jacobparis/trackcn

This repository is a command line tool called trackcn that copies individual files or directories from GitHub repositories into your own project, then lets you pull in upstream changes later without losing edits you have made. A single command can pull something like a shared library of AI agent skills into your project, and running an update command afterward reapplies only what has changed upstream, similar to a git merge. The main idea is for things you intend to customize after installing them. If you install a design system file, a UI component, or an agent skill and then edit it to fit your project, running the pull command computes the difference between the version you copied and the latest upstream version, then applies that difference on top of your modified file. Where your edits and the upstream changes collide, trackcn inserts merge conflict markers, the same kind you would see in a normal git merge, and leaves resolving them to you or to an AI coding assistant, which the author notes tends to be very good at figuring out how to combine the two versions sensibly. Beyond simple files and folders, trackcn understands GitHub's registry.json format used by tools like shadcn, so it can browse and install curated components from any repository that provides one, including private repositories, which some other similar tools do not support. It can also pull in a single commit, a range of commits between two versions, or the changes from an open pull request, which makes it useful for applying someone else's bug fix or entire feature to your own codebase. Every file trackcn installs is recorded in a trackcn.json file, tracking its destination path, its original path in the upstream repository, and the exact commit it was copied from, so future pulls know exactly what to compare against. trackcn itself does not use any AI: it simply prepares the diffs and merge markers, then relies on the person or coding agent running it to make sense of the result.