SWI-Prolog -- Manual

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GNU Emacs Interface

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2.5 GNU Emacs Interface

Unfortunately the default Prolog mode of GNU Emacs is not very good. There are several alternatives though:

https://bruda.ca/emacs/prolog_mode_for_emacs
Prolog mode for Emacs and XEmacs maintained by Stefan Bruda.
https://www.metalevel.at/pceprolog/
Recommended configuration options for editing Prolog code with Emacs.
https://www.metalevel.at/ediprolog/
Interact with SWI-Prolog directly in Emacs buffers.
https://www.metalevel.at/etrace/
Trace Prolog code with Emacs.