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87 lines
2.2 KiB
87 lines
2.2 KiB
4 years ago
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////
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Included in:
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- user-manual: Extensions: Tree Processor Example
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////
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Purpose::
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Detect literal blocks that contain shell commands, strip the prompt character and style the command using CSS in such a way that the prompt character cannot be selected (as seen on help.github.com).
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.sample-with-shell-session.adoc
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```
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$ echo "Hello, World!"
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> Hello, World!
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$ gem install asciidoctor
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```
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.ShellSessionTreeProcessor
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```ruby
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class ShellSessionTreeProcessor < Asciidoctor::Extensions::TreeProcessor
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def process document
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return unless document.blocks?
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process_blocks document
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nil
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end
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def process_blocks node
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node.blocks.each_with_index do |block, i|
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if block.context == :literal &&
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(((first_line = block.lines.first).start_with? '$ ') ||
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(first_line.start_with? '> '))
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node.blocks[i] = convert_to_terminal_listing block
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else
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process_blocks block if block.blocks?
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end
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end
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end
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def convert_to_terminal_listing block
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attrs = block.attributes
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attrs['role'] = 'terminal'
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prompt_attr = (attrs.has_key? 'prompt') ?
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%( data-prompt="#{block.sub_specialchars attrs['prompt']}") : nil
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lines = block.lines.map do |line|
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line = block.sub_specialchars line.chomp
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if line.start_with? '$ '
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%(<span class="command"#{prompt_attr}>#{line[2..-1]}</span>)
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elsif line.start_with? '> '
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%(<span class="output">#{line[5..-1]}</span>)
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else
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line
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end
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end
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create_listing_block block.document, lines * EOL, attrs, subs: nil
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end
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end
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```
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.Usage
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```ruby
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Asciidoctor::Extensions.register do
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treeprocessor ShellSessionTreeProcessor
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end
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Asciidoctor.convert_file 'sample-with-shell-session.adoc', :safe => :safe
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```
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////
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In the example below the TreeProcessor examines the block contents looking for the `// (*)` suffix and rewrites the line so that Asciidoctor formats it appropriately.
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[source,java]
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----
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protected void configure(HttpSecurity http) throws Exception {
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http
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.authorizeRequests()
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.antMatchers("/resources/**").permitAll() // (*)
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.anyRequest().authenticated()
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.and()
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.formLogin()
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.loginPage("/login")
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.permitAll();
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----
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////
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