Investigate Match Param Progress Callbacks about rust-onig HOT 2 OPEN

The code in question is here in onig_sys.

Add support for setting both of these callbacks on MatchParam.

from rust-onig.

This will require modelling of the OnigCalloutArgs and access to them. I'm not sure how much of this has been stableised yet. From some poking around:

• Add a callout module which contains:
  • The CalloutArgs wrapper around the raw onig callout args pointer.
  • A Callout trait which can model something that can recive callouts. This trait should be implemented for Fn<CalloutArgs>.
• Changes to the MatchParam to allow a Callout to be registered. This will probably require storing the closure in the MatchParam and passing some raw function through to 'unpack' the Callout from the MatchParam via user data.

from rust-onig.