patch 8.0.0499: taglist() does not prioritize tags for a buffer

Problem:    taglist() does not prioritize tags for a buffer.
Solution:   Add an optional buffer argument. (Duncan McDougall, closes #1194)

runtime/doc/eval.txt

@@ -2363,7 +2363,7 @@ systemlist({expr} [, {input}])	List	output of shell command/filter {expr}
 tabpagebuflist([{arg}])		List	list of buffer numbers in tab page
 tabpagenr([{arg}])		Number	number of current or last tab page
 tabpagewinnr({tabarg}[, {arg}]) Number	number of current window in tab page
-taglist({expr})			List	list of tags matching {expr}
+taglist({expr}[, {filename}])	List	list of tags matching {expr}
 tagfiles()			List	tags files used
 tan({expr})			Float	tangent of {expr}
 tanh({expr})			Float	hyperbolic tangent of {expr}
@@ -7741,8 +7741,13 @@ tagfiles()	Returns a |List| with the file names used to search for tags
 		for the current buffer.  This is the 'tags' option expanded.
 
 
-taglist({expr})							*taglist()*
+taglist({expr}[, {filename}])				*taglist()*
 		Returns a list of tags matching the regular expression {expr}.
+
+		If {filename} is passed it is used to prioritize the results
+		in the same way that |:tselect| does. See |tag-priority|.
+		{filename} should be the full path of the file.
+
 		Each list item is a dictionary with at least the following
 		entries:
 			name		Name of the tag.

src/Makefile

@@ -2213,6 +2213,7 @@ test_arglist \
 	test_tabpage \
 	test_tagcase \
 	test_tagjump \
+	test_taglist \
 	test_tcl \
 	test_textobjects \
 	test_timers \

src/evalfunc.c

@@ -824,7 +824,7 @@ static struct fst
     {"tabpagenr",	0, 1, f_tabpagenr},
     {"tabpagewinnr",	1, 2, f_tabpagewinnr},
     {"tagfiles",	0, 0, f_tagfiles},
-    {"taglist",		1, 1, f_taglist},
+    {"taglist",		1, 2, f_taglist},
 #ifdef FEAT_FLOAT
     {"tan",		1, 1, f_tan},
     {"tanh",		1, 1, f_tanh},
@@ -3589,7 +3589,8 @@ f_foldtextresult(typval_T *argvars UNUSED, typval_T *rettv)
     fold_count = foldedCount(curwin, lnum, &foldinfo);
     if (fold_count > 0)
     {
-	text = get_foldtext(curwin, lnum, lnum + fold_count - 1, &foldinfo, buf);
+	text = get_foldtext(curwin, lnum, lnum + fold_count - 1,
+							       &foldinfo, buf);
 	if (text == buf)
 	    text = vim_strsave(text);
 	rettv->vval.v_string = text;
@@ -12267,6 +12268,7 @@ f_tagfiles(typval_T *argvars UNUSED, typval_T *rettv)
     static void
 f_taglist(typval_T *argvars, typval_T *rettv)
 {
+    char_u  *fname = NULL;
     char_u  *tag_pattern;
 
     tag_pattern = get_tv_string(&argvars[0]);
@@ -12275,8 +12277,10 @@ f_taglist(typval_T *argvars, typval_T *rettv)
     if (*tag_pattern == NUL)
 	return;
 
+    if (argvars[1].v_type != VAR_UNKNOWN)
+	fname = get_tv_string(&argvars[1]);
     if (rettv_list_alloc(rettv) == OK)
-	(void)get_tags(rettv->vval.v_list, tag_pattern);
+	(void)get_tags(rettv->vval.v_list, tag_pattern, fname);
 }
 
 /*

src/proto/tag.pro

@@ -8,5 +8,5 @@ int get_tagfname(tagname_T *tnp, int first, char_u *buf);
 void tagname_free(tagname_T *tnp);
 void simplify_filename(char_u *filename);
 int expand_tags(int tagnames, char_u *pat, int *num_file, char_u ***file);
-int get_tags(list_T *list, char_u *pat);
+int get_tags(list_T *list, char_u *pat, char_u *buf_fname);
 /* vim: set ft=c : */

src/tag.c

@@ -3876,11 +3876,11 @@ add_tag_field(
 }
 
 /*
- * Add the tags matching the specified pattern to the list "list"
+ * Add the tags matching the specified pattern "pat" to the list "list"
- * as a dictionary
+ * as a dictionary. Use "buf_fname" for priority, unless NULL.
  */
     int
-get_tags(list_T *list, char_u *pat)
+get_tags(list_T *list, char_u *pat, char_u *buf_fname)
 {
     int		num_matches, i, ret;
     char_u	**matches, *p;
@@ -3890,7 +3890,7 @@ get_tags(list_T *list, char_u *pat)
     long	is_static;
 
     ret = find_tags(pat, &num_matches, &matches,
-				    TAG_REGEXP | TAG_NOIC, (int)MAXCOL, NULL);
+				TAG_REGEXP | TAG_NOIC, (int)MAXCOL, buf_fname);
     if (ret == OK && num_matches > 0)
     {
 	for (i = 0; i < num_matches; ++i)

src/testdir/test_alot.vim

@@ -47,6 +47,7 @@ source test_tabline.vim
 source test_tabpage.vim
 source test_tagcase.vim
 source test_tagjump.vim
+source test_taglist.vim
 source test_timers.vim
 source test_true_false.vim
 source test_unlet.vim

src/testdir/test_taglist.vim

@@ -0,0 +1,21 @@
+" test 'taglist' function
+
+func Test_taglist()
+  call writefile([
+	\ "FFoo\tXfoo\t1",
+	\ "FBar\tXfoo\t2",
+	\ "BFoo\tXbar\t1",
+	\ "BBar\tXbar\t2"
+	\ ], 'Xtags')
+  set tags=Xtags
+  split Xtext
+
+  call assert_equal(['FFoo', 'BFoo'], map(taglist("Foo"), {i, v -> v.name}))
+  call assert_equal(['FFoo', 'BFoo'], map(taglist("Foo", "Xtext"), {i, v -> v.name}))
+  call assert_equal(['FFoo', 'BFoo'], map(taglist("Foo", "Xfoo"), {i, v -> v.name}))
+  call assert_equal(['BFoo', 'FFoo'], map(taglist("Foo", "Xbar"), {i, v -> v.name}))
+
+  call delete('Xtags')
+  bwipe
+endfunc
+

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    499,
 /**/
     498,
 /**/