rosa-build/app/helpers/diff_helper.rb

# -*- encoding : utf-8 -*-
module DiffHelper
  #include Git::Diff::InlineCallback
  def render_diff(diff)
    diff_display ||= Diff::Display::Unified.new(diff.diff)
    prepare(diff)

    res = "<table class='diff inline' cellspacing='0' cellpadding='0'>"
    res += "<tbody>"
    res += renderer diff_display.data #diff_display.render(Git::Diff::InlineCallback.new comments)
    res += "</tbody>"
    res += "</table>"
    res.html_safe
  end

  ########################################################
  # FIXME: Just to dev, remove to lib
  ########################################################
  def prepare(diff)
    @num_line, @path = -1, diff.a_path
    @line_comments = @comments.select{|c| c.data.try('[]', :path) == @path}
  end

  def headerline(line)
    set_line_number
    "<tr class='header'>
      <td class='line_numbers'>...</td>
      <td class='line_numbers'>...</td>
      <td class='header'>#{line}</td>
    </tr>"
  end

  def addline(line)
    set_line_number
    "<tr class='changes'>
      <td class='line_numbers'></td>
      <td class='line_numbers'>#{line.new_number}</td>
      <td class='code ins'>
        #{line_comment}
        <pre>#{render_line(line)}</pre>
      </td>
     </tr>
     #{render_line_comments}"
  end

  def remline(line)
    set_line_number
    "<tr class='changes'>
      <td class='line_numbers'>#{line.old_number}</td>
      <td class='line_numbers'></td>
      <td class='code del'>
        #{line_comment}
        <pre>#{render_line(line)}</pre>
      </td>
    </tr>
    #{render_line_comments}"
  end

  def modline(line)
    set_line_number
    "<tr clas='chanes line'>
      <td class='line_numbers'>#{line.old_number}</td>
      <td class='line_numbers'>#{line.new_number}</td>
      <td class='code unchanged modline'>
        #{line_comment}
        <pre>#{render_line(line)}</pre>
      </td>
    </tr>
    #{render_line_comments}"
  end

  def unmodline(line)
    set_line_number
    "<tr class='changes unmodline'>
      <td class='line_numbers'>#{line.old_number}</td>
      <td class='line_numbers'>#{line.new_number}</td>
      <td class='code unchanged unmodline'>
        #{line_comment}
        <pre>#{render_line(line)}</pre>
      </td>
    </tr>
    #{render_line_comments}"
  end

  def sepline(line)
    "<tr class='changes hunk-sep'>
      <td class='line_numbers line_num_cut'>&hellip;</td>
      <td class='line_numbers line_num_cut'>&hellip;</td>
      <td class='code cut-line'></td>
    </tr>"
  end

  def nonewlineline(line)
    set_line_number
    "<tr class='changes'>
      <td class='line_numbers'>#{line.old_number}</td>
      <td class='line_numbers'>#{line.new_number}</td>
      <td class='code modline unmodline'>
        #{line_comment}
        <pre>#{render_line(line)}</pre>
      </td>
    </tr>
    #{render_line_comments}"
  end

  def before_headerblock(block)
  end

  def after_headerblock(block)
  end

  def before_unmodblock(block)
  end

  def before_modblock(block)
  end

  def before_remblock(block)
  end

  def before_addblock(block)
  end

  def before_sepblock(block)
  end

  def before_nonewlineblock(block)
  end

  def after_unmodblock(block)
  end

  def after_modblock(block)
  end

  def after_remblock(block)
  end

  def after_addblock(block)
  end

  def after_sepblock(block)
  end

  def after_nonewlineblock(block)
  end

  def new_line
    ""
  end

  def renderer(data)
    result = []
    data.each do |block|
      result << send("before_" + classify(block), block)
      result << block.map { |line| send(classify(line), line) }
      result << send("after_" + classify(block), block)
    end
    result.compact.join(new_line)
  end

  protected

  def classify(object)
    object.class.name[/\w+$/].downcase
  end

  def escape(str)
    str.to_s.gsub('&', '&amp;').gsub('<', '&lt;').gsub('>', '&gt;').gsub('"', '&#34;')
  end

  def render_line(line)
    res = '<span class="diff-content">'
    if line.inline_changes?
      prefix, changed, postfix = line.segments.map{|segment| escape(segment) }
      res += "#{prefix}<span class='idiff'>#{changed}</span>#{postfix}"
    else
      res += escape(line)
    end
    res += '</span>'

    res
  end

  def set_line_number
    @num_line = @num_line.succ
  end

  def line_comment
    #"<a href='#' class='add_line-comment'><img src='/assets/line_comment.png' alt='Add Comment'></a>"
    link_to image_tag('line_comment.png', :alt => t('layout.comments.new_header')), new_line_commit_comment_path(@project, @commit, :path => @path, :line => @num_line), :class => 'add_line-comment'
  end

  def render_line_comments
    comments = @line_comments.select{|c| c.data.try('[]', :line) == @num_line.to_s}
    "<tr>
      <td class='line_numbers line_comments' colspan='2'>#{comments.count}</td>
      <td>#{render("projects/comments/line_list", :list => comments, :project => @project, :commentable => @commit)}</td>
     </tr>" if comments.count > 0
  end
end