Cataclysm: Dark Days Ahead is a roguelike set in a post-apocalyptic world. While some have described it as a "zombie game", there's far more to Cataclysm than that. Struggle to survive in a harsh, persistant, procedurally generated world. Scavenge the remnants of a dead civilization for for food, equipment, or, if you're lucky, a vehicle with a full tank of gas to get you the hell out of Dodge. Fight to defeat or escape from a wide variety of powerful monstrosities, from zombies to giant insects to killer robots and things far stranger and deadlier, and against the others like yourself, that want what you have...

The current instructions on how to compile C:DDA can be found here.

Contributing to C:DDA is easy - simply fork the repository here on GitHub, make your changes, and then send us a pull request - but there are a couple of guidelines we suggest sticking to:

• Add this repository as an upstream remote.
• Keep your master branch clean. This means you can easily pull changes made to this repository into yours.
• Create a new branch for each new feature or set of related bug fixes.
• Never merge from your local branches into your master branch. Only update that by pulling from upstream/master.

(This only needs to be done once.)

1. Fork this repository here on GitHub.

2. Clone your fork locally.

    $ git clone https://github.com/YOUR_USERNAME/Cataclysm-DDA.git
    # Clones your fork of the repository into the current directory in terminal
   

3. Add this repository as a remote.

    $ cd Cataclysm-DDA
    # Changes the active directory in the prompt to the newly cloned "Cataclysm-DDA" directory
    $ git remote add -f upstream https://github.com/TheDarklingWolf/Cataclysm-DDA.git
    # Assigns the original repository to a remote called "upstream"
   

1. Make sure you have your master branch checked out.

    $ git checkout master
   

2. Pull the changes from the upstream/master branch.

    $ git pull --ff-only upstream master
    # gets changes from the "upstream" remote for the matching branch, in this case "master"
   

• Note: If this gives you an error, it means you have committed directly to your local master branch. Click here for instructions on how to fix this issue.

0. Update your master branch, if you haven't already.

1. For each new feature or bug fix, create a new branch.

    $ git branch new_feature
    # Creates a new branch called "new_feature"
    $ git checkout new_feature
    # Makes "new_feature" the active branch
   

2. Once you've committed some changes locally, you need to push them to your fork here on GitHub.

    $ git push origin new_feature
    # origin was automatically set to point to your fork when you cloned it
   

3. Once you're finished working on your branch, and have committed and pushed all your changes, submit a pull request from your new_feature branch to this repository's master branch.

• Note: any new commits to the new_feature branch on GitHub will automatically be included in the pull request, so make sure to only commit related changes to the same branch.

These guidelines aren't essential, but they can make keeping things in order much easier.

Remote tracking branches allow you to easily stay in touch with this repository's master branch, as they automatically know which remote branch to get changes from.

$ git branch -vv
* master      xxxx [origin/master] ....
  new_feature xxxx ....

Here you can see we have two branches; master which is tracking origin/master, and new_feature which isn't tracking any branch. In practice, what this means is that git won't know where to get changes from.

$ git checkout new_feature
Switched to branch 'new_feature'
$ git pull
There is no tracking information for the current branch.
Please specify which branch you want to merge with.

In order to easily pull changes from upstream/master into the new_feature branch, we can tell git which branch it should track. (You can even do this for your local master branch.)

$ git branch -u upstream/master new_feature
Branch new_feature set up to track remote branch master from upstream.
$ git pull
Updating xxxx..xxxx
....

You can also set the tracking information at the same time as creating the branch.

$ git branch new_feature_2 --track upstream/master
Branch new_feature_2 set up to track remote branch master from upstream.

• Note: Although this makes it easier to pull from upstream/master, it doesn't change anything with regards to pushing. git push fails because you don't have permission to push to upstream/master.

   $ git push
   error: The requested URL returned error: 403 while accessing https://github.com/TheDarklingWolf/Cataclysm-DDA.git
   fatal: HTTP request failed
   $ git push origin
   ....
   To https://github.com/YOUR_USERNAME/Cataclysm-DDA.git
   xxxx..xxxx  new_feature -> new_feature
  

####Why does git pull --ff-only result in an error?

If git pull --ff-only shows an error, it means that you've committed directly to your local master branch. To fix this, we create a new branch with these commits, find the point at which we diverged from upstream/master, and then reset master to that point.

$ git pull --ff-only upstream master
From https://github.com/TheDarklingWolf/Cataclysm-DDA
 * branch            master     -> FETCH_HEAD
fatal: Not possible to fast-forward, aborting.
$ git branch new_branch master          # mark the current commit with a tmp branch
$ git merge-base master upstream/master
cc31d0... # the last commit before we committed directly to master
$ git reset --hard cc31d0....
HEAD is now at cc31d0... ...

Now that master has been cleaned up, we can easily pull from upstream/master, and then continue working on new_branch.

$ git pull --ff-only upstream master
# gets changes from the "upstream" remote for the matching branch, in this case "master"
$ git checkout new_branch