Refactor docs into separate module

docs/src/main/asciidoc/README.adoc

@@ -0,0 +1,11 @@
+= Spring Cloud Bus
+
+include::intro.adoc[]
+
+== Quick Start
+
+include::quickstart.adoc[]
+
+== Building
+
+include::https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/master/src/main/asciidoc/building.adoc[]

docs/src/main/asciidoc/ghpages.sh

@@ -0,0 +1,46 @@
+#!/bin/bash -x
+
+git remote set-url --push origin `git config remote.origin.url | sed -e 's/^git:/https:/'`
+
+if ! (git remote set-branches --add origin gh-pages && git fetch -q); then
+    echo "No gh-pages, so not syncing"
+    exit 0
+fi
+
+if ! [ -d target/generated-docs ]; then
+    echo "No gh-pages sources in target/generated-docs, so not syncing"
+    exit 0
+fi
+
+# Stash any outstanding changes
+###################################################################
+git diff-index --quiet HEAD
+dirty=$?
+if [ "$dirty" != "0" ]; then git stash; fi
+
+# Switch to gh-pages branch to sync it with master
+###################################################################
+git checkout gh-pages
+
+for f in target/generated-docs/*; do
+    file=${f#target/generated-docs/*}
+    if ! git ls-files -i -o --exclude-standard --directory | grep -q ^$file$; then
+        # Not ignored...
+        cp -rf $f .
+        git add -A $file
+    fi
+done
+
+git commit -a -m "Sync docs from master to gh-pages"
+
+# Uncomment the following push if you want to auto push to
+# the gh-pages branch whenever you commit to master locally.
+# This is a little extreme. Use with care!
+###################################################################
+git push origin gh-pages
+
+# Finally, switch back to the master branch and exit block
+git checkout master
+if [ "$dirty" != "0" ]; then git stash pop; fi
+
+exit 0

docs/src/main/asciidoc/intro.adoc

@@ -0,0 +1,2 @@
+Spring Cloud Bus links nodes of a distributed system with a lightweight message broker. This can then be used to broadcast state changes (e.g. configuration changes) or other management instructions. A key idea is that the Bus is like a distributed Actuator for a Spring Boot application that is scaled out, but it can also be used as a communication channel between apps. The only implementation currently is with an AMQP broker as the transport, but the same basic feature set (and some more depending on the transport) is on the roadmap for other transports.
+

docs/src/main/asciidoc/quickstart.adoc

@@ -0,0 +1,13 @@
+Spring Cloud Bus works by adding Spring Boot autconfiguration if it detects itself on the classpath. All you need to do to enable the bus is to add `spring-cloud-starter-bus-amqp` to your dependency management and Spring Cloud takes care of the rest. Make sure RabbitMQ is available and configured to provide a `ConnectionFactory`: running on localhost you shouldn't have to do anything, but if you are running remotely use Spring Cloud Connectors, or Spring Boot conventions to define the broker credentials, e.g.
+
+.application.yml
+----
+spring:
+  rabbitmq:
+    host: mybroker.com
+    port: 5672
+    username: user
+    password: secret
+----
+
+The bus currently supports sending messages to all nodes listening or all nodes for a particular service (as defined by Eureka).  More selector criteria will be added in the future (ie. only service X nodes in data center Y, etc...). The http endpoints are under the `/bus/*` actuator namespace.  There are currently two implemented.  The first, `/bus/env`, sends key/values pairs to update each nodes Spring Environment.  The second, `/bus/refresh`, will reload each application's configuration, just as if they had all been pinged on their `/refresh` endpoint.

docs/src/main/asciidoc/spring-cloud-bus.adoc

@@ -0,0 +1,8 @@
+= Spring Cloud Bus
+:toc:
+
+include::intro.adoc[]
+
+== Quick Start
+
+include::quickstart.adoc[]

docs/src/main/ruby/generate_readme.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env ruby
+
+base_dir = File.join(File.dirname(__FILE__),'../../..')
+src_dir = File.join(base_dir, "/src/main/asciidoc")
+require 'asciidoctor'
+require 'optparse'
+
+options = {}
+file = "#{src_dir}/README.adoc"
+
+OptionParser.new do |o|
+  o.on('-o OUTPUT_FILE', 'Output file (default is stdout)') { |file| options[:to_file] = file unless file=='-' }
+  o.on('-h', '--help') { puts o; exit }
+  o.parse!
+end
+
+file = ARGV[0] if ARGV.length>0
+
+srcDir = File.dirname(file)
+out = "// Do not edit this file (e.g. go instead to src/main/asciidoc)\n\n"
+doc = Asciidoctor.load_file file, safe: :safe, parse: false, attributes: 'allow-uri-read'
+out << doc.reader.read
+
+unless options[:to_file]
+  puts out
+else
+  File.open(options[:to_file],'w+') do |file|
+    file.write(out)
+  end
+end