# Git, in this order

- no `.git` → `git init`
- no `.spw/_workbench` in `.gitmodules` → `git submodule add`
- link just added → `checkout` the reviewed revision
- link recorded, folder empty → `git submodule update --init`
- `git diff --check` looks only

```bash
test -d .git || git init
git submodule add https://github.com/spwashi/spw-workbench .spw/_workbench
git -C .spw/_workbench checkout 3eaab637767222ffe248449da7262a251c4c608b
git submodule update --init -- .spw/_workbench
git diff --check
```