Peter Marreck pmarreck

Former Ruby, currently Elixir developer, Bash shell, exploring Idris and Roc-lang. Cornell grad. Into biking, sailing, gaming, whiskey, EDM, all things tech.

51 followers · 30 following

formerly senior engineer @ desk.com, chief engineer @ thredup.com, software engineer @ lifebooker.com. Director of Engineering @ addigence.com, currently available
Long Island, NY
00:01 (UTC -04:00)
@pmarreck
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pmarreck / ruby class munging.rb

Created January 30, 2013 17:24

futzing around with changing what the inheritance of a class is. (objects made with the old class will still use the old class' inheritance, though)

	bash>> irb
	class A;>> class A; end
	=> nil
	>> class B; end
	=> nil
	>> the_class = A
	=> A
	>> class C < the_class
	>> end
	=> nil

pmarreck / deferred_includes_and_superclass.rb

Created February 1, 2013 21:27

Problem: You want to be able to load a class without also having to load all its dependencies as a prerequisite, such as in a unit test.

	# Problem: You want to be able to load a class without also having to load all its
	# dependencies as a prerequisite, such as in a unit test

	# test module

	module BucketOMethods
	def hi
	puts 'hi'; 'hi'
	end
	end

pmarreck / wtf.rb

Created February 3, 2013 21:18

ruby, wtf

	>> a=lambda{:this};b=lambda{:this};a==b
	=> true
	>> a=lambda{:this}
	=> #<Proc:0x007f9d5a8c4430@(irb):24 (lambda)>
	>> b=lambda{:this}
	=> #<Proc:0x007f9d5a8bade0@(irb):25 (lambda)>
	>> a==b
	=> false

pmarreck / inconceivable.rb

Last active December 12, 2015 04:39

an insurmountable bundler problem?

	Bundler could not find compatible versions for gem "bundler":
	In Gemfile:
	rails (= 3.0) ruby depends on
	bundler (~> 1.0.0) ruby

	Current Bundler version:
	bundler (1.2.3)

	This Gemfile requires a different version of Bundler.
	Perhaps you need to update Bundler by running `gem install bundler`?

pmarreck / branch_specific_db.yaml

Created February 15, 2013 16:31

A little database.yml hack to get git-branch-specific databases. As a prereq you need the git-branch.bash script that will define parse_git_branch which returns your current git branch (found elsewhere).

	<%
	db_name = nil
	if ENV['SPECIFIC_DB']
	db_name = ENV['SPECIFIC_DB'].strip
	else
	cur_branch = `source ~/bin/git-branch.bash; parse_git_branch`.strip
	db_name = cur_branch
	end
	db_name = db_name.gsub(/[\/\.]/,'_')
	test_db = db_name + '_test' + ENV['TEST_ENV_NUMBER'].to_s

pmarreck / enumerable_self_referential_detect.rb

Created February 19, 2013 16:59

Detect a recursive data structure in Ruby

	module Enumerable
	def recursive?(oids = {})
	if oids.key?(self.object_id)
	return true
	else
	oids[self.object_id] = 1
	return any?{ \|v\| v.recursive?(oids) if v.respond_to?(:recursive?) }
	end
	return false
	end

pmarreck / make.log

Created February 25, 2013 21:08

Can't build ruby 2.0

	[2013-02-25 15:41:08] make
	CC = /usr/local/bin/gcc-4.2
	LD = ld
	LDSHARED = /usr/local/bin/gcc-4.2 -dynamic -bundle
	CFLAGS = -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Werror=pointer-arith -Werror=write-strings -Werror=declaration-after-statement -Werror=shorten-64-to-32 -Werror=implicit-function-declaration -pipe
	XCFLAGS = -include ruby/config.h -include ruby/missing.h -D_FORTIFY_SOURCE=2 -fstack-protector -fno-strict-overflow -fvisibility=hidden -DRUBY_EXPORT -fPIE
	CPPFLAGS = -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT -I/Users/pmarreck/.rvm/usr/include -I/Users/pmarreck/.rvm/usr/include -I. -I.ext/include/x86_64-darwin11.4.2 -I./include -I.
	DLDFLAGS = -Wl,-undefined,dynamic_lookup -Wl,-multiply_defined,suppress -L/Users/pmarreck/.rvm/usr/lib -L/Users/pmarreck/.rvm/usr/lib -fstack-protector -Wl,-u,_objc_msgSend -pie
	SOLIBS =
	compiling main.c

pmarreck / lambda-ize_scopes.rb

Created February 27, 2013 18:06

A search/replace regex (this one works in Sublime) to help convert Rails ActiveRecord non-lambda scopes into lambda scopes

	# Search for:

	/,\s((?:where\|order\|select)\(.+\))/

	# Replace with:

	', lambda{ \1 }'

pmarreck / ruby_array_insert_every.rb

Last active December 14, 2015 14:58

Array#insert_every(skip, elem) An insert_every method for Ruby arrays.

	class Array
	def insert_every!(skip, str)
	orig_ary_length = self.length
	new_ary_length = orig_ary_length + ((orig_ary_length-1) / skip)
	i = skip
	while(i<new_ary_length) do self.insert(i,str); i+=(skip+1) end
	self
	end
	end

pmarreck / roman_numeral.rb

Last active December 14, 2015 14:59

Roman numerals in Ruby

	class String
	def to_arabic_numeral
	if self =~ RomanNumeral::REGEXP
	# The following is some insane magic I won't even touch, but it would work
	# n=s=0;bytes{\|c\|s+=n-2n%n=10*(205558%c%7)%9995};s+n
	RomanNumeral.get(self)
	else
	raise "String is not a Roman numeral"
	end
	end

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