Re: [jgit-dev] Implementing git-cat-file, git-ls-tree...

[Shawn Pearce <spearce@xxxxxxxxxxx>]

On Tue, Aug 17, 2010 at 8:46 AM, Ketan Padegaonkar
<ketanpadegaonkar@xxxxxxxxx> wrote:
> I'm in the process of implementing an open source jruby web based source
> browser for git across a product we build.
>
> In order to get this to work, I *think* what I need at the bare minimum is
> something like git-cat-file that can output contents of files/blobs, and
> git-ls-tree to view a snapshot of the directory listings.
>
> Are there any quick examples that I can look at to implement these features
> and contribute them back as patches ?

Well, we have ls-tree already implemented:

  org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/LsTree.java

And cat-file is reasonably simple:

  int type;
  if (argv[0].equals("blob"))
    type = Constants.OBJ_BLOB;
  ...

  ObjectId id = ObjectId.fromString(argv[1]);
  ObjectLoader ldr = db.open(id, type);
  byte[] tmp = new byte[1024];
  InputStream in = ldr.openInputStream();
  int n;
  while ((n = in.read(tmp)) > 0)
    System.out.write(tmp, 0, n);
  in.close();

-- 
Shawn.