def convert_pixels_to_cms(pixels, dpi) return (pixels / dpi) * 2.54 end
Tag Archive for ruby
Covert Pixels to Centimeters
Compile all css files in a rails project
# compiles all the css files into one huge string
# this is useful when running with less
# USAGE : all_css.open # => opens the string in less allowing you to search
def all_css
css_files = Dir.glob File.join(RAILS_ROOT, "public/stylesheets/","*.css")
css_content = ""
css_files.each {|file| css_content << IO.read(file)}
css_content.instance_eval do
# opens with less command
def open
system('echo "' << self << '"|less')
end
end
css_content
end
port install ruby -> malloc error
# remove locks left behind when the errors aborted the install sudo port -f clean ruby # start fresh sudo port -f uninstall ruby # install without documentation sudo port install ruby +default_variants +no_doc
Match Single-line Javascript Comments
Regexp.new(///.*$/)
Match CSS and JS Comments
# This is how it would look using the Ruby Regexp class # Only match one-line comments Regexp.new(//*.*?*//) # Match single and multi-line comments Regexp.new(//*.*?*//m)
Mixing in a Module immediately after an objects Singleton class
#You can open the class definition body of a singleton class and add instance methods, class methods, and constants #You do this by using the 'class' keyword and a CONSTANT class C def hello puts "this is a hello yo." end end module M def talk puts "hello." end end #Example 1 example1 = C.new class << example1 include M end #Call the Singleton method example1.hello #Call the Module Mix-in example1.talk #Example 2 example2 = C.new example2.extend(M) example2.talk
String split by line
text_with_lines.each do |line| p line.chomp end
Función básica para eliminiar acentos en minúsculas
def quita_acentos( texto)
texto= texto.gsub('á', 'a')
texto= texto.gsub('é', 'e')
texto= texto.gsub('Ã', 'i')
texto= texto.gsub('ó', 'o')
texto= texto.gsub('ú', 'u')
end
REXML Language Identification monkey patch
require 'rexml/document' class REXML::Element public def lang if self.attributes['xml:lang'] return self.attributes['xml:lang'].to_s elsif self.parent != nil return self.parent.lang else return nil end end end describe "XML library" do it "should handle xml:lang inheritance properly" do xmldoc = <<-EOF; <?xml version="1.0" ?> <foo xml:lang="en"> <bar>Hello World!</bar> </foo> EOF xml = REXML::Document.new(xmldoc) xml.elements[1].elements[1].lang.should == "en" xmldoc2 = <<-EOF; <?xml version="1.0" ?> <foo> <bar>Hello World!</bar> </foo> EOF xml2 = REXML::Document.new(xmldoc2) xml2.elements[1].elements[1].lang.should_not == "en" xml2.elements[1].elements[1].lang.should == nil xmldoc3 = <<-EOF; <?xml version="1.0" ?> <foo> <bar xml:lang="en">Hello World!</bar> </foo> EOF xml3 = REXML::Document.new(xmldoc3) xml3.elements[1].elements[1].lang.should == "en" end end