git-auto-commit-mode is a minor mode for GNU Emacs that, when enabled, tries to commit changes to a file after every save. It can also try to push to the default upstream.

Some projects / files don't need a very fancy commit log or anything and are typically only modified in small ways. Configuration files are a good example, where most changes are just single lines added, removed or changed. In these projects it can save some effort to just automatically commit them after every change.

Anyone who makes a lot of small, separate, changes to a bunch if git-tracked files and is tired of always having to go through the git add; git commit -m description process.

For further instructinos I would refer you to the README and http://ryulash.org/projects/git-auto-commit-mode/manual/.