# Summary

Adds a formatting pre-submit check that runs `make format` and checks
for file differences. The results of running `make format` are not
included in this PR for readability. So the pre-submit will depend on
#3655 and probably some more formatting before the check will pass.

Added a `make shfmt` formatting check for bash scripts.

`autogen` (for adding license headers) is now vendored in the
`third_party` directory for convenience sake.

`markdown-toc` and `autogen` are now run by `make format`. The
formatting pre-submit now runs these as well so they don't have separate
pre-submit jobs. We will need to adjust the required checks on branch
protection to remove "markdown-toc" and "autogen" jobs, and also add the
"formatting" job.

`CONTRIBUTING.md` was updated to include some more information about
coding style and conventions.

## Testing Process

1. Run `make format`
2. Verify the formatting results

## Checklist

- [x] Review the contributing
[guidelines](https://github.com/slsa-framework/slsa-github-generator/blob/main/CONTRIBUTING.md)
- [x] Add a reference to related issues in the PR description.
- [x] Update documentation if applicable.
- [x] Add unit tests if applicable.
- [x] Add changes to the
[CHANGELOG](https://github.com/slsa-framework/slsa-github-generator/blob/main/CHANGELOG.md)
if applicable.

---------

Signed-off-by: Ian Lewis <ianlewis@google.com>