For other things like files changed in current branch I've just kludged together aliases: branch_files='git log --decorate --pretty=oneline --abbrev-commit --name-only --no-merges --first-parent main..HEAD | fpp'

(fpp extracts file paths from output)

If you use zsh it can also helpful to setup suffix aliases so just the filename is bound to an application. For instance `alias -s {rb,erb,rake,css,js}=vim`