Git, all of itClone, stage by the hunk, commit, push with lease, fetch, merge, rebase, cherry-pick, and resolve conflicts, on the device.
A real editorCodeMirror 6 with multi-cursor, project-wide search, formatting and linting, and a customizable keyboard bar.
Any folderEdit the app's own files, folders from iCloud Drive and other apps, or a folder on a server over SSH.