44 lines
1.1 KiB
Ruby
44 lines
1.1 KiB
Ruby
require 'rouge/plugins/redcarpet'
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module Banzai
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module Filter
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# HTML Filter to highlight fenced code blocks
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#
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class SyntaxHighlightFilter < HTML::Pipeline::Filter
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include Rouge::Plugins::Redcarpet
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def call
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doc.search('pre > code').each do |node|
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highlight_node(node)
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end
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doc
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end
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def highlight_node(node)
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language = node.attr('class')
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code = node.text
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begin
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highlighted = block_code(code, language)
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rescue
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# Gracefully handle syntax highlighter bugs/errors to ensure
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# users can still access an issue/comment/etc.
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highlighted = "<pre>#{code}</pre>"
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end
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# Replace the parent `pre` element with the entire highlighted block
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node.parent.replace(highlighted)
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end
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private
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# Override Rouge::Plugins::Redcarpet#rouge_formatter
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def rouge_formatter(lexer)
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Rouge::Formatters::HTMLGitlab.new(
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cssclass: "code highlight js-syntax-highlight #{lexer.tag}")
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end
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end
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end
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end
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