Indentation prompt for multiline edits

[RubixDev]

I am currently working on creating a REPL for my own language. For multiline editing I just use the matching bracket validator for now, but that puts the cursor to the very front of the next line:

>> fun greet(name) {
    printl('Hello, ' + name + '!')
}
>> 

Comparing this to other REPLs like node or bpython, I would want it to look like this:

>> fun greet(name) {
..     printl('Hello, ' + name + '!')
.. }
>> 

Auto-indentation is not needed, just the placeholder dots in front to align the next lines with the prompt.

I think this would fit best as a config setting like indent_text which is "" by default.

If there already is a way to achieve this, please let me know

[gwenn]

No, but there is this old PR.
Maybe you should give a try to reedline and its render_prompt_multiline_indicator.

[RubixDev]

Are there any plans on merging that PR? reedline seems a bit unfinished and less mature to me and I don't really want to switch the whole library for that one feature

[gwenn]

Not in its current state.