instiki/app/models/page_set.rb

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# Container for a set of pages with methods for manipulation.
class PageSet < Array
attr_reader :web
def initialize(web, pages = nil, condition = nil)
@web = web
# if pages is not specified, make a list of all pages in the web
if pages.nil?
super(web.pages.values)
# otherwise use specified pages and condition to produce a set of pages
elsif condition.nil?
super(pages)
else
super(pages.select { |page| condition[page] })
end
end
def most_recent_revision
self.map { |page| page.created_at }.max || Time.at(0)
end
def by_name
PageSet.new(@web, sort_by { |page| page.name })
end
alias :sort :by_name
def by_revision
PageSet.new(@web, sort_by { |page| page.created_at }).reverse
end
def pages_that_reference(page_name)
self.select { |page| page.wiki_words.include?(page_name) }
end
def pages_authored_by(author)
self.select { |page| page.authors.include?(author) }
end
def characters
self.inject(0) { |chars,page| chars += page.content.size }
end
# Returns all the orphaned pages in this page set. That is,
# pages in this set for which there is no reference in the web.
# The HomePage and author pages are always assumed to have
# references and so cannot be orphans
def orphaned_pages
references = web.select.wiki_words + ["HomePage"] + web.select.authors
self.reject { |page| references.include?(page.name) }
end
# Returns all the wiki words in this page set for which
# there are no pages in this page set's web
def wanted_pages
wiki_words - web.select.names
end
def names
self.map { |page| page.name }
end
def wiki_words
self.inject([]) { |wiki_words, page| wiki_words << page.wiki_words }.flatten.uniq
end
def authors
self.inject([]) { |authors, page| authors << page.authors }.flatten.uniq.sort
end
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end