如何确定谁最后用JGit更改了文件

Question

There is a good cook-book receipt for JGit which describes how to blame the author of a specific line in a file.

Now I want to know who last changed a file. Iterating over all lines to find the last changed line looks a little bit not so elegant. Ideas?

Answer 1

You can use the LogCommand with a path filter like this:

Iterable<RevCommit> iterable = git.log().addPath( "foo.txt" ).call();
RevCommit latestCommit = iterable.iterator().next();

The code looks for the latestCommit that modified foo.txt . I haven't tested the above snippet with merge commits or other commits that have more than one parent.

Note however that this solution potentially may leak resources: the RevWalk which provides the iterator is created by the LogCommand but never closed.

In order to avoid the resource leak you can manually iterate the history like so:

RevCommit latestCommit = null;
String path = "file.txt";
try( RevWalk revWalk = new RevWalk( git.getRepository() ) ) {
  Ref headRef = git.getRepository().exactRef( Constants.HEAD );
  RevCommit headCommit = revWalk.parseCommit( headRef.getObjectId() );
  revWalk.markStart( headCommit );
  revWalk.sort( RevSort.COMMIT_TIME_DESC );
  revWalk.setTreeFilter( AndTreeFilter.create( PathFilter.create( path ), TreeFilter.ANY_DIFF ) );
  latestCommit = revWalk.next();
}