Githug

Git Your Game On

About

Githug is designed to give you a practical way of learning git. It has a series of levels, each utilizing git commands to ensure a correct answer.

Installation

To install Githug

gem install githug

After the gem is installed, you can run githug where you will be prompted to create a directory. Githug should work on Linux, OS X and Windows.

Commands

Githug has 4 commands:

• play - This is the default command and it will check your solution for the current level.
• hint - Gives you a hint (if available) for the current level
• reset - Reset the current level
• test - Used to test levels in development, please see the Testing Levels section.

Change Log

The change log is available on the wiki. Change log

Contributing

If you want to suggest a level or make a level that has been suggested, check out the wiki.

Get yourself on the contributors list by doing the following:

• Fork the repository
• Make a level in the levels directory (covered below)
• Add your level to the LEVELS array inside lib/githug/level.rb in a position that makes sense (the "commit" level after the "add" and "init" levels for example)
• Make sure your level works (covered below)
• Submit a pull request

Todo List

• A better way of returning from the solution block
• A follow up to the level, more information on a specific command, etc.
• More levels!

Writing Levels

Githug has a DSL for writing levels

An example level:

difficulty 1
description "There is a file in your folder called README, you should add it to your staging area"

setup do
  repo.init
  FileUtils.touch("README")
end

solution do
  solved = true

  solved = false unless repo.status.files.keys.include?("README")
  solved = false if repo.status.files["README"].untracked

  solved
end

hint do
  puts "You can type `git` in your shell to get a list of available git commands"
end

difficulty, description and solution are required.

You can also include multiple hints like this:

hints [
  "You can type `git` in your shell to get a list of available git commands",
  "Check the man for `git add`"]

note Because solution is a Proc, you cannot prematurely return out of it and as a result, must put an explicit return on the last line of the solution block.

solution do
  solved = false
  solved = true if repo.valid?
  solved
end

By default, setup will remove all files from the game folder. You do not need to include a setup method if you don't want an initial git repository (if you are testing git init or only checking an answer.)

You can call repo.init to initialize an empty repository.

All methods called on repo are sent to the grit gem if the method does not exist, and you can use that for most git related commands (repo.add, repo.commit, etc.)

Another method exists called init_from_level and it is used like so:

setup do
  init_from_level
end

This will copy the contents of a repository specified in the levels folder for your level. For example, if your level is called "merge" then it will copy the contents of the "merge" folder. it is recommended that you do the following steps:

• mkdir "yourlevel"
• cd "yourlevel"
• git init
• some git stuff
• important rename ".git" to ".githug" so it does not get treated as a submodule
• cd "../"
• git add "yourlevel"

After doing this, your level should be able to copy the contents from that git repository and use those for your level. You can see the "blame" level for an example of this.

Testing Levels

The easiest way to test a level is:

• change into your git_hug repository
• Run githug reset PATH_TO_YOUR_LEVEL
• Solve the level
• Run githug test PATH_TO_YOUR_LEVEL

Please note that the githug test command can be run as githug test --errors to get an error stacktrace from your solve method.

It would be ideal if you add an integration test for your level. These tests live in spec/githug_spec and must be run in order. If you add a level but do not add a test, please add a simple skip_level test case similar to the contribute level.