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189 lines
4.5 KiB
Text
189 lines
4.5 KiB
Text
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#!/usr/bin/env ruby
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require "commonmarker"
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require "rouge"
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ROUGE_THEME = Rouge::Themes::Pastie
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COMMONMARKER_PARSE_OPTIONS = [:DEFAULT, :FOOTNOTES]
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COMMONMARKER_RENDER_OPTIONS = [:UNSAFE]
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COMMONMARKER_EXTENSIONS = [:tagfilter, :autolink, :table, :strikethrough, :tasklist]
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# parse arguments {{{
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def get_program_name()
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return File.basename($PROGRAM_NAME)
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end
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def print_help()
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$stderr.print <<EOF
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usage: #{get_program_name()} [<input_file>] [<output_file>]
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if <input_file> is not specified, input will be read from stdin
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if <output_file> is not specified, output will be printed to stdout
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EOF
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exit(true)
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end
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def print_error(*args)
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$stderr.puts("#{get_program_name()}: error:", *args)
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exit(false)
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end
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input_file_path = nil
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output_file_path = nil
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reading_only_positional_args = false
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positional_arg_index = 0
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ARGV.each do |arg|
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is_positional = reading_only_positional_args
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if not is_positional
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case arg
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when "-h", "--help"
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print_help()
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when "--"
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reading_only_positional_args = true
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else
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if arg.start_with?("-")
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print_error("unknown option: #{arg}")
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else
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is_positional = true
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end
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end
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end
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if is_positional
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case positional_arg_index
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when 0 then input_file_path = arg
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when 1 then output_file_path = arg
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else print_error("unexpected argument: #{arg}")
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end
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positional_arg_index += 1
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end
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end
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# }}}
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# parse markdown document {{{
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if input_file_path.nil?()
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markdown = $stdin.read()
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else
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markdown = IO.read(input_file_path)
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end
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doc = CommonMarker.render_doc(markdown, COMMONMARKER_PARSE_OPTIONS, COMMONMARKER_EXTENSIONS)
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# }}}
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# add header anchors {{{
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header_slug_occurences = {}
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doc.walk do |node|
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if node.type == :header
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header_slug = ""
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node.walk do |child_node|
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if [:text, :html, :html_inline, :code, :code_block, :footnote_reference].include?(child_node.type)
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header_slug += child_node.string_content
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end
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end
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header_slug.downcase!()
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header_slug.strip!()
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# remove special characters
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header_slug.delete!("\u2000-\u206F\u2E00-\u2E7F\\\\'!\"#$%&()*+,./:;<=>?@[]\\^`{|}~’")
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# remove emoji
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header_slug.delete!("\u{1F600}-\u{1F6FF}")
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# remove whitespace
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header_slug.gsub!(/\s/, "-")
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# make this slug unique
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while header_slug_occurences.key?(header_slug)
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occurences = header_slug_occurences[header_slug]
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occurences += 1
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header_slug_occurences[header_slug] = occurences
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header_slug += "-" + occurences.to_s()
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end
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header_slug_occurences[header_slug] = 0
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anchor_node = CommonMarker::Node.new(:inline_html)
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anchor_node.string_content = "<a class=\"anchor\" name=\"#{header_slug}\" href=\"\##{header_slug}\"><span class=\"octicon octicon-link\"></span></a>"
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node.prepend_child(anchor_node)
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end
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end
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# }}}
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# highlight code blocks {{{
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rouge_formatter = Rouge::Formatters::HTML.new()
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doc.walk do |node|
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if node.type == :code_block
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language = node.fence_info
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if not language.empty?()
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source = node.string_content
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lexer = Rouge::Lexer.find_fancy(language) || Rouge::Lexers::PlainText.new()
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highlighted_code = rouge_formatter.format(lexer.lex(source))
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new_node = CommonMarker::Node.new(:html)
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new_node.string_content = "<pre><code class=\"highlight highlight-source-#{new_node.html_escape_html(language)}\">#{highlighted_code}</code></pre>"
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node.insert_after(new_node)
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node.delete
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end
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end
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end
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# }}}
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# render HTML {{{
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rendered_html = <<EOF
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta http-equiv="X-UA-Compatible" content="ie=edge">
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<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/github-markdown-css/3.0.1/github-markdown.min.css" integrity="sha256-HbgiGHMLxHZ3kkAiixyvnaaZFNjNWLYKD/QG6PWaQPc=" crossorigin="anonymous" />
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<style>
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html, body {
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padding: 0;
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margin: 0;
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}
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.markdown-body {
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max-width: 882px;
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margin: 0 auto;
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padding: 32px;
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}
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.octicon-link {
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font: normal normal 16px 'octicons-link';
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line-height: 1;
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-webkit-font-smoothing: antialiased;
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-moz-osx-font-smoothing: grayscale;
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-webkit-user-select: none;
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-moz-user-select: none;
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-ms-user-select: none;
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user-select: none;
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}
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.octicon-link::before {
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content: '\\f05c';
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}
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#{ROUGE_THEME.render()}
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</style>
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</head>
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<body>
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<article class="markdown-body">
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#{doc.to_html(COMMONMARKER_RENDER_OPTIONS)}
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</article>
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</body>
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</html>
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EOF
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if output_file_path.nil?()
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$stdout.write(rendered_html)
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else
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IO.write(output_file_path, rendered_html)
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end
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# }}}
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