Hack github's contribution history

run.rb

require 'git'
require 'fileutils'
require 'date'

begin
  FileUtils.rm_rf('.git/')
  File.delete('myfile.out')
rescue Errno::ENOENT
end

File.open('myfile.out', 'a') { |f|
  f.puts "This files holds all the commits..."
}

g = Git.init
g.add(all: true)
g.commit_all('initialize repo..')

10.times do |iteration|
  405.downto(0).each do |i|
    File.open('myfile.out', 'a') { |f|
      f.puts i
    }
    date = (Date.today - i)
    date_time = DateTime.new(date.year, date.month, date.day, rand(0...24), rand(0...60), rand(0...60)).strftime("%a, %d %b %Y %H:%M:%S %z")

    g.add(all: true)
    system(%Q{GIT_COMMITTER_DATE="#{date_time}" git commit --date "#{date_time}" -am "Changes...#{date_time}"})
  end
end