‘gitlab-ci-mode’ is a major mode for editing GitLab CI files. It provides syntax highlighting and completion for keywords and special variables. An interface to GitLab’s CI file linter is also provided via ‘gitlab-ci-lint’. For more information about GitLab CI, see URL ‘https://docs.gitlab.com/ce/ci/README.html’. For details about the file format, see URL ‘https://docs.gitlab.com/ce/ci/yaml/README.html’.