require 'diff' class Revision < ActiveRecord::Base belongs_to :page composed_of :author, :mapping => [ %w(author name), %w(ip ip) ] # TODO this method belongs in the view helpers (only views use it) def pretty_created_on # Must use DateTime because Time doesn't support %e on at least some platforms DateTime.new( revised_at.year, revised_at.mon, revised_at.day, revised_at.hour, revised_at.min, revised_at.sec ).strftime "%B %e, %Y %H:%M:%S" end # Returns an array of all the WikiIncludes present in the content of this revision. def wiki_includes unless @wiki_includes_cache chunks = display_content.find_chunks(Include) @wiki_includes_cache = chunks.map { |c| ( c.escaped? ? nil : c.page_name ) }.compact.uniq end @wiki_includes_cache end # Returns an array of all the WikiReferences present in the content of this revision. def wiki_references unless @wiki_references_cache chunks = display_content.find_chunks(WikiChunk::WikiReference) @wiki_references_cache = chunks.map { |c| ( c.escaped? ? nil : c.page_name ) }.compact.uniq end @wiki_references_cache end # Returns an array of all the WikiWords present in the content of this revision. def wiki_words unless @wiki_words_cache wiki_chunks = display_content.find_chunks(WikiChunk::WikiLink) @wiki_words_cache = wiki_chunks.map { |c| ( c.escaped? ? nil : c.page_name ) }.compact.uniq end @wiki_words_cache end # Returns an array of all the WikiWords present in the content of this revision. # that already exists as a page in the web. def existing_pages wiki_words.select { |wiki_word| page.web.page(wiki_word) } end # Returns an array of all the WikiWords present in the content of this revision # that *doesn't* already exists as a page in the web. def unexisting_pages wiki_words - existing_pages end # Explicit check for new type of display cache with chunks_by_type method. # Ensures new version works with older snapshots. def display_content unless @display_cache && @display_cache.respond_to?(:chunks_by_type) @display_cache = WikiContent.new(self) @display_cache.render! end @display_cache end # TODO this probably doesn't belong in revision (because it has to call back the page) def display_diff previous_revision = page.previous_revision(self) if previous_revision HTMLDiff.diff(previous_revision.display_content, display_content) else display_content end end def clear_display_cache @wiki_words_cache = @published_cache = @display_cache = @wiki_includes_cache = @wiki_references_cache = nil end def display_published unless @published_cache && @published_cache.respond_to?(:chunks_by_type) @published_cache = WikiContent.new(self, {:mode => :publish}) @published_cache.render! end @published_cache end def display_content_for_export WikiContent.new(self, {:mode => :export} ).render! end def force_rendering begin display_content.render! rescue => e logger.error "Failed rendering page #{@name}" logger.error e message = e.message # substitute content with an error message self.content = <<-EOL
Markup engine has failed to render this page, raising the following error:
#{message}
#{self.content}EOL clear_display_cache raise e end end protected after_create :force_rendering after_save :clear_display_cache end