require 'diff'
require 'wiki_content'
require 'chunks/wiki'
require 'date'
require 'author'
require 'page'
class Revision
attr_accessor :page, :number, :content, :created_at, :author
def initialize(page, number, content, created_at, author)
@page, @number, @created_at, @author = page, number, created_at, author
self.content = content
@display_cache = nil
end
def created_on
Date.new(@created_at.year, @created_at.mon, @created_at.day)
end
def pretty_created_at
# Must use DateTime because Time doesn't support %e on at least some platforms
DateTime.new(
@created_at.year, @created_at.mon, @created_at.day, @created_at.hour, @created_at.min
).strftime "%B %e, %Y %H:%M"
end
def next_revision
page.revisions[number + 1]
end
def previous_revision
number > 0 ? page.revisions[number - 1] : nil
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.pages[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
def display_diff
previous_revision ? HTMLDiff.diff(previous_revision.display_content, display_content) : display_content
end
def clear_display_cache
@wiki_references_cache = @published_cache = @display_cache = nil
@wiki_includes_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 Exception => e
ApplicationController.logger.error "Failed rendering page #{@name}"
ApplicationController.logger.error e
message = e.message.gsub(/\n/, '
')
# substitute content with an error message
content = <<-EOL
Markup engine has failed to render this page, raising the following error:
#{message}
EOL raise e end end end