instiki/app/helpers/application_helper.rb

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# The methods added to this helper will be available to all templates in the application.
module ApplicationHelper
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require 'stringsupport'
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# Accepts a container (hash, array, enumerable, your type) and returns a string of option tags. Given a container
# where the elements respond to first and last (such as a two-element array), the "lasts" serve as option values and
# the "firsts" as option text. Hashes are turned into this form automatically, so the keys become "firsts" and values
# become lasts. If +selected+ is specified, the matching "last" or element will get the selected option-tag.
#
# Examples (call, result):
# html_options([["Dollar", "$"], ["Kroner", "DKK"]])
# <option value="$">Dollar</option>\n<option value="DKK">Kroner</option>
#
# html_options([ "VISA", "Mastercard" ], "Mastercard")
# <option>VISA</option>\n<option selected>Mastercard</option>
#
# html_options({ "Basic" => "$20", "Plus" => "$40" }, "$40")
# <option value="$20">Basic</option>\n<option value="$40" selected>Plus</option>
def html_options(container, selected = nil)
container = container.to_a if Hash === container
html_options = container.inject([]) do |options, element|
if element.is_a? Array
if element.last != selected
options << "<option value=\"#{element.last}\">#{element.first}</option>"
else
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options << "<option value=\"#{element.last}\" selected=\"selected\">#{element.first}</option>"
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end
else
options << ((element != selected) ? "<option>#{element}</option>" : "<option selected>#{element}</option>")
end
end
html_options.join("\n")
end
# Creates a hyperlink to a Wiki page, without checking if the page exists or not
def link_to_existing_page(page, text = nil, html_options = {})
link_to(
text || page.plain_name,
{:web => @web.address, :action => 'show', :id => page.name, :only_path => true},
html_options)
end
# Creates a hyperlink to a Wiki page, or to a "new page" form if the page doesn't exist yet
def link_to_page(page_name, web = @web, text = nil, options = {})
raise 'Web not defined' if web.nil?
UrlGenerator.new(@controller).make_link(@web, page_name, web, text,
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options.merge(:base_url => "#{base_url}/#{web.address}"))
end
def author_link(page, options = {})
UrlGenerator.new(@controller).make_link(@web, page.author.name, page.web, nil, options)
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end
# Create a hyperlink to a particular revision of a Wiki page
def link_to_revision(page, revision_number, text = nil, mode = nil, html_options = {})
revision_number == page.revisions.size ?
link_to(
text || page.plain_name,
{:web => @web.address, :action => 'show', :id => page.name,
:mode => mode}, html_options) :
link_to(
text || page.plain_name + "(rev # #{revision_number})",
{:web => @web.address, :action => 'revision', :id => page.name,
:rev => revision_number, :mode => mode}, html_options)
end
# Create a hyperlink to the history of a particular Wiki page
def link_to_history(page, text = nil, html_options = {})
link_to(
text || page.plain_name + "(history)",
{:web => @web.address, :action => 'history', :id => page.name},
html_options)
end
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def base_url
home_page_url = url_for :controller => 'admin', :action => 'create_system', :only_path => true
home_page_url.sub(%r-/create_system/?$-, '')
end
# Creates a menu of categories
def categories_menu
if @categories.empty?
''
else
"<div id=\"categories\">\n" +
'<strong>Categories</strong>:' +
'[' + link_to_unless_current('Any', :web => @web.address, :action => self.action_name, :category => nil) + "]\n" +
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@categories.map { |c|
link_to_unless_current(c, :web => @web.address, :action => self.action_name, :category => c)
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}.join(', ') + "\n" +
'</div>'
end
end
# Performs HTML escaping on text, but keeps linefeeds intact (by replacing them with <br/>)
def escape_preserving_linefeeds(text)
h(text).gsub(/\n/, '<br/>').as_utf8
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end
def format_date(date, include_time = true)
# Must use DateTime because Time doesn't support %e on at least some platforms
if include_time
DateTime.new(date.year, date.mon, date.day, date.hour, date.min, date.sec).strftime("%B %e, %Y %H:%M:%S")
else
DateTime.new(date.year, date.mon, date.day).strftime("%B %e, %Y")
end
end
def rendered_content(page)
PageRenderer.new(page.revisions.last).display_content
end
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def truncate(text, *args)
options = args.extract_options!
options.reverse_merge!(:length => 30, :omission => "...")
return text if text.num_chars <= options[:length]
len = options[:length] - options[:omission].as_utf8.num_chars
t = ''
text.split.collect do |word|
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if t.num_chars + word.num_chars <= len
t << word + ' '
else
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return t.chop + options[:omission]
end
end
end
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end