A little script for replacing classed spans with html tags for converting GoogleDocs documents to MOBI format.

kfix.rb

require 'nokogiri'

@doc = Nokogiri::HTML File.open($*[0])

if $*[1] != nil
  iclass = $*[1]
  ital = @doc.css "span.#{iclass}"
  ital.each do |n|
    n['class'] = n['class'].gsub(/#{iclass}/, "").strip
    i = Nokogiri::XML::Node.new "i", @doc
    n.children.each { |c| c.parent = i }
    n.add_child i
  end
end

if $*[2] != nil
bclass = $*[2]
  bold = @doc.css "span.#{bclass}"
  bold.each do |n|
    n['class'] = n['class'].gsub(/#{bclass}/, "").strip
    b = Nokogiri::XML::Node.new "b", @doc
    n.children.each { |c| c.parent = b }
    n.add_child b
  end
end

if $*[3] != nil
  biclass = $*[3]
  bi = @doc.css "span.#{biclass}"
  bi.each do |n|
    n['class'] = n['class'].gsub(/#{biclass}/, "").strip
    b = Nokogiri::XML::Node.new "b", @doc
    i = Nokogiri::XML::Node.new "i", @doc
    n.children.each { |c| c.parent = b }
    i.add_child b
    n.add_child i
  end
end

if $*[4] != nil
  uclass = $*[4]
  under = @doc.css "span.#{uclass}"
  under.each do |n|
    n['class'] = n['class'].gsub(/#{uclass}/, "").strip
    u = Nokogiri::XML::Node.new "u", @doc
    n.children.each { |c| c.parent = u}
    n.add_child u
  end
end

if $*[5] != nil
  iuclass = $*[5]
  iu = @doc.css "span.#{iuclass}"
  iu.each do |n|
    n['class'] = n['class'].gsub(/#{iuclass}/, "").strip
    i = Nokogiri::XML::Node.new "i", @doc
    u = Nokogiri::XML::Node.new "u", @doc
    n.children.each { |c| c.parent = u }
    i.add_child u
    n.add_child i
  end
end

if $*[6] != nil
  buclass = $*[6]
  bu = @doc.css "span.#{buclass}"
  bu.each do |n|
    n['class'] = n['class'].gsub(/#{buclass}/, "").strip
    b = Nokogiri::XML::Node.new "b", @doc
    u = Nokogiri::XML::Node.new "u", @doc
    n.children.each { |c| c.parent = u }
    b.add_child u
    n.add_child b
  end
end

File.open($*[0], 'w') do |f|
  f.puts @doc.to_xhtml
end