We have a lot of keyboard layouts and the current output format is virtually
useless at searching for a specific one to debug any issues with either the
layout list or the output from libxkbregistry.
Let's use YAML instead because that can easily be post-processed to extract the
specific layouts wanted, e.g. to get the list of all layouts:
xkbcli-list | yq -r ".layouts[].layout"
to get the list of all variants of the "us" layout:
xkbcli-list | yq -r '.layouts[] | select(.layout == "us") | .variant
and the number of option groups:
xkbcli-list | yq -r '.option_groups[] | length'
Note that the top-level nodes have been de-capitalized, so where it was "Models"
before it is now "models" and the "Options" node is now "option_groups".
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>