Can I commit only parts of my code using SVN or Mercurial?

Question

I use Tortoise SVN usuallly, but I have been looking into Mercurial since it is a distributed revision control system.

What I am looking for, in both systems, is a tool

Answer 1

Yes, git allows you to do this. The git add command has a -p (or --patch) option that allows you to review your changes hunk-by-hunk, select which to stage (you can also refine the hunks or, edit the patches in place). You can also use the interactive mode to git-add (git add -i) and use the "p" option.

Here's a screencast on interactive adding which also demonstrates the patch feature of git add.