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How to use rake to insert/replace html section in each file?

Answer 1

+1 A:

You can manipulate the document directly and save the resulting output. If you confine your manipulations to a particular element, you won't alter the overall structure and should be fine.

A library like Nokogiri or Hpricot will only adjust your document if it's malformed. I know that Hpricot can be coached to have a more relaxed parsing method, or can operate in a more strict XML/XHTML manner.

Simple example:

require 'rubygems'
require 'hpricot'

document = <<END
<html>
<body>
<ul id="tag">
</ul>
<h1 class="indexed">Item 1</h1>
<h2 class="indexed">Item 1.1</h2>
<h1 class="indexed">Item 2</h1>
<h2 class="indexed">Item 2.1</h2>
<h2 class="indexed">Item 2.2</h2>
<h1>Remarks</h1>
<!-- Test Comment -->
</body>
</html>
END

parsed = Hpricot(document)

ul_tag = (parsed / 'ul#tag').first

sections = (parsed / '.indexed')

ul_tag.inner_html = sections.collect { |i| "<li>#{i.inner_html}</li>" }.to_s

puts parsed.to_html

This will yield:

<html>
<body>
<ul id="tag"><li>Item 1</li><li>Item 1.1</li><li>Item 2</li><li>Item 2.1</li><li>Item 2.2</li></ul>
<h1 class="indexed">Item 1</h1>
<h2 class="indexed">Item 1.1</h2>
<h1 class="indexed">Item 2</h1>
<h2 class="indexed">Item 2.1</h2>
<h2 class="indexed">Item 2.2</h2>
<h1>Remarks</h1>
<!-- Test Comment -->
</body>
</html>

tadman 2009-09-09 20:59:23

Answer 2

+2 A:

Could you rework the files to .rhtml, where

<ul id="toc">

is replaced with an erb directive, such as

<%= get_toc() %>

where get_toc() is defined in some library module. Write the transformed files as .html (to another directory if you like) and you're in business and the process is repeatable.

Or, come to that, why not just use gsub? Something like:

File.open(out_filename,'w+') do |output_file|
    output_file.puts File.read(filename).gsub(/\<ul id="toc"\>/, get_toc())
end

Mike Woodhouse 2009-09-09 23:02:38

Answer 3

+1 A:

I ended up with an idea similar to what Mike Woodhouse suggested. Only not using erb templates (as I wanted the source files to be freely editable also by non ruby-lovers)

  def update_toc(filename)
    raise "FATAL: Requires self.toc= ... before replacing TOC in files!" if @toc.nil?
    content = File.read(filename)
    content.gsub(/<h2 class="toc">.+?<\/ul>/, @toc)
  end

  def replace_toc_in_all_files
    @file_names.each do |name|
      content = update_toc(name)
      File.open(name, "w") do |io|
        io.write content
      end
    end
  end

Jesper Rønn-Jensen 2009-09-11 09:53:15

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How to use rake to insert/replace html section in each file?

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