Add the basic scaffolding for building the site with GNU/Make and Docker rather than Gradle

This will speed things up quite a bit and ensure that everybody's local
development environment/patterns are consistent.

.gitignore

@@ -37,3 +37,4 @@ content/doc/developer/extensions/*.adoc
 /Gemfile.lock
 /content/_site/
 /content/_tmp/
+vendor/

Gemfile

@@ -1,25 +1,23 @@
 source 'https://rubygems.org'
 
-# This file exists as a manually updated mirror of what is hosted in
-# build.gradle.
-#
-# It is only intended to make "power users" and frequent
-# contributors to the jenkins.io repository more effective by allowing them to
-# circumvent some of the JRuby/Gradle performance bottlenecks
-#
-# See this section for more:
-#   <https://github.com/jenkins-infra/jenkins.io/blob/master/CONTRIBUTING.adoc#advanced-building>
-
 gem 'colorize'
 gem 'awestruct', '~> 0.5.7'
 gem 'awestruct-ibeams', '~> 0.4'
-gem 'asciidoctor-jenkins-extensions', '~> 0.2.0'
+gem 'asciidoctor-jenkins-extensions'
 gem 'asciidoctor', '~> 1.5.5'
 
-gem 'faraday', '~> 0.9.2'
-
 # Support for various template engines we use
-gem 'haml', '~> 4.0'
+gem 'haml', '~> 4.0.7'
 gem 'liquid', '~> 3.0'
 gem 'kramdown', '~> 1.9.0'
 
+# Gems necessary for running scripts/fetch-external-resources
+group :fetcher do
+  gem 'faraday', '~> 0.9.2'
+  gem 'faraday_middleware', '~> 0.9.2'
+  gem 'rubyzip', '~> 1.2.0'
+end
+
+group :pdfs do
+  gem 'asciidoctor-pdf', '1.5.0.alpha.15'
+end

Makefile

@@ -0,0 +1,42 @@
+OUTPUT_DIR=build/_site
+AWESTRUCT_CONFIG=--source-dir=content --output-dir=$(OUTPUT_DIR)
+
+all: fetch generate pdfs
+
+run: warning depends
+	LISTEN=true ./scripts/ruby bundle exec awestruct --bind 0.0.0.0 --dev $(AWESTRUCT_CONFIG)
+
+depends:
+	./scripts/ruby bundle install --path=vendor/gems
+
+generate: warning depends $(OUTPUT_DIR)/releases.rss
+	./scripts/ruby bundle exec awestruct --generate --verbose $(AWESTRUCT_CONFIG)
+
+$(OUTPUT_DIR)/releases.rss: scripts/release.rss.groovy
+	./scripts/groovy scripts/release.rss.groovy 'https://updates.jenkins.io/release-history.json' > $(OUTPUT_DIR)/releases.rss
+
+pdfs: $(OUTPUT_DIR)/user-handbook.pdf
+
+$(OUTPUT_DIR)/user-handbook.pdf: depends scripts/generate-handbook-pdf
+	./scripts/ruby scripts/generate-handbook-pdf user-handbook.adoc
+	./scripts/ruby bundle exec asciidoctor-pdf -a allow-uri-read \
+		--base-dir content \
+		--out-file $(OUTPUT_DIR)/user-handbook.pdf \
+		user-handbook.adoc
+
+fetch: depends scripts/fetch-examples scripts/fetch-external-resources
+	./scripts/fetch-examples
+	./scripts/ruby bundle exec ./scripts/fetch-external-resources
+
+warning:
+	@echo '-------------------------------------------------------------'
+	@echo ">> To save time, this won't automatically run \`make fetch\`."
+	@echo ">> Please ensure you have run \`make fetch\` at least onces"
+	@echo '-------------------------------------------------------------'
+
+clean:
+	rm -rf vendor/gems
+	rm -rf build/
+
+
+.PHONY: all clean generate run fetch warning pdfs

content/_config/site.yml

@@ -1,8 +1,6 @@
 base_url: https://jenkins.io/
 local_tz: UTC
 base_title: Jenkins
-generation:
-  in_threads: 0
 google_analytics:
   anonymizeIp: true
   account: UA-4216293-5