SWI-Prolog -- prolog:open_source

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Predicate open_source_hook/3

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prolog:open_source_hook(+Path, -Stream, +Options)

This hooks is called by the compiler to overrule the default open/3 call open(Path, read, Stream). Options provide the options as provided to load_files/2. If the hook succeeds compilation continues by loading from the returned (input) stream. This hook is particularly suited to support running the code to a preprocessor. See also prolog_load_file/2.