ADDED: user option specifying where to define new predicates

* sweeprolog.el (sweeprolog-default-new-predicate-location)
(sweeprolog-new-predicate-location-above-current): new functions.
(sweeprolog-new-predicate-location-function): new user option.
(sweeprolog-maybe-define-predicate): use it.

FIXED: possible error in sweeprolog-describe-predicate

Highlight test case head terms in a dedicated face

DOC: document sweeprolog-xref-project-source-files in the manual

ADDED: new command sweeprolog-xref-project-source-files

FIXED: find user predicate definitions more reliably

Catch error in kill-buffer-hook when top-level thread is dead

Bump version to 0.8.4

TEST: add test for updating syntax error faces

Recognize backslash as part of an operator in tokenization

FIXED: clear syntax error face after fix more aggressively

FIXED: properly update query highlighting in the toplevel

FIXED: simplify & make variable highlighting more reliable

FIXED: only consider backslash as an escape inside strings

FIXED: restrict variable underlining to current clause

FIXED: variable name completion on Emacs 27

* sweeprolog.el (sweeprolog-variable-completion-at-point): don't rely
on char-uppercase-p
* sweeprolog-tests.el (complete-variable): new test.

ADDED: sweeprolog-forward/backward/mark-predicate

REFACTOR: Simplify and deduplicate code all around

* sweeprolog.el (sweeprolog-colourise-*): rename to sweeprolog-analyze-*

FIXED: correctly recognize "public" head terms

TEST: add two test cases

FIXED: sweeprolog-identifier-at-point could return unbound module

Fixed defcustom type for sweeprolog-top-level-display-action

FIXED: write_sweep_module_location/0 for Windows.

Use term_string/2 to parse M:F/N terms encoded in strings

Organize and split sweeprolog.el into sections

Adhere to the convention of using "Emacs's" instead of "Emacs'"

DOC: added section "Code Completion" to the manual

ADDED: completion-at-point for variable names

* sweeprolog.el (sweeprolog-local-variables-collection,
sweeprolog-variable-completion-at-point): new
functions. (sweeprolog-mode): add to
completion-at-point-functions. (sweeprolog-mode-syntax-table): update
according to char_type(Char, prolog_symbol).

Update NEWS.org and bump package version

ADDED: context-based command for inserting new clauses or terms

* sweeprolog.el (sweeprolog--forward-hole, sweeprolog--backward-hole):
new functions.
(sweeprolog-forward-hole): new command.
(sweeprolog-end-of-predicate-definition,sweeprolog-insert-clause,
sweeprolog-maybe-insert-next-clause,
sweeprolog-maybe-define-predicate): new functions.
(sweeprolog-insert-term-functions): new hook.
(sweeprolog-insert-term-dwim): new command.
(sweeprolog-mode-map): bind new commands.
* sweeprolog-tests.el (dwim-define-predicate): new test case.
* README.org (Context-Based Term Insertion): new section.

ENHANCED: render refs to Prolog library in help buffers

* sweeprolog.el (sweeprolog-render-html-a): recognize and render
references to Prolog library files.

Handle operators that contain '.' more reliably

FIXED: handling of operators as predicate completion candidates

FIXED: don't include irrelevant candidates in apropos results

* sweep.pl (sweep_predicate_apropos/2): filter candidates by minimum
match quality.

ENHANCED: add predicate properties list in help buffers

* sweep.pl (sweep_predicate_properties/2): new predicate.
* sweeprolog.el (sweeprolog--render-predicate-properties): new
function.
(sweeprolog--describe-predicate): use it.

ENHANCED: load and initialize sweep-module just-in-time

Instead of loading sweep-module and initializing Prolog as part of
loading sweeprolog.el (subject to the user option
sweeprolog-init-on-load), this commit introduces just-in-time loading
and initialization of Prolog.  Suggested by Stefan Monnier.

* sweeprolog.el: (sweeprolog--open-query): new function, wraps
sweeprolog-open-query and initializes Prolog on the first call. Used
in place of sweeprolog-open-query throughout.
(sweeprolog-init-on-load): make variable obsolete.

ENHANCED: teach sweep to jump to C code for built-in predicates

* sweeprolog.el:
- sweeprolog-swipl-sources: new user option.
- sweeprolog-native-predicate-location: new function.
- sweeprolog-predicate-location: use it.
- README.org: Built-in Native Predicates: new section.

sweeprolog-describe-predicate compatibility with Emacs 27

ENHANCED: prompt for sweeprolog-describe-predicate

Following feedback from Jan Wielemaker

FIXED: additional compatibility issue with buttons

FIXED: sweeprolog-describe-predicate compatibility with Emacs 28

ADDED: new command for showing help for Prolog predicates

* sweep.pl: sweep_predicate_html_documentation/2: new predicate
* sweeprolog.el:
- sweeprolog-read-predicate-history: new variable.
- sweeprolog-read-predicate: use it, and default to the predicate at
point.
- sweeprolog--colour-term-to-faces: quote symbol
- sweeprolog-describe-predicate: new command.
- sweeprolog-help-prefix-map: bind it.
* README.org: Prolog Help: mention it.

Use list notation for format/2

Extracted locating libswipl and sweep-module to sweep_link.pl

ADDED: new command for showing help for Prolog modules

* sweep.pl: sweep_module_html_documentation/2: new predicate.
* sweeprolog.el:
- sweeprolog-read-module-history: new variable.
- sweeprolog-read-module-name: use it.
- sweeprolog--describe-module: new function.
- sweeprolog-describe-module: new command.
- sweeprolog-help-prefix-map: new keymap.
- sweeprolog-prefix-map: bind it keymap to `h'.
* README.org: Prolog Help: new section.

ENHANCED: update xref data for buffer after exporting predicate

FIXED: possible loop finding start of clause at start of buffer

ADDED: new command for exporting Prolog predicates

* sweep.pl: sweep_local_predicate_export_comment/2: new predicate.
* sweeprolog.el:
- sweeprolog-read-exportable-predicate-prompt: new user option.
- sweeprolog--exportable-predicates: new buffer local variable.
- sweeprolog--colour-term-to-faces: accumulate exportable predicates.
- sweeprolog-colourise-buffer: reset sweeprolog--exportable-predicates.
- sweeprolog-export-predicate: new command.
- sweeprolog-mode-map: bind it.
- sweeprolog-menu: bind it.
- README.org: document it.

DOC: mention new sweep Prolog flag in README.org and NEWS.org

FIXED: sweep_identifier_at_point/2: possible infinite failure loop

FIXED: disregard stderr when invoking write_sweep_module_location

ENHANCED: create Prolog flag sweep=true when running under sweep

Remove unused dependencies library(help) and library(prolog_server)

Load libswipl ahead of sweep-module if it's an ELF

DOC: index some keystrokes in the manual

PORT: Try to find emacs-module.h in the $MINGW_ROOT to build it along with
the Windows versions.

DOC: Update section "Things to do"

ENHANCED: use next-error-select-buffer when switching to a buffer

* sweeprolog.el: sweeprolog-mode: add hook to
window-selection-change-functions.

FIXED: sweeprolog-end-of-top-term would get confused by "=.."

* sweeprolog.el: sweeprolog-end-of-top-term: don't stop after "=..".
* sweeprolog-tests.el: add unit test.

ADDED: Flymake integration in sweeprolog-mode

* sweeprolog.el:
- sweeprolog-enable-flymake: new user option.
- sweeprolog--diagnostics: new buffer-local variable.
- sweeprolog--diagnostics-report-fn,
sweeprolog--diagnostics-changes-beg,
sweeprolog--diagnostics-changes-end: new buffer-local variables.
- sweeprolog-defface: add docstrings for generated functions.
- sweeprolog--colourise: accumulate diagnostics when
sweeprolog-enable-flymake is non-nil.
- sweeprolog-colourise-buffer, sweeprolog-colourise-some-terms: report
diagnostics when sweeprolog-enable-flymake is non-nil.
- sweeprolog-show-diagnostics: new command in sweeprolog-mode buffers.
- sweeprolog-mode-map: bind it.
- sweeprolog-diagnostic-function: new function.
- sweeprolog-mode: use it when sweeprolog-enable-flymake is non-nil.
* README.org: Examining diagnostics: new section.
* NEWS.org: announce flymake integration.

DOC: add descriptions to all manual sections

FIXED: quote file paths passed to shell-command-to-string

* sweeprolog.el: sweeprolog--ensure-module: quote paths and use
packaged sweep.pl
* README.org: fix typo

ADDED: new command and user option for updating whitespace

* sweeprolog.el:
- sweeprolog-align-spaces: new command, updates whitespace around
point according to SWI-Prolog conventions.
- sweeprolog-enable-cycle-spacing: new user option, when non-nil
sweeprolog-align-spaces is added to cycle-spacing-actions.
- sweeprolog-mode: use it.
- README.org: document it.
- NEWS.org: announce it.

FIXED: detecting end of clause with inline comments ending with "."

Use sweep.pl from the ELPA package rather than from SWI-Prolog

DOC: added short documentation for sweep as a SWI-Prolog package

PORT: don't use defvar-keymap, introduced only in Emacs 29

TEST: add unit test for nested Elisp->Prolog->Elisp call chains

ENHANCED: allow for Elisp->Prolog->Elisp->... call chains

DOC: add manual sections "Contributing" and "Things to do"

Announce recent changes in NEWS.org, bump version to 0.5.0

DOC: describe the Top-level Menu and signaling in the manual

* README.org:
- The Top-level Menu buffer: new section.
- Sending signals to running top-levels: new section.

ADDED: key and menu bindings for sweeprolog-list-top-levels

* sweeprolog.el:
- sweeprolog-prefix-map: bind sweeprolog-list-top-levels to T
- sweeprolog-menu: add menu entry for sweeprolog-list-top-levels

ADDED: new command for signaling a top-level from the Top-level Menu

* sweeprolog.el:
- sweeprolog-top-level-menu-signal: new command
- sweeprolog-top-level-menu-mode-map: bind it to s

ADDED: new command for signaling the current top-level

* sweeprolog.el:
- sweeprolog-top-level-signal-current: new command
- sweeprolog-top-level-mode-map: bind it to C-c C-c

FIXED: top-level buffer to thread synchronization

ADDED: new command for signaling Prolog top-level threads

* sweep.pl: sweep_thread_signal/2: new predicate.

* sweeprolog.el:
- sweeprolog-signal-thread: new function, Elisp interface for
sweep_thread_signal/2.
- sweeprolog-top-level-thread-id: new buffer-local variable in
sweeprolog-top-level buffers.
- sweeprolog-top-level-signal: new command.
- sweeprolog-top-level-mode: signal top-level thread with
thread_exit/1 when buffer is killed.

FIXED: reverse args modes in sweeprolog-document-predicate-at-point

ADDED: sweep Top-level Menu for listing Prolog top-levels

* sweep.pl
- sweep_top_level_threads/2: new predicate for querying
currently active Prolog top-level threads

* sweeprolog.el
- sweeprolog-top-level-menu--entries: new function, exposing
sweep_top_level_threads/2 to Elisp.
- sweeprolog-top-level-menu-mode: new major mode derived from
tabulated-list-mode
- sweeprolog-top-level-menu-go-to: new command, switches to the
top-level buffer of the Top-level Menu entry at point
- sweeprolog-top-level-menu-kill: new command, kills the top-level
buffer of the Top-level Menu entry at point
- sweeprolog-top-level-menu-new: new command, creates a new top-level
from the Top-level Menu
- sweeprolog-list-top-levels: new command, opens the Top-level Menu

NEWS.org: announce sweeprolog-document-predicate-at-point

README.org: fix typos

DOC: Add docstrings to some undocumented internal functions

DOC: new manual section "Documenting predicates"

ADDED: new command sweeprolog-document-predicate-at-point

ADDED: new function sweeprolog-definition-at-point

DOC: document new eldoc integration

ADDED: on-the-fly documentation for predicates with eldoc

ADDED: auto-insert integration for filling in Prolog module headers

* sweeprolog-module-header-comment-skeleton: new user option

FIXED: clear highlighting from whitespace after a fullstop

NEWS.org: remove version macro using internal package-desc-version

FIXED: error when indenting after prefix operator

DOC: say sweep-module instead of sweeprolog-module in the manual

DOC: add missing source block in Getting Started section

DOC: Added "Getting Started" manual section

ADDED: Menu for sweep commands

DOC: add a reference to the SWI-Prolog manual QQ section

ENHANCED: provide semantic highlighting for missing term kinds

DOC: document quasi-quotation highlighting in the manual

ENHANCED: fontify quasi-quotation content according to its type

* sweeprolog-qq-mode-alist: new user option
* (sweeprolog--colour-term-to-faces): use it

FIXED: error on interactively removing variable highlighting