Create a new admonition for version

- VERSION to indicate version info inside sections. When further
  descriptions are needed, authors can use this admonition.
- Create style directory and put config files in it.
- Adjust Makefile

Makefile

@@ -15,10 +15,11 @@ beam-book.pdf: xml/beam-book-from-ab.xml
 
 ### Experimental pdf command
 beam-book2.pdf:  chapters/opcodes_doc.asciidoc book.asciidoc  chapters/*.asciidoc chapters/contributors.txt
-	asciidoctor-pdf  -r ./custom-pdf-converter.rb -r asciidoctor-diagram -a config=ditaa.cfg --doctype book -a media=prepress -a pdf-style=pdf-theme.yml book.asciidoc -o $@
+	cp -r images/*.png site/images
+	asciidoctor-pdf  -r ./style/custom-pdf-converter.rb -r asciidoctor-diagram -r ./style/custom-admonition-block.rb  -a config=./style/ditaa.cfg --doctype book -a media=prepress -a pdf-style=./style/pdf-theme.yml book.asciidoc -o $@
 
 index.html:
-	asciidoctor -r asciidoctor-diagram  -a config=ditaa.cfg --backend=html5 --doctype=book -o site/index.html book.asciidoc
+	asciidoctor -r asciidoctor-diagram  -r ./style/custom-admonition-block.rb -a config=style/ditaa.cfg --backend=html5 --doctype=book -o site/index.html book.asciidoc --trace
 	cp -r images/*.png site/images
 
 code/book/ebin/generate_op_doc.beam: code/book/src/generate_op_doc.erl
@@ -33,3 +34,4 @@ genop.tab:
 
 clean:
 	rm -f beam-book.pdf site/index.html site/*.png site/*.md5 xml/*.png xml/*.md5 xml/beam-book-from-ab.xml
+	rm -f beam-book2.pdf site/images/*.png

book.asciidoc

@@ -11,7 +11,7 @@
 :sectlinks:
 :!compat-mode:
 :source-highlighter: rouge
-:imagesdir: images
+:imagesdir: site/images
 :ditaa-shadows: false
 :ditaa-transparent: true
 

chapters/scheduling.asciidoc

@@ -140,7 +140,7 @@ there is no way to loop forever without doing a function call.
 Each function call is counted as a `reduction`; when the reduction
 limit for the process is reached it is suspended.
 
-[NOTE]
+[VERSION]
 .Version Info
 ====
 Prior to OTP-20.0, the value of `CONTEXT_REDS` was 2000.

style/custom-admonition-block.rb

@@ -0,0 +1,30 @@
+require 'asciidoctor/extensions'
+
+class VersionBlock < Asciidoctor::Extensions::BlockProcessor
+  use_dsl
+  named :VERSION
+  on_context :example
+
+  def process parent, reader, attrs
+    attrs['name'] = 'version'
+    attrs['caption'] = 'version'
+    admon = create_block parent, :admonition, nil, attrs, content_model: :compound
+    parse_content admon, reader
+    admon
+  end
+end
+
+class VersionBlockCss < Asciidoctor::Extensions::DocinfoProcessor
+  use_dsl
+
+  def process doc
+    '<style>
+.admonitionblock td.icon .icon-version:before{content:"\f02c";color:#900C3F}
+</style>'
+  end
+end
+
+Asciidoctor::Extensions.register do
+  block VersionBlock
+  docinfo_processor VersionBlockCss
+end

pdf-theme.yml → style/pdf-theme.yml

@@ -164,11 +164,11 @@ admonition:
   column_rule_color: $base_border_color
   column_rule_width: $base_border_width
   padding: [0, $horizontal_rhythm, 0, $horizontal_rhythm]
-  #icon:
-  #  tip:
-  #    name: far-lightbulb
-  #    stroke_color: 111111
-  #    size: 24
+  icon:
+    version:
+      name: fa-tags
+      stroke_color: A26D6D
+      size: 24
   label:
     text_transform: uppercase
     font_style: bold