Initial import

.gitignore

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+*.gem
+Gemfile.lock
+.rbx
+.yardoc
+doc
+tags

.travis.yml

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+language: ruby
+cache: bundler
+rvm:
+  - 1.9.3
+  - 2.0.0
+  - 2.1.0
+  - rbx

Gemfile

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+source 'https://rubygems.org'
+gemspec

LICENSE.MIT

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+Copyright (c) 2012 Conrad Irwin <[email protected]>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

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+# pry-timetravel
+
+DOES NOT WORK. DO NOT USE.
+
+Time travel! For your REPL!
+
+    > x = 5
+    5
+    > checkpoint
+    > x = 10
+    10
+    > timetravel
+    > x
+    5
+
+This is an attempt to package the proof of concept. API WILL CHANGE!
+
+## Meta
+
+Released under the MIT license, see LICENSE.MIT for details. Contributions and bug-reports
+are welcome.

Rakefile

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+require 'rspec/core/rake_task'
+
+task :default => :test
+task :spec => :test
+
+RSpec::Core::RakeTask.new(:test)
+
+task :build do
+  sh 'gem build *.gemspec'
+end
+
+task :install => :build do
+  sh 'gem install *.gem'
+end

lib/pry-timetravel.rb

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+require 'rubygems'
+require 'pry'
+
+require File.expand_path('../pry-timetravel/commands', __FILE__)
+
+class PryTimetravel
+  class << self
+
+    def dlog(msg)
+      File.open("meta.log", 'a') do |file|
+        file.puts(msg)
+      end
+    end
+
+    def checkpoint
+      parent_pid = $$
+      child_pid = fork
+      if child_pid
+        dlog("PARENT #{parent_pid}: I have a child pid #{child_pid}")
+
+        @previous_pid ||= []
+        @previous_pid.push child_pid
+
+        # The parent universe freezes
+        #  dlog("PARENT #{$$}: I am suspending. My child is #{parent_pid}")
+        #  dlog("PARENT #{$$}: suspending")
+        #  Process.setpgrp
+        #  Process.setsid
+        #  dlog("PARENT #{$$}: resumed!")
+      else
+        child_pid = $$
+
+        dlog("CHILD: #{child_pid}: I have a parent pid #{parent_pid}")
+
+        Process.kill 'SIGSTOP', child_pid
+
+        dlog("CHILD #{child_pid}: resumed!")
+      end
+    end
+
+    def go_back
+      dlog("ME #{$$}: Thinking about time travel...");
+      dlog("ME #{$$}: previous_pid = #{ @previous_pid }");
+      if @previous_pid && ! @previous_pid.empty?
+        previous_pid = @previous_pid.pop
+
+        dlog("ME #{$$}: I found a previous pid #{previous_pid}! TIME TRAVEL TIME")
+        Process.kill 'SIGCONT', previous_pid
+        dlog("ME #{$$}: I resumed pid #{previous_pid}... now time to wait")
+        #  Process.waitpid(previous_pid)
+        Process.waitall
+        dlog("ME #{$$}: If you meet your previous self, kill yourself.")
+        #  Process.kill 'SIGKILL', $$
+        Kernel.exit!
+      end
+      dlog("ME #{$$}: I was unable to time travel. Maybe it is a myth.");
+    end
+  end
+end
+

lib/pry-timetravel/commands.rb

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+
+Pry::Commands.create_command "checkpoint", "Set a marker in the timeline" do
+  match 'checkpoint'
+  group 'Timetravel'
+  #  description 'Snapshot the world so we can timetravel back here later'
+  banner <<-'BANNER'
+    Usage: checkpoint
+           checkpoint --list
+           checkpoint --delete [INDEX]
+
+    This will add a checkpoint which you can return to later.
+  BANNER
+
+  #  def options(opt)
+    #  opt.on :d, :delete,
+      #  "Delete the checkpoint with the given index. If no index is given delete them all",
+      #  :optional_argument => true, :as => Integer
+    #  opt.on :l, :list,
+      #  "Show all checkpoints"
+  #  end
+  def process
+    PryTimetravel.checkpoint
+  end
+end
+
+Pry::Commands.create_command "timetravel", "Set a marker in the timeline" do
+  match 'timetravel'
+  group 'Timetravel'
+  #  description 'Snapshot the world so we can timetravel back here later'
+  banner <<-'BANNER'
+    Usage: checkpoint
+           checkpoint --list
+           checkpoint --delete [INDEX]
+
+    This will add a checkpoint which you can return to later.
+  BANNER
+
+  #  def options(opt)
+    #  opt.on :d, :delete,
+      #  "Delete the checkpoint with the given index. If no index is given delete them all",
+      #  :optional_argument => true, :as => Integer
+    #  opt.on :l, :list,
+      #  "Show all checkpoints"
+  #  end
+  def process
+    PryTimetravel.go_back
+  end
+end
+

lib/pry/timetravel.rb

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+#Bundler shenanigans
+require 'pry-timetravel'

meta.log

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+CHILD: 21499: I have a parent pid 21493
+PARENT 21493: I have a child pid 21499
+ME 21493: Thinking about time travel...
+ME 21493: previous_pid = [21499]
+ME 21493: I found a previous pid 21499! TIME TRAVEL TIME
+ME 21493: I resumed pid 21499... now time to wait
+PARENT 21534: I have a child pid 21551
+CHILD: 21551: I have a parent pid 21534
+ME 21534: Thinking about time travel...
+ME 21534: previous_pid = [21551]
+ME 21534: I found a previous pid 21551! TIME TRAVEL TIME
+ME 21534: I resumed pid 21551... now time to wait

pry-timetravel.gemspec

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+Gem::Specification.new do |s|
+  s.name          = 'pry-timetravel'
+  s.version       = '0.0.1'
+  s.summary       = 'Timetravel'
+  s.description   = 'Allows you to timetravel!'
+  s.homepage      = 'https://github.com/awwaiid/pry-timetravel'
+  s.email         = ['[email protected]']
+  s.authors       = ['Brock Wilcox']
+  s.files         = `git ls-files`.split("\n")
+  s.require_paths = ['lib']
+
+  s.add_dependency 'pry'
+
+  s.add_development_dependency 'rake'
+  #  s.add_development_dependency 'rspec'
+  #  s.add_development_dependency 'yard'
+  #  s.add_development_dependency 'redcarpet'
+  #  s.add_development_dependency 'capybara'
+end

spec/commands_spec.rb

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+require './spec/spec_helper'
+
+describe "pry-timetravel commands" do
+  describe "checkpoint" do
+    it "forks a child"
+  end
+  describe "timetravel" do
+    it "reinvokes the saved checkpoint and kills itself"
+  end
+end
+

spec/spec_helper.rb

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+require 'rspec'
+require 'rspec/autorun'
+
+require 'pry/test/helper'
+
+require './lib/pry-timetravel'