SoundSoftware Code Site

# Redmine - project management software

# Copyright (C) 2006-2009  Jean-Philippe Lang

#

# This program is free software; you can redistribute it and/or

# modify it under the terms of the GNU General Public License

# as published by the Free Software Foundation; either version 2

# of the License, or (at your option) any later version.

# 

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

# 

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

require 'diff'

require 'enumerator'

class WikiPage < ActiveRecord::Base

  belongs_to :wiki

  has_one :content, :class_name => 'WikiContent', :foreign_key => 'page_id', :dependent => :destroy

  acts_as_attachable :delete_permission => :delete_wiki_pages_attachments

  acts_as_tree :dependent => :nullify, :order => 'title'

  acts_as_watchable

  acts_as_event :title => Proc.new {|o| "#{l(:label_wiki)}: #{o.title}"},

                :description => :text,

                :datetime => :created_on,

                :url => Proc.new {|o| {:controller => 'wiki', :action => 'show', :project_id => o.wiki.project, :id => o.title}}

  acts_as_searchable :columns => ['title', 'text'],

                     :include => [{:wiki => :project}, :content],

                     :project_key => "#{Wiki.table_name}.project_id"

  attr_accessor :redirect_existing_links

  validates_presence_of :title

  validates_format_of :title, :with => /^[^,\.\/\?\;\|\s]*$/

  validates_uniqueness_of :title, :scope => :wiki_id, :case_sensitive => false

  validates_associated :content

  # Wiki pages that are protected by default

  DEFAULT_PROTECTED_PAGES = %w(sidebar)

  def after_initialize

    if new_record? && DEFAULT_PROTECTED_PAGES.include?(title.to_s.downcase)

      self.protected = true

    end

  end

  def visible?(user=User.current)

    !user.nil? && user.allowed_to?(:view_wiki_pages, project)

  end

  def title=(value)

    value = Wiki.titleize(value)

    @previous_title = read_attribute(:title) if @previous_title.blank?

    write_attribute(:title, value)

  end

  def before_save

    self.title = Wiki.titleize(title)    

    # Manage redirects if the title has changed

    if !@previous_title.blank? && (@previous_title != title) && !new_record?

      # Update redirects that point to the old title

      wiki.redirects.find_all_by_redirects_to(@previous_title).each do |r|

        r.redirects_to = title

        r.title == r.redirects_to ? r.destroy : r.save

      end

      # Remove redirects for the new title

      wiki.redirects.find_all_by_title(title).each(&:destroy)

      # Create a redirect to the new title

      wiki.redirects << WikiRedirect.new(:title => @previous_title, :redirects_to => title) unless redirect_existing_links == "0"

      @previous_title = nil

    end

  end

  def before_destroy

    # Remove redirects to this page

    wiki.redirects.find_all_by_redirects_to(title).each(&:destroy)

  end

  def pretty_title

    WikiPage.pretty_title(title)

  end

  def content_for_version(version=nil)

    result = content.versions.find_by_version(version.to_i) if version

    result ||= content

    result

  end

  def diff(version_to=nil, version_from=nil)

    version_to = version_to ? version_to.to_i : self.content.version

    version_from = version_from ? version_from.to_i : version_to - 1

    version_to, version_from = version_from, version_to unless version_from < version_to

    content_to = content.versions.find_by_version(version_to)

    content_from = content.versions.find_by_version(version_from)

    (content_to && content_from) ? WikiDiff.new(content_to, content_from) : nil

  end

  def annotate(version=nil)

    version = version ? version.to_i : self.content.version

    c = content.versions.find_by_version(version)

    c ? WikiAnnotate.new(c) : nil

  end

  def self.pretty_title(str)

    (str && str.is_a?(String)) ? str.tr('_', ' ') : str

  end

  def project

    wiki.project

  end

  def text

    content.text if content

  end

  # Returns true if usr is allowed to edit the page, otherwise false

  def editable_by?(usr)

    !protected? || usr.allowed_to?(:protect_wiki_pages, wiki.project)

  end

  def attachments_deletable?(usr=User.current)

    editable_by?(usr) && super(usr)

  end

  def parent_title

    @parent_title || (self.parent && self.parent.pretty_title)

  end

  def parent_title=(t)

    @parent_title = t

    parent_page = t.blank? ? nil : self.wiki.find_page(t)

    self.parent = parent_page

  end

  protected

  def validate

    errors.add(:parent_title, :invalid) if !@parent_title.blank? && parent.nil?

    errors.add(:parent_title, :circular_dependency) if parent && (parent == self || parent.ancestors.include?(self))

    errors.add(:parent_title, :not_same_project) if parent && (parent.wiki_id != wiki_id)

  end

end

class WikiDiff

  attr_reader :diff, :words, :content_to, :content_from

  def initialize(content_to, content_from)

    @content_to = content_to

    @content_from = content_from

    @words = content_to.text.split(/(\s+)/)

    @words = @words.select {|word| word != ' '}

    words_from = content_from.text.split(/(\s+)/)

    words_from = words_from.select {|word| word != ' '}    

    @diff = words_from.diff @words

  end

end

class WikiAnnotate

  attr_reader :lines, :content

  def initialize(content)

    @content = content

    current = content

    current_lines = current.text.split(/\r?\n/)

    @lines = current_lines.collect {|t| [nil, nil, t]}

    positions = []

    current_lines.size.times {|i| positions << i}

    while (current.previous)

      d = current.previous.text.split(/\r?\n/).diff(current.text.split(/\r?\n/)).diffs.flatten

      d.each_slice(3) do |s|

        sign, line = s[0], s[1]

        if sign == '+' && positions[line] && positions[line] != -1

          if @lines[positions[line]][0].nil?

            @lines[positions[line]][0] = current.version

            @lines[positions[line]][1] = current.author

          end

        end

      end

      d.each_slice(3) do |s|

        sign, line = s[0], s[1]

        if sign == '-'

          positions.insert(line, -1)

        else

          positions[line] = nil

        end

      end

      positions.compact!

      # Stop if every line is annotated

      break unless @lines.detect { |line| line[0].nil? }

      current = current.previous

    end

    @lines.each { |line| line[0] ||= current.version }

  end

end