starting some work on my jgit ideas

pom.xml

@@ -12,6 +12,10 @@
 			<id>andy-maven</id>
 			<url>https://github.com/apmeneel/andy-maven/raw/master/releases</url>
 		</repository>
+		<repository>
+			<id>jgit-repository</id>
+			<url>http://download.eclipse.org/jgit/maven</url>
+		</repository>
 	</repositories>
 	<dependencies>
 		<dependency>
@@ -62,5 +66,10 @@
 			<version>3.6</version>
 			<type>jar</type>
 		</dependency>
+		<dependency>
+			<groupId>org.eclipse.jgit</groupId>
+			<artifactId>org.eclipse.jgit</artifactId>
+			<version>1.3.0.201202151440-r</version>
+		</dependency>
 	</dependencies>
 </project>

src/main/java/org/chaoticbits/devactivity/churn/git/CodeChurn.java

@@ -0,0 +1,54 @@
+package org.chaoticbits.devactivity.churn.git;
+
+import java.io.IOException;
+
+import org.eclipse.jgit.api.DiffCommand;
+import org.eclipse.jgit.api.Git;
+import org.eclipse.jgit.api.errors.GitAPIException;
+import org.eclipse.jgit.api.errors.JGitInternalException;
+import org.eclipse.jgit.api.errors.NoHeadException;
+import org.eclipse.jgit.blame.BlameResult;
+import org.eclipse.jgit.lib.Repository;
+import org.eclipse.jgit.revwalk.RevCommit;
+import org.eclipse.jgit.treewalk.AbstractTreeIterator;
+import org.eclipse.jgit.treewalk.CanonicalTreeParser;
+
+public class CodeChurn {
+
+	private final Repository repo;
+
+	public CodeChurn(Repository gitRepo) {
+		this.repo = gitRepo;
+	}
+
+	public int compute(String path) {
+		Git git = new Git(repo);
+		BlameResult call = git.blame().setFilePath(path).setFollowFileRenames(true).call();
+
+		try {
+			Iterable<RevCommit> commits = git.log().addPath(path).call();
+
+			for (RevCommit revCommit : commits) {
+				String fullMessage = revCommit.getFullMessage();
+				DiffCommand diff = git.diff();
+				AbstractTreeIterator newTree = new CanonicalTreeParser();
+
+				AbstractTreeIterator oldTree = new CanonicalTreeParser();
+				diff.setNewTree(newTree).setOldTree(oldTree).call();
+			}
+		} catch (NoHeadException e) {
+			e.printStackTrace();
+		} catch (JGitInternalException e) {
+			e.printStackTrace();
+		} catch (GitAPIException e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+		} catch (IOException e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+		}
+
+		throw new IllegalStateException("unimplemented!");
+	}
+
+}

src/test/java/org/chaoticbits/devactivity/churn/git/GitCodeChurnTest.java

@@ -0,0 +1,25 @@
+package org.chaoticbits.devactivity.churn.git;
+
+import static org.junit.Assert.*;
+
+import java.io.File;
+
+import org.chaoticbits.devactivity.churn.git.CodeChurn;
+import org.eclipse.jgit.lib.Repository;
+import org.eclipse.jgit.storage.file.FileRepository;
+import org.eclipse.jgit.storage.file.FileRepositoryBuilder;
+import org.junit.Test;
+
+public class GitCodeChurnTest {
+
+	public static final File repoDir = new File("testdata/testgitrepo/.git");
+
+	@Test
+	public void simpleCodeChurn() throws Exception {
+		Repository gitRepo = new FileRepositoryBuilder().setGitDir(repoDir)
+				.readEnvironment().findGitDir().build();
+		int churn = new CodeChurn(gitRepo)
+				.compute("mancala/player/GreedyPlayer.java");
+		assertEquals(4, churn);
+	}
+}