Announce recent changes in NEWS.org and bump version to 0.17.0

FIXED: beginning-of-clause detection with quoted head functors

* sweeprolog.el (sweeprolog-beginning-of-top-term): don't skip quoted
functors in clause heads.

ADDED: Support setting breakpoints in sweeprolog-mode

* sweep.pl (sweep_set_breakpoint/2)
(sweep_delete_breakpoint/2)
(sweep_set_breakpoint_condition/2): new predicates.

* sweeprolog.el (sweeprolog-dependency-directive): update
package-version field.
(sweeprolog-set-breakpoint)
(sweeprolog-set-breakpoint-condition)
(sweeprolog-delete-breakpoint)
(sweeprolog-list-breakpoints): new commands.
(sweeprolog-highlight-breakpoints): new user option.
(sweeprolog-mode-map): bind sweeprolog-set-breakpoint.

* README.org (Setting Breakpoints): new manual section.

ADDED: mode line indication for loaded buffers

* sweep.pl (sweep_source_file_load_time/2): new predicate.
(sweep_load_buffer/2): also update source modification time based.
* sweeprolog.el (sweeprolog-buffer-load-time)
(sweeprolog-buffer-loaded-since-last-modification-p): new functions.
(sweeprolog-load-buffer): use it.
(sweeprolog-mode): add mode line indication if buffer is loaded.

* (sweeprolog-context-menu-for-variable): fix docstring

MODIFIED: sweeprolog-update-dependencies choice of directives

* sweeprolog.el (sweeprolog-dependency-directive): New user option.
Determines which directive to use in...
(sweeprolog-update-dependencies): Fix edge cases in finding where to
insert new directives. Optionally infer directive to add based on
current buffer contents.

* README.org (Managing Dependencies): Update section.

Announce recent changes in NEWS.org and bump version to 0.16.0

* (sweeprolog-insert-term-dwim): add undo-inhibit-region property

* README.org (Discovering Sweep): new manual section

* sweeprolog.el: allow info-lookup to recognize Sweep commands

* README.org: add explicit indexing directive

FIXED: end-of-term detection after a fullstop turns to a dict dot

This fixes an issue with finding clause bounds after changing e.g.:

    foo(Bar, Baz) :- Baz = Bar.
                              ^ read as fullstop

to:

    foo(Bar, Baz) :- Baz = Bar.foo.
                              ^ read as dict dot

ADDED: new commands for managing numbered variables

* sweeprolog.el (sweeprolog-increment-numbered-variables)
(sweeprolog-decrement-numbered-variables): new commands.
(sweeprolog-mode-map): bind them to C-c C-+ and C-c C--.
(sweeprolog-context-menu-for-variable): allow calling these new
commands from context menus for numbered variables.
* sweeprolog-tests.el: add test for incrementing numbered variables.
* README.org (Numbered Variables): new manual section.

* (sweeprolog-rename-variable-allow-existing): refine custom type

ENHANCED: handle renaming variables to existing variable names

* sweeprolog.el (sweeprolog-rename-variable-allow-existing): new user
option, used by...
(sweeprolog-read-new-variable-try): new command, exists the minibuffer
if it contains a valid variable name.  It checks if the selected
variable name already exists.  Used by...
(sweeprolog-read-new-variable): new function, reads a Prolog variable
name in the minibuffer with a dedicated exit command.
(sweeprolog-rename-variable): use it.

Announce recent changes in NEWS.org and bump version to 0.15.0

Avoid moving cursor while renaming variables from context menu

* sweeprolog.el (sweeprolog-analyze-term-at-point): new optional
argument POINT.
(sweeprolog-rename-variable): use it instead of moving point during
prompting to avoid the cursor being displayed at the click position
when called from the context menu.

* (xref-backend-references): report progress while formatting refs

ENHANCED: provide exact buffer positions for cross references

* sweep.pl (reference_span/5): new predicate.
(sweep_predicate_references/2): use it to find exact character offset of
predicate references.
* sweeprolog.el (xref-backend-references): adapt accordingly.

* (sweeprolog-rename-variable): report results if interactive

ADDED: command for renaming a variable in Prolog term

* sweeprolog.el (sweeprolog-rename-variable): new command.
(sweeprolog-context-menu-rename-variable): new command used in context
menus for variables.
(sweeprolog-context-menu-for-variable): new function, used in...
(sweeprolog-context-menu-functions): add it to the list.
(sweeprolog-mode-map): bind it to C-c C-r.
* README.org (Renaming Variables): new section.

Announce recent changes in NEWS.org and bump version to 0.14.1

ENHANCED: use docs from the SWI-Prolog manual to guess hole names

* sweep.pl (predicate_argument_names/2): also consult the SWI-Prolog
manual via pldoc_man:load_man_object/4 to find argument names for
built-in predicates.

ADDED: numeric argument for sweeprolog-forward/backward-hole

* sweeprolog.el (sweeprolog-count-holes): new command, counts holes
in the current buffer.
(sweeprolog-forward-hole, sweeprolog-backward-hole): new numeric
argument, corresponding to the prefix argument when called
interactively.  With positive/negative numeric argument, move over
that many holes.  With zero numeric argument, call
sweeprolog-count-holes instead.

DOC: improve documentation for holes

* README.org (Holes): Fix wording and index directives

yank holes back as plain variables

* sweeprolog.el (sweeprolog-mode): add sweeprolog-hole to
yank-excluded-properties buffer-locally.
* sweeprolog-tests.el: test it.
* README.org (Holes): mention it.

Add sweeprolog-view-news command and bump version to 0.14.0

* sweeprolog.el (sweeprolog-view-news): new command for viewing the
Sweep News file.

Document sweeprolog-file-at-point, file-name-at-point-functions

* (sweeprolog-xref-project-source-files): add progress reporting

don't use file-name-split for compatibility with older Emacsen

* sweeprolog.el: capitalize "Sweep" in major mode names

ADDED: command to pipe output of Prolog goals to Emacs buffers

* sweep.c (sweep_open_channel(), sweep_fd_open()): new helper
functions for obtaining Prolog streams from Emacs pipe buffers.
* sweep.pl (sweep_async_goal/2, sweep_interrupt_async_goal/2): new
predicates.
* sweeprolog.el (sweeprolog-async-goal): new command, executes a goal
in a separate thread and redirects its output to a buffer with mode..
(sweeprolog-async-goal-output-mode): new major mode, derived from
Compilation mode.
(sweeprolog-mode-map, sweeprolog-prefix-map, sweeprolog-menu): bind
sweeprolog-async-goal.
* README.org (Executing Prolog Asynchronously): new manual section.

FIXED: possible race condition when signaling new top-level threads

Announce recent changes in NEWS.org and bump version to 0.13.0

ENHANCED: consult with library index for finding predicate defs

* sweep.pl (sweep_predicate_location_/4): also check library_index/3.
* sweeprolog-tests.el: add test for finding the source location of a
predicate in the package clib.

expose new arithmetic functions support in library(prolog_colour)

FIXED: stale xref data when jumping across files with M-.

ADDED: right-click context menus in sweeprolog-mode

* sweeprolog.el (sweeprolog-context-menu-find-module)
(sweeprolog-context-menu-find-module-other-window)
(sweeprolog-context-menu-describe-module)
(sweeprolog-context-menu-find-file)
(sweeprolog-context-menu-find-file-other-window)
(sweeprolog-context-menu-describe-predicate): new commands, add to context menus by...
(sweeprolog-context-menu-for-predicate)
(sweeprolog-context-menu-for-module)
(sweeprolog-context-menu-for-file): new functions, used in...
(sweeprolog-context-menu-functions): new abnormal hook, used by...
(sweeprolog-context-menu-function): new function.
(sweeprolog-mode): add it to context-menu-functions.

* README.org (Context Menu): new section.

Announce recent changes in NEWS.org and bump version to 0.12.0

ADDED: short description for tokens on mouse hover (help-echo)

* sweep.pl (sweep_predicate_dependencies/2): new predicate.
* sweeprolog.el (sweeprolog-enable-help-echo): new user-option, when
non-nil sweeprolog-analyze-region-start-hook and
sweeprolog-analyze-region-fragment-hook are extended with...
(sweeprolog-analyze-start-help-echo)
(sweeprolog-analyze-fragment-help-echo): new functions, manage the
help-echo text property for Prolog text.
* README.org ("Hover for Help"): new section about help-echo.

ENHANCED: improve semantic highlighting for several constructs

* sweep.pl (sweep_color_normalized_/4): fix handling of non-callable
terms, propagate type error expected type to Elisp.
(sweeprolog_goal_kind_normalized/2): rename to...
(sweep_goal_kind_normalized/2): normalize all goal and head classes.
* sweeprolog.el (sweeprolog-analyze-fragment-to-faces): adapt to new
info from sweep_goal_kind_normalized/2, and highlight some missing
token kinds.

Announce recent changes in NEWS.org and bump version to 0.11.3

* README.org ("Initialization and Cleanup"): improve listings

* README.org: use ~code~ over =verbatim= more consistently

* README.org ("High-level Architecture"): fix out-of-date docs

* README.org ("Initialization and Cleanup"): use title case

* README.org ("Querying Prolog"): improve function listing

* (sweeprolog-prefix-map): bind sweeprolog-top-level-send-goal to q

DOC: improve listings in the "Editing Prolog Code" section

Bind C-c S-TAB to sweeprolog-backward-hole for symmetry

Add a couple of missing docstrings

* sweeprolog.el
(sweeprolog-read-predicate-documentation-with-holes)
(sweeprolog-read-predicate-documentation-default-function): add
docstrings.

* sweeprolog.el: fix some typos in docstrings

Refer to Sweep as a whole as "Sweep" without verbatim format

ADDED: command for sending a goal to top-level from any buffer

* sweeprolog.el (sweeprolog-top-level): extract buffer setup logic to...
(sweeprolog-top-level-buffer): new function.
(sweeprolog-top-level-send-string): new function, used by...
(sweeprolog-top-level-send-goal): new command, reads a goal from the
minibuffer and sends it to a Prolog top-level buffer.
(sweeprolog-mode-map): bind it to C-c C-q.
(sweeprolog-menu): add "Send Goal to Top-level" entry.
* README.org ("Sending Goals to the Top-level"): new manual section.

Support completion when reading a goal from the minibuffer

* sweeprolog.el (sweeprolog-read-goal-map): new keymap, derived from
sweeprolog-read-term-map.
(sweeprolog-goals-at-point): new function, similar to
sweeprolog-terms-at-point but only returns goal terms.
(sweeprolog-read-goal): use them.

DOC: explain how to follow source locations in top-level messages

MODIFIED: do not force set next-error buffer to Prolog buffer

Announce recent changes in NEWS.org and bump version 0.11.1

ENHANCED: use terms at point as "future history" for term-search

* sweep.pl (sweep_terms_at_point/2): new predicate.
* sweeprolog.el (sweeprolog-terms-at-point): new function.
(sweeprolog-read-term): use it for setting the future history.
(sweeprolog-read-goal): new function.
(sweeprolog-term-search): use it for reading a goal when called with
prefix argument.

Announce recent changes in NEWS.org and bump version to 0.11.1

ENHANCED: Support refining term searches with arbitrary goals

* sweep.pl (sweep_term_search/2): extend with an extra goal argument.
* sweeprolog.el (sweeprolog-read-term): new function, similar to
read--expression but for Prolog terms rather than Elisp expressions.
(sweeprolog-term-search): use it, and prompt for goal with prefix arg.

Announce recent changes in NEWS.org and bump version to 0.11.0

ENHANCED: restore original point when a term search is quit

* sweep.pl (list_tail/2): Fix possible non-termination

ADDED: command for finding terms subsumed by a given term

* sweep.pl (sweep_term_search/2): new predicate.
* sweeprolog.el (sweeprolog-term-search-in-buffer): new function.
(sweeprolog-term-search): new command.
* README.org ("Term Search"): new manual section.

FIXED: find next predicate definition more reliably

* sweep.pl (sweeprolog_beginning_of_last_predicate/2)
(sweeprolog_beginning_of_last_predicate/2): explicitly sort results,
don't assume xref_defined/3 yields ordered results.

Announce recent changes in NEWS.org and bump version to 0.10.1

Update copyright year

ADDED: user option to control predicate documentation composition

* sweeprolog.el
(sweeprolog-insert-pldoc-for-predicate): remove in favor of...
(sweeprolog-insert-predicate-documentation): new function.
 (sweeprolog-format-term-with-holes): new utility
function, used by...
(sweeprolog-read-predicate-documentation-with-holes)
(sweeprolog-read-predicate-documentation-default-function): new
functions, used for...
(sweeprolog-read-predicate-documentation-function): new user option,
used by...
(sweeprolog-read-predicate-documentation): new function, used by...
(sweeprolog-document-predicate-at-point): refactor.

Avoid excessive analysis in presence of unbalanced quotes

* sweeprolog.el (sweeprolog-analyze-fragment-fullstop): new function,
adds a dedicated text property to fullstops.
(sweeprolog-analyze-region-fragment-hook): add it.
(sweeprolog-at-fullstop-p)
(sweeprolog-end-of-last-fullstop, sweeprolog-end-of-next-fullstop):
new functions.
(sweeprolog-end-of-top-term): use them for restricting to region
between last fullstop and next fullstop.

Fix some typos in the manual section about holes

Announce recent changes in NEWS.org and bump version to 0.10.0

ADDED: New command sweeprolog-insert-term-with-holes

* sweep.pl (sweep_format_term/2, sweep_current_functors/2): new
predicates.
* sweeprolog.el (sweeprolog-read-functor-history): new variable,
history list for...
(sweeprolog-read-functor): new function.
(sweeprolog-forward-hole-repeat-mode): rename to...
(sweeprolog-forward-hole-repeat-map): corrected name for keymap.
(sweeprolog-analyze-end-font-lock): don't rely on
sweeprolog--next-hole to move point.
(sweeprolog-at-hole-p, sweeprolog-beginning-of-hole)
(sweeprolog-end-of-hole): new functions, used by...
(sweeprolog--previous-hole, sweeprolog--next-hole): revise.
(sweeprolog--precedence-at-point): new function, used by...
(sweeprolog-insert-term-with-holes): new command.
(sweeprolog-mode-map): bind it to C-c C-m
* sweeprolog-tests: test it.
* README.org ("Filling Holes"): move to top and rename to...
("Holes"): document sweeprolog-insert-term-with-holes.

ENHANCED: use variable names from docs when inserting next clause

* sweep.pl (sweep_format_head/2): new predicate.
* sweeprolog.el (sweeprolog-insert-clause): use it.

Improve sweeprolog-menu entry names

* sweeprolog.el (sweeprolog-info-manual): new function.
(sweeprolog-menu): add it, improve entry names.

ENHANCED: highlight holes in incomplete terms

* sweeprolog.el (sweeprolog-predicate-completion-at-point): fontify
holes when inserting them.
(sweeprolog-analyze-start-font-lock): reset font-lock-face in analyzed
region.
(sweeprolog-analyze-fragment-to-faces): fix syntax error handling,
don't highlight holes as it is done by...
(sweeprolog-analyze-end-font-lock): new function, highlights holes in
analyzed region when sweeprolog-highlight-holes is non-nil.
(sweeprolog-analyze-region-end-hook): add it.
(sweeprolog--hole): fix text property used for setting stickiness.

FIXED: possible crash after calling sweeprolog-restart

* (sweeprolog-menu): add entry for sweeprolog-infer-indent-style

Duplicate LaTeX label.

Announce recent changes in NEW.org and bump version to 0.9.6

* README.org: refine a couple of ALT_TITLEs

Add short titles to all manual nodes to act as menu items

ADDED: new command sweeprolog-infer-indent-style

* sweeprolog.el (sweeprolog-infer-indent-style): new command.
* sweeprolog-tests.el: test it.
* README.org ("Indentation"): mention it.

Use indent-to instead manually indenting with spaces

* sweeprolog.el (sweeprolog-indent-line): use indent-to.
(sweeprolog-indent-offset): tweak docstring.
(sweeprolog-indent-line-after-prefix): use it instead of hard-coded
offset.
(sweeprolog-export-predicate): don't override indent-tabs-mode.

* (sweeprolog-indent-or-forward-hole): simplify

Announce recent changes in NEW.org and bump version to 0.9.5

* (sweeprolog-mode): enable comment-multi-line

* (sweeprolog-mode): Improve interaction with auto-fill-mode

* (sweeprolog-beginning-of-predicate-at-point): fix hang near bob

* (sweeprolog-align-spaces): extend to also work in comments

FIXED: stale predicate locations in loaded modified buffers

* sweep.pl (sweep_predicate_location_/2,3): prefer xref over loaded
predicate properties.
* sweeprolog.el (sweeprolog-predicate-location): first analyze buffer
if modified to update xref data.

Announce recent changes in NEWS.org and bump version to 0.9.4

Use built-in file_autoload_directives/3 to update deps

* sweep.pl (sweep_file_missing_dependencies/2): new predicate.
* sweeprolog.el (sweeprolog-update-dependencies): use it.
* sweeprolog-tests.el: add another test case for
sweeprolog-update-dependencies.

* README.org ("Filling Holes"): improve indexing

* (sweeprolog--ensure-module): detect and report missing sweep.pl

ADDED: ability to pass command line args directly to swipl

* sweeprolog.el (sweeprolog-handle-command-line-args): new function,
sets up command line argument handling using...
(sweeprolog-command-line-function): new function.

ADDED: minor mode for moving to the next hole with TAB

* sweeprolog.el (sweeprolog-forward-hole-on-tab-mode): new minor mode,
binding TAB to...
(sweeprolog-indent-or-forward-hole): new command.
* README.org ("Filling Holes"): rephrase and mention new minor mode.

ENHANCED: indentation after infix operators

* sweeprolog.el (sweeprolog-indent-line-after-infix): adhere to last line
indentation even if non-standard, handle DCG RHS contexts and SSU
guards.
* sweeprolog-tests.el: add more tests for indentation.

* (sweeprolog-identifier-at-point): reliably qualify local heads