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82 lines
2.1 KiB
Ruby
82 lines
2.1 KiB
Ruby
#!/usr/bin/env ruby
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# A little Markdown filter that scans your document for headings,
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# numbers them, adds anchors, and inserts a table of contents.
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#
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# To use it, make sure the headings you want numbered and linked are
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# in this format:
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#
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# ### Title ###
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#
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# I.e. they must have an equal number of octothorpes around the title
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# text. (In Markdown, `#` means `h1`, `##` means `h2`, and so on.)
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# The table of contents will be inserted before the first such
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# heading.
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#
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# Released into the public domain.
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# Sam Stephenson <sstephenson@gmail.com>
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# 2011-04-30
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def mdtoc(markdown)
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titles = []
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lines = markdown.split($/)
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start = nil
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# First pass: Scan the Markdown source looking for titles of the
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# format: `### Title ###`. Record the line number, header level
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# (number of octothorpes), and text of each matching title.
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lines.each_with_index do |line, line_no|
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if line.match(/^(\#{1,6})\s+(.+?)\s+\1$/)
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titles << [line_no, $1.length, $2]
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start ||= line_no
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end
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end
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last_section = nil
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last_level = nil
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# Second pass: Iterate over all matched titles and compute their
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# corresponding section numbers. Then replace the titles with
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# annotated anchors.
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titles.each do |title_info|
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line_no, level, text = title_info
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if last_section
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section = last_section.dup
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if last_level < level
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section << 1
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else
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(last_level - level).times { section.pop }
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section[-1] += 1
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end
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else
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section = [1]
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end
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name = section.join(".")
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lines[line_no] = %(#{"#" * level} <a name="section_#{name}"></a> #{name} #{text})
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title_info << section
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last_section = section
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last_level = level
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end
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# Third pass: Iterate over matched titles once more to produce the
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# table of contents. Then insert it immediately above the first
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# matched title.
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if start
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toc = titles.map do |(line_no, level, text, section)|
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name = section.join(".")
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%(#{" " * (section.length * 3)}* [#{name} #{text}](#section_#{name}))
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end + [""]
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lines.insert(start, *toc)
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end
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lines.join("\n")
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end
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if __FILE__ == $0
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puts mdtoc($<.read)
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end
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