Used in place of git checkout to easily save your working tree on git checkout. This comes in two working versions. A script and an alias.
There is also a third version, the post-checkout hook, which works up to a point. Can sometimes get conflicts like a normal checkout can (see future below).
SRC_BRANCH = branch before the command was run
DEST_BRANCH = branch you want to checkout
When fired, creates a tmp branch working/SRC_BRANCH, and commits all working tree changes, before checking out DEST_BRANCH.
If working/DEST_BRANCH exists, it merges those changes back into DEST_BRANCH and resets HEAD back 1 commit to reapply the changes to the working tree.
This is easily done with stash, but I find when jumping around from branch to branch it can get cluttered and I have to search to find the stash I want to reapply.
Ideally it could run using pre-checkout and post-checkout hooks, however there is no pre-checkout hook.
Overriding the default checkout command would also work, but allas you cannot alias default git commands.