simonbaird

#
# If you want to use helper methods inside your controller's actions
# (even though it is arguably a code smell, ie you should push your
# presentation logic down into views rather than have it in your
# controllers), you can include the helper modules you want, for
# example:
#
#     class ThingController < ActionController::Base
#       include ApplicationHelper
#       include ThingHelper

simonbaird

#
# This is pretty confusing until you know what's going on...
#
# See http://techspry.com/ruby_and_rails/html_safe-and-helpers-in-rails-3-mystery-solved/
# for an explanation...
#
ruby-1.8.7-p334 :025 > foo_safe = "<p>foo</p>".html_safe
 => "<p>foo</p>" 

ruby-1.8.7-p334 :026 > (foo_safe + "<p>bar</p>").html_safe # not what you thought! unintuitive!

simonbaird

# See http://tauday.com/

module Math
  TAU = PI * 2.0
end

if defined? BigMath
  module BigMath
    module_function
    def TAU(prec)

simonbaird

diff --git a/ext/bigdecimal/lib/bigdecimal/math.rb b/ext/bigdecimal/lib/bigdecimal/math.rb
index c17841f..c672cbf 100644
--- a/ext/bigdecimal/lib/bigdecimal/math.rb
+++ b/ext/bigdecimal/lib/bigdecimal/math.rb
@@ -9,6 +9,7 @@ require 'bigdecimal'
 #   atan(x, prec)  Note: |x|<1, x=0.9999 may not converge.
 #   exp (x, prec)
 #   log (x, prec)
+#   TAU (prec)
 #   PI  (prec)

simonbaird

# Dump a mysql database to a gzipped sql file
dbdump() {
  # (adjust defaults as required)
  GZ_FILE=$1; [ ! -n "$GZ_FILE" ] && GZ_FILE="$HOME/.dbdump.gz"
  DB_NAME=$2; [ ! -n "$DB_NAME" ] && DB_NAME='fms'
  echo -n "Dumping database $DB_NAME to $GZ_FILE..."
  # Add --extended-insert=FALSE to mysql command for more readable but MUCH slower sql
  mysqldump -u root $DB_NAME | gzip - > "$GZ_FILE"
  echo ' Done'
}

simonbaird

# Where the magic happens...
module RuntimeInclude
  def get_singleton
    class << self
      self
    end
  end

  def runtime_include(the_module)
    get_singleton.send(:include,the_module)

simonbaird

class Date
  [:beginning_of_fortnight, :end_of_fortnight, :next_fortnight].each do |method|
    define_method(method) do |*args|
      self.to_time.send(method,*args).to_date
    end
  end
end

simonbaird

class Date
  # Going to be lazy here...
  [:beginning_of_fortnight, :end_of_fortnight, :next_fortnight].each do |method|
    define_method(method) do |*args|
      self.to_time.send(method,*args).to_date
    end
  end
end

simonbaird

require 'rubygems'
require 'haml'
# Put a - char on each line in just the right place.
# (Need to remove blank lines too, they cause problems)
haml_source = File.read($0).gsub(/\n+/,"\n").gsub(/^\s*/,'\&-')
begin
  # Run the file with haml
  Haml::Engine.new(haml_source).render
rescue Exception => e
  # Spit out the haml source to make it easier to find your error

simonbaird

#
# Example 1
#
# There are two modules, one for instance methods and one for class methods
# Use 'include' and 'extend' separately
#
module Foo1Instance
  def foo; "instance foo (#{self.class.name})"; end
end