[REQUEST]: More evaluation in REPL

[jvacek]

Is your feature request related to a problem? Please describe. When making queries, it's a bit hard to figure out what is accessible how. As each Metalanguage can do this differently, it would be nice to avoid trips to the docs.

Describe the solution you'd like It would be nice to be able to do some of the following commands in the REPL console:

:print $123.parent # print `$122 [ParentKind path_to_file.xyz:12:3-12:45]`
:print_ast $123.parent # print ast of parent

:print e.children.length # print "4"
:print e.children.length > 2 # print "True"

It could be also nice to have something for discoverability, which could show on the CLI what sort of attributes are accessible for querying.

:print_desc $123 
# Prints the value itself and then the results for:...
# - `kind`
# - `text`
# - `length`
# - `parent`, `children`, `next`/`previous_sibling`
# - Any other fields on the node

Describe alternatives you've considered N/A

Additional context Add any other context or screenshots about the feature request here.

[geoffreycopin]

Thanks for your request!

Release 0.3.4 is out today with the following improvements on the REPL:

• arbitrary top-level expressions are now supported (and not only queries), so the following expression would be supported: λ> $15.text.matches(`.*\/$`);
• :print and :print_ast commands are also more flexible and allow the inspection of node fields, so you can write something like: :print $15.parent.arguments or :print_ast $15.parent.arguments

An inspection command to list the fields available on a given node will be available shortly.