Map YAML to YAML with a Ruby snippet.

gem install dorian-yaml-map

Also included in the aggregate gem:

gem install dorian

yaml-map [file ...] "ruby code"

Run yaml-map -h for generated option details and yaml-map -v for the installed version.

• Arrays map each element. Hashes map each [key, value] pair. The final YAML is printed.

printf -- '- 1\n- 2\n' | yaml-map "it += 1"