Redmine

<% content_for :header_tags do -%>

    <%= stylesheet_link_tag "scm" -%>

<% end -%>

<% html_title "##{@issue.id}: #{@issue.subject} - change #{@detail.id}" %>

<%= l(:field_issue) %>: <%= link_to( "##{@issue.id} " + h(@issue.subject), 

  :controller => 'issues', :action => 'show', :id => @issue) %>

<p>

  <div><%= l(:label_diff) %>: </div>

  <%= render :partial => 'common/diff', :locals => {:diff => @diff, 

    :diff_type => 'inline'} %>

</p>

<p>

  <div><a href="javascript:void()" onclick="$('old_value').toggle();">

    <%= l(:label_show_old_value) %>

  </a></div>

  <div id="old_value" style="display:none;">

    <%= textilizable @detail, :old_value %>  

  </div>

</p>

<p>

  <div><a href="javascript:void()" onclick="$('new_value').toggle();">

    <%= l(:label_show_new_value) %>

  </a></div>

  <div id="new_value" style="display:none;">

    <%= textilizable @detail, :value %>  

  </div>

</p>

  before_filter :authorize, :except => [:index, :changes, :preview, 

    :update_form, :context_menu, :diff]

  #warning - relies on availability of 'diff' utility

  def diff

    @detail = JournalDetail.find(params[:id])

    @issue = @detail.journal.issue

    Tempfile.open 'issue_description_oldval', 'tmp' do |old_val_file|      

      old_val_file.write normalize(@detail.old_value)

      Tempfile.open 'issue_description_oldval', 'tmp' do |new_val_file|

        new_val_file.write normalize(@detail.value)

        old_val_file.close

        new_val_file.close

        #at this moment old_val_file and new_val_file files still exist - they 

        #  will disappear after these objects finalization

        @diff = `diff #{old_val_file.path} #{new_val_file.path} -U 3`

      end

    end

  end

  private

  #Converts \n-terminated string to \r\n-teminated. At least FF on Windows 

  #  inserts \r\n everywhere, even if original text was \n-terminated (that's 

  #  how it is after Trac migration)

  def normalize(long_string)

    #we assume that if one line is \r\n\'ed, all others are too

    return long_string if long_string["\r\n"] 

    long_string.split("\n").join("\r\n")

  end

      when 'description'

        return content_tag('strong', l(:field_description)) + ' ' + 

          link_to(l(:text_journal_just_changed), 

          :controller => 'issues', :action => 'diff', :id => detail.id)

      (Issue.column_names - ['id']).each {|c|

class AllowLongJournalDetailsValues < ActiveRecord::Migration

  def self.up

    change_column :journal_details, :old_value, :text

    change_column :journal_details, :value, :text

  end

  def self.down

    #no need

  end

end

label_diff: Difference

label_show_old_value: Show old value

label_show_new_value: Show new value

text_journal_just_changed: changed

label_diff: Различия

label_show_old_value: Показать старое значение

label_show_new_value: Показать новое значение

text_journal_just_changed: параметр изменился

description_change: 

  old_value: "one two three"

  property: attr

  id: 3

  value: "one one two three"

  prop_key: description

  journal_id: 1

  def test_diff

    @request.session[:user_id] = 2

    get :diff, :id => journal_details(:description_change).id

    assert_response :success

  end