filter-repo is not merely a history rewriting tool, it also contains a library that can be used to write new history rewriting tools. This directory contains several examples showing the breadth of different things that could be done.
|insert-beginning||Add a new file (e.g. LICENSE/COPYING) to the beginning of history.|
|signed-off-by||Add a Signed-off-by tag to a range of commits|
|lint-history||Run some lint command on all non-binary files in history.|
|clean-ignore||Delete files from history which match current gitignore rules.|
|filter-lamely (or filter‑branch‑ish)||A nearly bug compatible re-implementation of filter-branch (the git testsuite passes using it instead of filter-branch), with some performance tricks to make it several times faster (though it's still glacially slow compared to filter-repo).|
|bfg-ish||A re-implementation of most of BFG Repo Cleaner, with new features and bug fixes.|
Please note that the point of these examples is not to provide new complete tools, but simply to demonstrate that extremely varied history rewriting tools can be created which automatically inherit lots of useful base functionality: rewriting hashes in commit messages, pruning commits that become empty, handling filenames with funny characters, non-standard encodings, handling of replace refs, etc. (Additional examples of using filter-repo as a library can also be found in the testsuite.) My sincerest hope is that these examples provide lots of useful functionality, but that each is missing at least one critical piece for your usecase. Go forth and extend and improve.
All the examples require a symlink to git-filter-repo in your PYTHONPATH named git_filter_repo.py in order to run; also, all have a --help flag to get a description of their usage and flags.