DavidEGrayson’s gists

DavidEGrayson / test_spec.rb

Created October 26, 2012 18:27

RSpec lets you call should_receive and such on normal objects

	class Foo
	def query(q)
	puts "Foo received query #{q}"
	end

	alias query_alternate query
	end

	describe RSpec do
	before :all do

DavidEGrayson / idea1.rb

Created January 13, 2013 22:05

These are my ideas for how to implement helpers using Ruby 2.0 refinements. See http://blog.davidegrayson.com/2013/01/ruby-20-helpers-should-be-refinements.html

	# This fails. I think the refinements are loaded into the scope
	# only when #using is called, and additional refinements that are
	# added to the Helpers module later have no effect.

	module Helpers
	refine Class do
	def helper(mod)
	klass = self
	Helpers.module_exec do
	puts "#{klass} wants to use #{mod}, self=#{self}"

DavidEGrayson / CppAbstract.cpp

Created January 15, 2013 01:36

	PololuLedStrip<11> ledStrip11;
	PololuLedStripBase * ledStrips[] =
	{
	&ledStrip11,
	&PololuLedStrip<12>(), // warning: taking address of temporary [-fpermissive]
	};

DavidEGrayson / error.txt

Created January 16, 2013 00:07

Error I got when trying to load the RedCloth gem 4.2.3 in Ruby 1.9.3 (in Rails 3.2.11)

	$ rake
	rake aborted!
	(<unknown>): did not find expected node content while parsing a block node at line 183 column 9
	/home/david/.rvm/gems/ruby-1.9.3-p362@system2/gems/RedCloth-4.2.3/lib/redcloth/formatters/latex.rb:6:in `<module:LATEX>'
	/home/david/.rvm/gems/ruby-1.9.3-p362@system2/gems/RedCloth-4.2.3/lib/redcloth/formatters/latex.rb:3:in `<top (required)>'
	/home/david/.rvm/gems/ruby-1.9.3-p362@system2/gems/RedCloth-4.2.3/lib/redcloth.rb:21:in `require'
	/home/david/.rvm/gems/ruby-1.9.3-p362@system2/gems/RedCloth-4.2.3/lib/redcloth.rb:21:in `<top (required)>'
	/home/david/.rvm/gems/ruby-1.9.3-p362@system2/gems/RedCloth-4.2.3/lib/case_sensitive_require/RedCloth.rb:6:in `require'
	/home/david/.rvm/gems/ruby-1.9.3-p362@system2/gems/RedCloth-4.2.3/lib/case_sensitive_require/RedCloth.rb:6:in `<top (required)>'
	/home/david/.rvm/gems/ruby-1.9.3-p362@system2/gems/bundler-1.2.3/lib/bundler/runtime.rb:68:in `require'

DavidEGrayson / gist:4774407

Last active December 12, 2015 12:49

Is this a bug in Ruby? The BigDecimal#eql? doesn't care about the type of the objects being compared, but generally #eql? for numeric types does care about the types. This is consistent with the documentation but seems wrong, and results in asymmetric behavior as shown below. The docs are here: http://www.ruby-doc.org/core-1.9.3/Numeric.html#met…

	1.9.3p374 :002 > BigDecimal('6').eql? 6
	=> true
	1.9.3p374 :003 > 6.eql? BigDecimal('6')
	=> false

DavidEGrayson / JRuby irb

Created April 1, 2013 21:08

There are two ways to load a Java class from JRuby. The one that uses camel-case constants gives a much more helpful error message when something goes wrong loading the class. See below.

	irb(main):024:0> com.microchip.mplab.mdbcore.platformtool.PlatformToolMetaManager
	NameError: missing class or uppercase package name (`com.microchip.mplab.mdbcore.platformtool.Platfo
	rmToolMetaManager')
	from org/jruby/javasupport/JavaUtilities.java:54:in `get_proxy_or_package_under_package'
	from file:/C:/jruby-1.7.3/lib/jruby.jar!/jruby/java/java_package_module_template.rb:14:in `m
	ethod_missing'
	from (irb):24:in `evaluate'
	from org/jruby/RubyKernel.java:1066:in `eval'
	from org/jruby/RubyKernel.java:1409:in `loop'
	from org/jruby/RubyKernel.java:1174:in `catch'

DavidEGrayson / spec.rb

Last active December 15, 2015 19:49

Why you might prefer to use == instead of eq in rspec.

	describe "rspec syntax" do
	describe "==" do
	it "allows line breaks" do
	5.should ==
	5
	end
	end

	describe "eq" do
	it "does not allow line breaks" do

DavidEGrayson / spec.rb

Created April 26, 2013 18:20

Why you might prefer to use eq instead of == in rspec.

	describe 'rspec syntax' do
	let(:x) { 4 }

	describe '==' do
	it 'silently fails if you forget .should' do
	x == 5
	end
	end

	describe 'eq' do

DavidEGrayson / yard_bug1.rb

Last active December 20, 2015 14:38

See https://github.com/lsegal/yard/issues/688

	module YARD
	module Parser
	module Ruby
	# Builds and s-expression by creating {AstNode} objects with
	# the type provided by the first argument.
	#
	# @example An implicit list of keywords
	# ast = s(s(:kw, "if"), s(:kw, "else"))
	# ast.type # => :list
	# @example A method call

DavidEGrayson / output.txt

Created August 4, 2013 21:12

dumb error trying to make a .gem file with JRuby in Windows

	C:\Users\David\Documents\yard_david>jruby -S rake gem
	rake aborted!
	["(eval)"] are not files
	C:/Users/David/Documents/yard_david/Rakefile:11:in `(root)'
	org/jruby/RubyProc.java:255:in `call'
	org/jruby/RubyArray.java:1617:in `each'
	org/jruby/RubyArray.java:1617:in `each'
	org/jruby/RubyKernel.java:1073:in `load'
	Tasks: TOP => gem
	(See full trace by running task with --trace)

David Grayson DavidEGrayson