YAML Schemas in Emacs with Eglot

Are you someone that enjoys Emacs and the amazing built-in package Eglot, which enables Emacs to provide intelligent completions and error reporting, linting, and more with language servers ?

Are you ocasionally editing YAML files and would like to use JSON Schemas for YAML, get some feedback from Emacs, the right completions for a configuration file ?

# Almost a type system for YAML 💚

Let me introduce yaml-language-server (easily installed from Nix too).

By the way if you want to see advanced Eglot configuration check the manual or my own dotfiles at: https://codeberg.org/jjba23/sss.

Say no more, configure Eglot directly like below. This will ensure you can load several schemas with semantic / domain meaning, but always have the yamllint schema as fallback.

# Configuring Eglot

(setq-default eglot-workspace-configuration
              '(:yaml ( :format (:enable t)
                        :validate t
                        :hover t
                        :completion t
                        :schemas (https://raw.githubusercontent.com/my-user/my-project/project.schema.yml ["project.yml"]
                                  https://json.schemastore.org/yamllint.json ["/*.yml"])
                        :schemaStore (:enable t))
                 ;; here other language server configurations
                ))

And have Eglot start yaml-language-server --stdio automatically.

See the language server’s documentation for more details on how to load YAML schemas from various sources, even declaratively in the YAML file itself.