Migrate the project from sprockets to webpacker

The asset pipeline was introduced in Rails 3.1. However, since Rails 5.1
webpacker has been available, so that it's possible to use webpack.

The project has been fully migrated to use webpacker for bundeling
javascripts as well as stylesheets now. This way, sprockets has been
completely replaced and removed from the project. Associated gems as
jquery-rails have been removed as well.
Accordingly all advanced webpack functionalities are available now.

The bin/first-run file as well as the Dockerfiles have been adjusted to
use webpacker instead of the asset pipeline.

Please note: In order to use webpacker, yarn has to be installed on
the target system. Please make sure that 'yarnpkg' is in your path.

Signed-off-by: Max Magorsch <max@magorsch.de>

4 files changed, 44 insertions, 3 deletions

diff --git a/bin/first-run b/bin/first-run
index 63130ed..564adf5 100755
--- a/bin/first-run
+++ b/bin/first-run
@@ -4,8 +4,10 @@
 sleep 30
 
 bundler install
+yarn install --check-files
 bundle exec rake tmp:create RAILS_ENV=${1:-development}
-bundle exec rake assets:precompile RAILS_ENV=${1:-development}
+bundle exec rake tmp:cache:clear RAILS_ENV=${1:-development}
+bundle exec rake webpacker:compile RAILS_ENV=${1:-development}
 bundle exec rake kkuleomi:index:init RAILS_ENV=${1:-development}
 ./bin/update-all.sh ${1:-development}
 
diff --git a/bin/test.sh b/bin/test.sh
index e9f1792..6b7c782 100755
--- a/bin/test.sh
+++ b/bin/test.sh
@@ -3,9 +3,10 @@
 # Wait for Elasticsearch to start up
 sleep 30
 
-#bundler install
+bundler install
+yarn install --check-files
 bundle exec rake tmp:create RAILS_ENV=test
-bundle exec rake assets:precompile RAILS_ENV=test
+bundle exec rake webpacker:compile RAILS_ENV=test
 bundle exec rake kkuleomi:index:init RAILS_ENV=test
 bundle exec rake kkuleomi:update:all RAILS_ENV=test
 
diff --git a/bin/webpack b/bin/webpack
new file mode 100755
index 0000000..008ecb2
--- /dev/null
+++ b/bin/webpack
@@ -0,0 +1,19 @@
+#!/usr/bin/env ruby
+
+ENV["RAILS_ENV"] ||= ENV["RACK_ENV"] || "development"
+ENV["NODE_ENV"]  ||= "development"
+
+require "pathname"
+ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../Gemfile",
+  Pathname.new(__FILE__).realpath)
+
+require "rubygems"
+require "bundler/setup"
+
+require "webpacker"
+require "webpacker/webpack_runner"
+
+APP_ROOT = File.expand_path("..", __dir__)
+Dir.chdir(APP_ROOT) do
+  Webpacker::WebpackRunner.run(ARGV)
+end
diff --git a/bin/webpack-dev-server b/bin/webpack-dev-server
new file mode 100755
index 0000000..a931a9b
--- /dev/null
+++ b/bin/webpack-dev-server
@@ -0,0 +1,19 @@
+#!/usr/bin/env ruby
+
+ENV["RAILS_ENV"] ||= ENV["RACK_ENV"] || "development"
+ENV["NODE_ENV"]  ||= "development"
+
+require "pathname"
+ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../Gemfile",
+  Pathname.new(__FILE__).realpath)
+
+require "rubygems"
+require "bundler/setup"
+
+require "webpacker"
+require "webpacker/dev_server_runner"
+
+APP_ROOT = File.expand_path("..", __dir__)
+Dir.chdir(APP_ROOT) do
+  Webpacker::DevServerRunner.run(ARGV)
+end