Add YAML-MODE

README.org

@@ -1213,6 +1213,7 @@ let
       <<emacs-rustic-package>>
       <<emacs-protobuf-package>>
       <<emacs-typescript-package>>
+      <<emacs-yaml-mode-package>>
       <<emacs-plantuml-package>>
 
       # User interface packages.
@@ -2638,6 +2639,15 @@ epkgs.typescript-mode
 
 Typescript.el is a self-contained, lightweight and minimalist major-mode focused on providing basic font-lock/syntax-highlighting and indentation for Typescript syntax, without any external dependencies.
 
+*** YAML Mode
+
+#+NAME: emacs-yaml-mode-package
+#+BEGIN_SRC nix
+epkgs.yaml-mode
+#+END_SRC
+
+YAML Mode helps you edit =YAML= ~.yml~ and ~.yaml~ files. It features font locking for data forms and comments, and some electric keys to help with block literals.
+
 *** PlantUML
 
 #+NAME: emacs-plantuml-extras

modules/emacs.nix

@@ -59,6 +59,7 @@ let
       epkgs.rustic
       epkgs.protobuf-mode
       epkgs.typescript-mode
+      epkgs.yaml-mode
       epkgs.plantuml-mode
 
       # User interface packages.