SWI-Prolog -- prolog_list

Documentation
- Reference manual
  - Hackers corner
    - Hooks for integrating libraries
- Packages

prolog_list_goal(:Goal)

Hook, normally not defined. This hook is called by the’L' command of the tracer in the module user to list the currently called predicate. This hook may be defined to list only relevant clauses of the indicated Goal and/or show the actual source code in an editor. See also portray/1 and multifile/1.