Loading custom extension from CLI

Hi I am trying to run a very simple Ruby extension I have developed from CLI, but it don't work. Probably it is because of something related of Ruby and not Asciidoctor.

[source, ruby]
.extension.rb
----
require 'asciidoctor'
require 'asciidoctor/extensions'

class EmojifyBlockMacro < Asciidoctor::Extensions::BlockMacroProcessor
  def process parent, target, attributes

    size = (attributes.has_key? 'size') ? attributes['size'] : '24'

    source = %(
    <img height="#{size}" src="http://www.tortue.me/emoji/#{target}.png" width="#{size}" />
    )
    Asciidoctor::Block.new parent, :pass, :content_model => :raw, :source => source
  end
end

Asciidoctor::Extensions.register do |document|
  if document.basebackend? 'html'
    block_macro :emoji, EmojifyBlockMacro
  end
end
----

Then when I run from the same directory of extension.rb next line:

asciidoctor test.adoc -r ./extension.rb -o test.html

Next exception id thrown:

extension.rb:17:in `block in <top (required)>': undefined method `basebackend?' for #<Asciidoctor::Extensions::Registry:0x00000002777228> (NoMethodError)
        from /var/lib/gems/1.9.1/gems/asciidoctor-1.5.1/lib/asciidoctor/extensions.rb:507:in `call'
        from /var/lib/gems/1.9.1/gems/asciidoctor-1.5.1/lib/asciidoctor/extensions.rb:507:in `block in activate'
        from /var/lib/gems/1.9.1/gems/asciidoctor-1.5.1/lib/asciidoctor/extensions.rb:500:in `each'

But I have seen that this method currently exists in document class, so what it is missing?

Thanks.

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NAML

Alex,

This is happening because you are naming the block parameter document when it's really a registry. To access the document from the register block, you can either use the instance variable, @document:

[source,ruby]
----
Asciidoctor::Extensions.register do
  if @document.basebackend? 'html'
    block_macro :emoji, EmojifyBlockMacro
  end
end
----

We don't currently support document as an argument to the block, but we could if we check for an arity of 2. See https://github.com/asciidoctor/asciidoctor/blob/master/lib/asciidoctor/extensions.rb#L503. That would allow:

[source,ruby]
----
Asciidoctor::Extensions.register do |registry, document|
  if document.basebackend? 'html'
    block_macro :emoji, EmojifyBlockMacro
  end
end
----

Please note the second example is not currently supported.

Cheers,

-Dan

On Wed, Oct 29, 2014 at 3:33 AM, asotobu [via Asciidoctor :: Discussion] <[hidden email]> wrote:

Hi I am trying to run a very simple Ruby extension I have developed from CLI, but it don't work. Probably it is because of something related of Ruby and not Asciidoctor.

[source, ruby]
.extension.rb
----
require 'asciidoctor'
require 'asciidoctor/extensions'

class EmojifyBlockMacro < Asciidoctor::Extensions::BlockMacroProcessor
  def process parent, target, attributes

    size = (attributes.has_key? 'size') ? attributes['size'] : '24'

    source = %(
    <img height="#{size}" src="http://www.tortue.me/emoji/#{target}.png" width="#{size}" />
    )
    Asciidoctor::Block.new parent, :pass, :content_model => :raw, :source => source
  end
end

Asciidoctor::Extensions.register do |document|
  if document.basebackend? 'html'
    block_macro :emoji, EmojifyBlockMacro
  end
end
----

Then when I run from the same directory of extension.rb next line:

asciidoctor test.adoc -r ./extension.rb -o test.html

Next exception id thrown:

extension.rb:17:in `block in <top (required)>': undefined method `basebackend?' for #<Asciidoctor::Extensions::Registry:0x00000002777228> (NoMethodError)
        from /var/lib/gems/1.9.1/gems/asciidoctor-1.5.1/lib/asciidoctor/extensions.rb:507:in `call'
        from /var/lib/gems/1.9.1/gems/asciidoctor-1.5.1/lib/asciidoctor/extensions.rb:507:in `block in activate'
        from /var/lib/gems/1.9.1/gems/asciidoctor-1.5.1/lib/asciidoctor/extensions.rb:500:in `each'

But I have seen that this method currently exists in document class, so what it is missing?

Thanks.

---

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http://discuss.asciidoctor.org/Loading-custom-extension-from-CLI-tp2398.html

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NAML

--

Dan Allen | http://google.com/profiles/dan.j.allen

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NAML

The extension examples in the user manual came from the 0.1.4 release notes, so they likely all need reviewing. Sorry for misleading you.

-Dan

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NAML