:in `load_dependency'
        from /Users/matt/.rvm/gems/ruby-2.3.1@basin/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:293:in `require'
        from /Users/matt/.rvm/gems/ruby-2.3.1@basin/gems/spring-2.0.0/lib/spring/application.rb:92:in `preload'
        from /Users/matt/.rvm/gems/ruby-2.3.1@basin/gems/spring-2.0.0/lib/spring/application.rb:143:in `serve'
        from /Users/matt/.rvm/gems/ruby-2.3.1@basin/gems/spring-2.0.0/lib/spring/application.rb:131:in `block in run'
        from /Users/matt/.rvm/gems/ruby-2.3.1@basin/gems/spring-2.0.0/lib/spring/application.rb:125:in `loop'
        from /Users/matt/.rvm/gems/ruby-2.3.1@basin/gems/spring-2.0.0/lib/spring/application.rb:125:in `run'
        from /Users/matt/.rvm/gems/ruby-2.3.1@basin/gems/spring-2.0.0/lib/spring/application/boot.rb:19:in `<top (required)>'
        from /Users/matt/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
        from /Users/matt/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
        from -e:1:in `<main>'

I followed the link listed in the issue -- https://github.com/rails/sprockets/blob/master/guides/extending_sprockets.md#supporting-all-versions-of-sprockets-in-processors -- but I'm super out of my element here -- I'm not familiar with sprockets interfaces at all, and don't even know where to begin.

[pongsanti]

@beechnut I noticed distant autoprefixer-rails version from the log

/Users/matt/.rvm/gems/ruby-2.3.1@basin/gems/autoprefixer-rails-2.2.0.20140804/lib/autoprefixer-rails/sprockets.rb:45:in register': undefined method register_postprocessor' for nil:NilClass (NoMethodError)

I guess you should update gem and try again. autoprefixer-rails gem The most current is 6.5.3

[dijonkitchen]

I still have a problem even with the latest versions. I also removed the versioning constraints and added therubyracer gem (didn't specify sprockets ~>2 though). See my PRs: #33 and #34

[onerinas]

@dijonkitchen Were you able to get rid of the warning?. I am getting this while starting the rails server.

[dijonkitchen]

@onerinas I think we moved on from this and just used Semantic UI from the client-side as it's own package inline. It looks like only one of my PRs were merged, but that fix may help you.