59 lines
1.6 KiB
Ruby
59 lines
1.6 KiB
Ruby
# Made by me :)
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# Feel free to use if you give credit
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require "base64"
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module Jekyll
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module Tags
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class CDTag < Liquid::Block
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def initialize(tag_name, markup, tokens)
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super
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arr = markup.split("s:")
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if arr[1] != nil
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@scale = arr[1].to_i
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else
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@scale = 60
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end
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@caption = arr[0].strip
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end
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def render(context)
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site = context.registers[:site]
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converter = site.find_converter_instance(::Jekyll::Converters::Markdown)
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caption = converter.convert(@caption).gsub(/<\/?p[^>]*>/, '').chomp
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code = super(context)
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latex = <<EOF
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\\documentclass[tikz]{standalone}
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\\usepackage{tikz-cd}
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\\begin{document}
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\\begin{tikzcd}#{code}\\end{tikzcd}
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\\end{document}
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EOF
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Dir.mktmpdir do |dir|
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File.write("#{dir}/cd.tex", latex)
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raise "pdflatex" unless system("pdflatex -output-directory #{dir} #{dir}/cd.tex")
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raise "inkscape" unless system("inkscape -l --export-filename=#{dir}/cd.svg #{dir}/cd.pdf")
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raise "scour" unless system("scour -i #{dir}/cd.svg -o #{dir}/optimized_cd.svg --enable-viewboxing --enable-id-stripping --enable-comment-stripping --shorten-ids --indent=none")
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svg = File.read("#{dir}/optimized_cd.svg")
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return <<EOF
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<figure class="cdfig">
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<img class="cd" style="width: #{@scale}%;" src="data:image/svg+xml;base64#{Base64.encode64(svg)}" alt="A commutative diagram"/>
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<figcaption>#{@caption}</figcaption>
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</figure>
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EOF
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end
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"<details><summary>#{caption}</summary>#{body}</details>"
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end
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end
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end
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end
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Liquid::Template.register_tag('cd', Jekyll::Tags::CDTag)
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