Background

• Home: http://eagle.incubator.apache.org/
• Jekyll: Apache Eagle's document site http://eagle.incubator.apache.org/) is built upon Jekyll (https://jekyllrb.com/) which is a widely-used static websites and blogs generator program. 
  
• Source code:  https://github.com/apache/incubator-eagle/tree/document/website
• Markdown: https://daringfireball.net/projects/markdown/
• Apache SVN Host: Unlike most typical Jekyll web sites, Eagle's website is not hosted on Github Page but Apache SVN server at http://svn.apache.org/viewvc/incubator/eagle/site/

How to Set up Environment

• Install Ruby with RVM (http://rvm.io/) 

  Why use RVM instead of native Ruby? http://code.tutsplus.com/articles/why-you-should-use-rvm--net-19529

  curl -sSL https://get.rvm.io | bash -s stable
  source ~/.profile
  rvm install ruby

  Tips: if you're facing permission issue, try to run commands with "sudo".

• Use Ruby and Gem (https://rubygems.org/) to install Jekyll 

  How to install Jeklly? https://jekyllrb.com/docs/installation/

  rvm list
  rvm use ruby
  gem install jekyll

  Tips: during installation, problem "Could not find a valid gem 'jekyll' (>= 0)..." encountered. To solve it, execute "gem sources --add https://ruby.taobao.org/ --remove https://rubygems.org/" before running "gem install jekyll".

• Clone Eagle Document Site

  git clone https://github.com/apache/incubator-eagle.git 
  cd incubator-eagle
  git checkout origin/document -b document

• Build and Preview Eagle Document Site (url is http://127.0.0.1:4000/ by default)

  $ cd website
  $ jekyll serve
  /Users/hao/.rvm/gems/ruby-2.2.0/gems/execjs-2.6.0/lib/execjs/external_runtime.rb:135: warning: Insecure world writable dir /usr/local in PATH, mode 040777
  Configuration file: /Users/hao/Workspace/incubator-eagle/website/_config.yml
              Source: /Users/hao/Workspace/incubator-eagle/website
         Destination: /Users/hao/Workspace/incubator-eagle/website/_site
        Generating...
                      done.
   Auto-regeneration: enabled for '/Users/hao/Workspace/incubator-eagle/website'
  Configuration file: /Users/hao/Workspace/incubator-eagle/website/_config.yml
      Server address: http://127.0.0.1:4000/
    Server running... press ctrl-c to stop.

How to Write Document

• Create a new markdown file like https://raw.githubusercontent.com/apache/incubator-eagle/document/website/introduction.md, where following header on the top: 

  Learn more about markdown syntax? https://daringfireball.net/projects/markdown/syntax

  ---
  layout: doc
  title:  ${document_title, for example "Tutorial"} 
  permalink: ${permalink, for example '/docs/index.html'"
  ---
   
  More Markdown Content Here

• Preview new created document by visit http://127.0.0.1:4000/${permalink}, for example, http://127.0.0.1:4000/docs/index.html

  With jerkell server running, any changes on the markdown files will trigger the jekyll service to rebuild the site automatically with logs like:

  Regenerating: 1 file(s) changed at 2016-04-07 13:03:44 ...done in 0.383916 seconds.

• Configure new created document into document sidebar in https://github.com/apache/incubator-eagle/blob/document/website/_config.yml#L15 like 

  - category: Getting Started
      links:
        - title: Introduction
          url: /docs/index.html

  Then the document like will show on the sidebar like http://eagle.incubator.apache.org/docs/ looks.

How to Publish

• Clone site from apache svn repository http://svn.apache.org/viewvc/incubator/eagle/site/ into local directory EAGLE_SITE_SVN_DIR for example "eagle-site-svn"

• Build as static web site into '_site' directory and commit changes under ${EAGLE_SITE_SVN_DIR} back to apache svn repository

  $ jekyll build
  Configuration file: /Users/hao/Workspace/incubator-eagle/website/_config.yml
              Source: /Users/hao/Workspace/incubator-eagle/website
         Destination: /Users/hao/Workspace/incubator-eagle/website/_site
        Generating... done.

• Commit "_site" content into svn repository 

  How to use SVN? http://svnbook.red-bean.com/ or use GUI tool http://www.smartsvn.com/

• Validate whether the website is updated in http://eagle.incubator.apache.org/docs/