[nongnu] elpa/sweeprolog 3fc2f2a361 1/3: ADDED: in-buffer completions for Prolog flags

[ELPA Syncer]

branch: elpa/sweeprolog
commit 3fc2f2a361fa7fb182d60b9d3be74a38023e03b4
Author: Eshel Yaron <me@eshelyaron.com>
Commit: Eshel Yaron <me@eshelyaron.com>

    ADDED: in-buffer completions for Prolog flags
    
    * sweep.pl (sweep_context_callable_arg/4): Report "flag" context.
    (sweep_flags_collection/2): New predicate.
    * sweeprolog.el (sweeprolog--flag-completion-at-point): New function.
    (sweeprolog--atom-or-functor-completion-at-point): Use it.
    * sweeprolog-tests.el (cap-flag-name): New test.
    * sweep.texi (Code Completion): Update.
---
 sweep.pl            | 21 ++++++++++++++++++++-
 sweep.texi          | 14 +++++++++-----
 sweeprolog-tests.el | 11 +++++++++++
 sweeprolog.el       | 17 +++++++++++++++++
 4 files changed, 57 insertions(+), 6 deletions(-)

diff --git a/sweep.pl b/sweep.pl
index 70023e267f..21fb0f6449 100644
--- a/sweep.pl
+++ b/sweep.pl
@@ -107,7 +107,8 @@
             sweep_functions_collection/2,
             sweep_function_functors_collection/2,
             sweep_nohup/2,
-            sweep_short_documentation/2
+            sweep_short_documentation/2,
+            sweep_flags_collection/2
           ]).
 
 :- use_module(library(pldoc)).
@@ -1223,6 +1224,18 @@ sweep_functions_collection([Bef,Aft], Fs) :-
                ),
             Fs).
 
+sweep_flags_collection([Bef|Aft], Fs) :-
+    findall(F, sweep_current_flag(Bef, Aft, F), Fs).
+
+%!  sweep_current_flag(+Bef:string, +Aft:string, -Flag:string) is nondet.
+%
+%   True when Flag is a current Prolog flag that contains Bef and then Aft.
+
+sweep_current_flag(Bef, Aft, Flag) :-
+    current_prolog_flag(Flag0, _),
+    term_string(Flag0, Flag),
+    sweep_matching_atom(Bef, Aft, Flag).
+
 sweep_option_functors_collection([Bef,Aft,Pred0,Ari,Arg], Fs) :-
     atom_string(Pred, Pred0),
     current_predicate_options(Pred/Ari, Arg, Options),
@@ -1409,6 +1422,9 @@ sweep_context_callable_arg(F0, N, 0, ["options", F, N]) :-
 sweep_context_callable_arg(F0, 1, ["option", P, N], ["option", P, N, F]) :-
     !,
     atom_string(F0, F).
+sweep_context_callable_arg(F, N, 0, "flag") :-
+    flag_arg(F,N),
+    !.
 sweep_context_callable_arg(F, N, 0, "source") :-
     source_arg(F,N),
     !.
@@ -1445,6 +1461,9 @@ arith_arg((=\=), 2).
 arith_arg((=:=), 1).
 arith_arg((=:=), 2).
 
+flag_arg(set_prolog_flag    , 1).
+flag_arg(current_prolog_flag, 1).
+
 source_arg(load_files, 1).
 source_arg(use_module, 1).
 source_arg(consult, 1).
diff --git a/sweep.texi b/sweep.texi
index 712e684e92..c0c2705cd8 100644
--- a/sweep.texi
+++ b/sweep.texi
@@ -2112,11 +2112,11 @@ names that appear elsewhere in the current clause,
 completion candidates.
 @item Predicate completion
 If point is at a callable position, @code{completion-at-point}
-suggests matching predicate calls as completion candidates.  If the
-predicate you choose takes arguments, Sweep inserts holes in their
-places, and moves point to the first argument (@pxref{Holes}).
+suggests matching predicate calls.  If the predicate you choose takes
+arguments, Sweep inserts holes in their places, and moves point to the
+first argument (@pxref{Holes}).
 @item Predicate option completion
-If point is inside a predicates options list,
+If point is inside a predicate options list,
 @code{completion-at-point} suggests matching options or option values
 for the appropriate predicate.
 @item Source file completion
@@ -2127,9 +2127,13 @@ specifications.
 @item Arithmetic function completion
 If point is inside an arithmetic expression,
 @code{completion-at-point} suggests matching arithmetic functions.
+@item Flag completion
+If point is at a position where a Prolog flag should appear (such as
+the first argument of @code{set_prolog_flag/2}),
+@code{completion-at-point} suggests matching flags.
 @item Atom completion
 If point is at a non-callable position, @code{completion-at-point}
-suggests matching atoms and functors as completion candidates.
+suggests matching atoms and functors.
 @end table
 
 @node Insert Term DWIM
diff --git a/sweeprolog-tests.el b/sweeprolog-tests.el
index 7c0ec5bd4c..595b89e030 100644
--- a/sweeprolog-tests.el
+++ b/sweeprolog-tests.el
@@ -464,6 +464,17 @@ baz(Baz) :- bar(Baz).
 "
                    )))
 
+(sweeprolog-deftest cap-flag-name ()
+  "Completion at point for Prolog flag names."
+  "
+foo :-
+    current_prolog_flag(double_q-!-
+"
+  (let ((res (sweeprolog-completion-at-point)))
+    (should (= (nth 0 res) 33))
+    (should (= (nth 1 res) 41))
+    (should (equal (nth 2 res) '("double_quotes")))))
+
 (sweeprolog-deftest cap-option-functor ()
   "Completion at point for predicate option functors."
   "
diff --git a/sweeprolog.el b/sweeprolog.el
index 5b5a00635d..524f808f32 100644
--- a/sweeprolog.el
+++ b/sweeprolog.el
@@ -1559,6 +1559,21 @@ list even when found in the current clause."
         :exclusive 'no
         :annotation-function (lambda (_) " Functor")))
 
+(defun sweeprolog--flag-completion-at-point (beg end)
+  "Return completion candidates for the Prolog flag between BEG and END.
+
+Used for `completion-at-point' candidates in cases such as:
+
+    foo(Bar, Baz) :- set_prolog_flag(ba-!-"
+  (list beg end
+        (sweeprolog--query-once
+         "sweep" "sweep_flags_collection"
+         (cons (buffer-substring-no-properties beg (point))
+               (buffer-substring-no-properties (point) end)))
+        :exclusive 'no
+        :annotation-function
+        (lambda (_) " Flag")))
+
 (defun sweeprolog--atom-or-functor-completion-at-point (beg end)
   "Return completion candidates for the atom or functor between BEG and END.
 
@@ -1590,6 +1605,8 @@ Used for `completion-at-point' candidates in cases such 
as:
        (if fnc
            (sweeprolog-arith-functor-completion-candidates beg end)
          (sweeprolog-arith-completion-candidates beg end)))
+      ("flag"
+       (sweeprolog--flag-completion-at-point beg end))
       (_
        (if fnc
            (sweeprolog-compound-functor-completion-candidates beg end fnc)