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XPCE/SWI-Prolog --- PceEmacs

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PceEmacs showing a coloured Prolog file, the summary description of the current goal and a just-set break-point. Breakpoints are set at a specific call in a specific clause (opposite to traditional spy-points that trap the tracer on any call to a specified predicate). As execution reaches the break-point, the source-level debugger is activated.

PceEmacs is started using ?- emacs. or ?- emacs(File). It can be made the default editor for edit/[0,1] by setting the Prolog flag editor. For example by adding the following to .plrc (pl.ini on MS-Windows):

:- set_prolog_flag(editor, pce_emacs).

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