This is a pre-commit hook feeding all files through xmllint. 'xmllint' command is assumed to exists in command path (please use alias if you don't want to have command in a path, or modify the hook).

format-xmllint overwrites malformed files with reformated file.

check-xmllint hook runs xmllint --format and fails if any modified file doesn't match xmllint --format output. We don't advise to use that option.

Create or add following to .pre-commit-config.yaml in repository you would like to check:

repos:
  - repo: https://github.com/lsst-ts/pre-commit-xmllint
    rev: v1.0.0
    hooks:
      - id: format-xmllint

and install the hook:

pre-commit install