Some documentation generation fixes

- Add docgen command to use internal libraries
- Fix loading of base files due to plugin path changes
- Fix loading of jar dependency files
- Remove kramdown gem and actions
- Cleanup the generated synopsis a bit

Fixes #2009

docs/asciidocgen.rb

@@ -1,7 +1,6 @@
 require "rubygems"
 require "erb"
 require "optparse"
-require "kramdown" # markdown parser
 
 $: << Dir.pwd
 $: << File.join(File.dirname(__FILE__), "..", "lib")
@@ -84,7 +83,7 @@ class LogStashConfigAsciiDocGenerator
     # are gone from logstash.
     name = name.to_s unless name.is_a?(Regexp)
 
-    description = Kramdown::Document.new(@comments.join("\n")).to_kramdown
+    description = @comments.join("\n")
     @attributes[name][:description] = description
     clear_comments
   end # def add_config
@@ -156,24 +155,32 @@ class LogStashConfigAsciiDocGenerator
 
     # Loading the file will trigger the config dsl which should
     # collect all the config settings.
+
+    # include the plugin lib dir for loading specific files
+
+    $: << File.join(File.dirname(file), "..", "..")
+    # include the lib dir of the plugin it self for any local dependencies
     load file
 
+    # Get the correct base path
+    base = File.join(LogStash::Environment::LOGSTASH_HOME,'lib/logstash', file.split("/")[-2])
+
     # parse base first
-    parse(File.new(File.join(File.dirname(file), "base.rb"), "r").read)
+    parse(File.new(File.join(base, "base.rb"), "r").read)
 
     # Now parse the real library
     code = File.new(file).read
 
     # inputs either inherit from Base or Threadable.
     if code =~ /\< LogStash::Inputs::Threadable/
-      parse(File.new(File.join(File.dirname(file), "threadable.rb"), "r").read)
+      parse(File.new(File.join(base, "threadable.rb"), "r").read)
     end
 
     if code =~ /include LogStash::PluginMixins/
       mixin = code.gsub(/.*include LogStash::PluginMixins::(\w+)\s.*/m, '\1')
       mixin.gsub!(/(.)([A-Z])/, '\1_\2')
       mixin.downcase!
-      parse(File.new(File.join(File.dirname(file), "..", "plugin_mixins", "#{mixin}.rb")).read)
+      parse(File.new(File.join(base, "..", "plugin_mixins", "#{mixin}.rb")).read)
     end
 
     parse(code)
@@ -202,7 +209,7 @@ class LogStashConfigAsciiDocGenerator
     is_contrib_plugin = @contrib_list.include?(file)
 
     # descriptions are assumed to be markdown
-    description = Kramdown::Document.new(@class_description).to_kramdown
+    description = @class_description
 
     klass.get_config.each do |name, settings|
       @attributes[name].merge!(settings)

docs/plugin-synopsis.asciidoc.erb

@@ -9,7 +9,6 @@
 <%= "  " if section == "codec" %>    <%= name %> => ... 
 <% end -%>
 <%= "  " if section == "codec" %>}
-
 --------------------------
 
 [cols="<,<,<,<m",options="header",]

lib/logstash/runner.rb

@@ -120,6 +120,22 @@ class LogStash::Runner
         require "pry"
         return binding.pry
       end,
+      "docgen" => lambda do
+        require 'docs/asciidocgen'
+        opts = OptionParser.new
+        settings = {}
+        opts.on("-o DIR", "--output DIR",
+          "Directory to output to; optional. If not specified,"\
+          "we write to stdout.") do |val|
+          settings[:output] = val
+        end
+        args = opts.parse(ARGV)
+        docs = LogStashConfigAsciiDocGenerator.new
+        args.each do |arg|
+          docs.generate(arg, settings)
+        end
+        return 0
+      end,
       "plugin" => lambda do
         require 'logstash/pluginmanager'
         plugin_manager = LogStash::PluginManager::Main.new($0)

logstash.gemspec

@@ -120,7 +120,6 @@ Gem::Specification.new do |gem|
 
   # Development Deps
   gem.add_development_dependency "coveralls"
-  gem.add_development_dependency "kramdown"       #(MIT license) pure-ruby markdown parser
 
   # Jenkins Deps
   gem.add_runtime_dependency "ci_reporter", "1.9.3"