is also an example
def excerpt(text, phrase, *args)
options = args.extract_options!
unless args.empty?
options[:radius] = args[0] || 100
options[:omission] = args[1] || "..."
end
options.reverse_merge!(:radius => 100, :omission => "...")
if text && phrase
phrase = Regexp.escape(phrase)
if found_pos = text.mb_chars =~ /(#{phrase})/i
start_pos = [ found_pos - options[:radius], 0 ].max
end_pos = [ [ found_pos + phrase.mb_chars.length + options[:radius] - 1, 0].max, text.mb_chars.length ].min
prefix = start_pos > 0 ? options[:omission] : ""
postfix = end_pos < text.mb_chars.length - 1 ? options[:omission] : ""
prefix + text.mb_chars[start_pos..end_pos].strip + postfix
else
nil
end
end
end
# Attempts to pluralize the +singular+ word unless +count+ is 1. If
# +plural+ is supplied, it will use that when count is > 1, otherwise
# it will use the Inflector to determine the plural form
#
# ==== Examples
# pluralize(1, 'person')
# # => 1 person
#
# pluralize(2, 'person')
# # => 2 people
#
# pluralize(3, 'person', 'users')
# # => 3 users
#
# pluralize(0, 'person')
# # => 0 people
def pluralize(count, singular, plural = nil)
"#{count || 0} " + ((count == 1 || count =~ /^1(\.0+)?$/) ? singular : (plural || singular.pluralize))
end
# Wraps the +text+ into lines no longer than +line_width+ width. This method
# breaks on the first whitespace character that does not exceed +line_width+
# (which is 80 by default).
#
# ==== Examples
#
# word_wrap('Once upon a time')
# # => Once upon a time
#
# word_wrap('Once upon a time, in a kingdom called Far Far Away, a king fell ill, and finding a successor to the throne turned out to be more trouble than anyone could have imagined...')
# # => Once upon a time, in a kingdom called Far Far Away, a king fell ill, and finding\n a successor to the throne turned out to be more trouble than anyone could have\n imagined...
#
# word_wrap('Once upon a time', :line_width => 8)
# # => Once upon\na time
#
# word_wrap('Once upon a time', :line_width => 1)
# # => Once\nupon\na\ntime
#
# You can still use word_wrap with the old API that accepts the
# +line_width+ as its optional second parameter:
# word_wrap('Once upon a time', 8) # => Once upon\na time
def word_wrap(text, *args)
options = args.extract_options!
unless args.blank?
options[:line_width] = args[0] || 80
end
options.reverse_merge!(:line_width => 80)
text.split("\n").collect do |line|
line.length > options[:line_width] ? line.gsub(/(.{1,#{options[:line_width]}})(\s+|$)/, "\\1\n").strip : line
end * "\n"
end
# Returns the text with all the Textile[http://www.textism.com/tools/textile] codes turned into HTML tags.
#
# You can learn more about Textile's syntax at its website[http://www.textism.com/tools/textile].
# This method is only available if RedCloth[http://redcloth.org/] is available.
#
# ==== Examples
# textilize("*This is Textile!* Rejoice!")
# # => "This is Textile! Rejoice!
"
#
# textilize("I _love_ ROR(Ruby on Rails)!")
# # => "I love ROR!
"
#
# textilize("h2. Textile makes markup -easy- simple!")
# # => "Textile makes markup easy simple!
"
#
# textilize("Visit the Rails website "here":http://www.rubyonrails.org/.)
# # => "Visit the Rails website here.
"
#
# textilize("This is worded strongly")
# # => "This is worded strongly
"
#
# textilize("This is worded strongly", :filter_html)
# # => "This is worded <strong>strongly</strong>
"
#
def textilize(text, *options)
options ||= [:hard_breaks]
if text.blank?
""
else
textilized = RedCloth.new(text, options)
textilized.to_html
end
end
# Returns the text with all the Textile codes turned into HTML tags,
# but without the bounding tag that RedCloth adds.
#
# You can learn more about Textile's syntax at its website[http://www.textism.com/tools/textile].
# This method is only available if RedCloth[http://redcloth.org/] is available.
#
# ==== Examples
# textilize_without_paragraph("*This is Textile!* Rejoice!")
# # => "This is Textile! Rejoice!"
#
# textilize_without_paragraph("I _love_ ROR(Ruby on Rails)!")
# # => "I love ROR!"
#
# textilize_without_paragraph("h2. Textile makes markup -easy- simple!")
# # => "
Textile makes markup easy simple!
"
#
# textilize_without_paragraph("Visit the Rails website "here":http://www.rubyonrails.org/.)
# # => "Visit the Rails website here."
def textilize_without_paragraph(text)
textiled = textilize(text)
if textiled[0..2] == "" then textiled = textiled[3..-1] end
if textiled[-4..-1] == "
" then textiled = textiled[0..-5] end
return textiled
end
# Returns the text with all the Markdown codes turned into HTML tags.
# This method requires BlueCloth[http://www.deveiate.org/projects/BlueCloth]
# to be available.
#
# ==== Examples
# markdown("We are using __Markdown__ now!")
# # => "We are using Markdown now!
"
#
# markdown("We like to _write_ `code`, not just _read_ it!")
# # => "We like to write code, not just read it!
"
#
# markdown("The [Markdown website](http://daringfireball.net/projects/markdown/) has more information.")
# # => "The Markdown website
# # has more information.
"
#
# markdown('')
# # => '
'
def markdown(text)
text.blank? ? "" : BlueCloth.new(text).to_html
end
# Returns +text+ transformed into HTML using simple formatting rules.
# Two or more consecutive newlines(\n\n) are considered as a
# paragraph and wrapped in tags. One newline (\n) is
# considered as a linebreak and a
tag is appended. This
# method does not remove the newlines from the +text+.
#
# You can pass any HTML attributes into html_options. These
# will be added to all created paragraphs.
# ==== Examples
# my_text = "Here is some basic text...\n...with a line break."
#
# simple_format(my_text)
# # => "
Here is some basic text...\n
...with a line break.
"
#
# more_text = "We want to put a paragraph...\n\n...right there."
#
# simple_format(more_text)
# # => "We want to put a paragraph...
\n\n...right there.
"
#
# simple_format("Look ma! A class!", :class => 'description')
# # => "Look ma! A class!
"
def simple_format(text, html_options={})
start_tag = tag('p', html_options, true)
text = h(text)
text.gsub!(/\r\n?/, "\n") # \r\n and \r -> \n
text.gsub!(/\n\n+/, "\n\n#{start_tag}") # 2+ newline -> paragraph
text.gsub!(/([^\n]\n)(?=[^\n])/, '\1
') # 1 newline -> br
text.insert 0, start_tag
text.safe_concat("")
end
# Turns all URLs and e-mail addresses into clickable links. The :link option
# will limit what should be linked. You can add HTML attributes to the links using
# :html. Possible values for :link are :all (default),
# :email_addresses, and :urls. If a block is given, each URL and
# e-mail address is yielded and the result is used as the link text.
#
# ==== Examples
# auto_link("Go to http://www.rubyonrails.org and say hello to david@loudthinking.com")
# # => "Go to http://www.rubyonrails.org and
# # say hello to david@loudthinking.com"
#
# auto_link("Visit http://www.loudthinking.com/ or e-mail david@loudthinking.com", :link => :urls)
# # => "Visit http://www.loudthinking.com/
# # or e-mail david@loudthinking.com"
#
# auto_link("Visit http://www.loudthinking.com/ or e-mail david@loudthinking.com", :link => :email_addresses)
# # => "Visit http://www.loudthinking.com/ or e-mail david@loudthinking.com"
#
# post_body = "Welcome to my new blog at http://www.myblog.com/. Please e-mail me at me@email.com."
# auto_link(post_body, :html => { :target => '_blank' }) do |text|
# truncate(text, 15)
# end
# # => "Welcome to my new blog at http://www.m....
# Please e-mail me at me@email.com."
#
#
# You can still use auto_link with the old API that accepts the
# +link+ as its optional second parameter and the +html_options+ hash
# as its optional third parameter:
# post_body = "Welcome to my new blog at http://www.myblog.com/. Please e-mail me at me@email.com."
# auto_link(post_body, :urls) # => Once upon\na time
# # => "Welcome to my new blog at http://www.myblog.com.
# Please e-mail me at me@email.com."
#
# auto_link(post_body, :all, :target => "_blank") # => Once upon\na time
# # => "Welcome to my new blog at http://www.myblog.com.
# Please e-mail me at me@email.com."
def auto_link(text, *args, &block)#link = :all, html = {}, &block)
return '' if text.blank?
options = args.size == 2 ? {} : args.extract_options! # this is necessary because the old auto_link API has a Hash as its last parameter
unless args.empty?
options[:link] = args[0] || :all
options[:html] = args[1] || {}
end
options.reverse_merge!(:link => :all, :html => {})
case options[:link].to_sym
when :all then auto_link_email_addresses(auto_link_urls(text, options[:html], &block), options[:html], &block)
when :email_addresses then auto_link_email_addresses(text, options[:html], &block)
when :urls then auto_link_urls(text, options[:html], &block)
end
end
# Creates a Cycle object whose _to_s_ method cycles through elements of an
# array every time it is called. This can be used for example, to alternate
# classes for table rows. You can use named cycles to allow nesting in loops.
# Passing a Hash as the last parameter with a :name key will create a
# named cycle. The default name for a cycle without a +:name+ key is
# "default". You can manually reset a cycle by calling reset_cycle
# and passing the name of the cycle. The current cycle string can be obtained
# anytime using the current_cycle method.
#
# ==== Examples
# # Alternate CSS classes for even and odd numbers...
# @items = [1,2,3,4]
#
# <% @items.each do |item| %>
# ">
# | item |
#
# <% end %>
#
#
#
# # Cycle CSS classes for rows, and text colors for values within each row
# @items = x = [{:first => 'Robert', :middle => 'Daniel', :last => 'James'},
# {:first => 'Emily', :middle => 'Shannon', :maiden => 'Pike', :last => 'Hicks'},
# {:first => 'June', :middle => 'Dae', :last => 'Jones'}]
# <% @items.each do |item| %>
# "row_class") -%>">
# |
# <% item.values.each do |value| %>
# <%# Create a named cycle "colors" %>
# "colors") -%>">
# <%= value %>
#
# <% end %>
# <% reset_cycle("colors") %>
# |
#
# <% end %>
def cycle(first_value, *values)
if (values.last.instance_of? Hash)
params = values.pop
name = params[:name]
else
name = "default"
end
values.unshift(first_value)
cycle = get_cycle(name)
if (cycle.nil? || cycle.values != values)
cycle = set_cycle(name, Cycle.new(*values))
end
return cycle.to_s
end
# Returns the current cycle string after a cycle has been started. Useful
# for complex table highlighting or any other design need which requires
# the current cycle string in more than one place.
#
# ==== Example
# # Alternate background colors
# @items = [1,2,3,4]
# <% @items.each do |item| %>
# ">
# <%= item %>
#
# <% end %>
def current_cycle(name = "default")
cycle = get_cycle(name)
cycle.current_value unless cycle.nil?
end
# Resets a cycle so that it starts from the first element the next time
# it is called. Pass in +name+ to reset a named cycle.
#
# ==== Example
# # Alternate CSS classes for even and odd numbers...
# @items = [[1,2,3,4], [5,6,3], [3,4,5,6,7,4]]
#
# <% @items.each do |item| %>
# ">
# <% item.each do |value| %>
# "colors") -%>">
# <%= value %>
#
# <% end %>
#
# <% reset_cycle("colors") %>
#
# <% end %>
#
def reset_cycle(name = "default")
cycle = get_cycle(name)
cycle.reset unless cycle.nil?
end
class Cycle #:nodoc:
attr_reader :values
def initialize(first_value, *values)
@values = values.unshift(first_value)
reset
end
def reset
@index = 0
end
def current_value
@values[previous_index].to_s
end
def to_s
value = @values[@index].to_s
@index = next_index
return value
end
private
def next_index
step_index(1)
end
def previous_index
step_index(-1)
end
def step_index(n)
(@index + n) % @values.size
end
end
private
# The cycle helpers need to store the cycles in a place that is
# guaranteed to be reset every time a page is rendered, so it
# uses an instance variable of ActionView::Base.
def get_cycle(name)
@_cycles = Hash.new unless defined?(@_cycles)
return @_cycles[name]
end
def set_cycle(name, cycle_object)
@_cycles = Hash.new unless defined?(@_cycles)
@_cycles[name] = cycle_object
end
AUTO_LINK_RE = %r{
( https?:// | www\. )
[^\s<]+
}x unless const_defined?(:AUTO_LINK_RE)
BRACKETS = { ']' => '[', ')' => '(', '}' => '{' }
# Turns all urls into clickable links. If a block is given, each url
# is yielded and the result is used as the link text.
def auto_link_urls(text, html_options = {})
link_attributes = html_options.stringify_keys
text.gsub(AUTO_LINK_RE) do
href = $&
punctuation = []
left, right = $`, $'
# detect already linked URLs and URLs in the middle of a tag
if left =~ /<[^>]+$/ && right =~ /^[^>]*>/
# do not change string; URL is already linked
href
else
# don't include trailing punctuation character as part of the URL
while href.sub!(/[^\w\/-]$/, '')
punctuation.push $&
if opening = BRACKETS[punctuation.last] and href.scan(opening).size > href.scan(punctuation.last).size
href << punctuation.pop
break
end
end
link_text = block_given?? yield(href) : href
href = 'http://' + href unless href =~ %r{^[a-z]+://}i
content_tag(:a, h(link_text), link_attributes.merge('href' => href)) + punctuation.reverse.join('')
end
end
end
# Turns all email addresses into clickable links. If a block is given,
# each email is yielded and the result is used as the link text.
def auto_link_email_addresses(text, html_options = {})
body = text.dup
text.gsub(/([\w\.!#\$%\-+]+@[A-Za-z0-9\-]+(\.[A-Za-z0-9\-]+)+)/) do
text = $1
if body.match(/]*>(.*)(#{Regexp.escape(text)})(.*)<\/a>/)
text
else
display_text = (block_given?) ? yield(text) : text
mail_to text, display_text, html_options
end
end
end
end
end
end