# GitWrapper #

A set of classes for working with git repositories. The repository is examined using a wrapper around native git calls.
The current feature set is limited to extraction of merge commits and associated operations. 

### Setup ###

GitWrapper uses the Gradle build system.

Using `./gradlew build` will assemble a .jar file containing the library in the `build/libs` directory.
The dependencies of the library may be displayed using `./gradlew dependencies --configuration runtime`.

If the project using the library is also a gradle project, it is far more convenient to add the library as a sub-project. The code below assumes that the directory of your clone of GitWrapper is a sibling of the project directory using it. Extend your `settings.gradle` and `build.gradle` as follows:

**settings.gradle**
```
#!groovy
includeFlat 'GitWrapper' // The name of the folder containing your clone of GitWrapper.
```

**build.gradle**
```
#!groovy
dependencies {
    compile project(':GitWrapper')
}
```

### Example ###

The following example code will clone a given repository to the current working directory and display the SHA1 hashes of all merge commits.

```
#!Java
GitWrapper git;

try {
    git = new GitWrapper("git"); // Or /usr/bin/git, C:\Program Files\Git\bin\git.
} catch (ToolNotWorkingException ex) {
    // Handle the case that git can not be called using the supplied command.
    return;
}

Optional<Repository> optRepo = git.clone(new File("."), "git@github.com:se-passau/jdime.git", false);

optRepo.ifPresent(repo -> repo.getMergeCommits().forEach(mergeCommit -> {
    System.out.println("Merge Commit: " + mergeCommit.getId());
}));
```

### Contact ###
* Georg Seibt (seibt[at]fim.uni-passau.de)