--inf-ruby-mode semantics

[dgutov]

Can we make it imply --nosingleline and --nomultiline, but not anything else?

In particular, we (the inf-ruby upstream) decided not to use it because it also disables continuation prompts. Currently inf-ruby uses --prompt default --noreadline instead.

But with newer features here that we can't use from Emacs, it would be helpful if --inf-ruby-mode was an option one could use to avoid version checks. In particular, if irb --inf-ruby-mode --prompt default was a valid usage in the new IRB.

[dgutov]

Anybody cares about Emacs support here?

[mkaschenko]

+1

[gcentauri]

i know its been 2 years since this opened, but i'd like to give it a +1.

maybe it has been addressed in newer versions of ruby, but at least with my local version of ruby 2.7.5, adding it to the command options causes irb to fail to return the next prompt until i type another newline. it seems like the --noreadline option is possibly causing an issue.

it does seem to work on Ruby 3 though, but for the Emacs integration it would be quite nice to depend on this flag as @dgutov suggests.

[gcentauri]

ah i see my particular issue was addressed here #127

fwiw, i'm interested in helping with further Emacs support if any effort goes this way