blog/source/_helpers.rb

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2009-10-19 00:07:36 +00:00
gem 'activesupport', ">= 2.3.2"
require 'active_support'
require 'rubypants'
module Helpers
module EscapeHelper
HTML_ESCAPE = { '&' => '&amp; ', '>' => '&gt;', '<' => '&lt;', '"' => '&quot;' }
JSON_ESCAPE = { '&' => '\u0026 ', '>' => '\u003E', '<' => '\u003C' }
# A utility method for escaping HTML tag characters.
# This method is also aliased as <tt>h</tt>.
#
# In your ERb templates, use this method to escape any unsafe content. For example:
# <%=h @person.name %>
#
# ==== Example:
# puts html_escape("is a > 0 & a < 10?")
# # => is a &gt; 0 &amp; a &lt; 10?
def html_escape(html)
html.to_s.gsub(/[&"><]/) { |special| HTML_ESCAPE[special] }
end
def escape_once(html)
html.to_s.gsub(/[\"><]|&(?!([a-zA-Z]+|(#\d+));)/) { |special| HTML_ESCAPE[special] }
end
alias h escape_once
# A utility method for escaping HTML entities in JSON strings.
# This method is also aliased as <tt>j</tt>.
#
# In your ERb templates, use this method to escape any HTML entities:
# <%=j @person.to_json %>
#
# ==== Example:
# puts json_escape("is a > 0 & a < 10?")
# # => is a \u003E 0 \u0026 a \u003C 10?
def json_escape(s)
s.to_s.gsub(/[&"><]/) { |special| JSON_ESCAPE[special] }
end
alias j json_escape
end
include EscapeHelper
module ParamsHelper
def params
@params ||= begin
q = request.query.dup
q.each { |(k,v)| q[k.to_s.intern] = v }
q
end
end
end
include ParamsHelper
module TagHelper
def content_tag(name, content, html_options={})
%{<#{name}#{html_attributes(html_options)}>#{content}</#{name}>}
end
def tag(name, html_options={})
%{<#{name}#{html_attributes(html_options)} />}
end
def image_tag(src, html_options = {})
tag(:img, html_options.merge({:src=>src}))
end
def javascript_tag(content = nil, html_options = {})
content_tag(:script, javascript_cdata_section(content), html_options.merge(:type => "text/javascript"))
end
def link_to(name, href, html_options = {})
html_options = html_options.stringify_keys
confirm = html_options.delete("confirm")
onclick = "if (!confirm('#{html_escape(confirm)}')) return false;" if confirm
content_tag(:a, name, html_options.merge(:href => href, :onclick=>onclick))
end
def link_to_function(name, *args, &block)
html_options = {}
html_options = args.pop if args.last.is_a? Hash
function = args[0] || ''
onclick = "#{"#{html_options[:onclick]}; " if html_options[:onclick]}#{function}; return false;"
href = html_options[:href] || '#'
content_tag(:a, name, html_options.merge(:href => href, :onclick => onclick))
end
private
def cdata_section(content)
"<![CDATA[#{content}]]>"
end
def javascript_cdata_section(content) #:nodoc:
"\n//#{cdata_section("\n#{content}\n//")}\n"
end
def html_attributes(options)
unless options.blank?
attrs = []
options.each_pair do |key, value|
if value == true
attrs << %(#{key}="#{key}") if value
else
attrs << %(#{key}="#{value}") unless value.nil?
end
end
" #{attrs.sort * ' '}" unless attrs.empty?
end
end
end
include TagHelper
# My added helpers
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def to_html_email(address)
email = string_to_html(address)
"<a href=\"#{string_to_html('mailto:')}#{email}\">#{email}</a>"
end
def string_to_html(s)
s.strip.unpack("C*").map{|ch| "&#" + ch.to_s + ";" }.to_s
end
def show_part (file)
data = ''
f = File.open(Dir.pwd+"/source/"+file)
f.each_line do |line|
data += line
end
data
end
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def shorten_words (string, word_limit = 25)
words = string.split(/\s/)
if words.size >= word_limit
words[0,(word_limit-1)].join(" ") + '&hellip;'
else
string
end
end
def shorten (string, char_limit = 55)
chars = string.scan(/.{1,1}/)
if chars.size >= char_limit
chars[0,(char_limit-1)].join + '&hellip;'
else
"blah2"
end
end
def absolute_url(input, url)
input.gsub(/(href|src)(\s*=\s*)(["'])(\/.*?)\3/) { $1 + $2 + $3 + url + $4 + $3 }
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end
def rp(input)
RubyPants.new(input).to_html
end
def style_amp(input)
input.gsub(" & "," <span class='amp'>&</span> ")
end
module PartialsHelper
# A very hackish way to handle partials. We'll go with it till it breaks...
def include(partial_name)
file_ext = partial_name[(partial_name.index('.') + 1)..partial_name.length]
contents = IO.read("_includes/#{partial_name}")
case file_ext
when 'haml'
Haml::Engine.new(contents).render(binding)
when 'textile'
RedCloth.new(contents).to_html
when 'markdown'
RDiscount.new(contents).to_html
else
contents
end
end
end
include PartialsHelper
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end
class String
def titlecase
small_words = %w(a an and as at but by en for if in of on or the to v v. via vs vs.)
x = split(" ").map do |word|
# note: word could contain non-word characters!
# downcase all small_words, capitalize the rest
small_words.include?(word.gsub(/\W/, "").downcase) ? word.downcase! : word.smart_capitalize!
word
end
# capitalize first and last words
x.first.to_s.smart_capitalize!
x.last.to_s.smart_capitalize!
# small words after colons are capitalized
x.join(" ").gsub(/:\s?(\W*#{small_words.join("|")}\W*)\s/) { ": #{$1.smart_capitalize} " }
end
def titlecase!
replace(titlecase)
end
def smart_capitalize
# ignore any leading crazy characters and capitalize the first real character
if self =~ /^['"\(\[']*([a-z])/
i = index($1)
x = self[i,self.length]
# word with capitals and periods mid-word are left alone
self[i,1] = self[i,1].upcase unless x =~ /[A-Z]/ or x =~ /\.\w+/
end
self
end
def smart_capitalize!
replace(smart_capitalize)
end
end