instiki/app/models/page.rb

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Ruby
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require 'date'
require 'page_lock'
require 'revision'
require 'wiki_words'
require 'chunks/wiki'
class Page
include PageLock
attr_reader :name, :web
attr_accessor :revisions
def initialize(web, name, content, created_at, author)
@web, @name, @revisions = web, name, []
revise(content, created_at, author)
end
def revise(content, created_at, author)
if not @revisions.empty? and content == @revisions.last.content
raise Instiki::ValidationError.new(
"You have tried to save page '#{name}' without changing its content")
end
# A user may change a page, look at it and make some more changes - several times.
# Not to record every such iteration as a new revision, if the previous revision was done
# by the same author, not more than 30 minutes ago, then update the last revision instead of
# creating a new one
if !@revisions.empty? && continous_revision?(created_at, author)
@revisions.last.created_at = created_at
@revisions.last.content = content
@revisions.last.clear_display_cache
else
@revisions << Revision.new(self, @revisions.length, content, created_at, author)
end
self.revisions.last.force_rendering
# at this point the page may not be inserted in the web yet, and therefore
# references to the page itself are rendered as "unresolved". Clearing the cache allows
# the page to re-render itself once again, hopefully _after_ it is inserted in the web
self.revisions.last.clear_display_cache
@web.refresh_pages_with_references(@name) if @revisions.length == 1
end
def rollback(revision_number, created_at, author_ip = nil)
roll_back_revision = @revisions[revision_number].dup
revise(roll_back_revision.content, created_at, Author.new(roll_back_revision.author, author_ip))
end
def revisions?
revisions.length > 1
end
def revised_on
created_on
end
def in_category?(cat)
cat.nil? || cat.empty? || categories.include?(cat)
end
def categories
display_content.find_chunks(Category).map { |cat| cat.list }.flatten
end
def authors
revisions.collect { |rev| rev.author }
end
def references
@web.select.pages_that_reference(name)
end
def linked_from
@web.select.pages_that_link_to(name)
end
def included_from
@web.select.pages_that_include(name)
end
# Returns the original wiki-word name as separate words, so "MyPage" becomes "My Page".
def plain_name
@web.brackets_only ? name : WikiWords.separate(name)
end
# used to build chunk ids.
def id
@id ||= name.unpack('H*').first
end
def link(options = {})
@web.make_link(name, nil, options)
end
def author_link(options = {})
@web.make_link(author, nil, options)
end
private
def continous_revision?(created_at, author)
@revisions.last.author == author && @revisions.last.created_at + 30.minutes > created_at
end
# Forward method calls to the current revision, so the page responds to all revision calls
def method_missing(method_symbol)
revisions.last.send(method_symbol)
end
end