An implementation of Git in Objective-C & Foundation framework for embedding in Mac OS X and potentially iPhone OS Applications.

The currently supported features of the project are

• Reading objects, both loose and packed
• Resolving refs from .git/refs
• Reading branches, both local and remote
• Enumeration of commits in breadth and depth first orders
• Rev-list Support to a certain degree, full compatibility with git rev-list is not yet available
• Preliminary PACK File and Index generation support (API needs work, deltas currently unsupported)

Features which will be implemented at some point (in no particular order)

• Pulling changes from a remote repository via either ssh:// or git://
• Pushing changes to a remote repository via ssh://
• Mutable objects to enable writing new objects to the repository
• Manipulation of the Index/Stage
• ... and much much more*

Additionally features from CocoaGit which are not yet supported will be evaluated and migrated into this project.

*maybe, as and when things are thought of, suggested, or otherwise materialize, terms and conditions may apply, see binary for details

The first step to this is compiling a Release build of Git.framework, this can either be done in Xcode or via rake on the command line as

$ rake build:release

the built product will be in the builds/Release/ directory.

• In the Finder, copy Git.framework to your project directory (eg MyProject/Frameworks)
• Add the Frameworks/Git.framework to your Linked Frameworks group in Xcode
• Open Get Info on your Application Target, select the Build tab
• Change the Configuration to All Configurations
• Enter Runpath Search Paths into the Filter field
• Add @executable_path/../Frameworks to the Runpath Search Paths
• Add a New Copy Files Build Phase to your Application Target
• Select Frameworks from the Destination dropdown
• Drag Git.framework from Linked Frameworks to your new Copy Files build phase

You might want to rename the Copy Files build phase to Copy Frameworks

Some issues have been reported when building the framework in Xcode and the Info.plist Version script failing to find git. The source of this issue stems from how Xcode is started. If Xcode is started from a Terminal session via open Git.xcodeproj or similar then Xcode will inherit the PATH of the Terminal session. In the majority of cases this is results in no issues.

When Xcode is started from Finder then it inherits the PATH from the environment, which unfortunately is not the same as the PATH used by shells in Terminal. To change the environment PATH requires creating or modifying ~/.MacOSX/environment.plist with the Property List Editor and adding/editing the PATH key in the plist.

As an example my ~/.MacOSX/environment.plist looks like this when passed to cat

{
  PATH = "/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/Users/geoffgarside/bin";
}

After creating or modifying this file you will unfortunately have to login/logout for it to be picked up.

Thanks to Brian Chapados who did the detective work on finding this information out.

The test suite requires MacRuby 0.5 and Bacon and can be run either through Xcode or rake in the Terminal. So far tests have been run using MacRuby r3090 and Bacon v0.9.

Bacon can be installed either using Rubygems or alternatively with rip

I've tried to keep the code formatting and style unified within the project and with the current body of code this should be reasonably easy to follow. To aid in keeping the tabs/spaces under control there is a pre-commit hook which can be installed via

$ rake check_tabs:install_hook

if you don't have a pre-commit hook already then this one will be installed, if you do then the script contents will be printed and you will need to merge them manually. This will cause a commit were there are tabs in the files being committed to fail. If you want to check the staged files or Source/ contents for tabs you can use either of the following

$ rake check_tabs:source
$ rake check_tabs:staged

and any offending lines will be printed.

The hook can be configured to ignore specific file MIME types and extensions, this is done as follows

$ git config pre-commit.ignored.mime 'image/ application/xml application/octet-stream'
$ git config pre-commit.ignored.extensions 'graffle pbxproj'

The addition of any C level constants which need to be exposed to a bridged language such as MacRuby or PyObjC will require the regeneration of the BridgeSupport files. The headers containing the constants or functions to be exposed will need to be marked as public in the Git target and then the bridgesupport:generate rake task will need to be run.

All headers need to be documented using the style currently in use. Documentation is generated using the Doyxgen tool and is then post-processed by the Documentation/doxyclean project into the final format.

Released under the terms of the MIT licence, details of which are below

Copyright (c) 2009 Geoff Garside

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.