Sweep Prolog mode highlights Prolog code through the standard Emacs
font-lock system (see (emacs)Font Lock). Sweep Prolog
mode highlights different tokens in Prolog code according to their
semantics, determined through static analysis that Sweep performs on
demand. When you first open a buffer in Sweep Prolog mode, its entire
contents are analyzed to collect and cache cross reference data, and
Sweep highlight all of the code in the buffer accordingly. In
contrast, while you edit and move around the buffer, Sweep uses a
faster, local analysis for updating the semantic highlighting in
response to changes in the buffer.
Analyze the current buffer and update cross-references
(sweeprolog-analyze-buffer).
Whether to analyze sweeprolog-mode buffers on idle. Defaults
to t.
Maximum number of characters in a Sweep Prolog mode buffer to analyze on idle. Larger buffers are not analyzed on idle. Defaults to 100,000 characters.
Minimum number of idle seconds to wait before analyzing a
sweeprolog-mode buffer. Defaults to 1.5.
At any point in a sweeprolog-mode buffer, you can use the
command C-c C-c (M-x sweeprolog-analyze-buffer) to update
the cross reference cache and highlight the buffer accordingly. When
Sweep’s Flymake integration is enabled, this command also updates the
diagnostics for the current buffer (see Examining Diagnostics). This may
be useful, for example, after defining a new predicate.
If the user option sweeprolog-analyze-buffer-on-idle is set to
non-nil (as it is by default), Sweep also updates semantic
highlighting in the buffer whenever Emacs is idle for a reasonable
amount of time, unless the buffer is larger than the value of the
sweeprolog-analyze-buffer-max-size user option. You can
specify a minimum idle time for Sweep to wait before updating
reanalyzing the buffer highlighting is controlled by customizing the
user option sweeprolog-analyze-buffer-min-interval.
To view and customize the various faces that Sweep defines and uses for semantic highlighting, type M-x customize-group RET sweeprolog-faces RET. See (emacs)Faces, for more information about text faces in Emacs.