Hi,

On Mon, Jul 18, 2016 at 2:11 PM, Bram Moolenaar <b...@moolenaar.net> wrote:
>
> The number of commands and functions for quickfix functionality keeps
> growing.  It would be good to reduce this a bit.
>
> getqflist() currently does not take an argument.  It could use an
> argument to specify what to get, instead of the whole list.
> So how about passing a dictionary?  One of the items could be to get the
> aux data instead of the list of errors.
>
> For setqflist() it's a bit more tricky, since it already has a second
> "action" argument.  But we can add the dictionary as the third argument.
>
> Perhaps getting and setting the quickfix title would also fit in here?
> And it allows for the filtering that we had a patch for?
> Would be good to get an overview before making more changes.
>

I am attaching a patch to enhance the getqflist/getloclist() functions to
return the title string and the setqflist()/setloclist() functions to set
the title string.

After this patch is incorporated, it will be easy to add the additional
items (e.g. context, items, number, stack, etc.).

The getqflist/setqflist functions now accept an optional dictionary
parameter. The dictionary parameter specifies which items to get or set.
If the {dict} argument is specified, then the getqflist function returns a
dictionary.

- Yegappan

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diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index 7b421aa..794a169 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -2079,11 +2079,11 @@ getftime({fname})               Number  last 
modification time of file
 getftype({fname})              String  description of type of file {fname}
 getline({lnum})                        String  line {lnum} of current buffer
 getline({lnum}, {end})         List    lines {lnum} to {end} of current buffer
-getloclist({nr})               List    list of location list items
+getloclist({nr}[, {what}])     List    list of location list items
 getmatches()                   List    list of current matches
 getpid()                       Number  process ID of Vim
 getpos({expr})                 List    position of cursor, mark, etc.
-getqflist()                    List    list of quickfix items
+getqflist([{what}])            List    list of quickfix items
 getreg([{regname} [, 1 [, {list}]]])
                                String or List   contents of register
 getregtype([{regname}])                String  type of register
@@ -2238,11 +2238,12 @@ setcharsearch({dict})           Dict    set character 
search from {dict}
 setcmdpos({pos})               Number  set cursor position in command-line
 setfperm({fname}, {mode})      Number  set {fname} file permissions to {mode}
 setline({lnum}, {line})                Number  set line {lnum} to {line}
-setloclist({nr}, {list}[, {action}])
+setloclist({nr}, {list}[, {action}[, {what}]])
                                Number  modify location list using {list}
 setmatches({list})             Number  restore a list of matches
 setpos({expr}, {list})         Number  set the {expr} position to {list}
-setqflist({list}[, {action}])  Number  modify quickfix list using {list}
+setqflist({list}[, {action}[, {what}]])
+                               Number  modify quickfix list using {list}
 setreg({n}, {v}[, {opt}])      Number  set register to value and type
 settabvar({nr}, {varname}, {val}) none set {varname} in tab page {nr} to {val}
 settabwinvar({tabnr}, {winnr}, {varname}, {val})
@@ -4275,7 +4276,7 @@ getline({lnum} [, {end}])
 
 <              To get lines from another buffer see |getbufline()|
 
-getloclist({nr})                                       *getloclist()*
+getloclist({nr},[, {what}])                            *getloclist()*
                Returns a list with all the entries in the location list for
                window {nr}.  {nr} can be the window number or the window ID.
                When {nr} is zero the current window is used.
@@ -4284,6 +4285,10 @@ getloclist({nr})                                 
*getloclist()*
                returned.  For an invalid window number {nr}, an empty list is
                returned. Otherwise, same as |getqflist()|.
 
+               If the optional {what} dictionary argument is supplied, then
+               returns the items listed in {what} as a dictionary. Refer to
+               |getqflist()| for the supported keys in {what}.
+
 getmatches()                                           *getmatches()*
                Returns a |List| with all matches previously defined by
                |matchadd()| and the |:match| commands.  |getmatches()| is
@@ -4334,7 +4339,7 @@ getpos({expr})    Get the position for {expr}.  For 
possible values of {expr}
 <              Also see |getcurpos()| and |setpos()|.
 
 
-getqflist()                                            *getqflist()*
+getqflist([{what}])                                    *getqflist()*
                Returns a list with all the current quickfix errors.  Each
                list item is a dictionary with these entries:
                        bufnr   number of buffer that has the file name, use
@@ -4360,6 +4365,18 @@ getqflist()                                              
*getqflist()*
                        :   echo bufname(d.bufnr) ':' d.lnum '=' d.text
                        :endfor
 
+               If the optional {what} dictionary is argument is supplied, then
+               returns only the items listed in {what} as a dictionary. The
+               following keys are supported in {what}:
+                       title   get quickfix list title
+
+               The value of the key is ignored. Unsupported keys in {what} are
+               ignored. The returned dictionary contains the following entries:
+                       title   quickfix list title text
+
+               Example:>
+                       :echo getqflist({'title':1})
+<
 
 getreg([{regname} [, 1 [, {list}]]])                   *getreg()*
                The result is a String, which is the contents of register
@@ -6496,7 +6513,7 @@ setline({lnum}, {text})                                   
*setline()*
                        :endfor
 <              Note: The '[ and '] marks are not set.
 
-setloclist({nr}, {list} [, {action}])                  *setloclist()*
+setloclist({nr}, {list} [, {action}[, {what}])         *setloclist()*
                Create or replace or add to the location list for window {nr}.
                {nr} can be the window number or the window ID.
                When {nr} is zero the current window is used.
@@ -6506,6 +6523,10 @@ setloclist({nr}, {list} [, {action}])                    
*setloclist()*
                Otherwise, same as |setqflist()|.
                Also see |location-list|.
 
+               If the optional {what} dictionary argument is supplied, then
+               only the items listed in {what} are set. Refer to |setqflist()|
+               for the list of supported keys in {what}.
+
 setmatches({list})                                     *setmatches()*
                Restores a list of matches saved by |getmatches()|.  Returns 0
                if successful, otherwise -1.  All current matches are cleared
@@ -6558,8 +6579,7 @@ setpos({expr}, {list})
                also set the preferred column.  Also see the "curswant" key in
                |winrestview()|.
 
-
-setqflist({list} [, {action}])                         *setqflist()*
+setqflist({list} [, {action}[, {what}]])               *setqflist()*
                Create or replace or add to the quickfix list using the items
                in {list}.  Each item in {list} is a dictionary.
                Non-dictionary items in {list} are ignored.  Each dictionary
@@ -6604,6 +6624,17 @@ setqflist({list} [, {action}])                           
*setqflist()*
                If {action} is not present or is set to ' ', then a new list
                is created.
 
+               If the optional {what} dictionary argument is supplied, then
+               only the items listed in {what} are set. The first {list}
+               argument is ignored.  The following items can be specified in
+               {what}:
+
+                   title       quickfix list title text.
+
+               To change the title for the current list, use 'a' as {action}.
+               Unsupported keys in {what} are ignored. Example:
+                       :call setqflist([], 'a', {'title':'My search'})
+<
                Returns zero for success, -1 for failure.
 
                This function can be used to create a quickfix list
diff --git a/src/Makefile b/src/Makefile
index 001f87a..eac4340 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -567,6 +567,7 @@ CClink = $(CC)
 # statically linked executable.
 # When not defined, configure will try to use -O2 -g for gcc and -O for cc.
 #CFLAGS = -g
+CFLAGS = -g -Wall -Wpedantic
 #CFLAGS = -O
 
 # Optimization limits - depends on the compiler.  Automatic check in configure
@@ -658,7 +659,7 @@ LINT_OPTIONS = -beprxzF
 # address sanitizer or with the undefined sanitizer.  Works with gcc and
 # clang.  May make Vim twice as slow.  Errors reported on stderr.
 # More at: https://code.google.com/p/address-sanitizer/
-#SANITIZER_CFLAGS = -g -O0 -fsanitize=address -fno-omit-frame-pointer
+SANITIZER_CFLAGS = -g -O0 -fsanitize=address -fno-omit-frame-pointer
 #SANITIZER_CFLAGS = -g -O0 -fsanitize=undefined -fno-omit-frame-pointer
 SANITIZER_LIBS = $(SANITIZER_CFLAGS)
 
diff --git a/src/evalfunc.c b/src/evalfunc.c
index ae17038..586c6da 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -170,6 +170,7 @@ static void f_getfsize(typval_T *argvars, typval_T *rettv);
 static void f_getftime(typval_T *argvars, typval_T *rettv);
 static void f_getftype(typval_T *argvars, typval_T *rettv);
 static void f_getline(typval_T *argvars, typval_T *rettv);
+static void f_getloclist(typval_T *argvars UNUSED, typval_T *rettv UNUSED);
 static void f_getmatches(typval_T *argvars, typval_T *rettv);
 static void f_getpid(typval_T *argvars, typval_T *rettv);
 static void f_getcurpos(typval_T *argvars, typval_T *rettv);
@@ -586,11 +587,11 @@ static struct fst
     {"getftime",       1, 1, f_getftime},
     {"getftype",       1, 1, f_getftype},
     {"getline",                1, 2, f_getline},
-    {"getloclist",     1, 1, f_getqflist},
+    {"getloclist",     1, 2, f_getloclist},
     {"getmatches",     0, 0, f_getmatches},
     {"getpid",         0, 0, f_getpid},
     {"getpos",         1, 1, f_getpos},
-    {"getqflist",      0, 0, f_getqflist},
+    {"getqflist",      0, 1, f_getqflist},
     {"getreg",         0, 3, f_getreg},
     {"getregtype",     0, 1, f_getregtype},
     {"gettabvar",      2, 3, f_gettabvar},
@@ -736,10 +737,10 @@ static struct fst
     {"setcmdpos",      1, 1, f_setcmdpos},
     {"setfperm",       2, 2, f_setfperm},
     {"setline",                2, 2, f_setline},
-    {"setloclist",     2, 3, f_setloclist},
+    {"setloclist",     2, 4, f_setloclist},
     {"setmatches",     1, 1, f_setmatches},
     {"setpos",         2, 2, f_setpos},
-    {"setqflist",      1, 2, f_setqflist},
+    {"setqflist",      1, 3, f_setqflist},
     {"setreg",         2, 3, f_setreg},
     {"settabvar",      3, 3, f_settabvar},
     {"settabwinvar",   4, 4, f_settabwinvar},
@@ -4460,6 +4461,42 @@ f_getline(typval_T *argvars, typval_T *rettv)
 }
 
 /*
+ * "getloclist()" function
+ */
+    static void
+f_getloclist(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
+{
+#ifdef FEAT_QUICKFIX
+    win_T      *wp;
+#endif
+
+#ifdef FEAT_QUICKFIX
+    wp = find_win_by_nr(&argvars[0], NULL);
+
+    if (argvars[1].v_type == VAR_UNKNOWN)
+    {
+       if (rettv_list_alloc(rettv) == OK && wp != NULL)
+           (void)get_errorlist(wp, -1, rettv->vval.v_list);
+    }
+    else
+    {
+       if (rettv_dict_alloc(rettv) == OK && wp != NULL)
+       {
+           if (argvars[1].v_type == VAR_DICT)
+           {
+               dict_T  *d = argvars[1].vval.v_dict;
+               if (d != NULL)
+                   get_errorlist_info(wp, argvars[1].vval.v_dict, -1,
+                           rettv->vval.v_dict);
+           }
+           else
+               EMSG(_(e_dictreq));
+       }
+    }
+#endif
+}
+
+/*
  * "getmatches()" function
  */
     static void
@@ -4596,27 +4633,30 @@ f_getpos(typval_T *argvars, typval_T *rettv)
 }
 
 /*
- * "getqflist()" and "getloclist()" functions
+ * "getqflist()" function
  */
     static void
 f_getqflist(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
 {
 #ifdef FEAT_QUICKFIX
-    win_T      *wp;
-#endif
-
-#ifdef FEAT_QUICKFIX
-    if (rettv_list_alloc(rettv) == OK)
+    if (argvars[0].v_type == VAR_UNKNOWN)
     {
-       wp = NULL;
-       if (argvars[0].v_type != VAR_UNKNOWN)   /* getloclist() */
+       if (rettv_list_alloc(rettv) == OK)
+           (void)get_errorlist(NULL, -1, rettv->vval.v_list);
+    }
+    else
+    {
+       if (rettv_dict_alloc(rettv) == OK)
        {
-           wp = find_win_by_nr(&argvars[0], NULL);
-           if (wp == NULL)
-               return;
+           if (argvars[0].v_type == VAR_DICT)
+           {
+               dict_T  *d = argvars[0].vval.v_dict;
+               if (d != NULL)
+                   get_errorlist_info(NULL, d, -1, rettv->vval.v_dict);
+           }
+           else
+               EMSG(_(e_dictreq));
        }
-
-       (void)get_errorlist(wp, rettv->vval.v_list);
     }
 #endif
 }
@@ -9454,7 +9494,7 @@ f_setline(typval_T *argvars, typval_T *rettv)
        appended_lines_mark(lcount, added);
 }
 
-static void set_qf_ll_list(win_T *wp, typval_T *list_arg, typval_T 
*action_arg, typval_T *rettv);
+static void set_qf_ll_list(win_T *wp, typval_T *list_arg, typval_T 
*action_arg, typval_T *what_arg, typval_T *rettv);
 
 /*
  * Used by "setqflist()" and "setloclist()" functions
@@ -9464,6 +9504,7 @@ set_qf_ll_list(
     win_T      *wp UNUSED,
     typval_T   *list_arg UNUSED,
     typval_T   *action_arg UNUSED,
+    typval_T   *what_arg UNUSED,
     typval_T   *rettv)
 {
 #ifdef FEAT_QUICKFIX
@@ -9480,6 +9521,7 @@ set_qf_ll_list(
     else
     {
        list_T  *l = list_arg->vval.v_list;
+       dict_T  *d = NULL;
 
        if (action_arg->v_type == VAR_STRING)
        {
@@ -9496,8 +9538,11 @@ set_qf_ll_list(
        else
            EMSG(_(e_stringreq));
 
+       if (what_arg != NULL && what_arg->v_type == VAR_DICT)
+           d = what_arg->vval.v_dict;
+
        if (l != NULL && action && set_errorlist(wp, l, action,
-              (char_u *)(wp == NULL ? "setqflist()" : "setloclist()")) == OK)
+           (char_u *)(wp == NULL ? "setqflist()" : "setloclist()"), d) == OK)
            rettv->vval.v_number = 0;
     }
 #endif
@@ -9515,7 +9560,15 @@ f_setloclist(typval_T *argvars, typval_T *rettv)
 
     win = find_win_by_nr(&argvars[0], NULL);
     if (win != NULL)
-       set_qf_ll_list(win, &argvars[1], &argvars[2], rettv);
+    {
+       if (argvars[2].v_type == VAR_UNKNOWN ||
+               argvars[3].v_type == VAR_UNKNOWN)
+           set_qf_ll_list(win, &argvars[1], &argvars[2], NULL, rettv);
+       else if (argvars[3].v_type == VAR_DICT)
+           set_qf_ll_list(win, &argvars[1], &argvars[2], &argvars[3], rettv);
+       else
+           EMSG(_(e_dictreq));
+    }
 }
 
 /*
@@ -9681,7 +9734,13 @@ f_setpos(typval_T *argvars, typval_T *rettv)
     static void
 f_setqflist(typval_T *argvars, typval_T *rettv)
 {
-    set_qf_ll_list(NULL, &argvars[0], &argvars[1], rettv);
+    rettv->vval.v_number = -1;
+    if (argvars[1].v_type == VAR_UNKNOWN || argvars[2].v_type == VAR_UNKNOWN)
+       set_qf_ll_list(NULL, &argvars[0], &argvars[1], NULL, rettv);
+    else if (argvars[2].v_type == VAR_DICT)
+       set_qf_ll_list(NULL, &argvars[0], &argvars[1], &argvars[2], rettv);
+    else
+       EMSG(_(e_dictreq));
 }
 
 /*
diff --git a/src/proto/quickfix.pro b/src/proto/quickfix.pro
index 02c2d98..6aa169e 100644
--- a/src/proto/quickfix.pro
+++ b/src/proto/quickfix.pro
@@ -27,8 +27,9 @@ void ex_cnext(exarg_T *eap);
 void ex_cfile(exarg_T *eap);
 void ex_vimgrep(exarg_T *eap);
 char_u *skip_vimgrep_pat(char_u *p, char_u **s, int *flags);
-int get_errorlist(win_T *wp, list_T *list);
-int set_errorlist(win_T *wp, list_T *list, int action, char_u *title);
+int get_errorlist_info(win_T *wp, dict_T *what, int qf_idx, dict_T *retdict);
+int get_errorlist(win_T *wp, int qf_idx, list_T *list);
+int set_errorlist(win_T *wp, list_T *list, int action, char_u *title, dict_T 
*what);
 void ex_cbuffer(exarg_T *eap);
 void ex_cexpr(exarg_T *eap);
 void ex_helpgrep(exarg_T *eap);
diff --git a/src/quickfix.c b/src/quickfix.c
index b607170..c190df8 100644
--- a/src/quickfix.c
+++ b/src/quickfix.c
@@ -3151,6 +3151,24 @@ qf_find_buf(qf_info_T *qi)
 }
 
 /*
+ * Update the w:quickfix_title variable in the quickfix/location list window
+ */
+    static void
+qf_update_win_titlevar(qf_info_T *qi)
+{
+    win_T      *win;
+    win_T      *curwin_save;
+
+    if ((win = qf_find_win(qi)) != NULL)
+    {
+       curwin_save = curwin;
+       curwin = win;
+       qf_set_title_var(qi);
+       curwin = curwin_save;
+    }
+}
+
+/*
  * Find the quickfix buffer.  If it exists, update the contents.
  */
     static void
@@ -3158,7 +3176,6 @@ qf_update_buffer(qf_info_T *qi, qfline_T *old_last)
 {
     buf_T      *buf;
     win_T      *win;
-    win_T      *curwin_save;
     aco_save_T aco;
 
     /* Check if a buffer for the quickfix list exists.  Update it. */
@@ -3171,13 +3188,7 @@ qf_update_buffer(qf_info_T *qi, qfline_T *old_last)
            /* set curwin/curbuf to buf and save a few things */
            aucmd_prepbuf(&aco, buf);
 
-       if ((win = qf_find_win(qi)) != NULL)
-       {
-           curwin_save = curwin;
-           curwin = win;
-           qf_set_title_var(qi);
-           curwin = curwin_save;
-       }
+       qf_update_win_titlevar(qi);
 
        qf_fill_buffer(qi, buf, old_last);
 
@@ -4542,9 +4553,10 @@ unload_dummy_buffer(buf_T *buf, char_u *dirname_start)
 #if defined(FEAT_EVAL) || defined(PROTO)
 /*
  * Add each quickfix error to list "list" as a dictionary.
+ * If qf_idx is -1, use the current list. Otherwise, use the specified list.
  */
     int
-get_errorlist(win_T *wp, list_T *list)
+get_errorlist(win_T *wp, int qf_idx, list_T *list)
 {
     qf_info_T  *qi = &ql_info;
     dict_T     *dict;
@@ -4560,12 +4572,15 @@ get_errorlist(win_T *wp, list_T *list)
            return FAIL;
     }
 
-    if (qi->qf_curlist >= qi->qf_listcount
-           || qi->qf_lists[qi->qf_curlist].qf_count == 0)
+    if (qf_idx == -1)
+       qf_idx = qi->qf_curlist;
+
+    if (qf_idx >= qi->qf_listcount
+           || qi->qf_lists[qf_idx].qf_count == 0)
        return FAIL;
 
-    qfp = qi->qf_lists[qi->qf_curlist].qf_start;
-    for (i = 1; !got_int && i <= qi->qf_lists[qi->qf_curlist].qf_count; ++i)
+    qfp = qi->qf_lists[qf_idx].qf_start;
+    for (i = 1; !got_int && i <= qi->qf_lists[qf_idx].qf_count; ++i)
     {
        /* Handle entries with a non-existing buffer number. */
        bufnum = qfp->qf_fnum;
@@ -4600,54 +4615,78 @@ get_errorlist(win_T *wp, list_T *list)
 }
 
 /*
- * Populate the quickfix list with the items supplied in the list
- * of dictionaries. "title" will be copied to w:quickfix_title.
- * "action" is 'a' for add, 'r' for replace.  Otherwise create a new list.
+ * Return quickfix/location list details (title) as a
+ * dictionary. 'what' contains the details to return. If 'list_idx' is -1,
+ * then current list is used. Otherwise the specified list is used.
  */
     int
-set_errorlist(
-    win_T      *wp,
-    list_T     *list,
-    int                action,
-    char_u     *title)
+get_errorlist_info(win_T *wp, dict_T *what, int qf_idx, dict_T *retdict)
 {
-    listitem_T *li;
-    dict_T     *d;
-    char_u     *filename, *pattern, *text, *type;
-    int                bufnum;
-    long       lnum;
-    int                col, nr;
-    int                vcol;
-#ifdef FEAT_WINDOWS
-    qfline_T   *old_last = NULL;
-#endif
-    int                valid, status;
-    int                retval = OK;
     qf_info_T  *qi = &ql_info;
-    int                did_bufnr_emsg = FALSE;
+    int                status = FAIL;
 
     if (wp != NULL)
     {
-       qi = ll_get_or_alloc_list(wp);
+       qi = GET_LOC_LIST(wp);
        if (qi == NULL)
            return FAIL;
     }
 
-    if (action == ' ' || qi->qf_curlist == qi->qf_listcount)
-       /* make place for a new list */
-       qf_new_list(qi, title);
-#ifdef FEAT_WINDOWS
-    else if (action == 'a' && qi->qf_lists[qi->qf_curlist].qf_count > 0)
-       /* Adding to existing list, use last entry. */
-       old_last = qi->qf_lists[qi->qf_curlist].qf_last;
-#endif
-    else if (action == 'r')
+    if (qf_idx == -1)
+       qf_idx = qi->qf_curlist;
+
+    if (dict_find(what, (char_u *)"title", -1) != NULL)
     {
-       qf_free(qi, qi->qf_curlist);
-       qf_store_title(qi, title);
+       char_u  *t;
+       t = qi->qf_lists[qf_idx].qf_title;
+       if (t == NULL)
+           t = (char_u *)"";
+       status = dict_add_nr_str(retdict, "title", 0L, t);
     }
 
-    for (li = list->lv_first; li != NULL; li = li->li_next)
+    return status;
+}
+
+    static int
+qf_set_properties(qf_info_T *qi, dict_T *what, int append, qfline_T *old_last)
+{
+    dictitem_T *di;
+    int                retval = FAIL;
+
+    if ((di = dict_find(what, (char_u *)"title", -1)) != NULL)
+    {
+       if (di->di_tv.v_type == VAR_STRING)
+       {
+           vim_free(qi->qf_lists[qi->qf_curlist].qf_title);
+           qi->qf_lists[qi->qf_curlist].qf_title =
+               get_dict_string(what, (char_u *)"title", TRUE);
+           qf_update_win_titlevar(qi);
+           retval = OK;
+       }
+    }
+
+    return retval;
+}
+
+/*
+ * Add list of entries to quickfix/location list. Each list entry is
+ * a dictionary with item information.
+ */
+    static int
+qf_add_entries(qf_info_T *qi, list_T *l, int append, qfline_T *old_last)
+{
+    listitem_T *li;
+    dict_T     *d;
+    char_u     *filename, *pattern, *text, *type;
+    int                bufnum;
+    long       lnum;
+    int                col, nr;
+    int                vcol;
+    int                valid, status;
+    int                did_bufnr_emsg = FALSE;
+    int                retval = OK;
+
+    for (li = l->lv_first; li != NULL; li = li->li_next)
     {
        if (li->li_tv.v_type != VAR_DICT)
            continue; /* Skip non-dict items */
@@ -4715,7 +4754,7 @@ set_errorlist(
        qi->qf_lists[qi->qf_curlist].qf_nonevalid = TRUE;
     else
        qi->qf_lists[qi->qf_curlist].qf_nonevalid = FALSE;
-    if (action != 'a') {
+    if (!append) {
        qi->qf_lists[qi->qf_curlist].qf_ptr =
            qi->qf_lists[qi->qf_curlist].qf_start;
        if (qi->qf_lists[qi->qf_curlist].qf_count > 0)
@@ -4729,6 +4768,55 @@ set_errorlist(
 
     return retval;
 }
+
+
+/*
+ * Populate the quickfix list with the items supplied in the list
+ * of dictionaries. "title" will be copied to w:quickfix_title.
+ * "action" is 'a' for add, 'r' for replace.  Otherwise create a new list.
+ */
+    int
+set_errorlist(
+    win_T      *wp,
+    list_T     *list,
+    int                action,
+    char_u     *title,
+    dict_T     *what)
+{
+#ifdef FEAT_WINDOWS
+    qfline_T   *old_last = NULL;
+#endif
+    int                retval = OK;
+    qf_info_T  *qi = &ql_info;
+
+    if (wp != NULL)
+    {
+       qi = ll_get_or_alloc_list(wp);
+       if (qi == NULL)
+           return FAIL;
+    }
+
+    if (action == ' ' || qi->qf_curlist == qi->qf_listcount)
+       /* make place for a new list */
+       qf_new_list(qi, title);
+#ifdef FEAT_WINDOWS
+    else if (action == 'a' && qi->qf_lists[qi->qf_curlist].qf_count > 0)
+       /* Adding to existing list, use last entry. */
+       old_last = qi->qf_lists[qi->qf_curlist].qf_last;
+#endif
+    else if (action == 'r')
+    {
+       qf_free(qi, qi->qf_curlist);
+       qf_store_title(qi, title);
+    }
+
+    if (what != NULL)
+       retval = qf_set_properties(qi, what, (action == 'a'), old_last);
+    else
+       retval = qf_add_entries(qi, list, (action == 'a'), old_last);
+
+    return retval;
+}
 #endif
 
 /*
diff --git a/src/tag.c b/src/tag.c
index cfc2b51..e388a43 100644
--- a/src/tag.c
+++ b/src/tag.c
@@ -916,7 +916,7 @@ do_tag(
                }
 
                vim_snprintf((char *)IObuff, IOSIZE, "ltag %s", tag);
-               set_errorlist(curwin, list, ' ', IObuff);
+               set_errorlist(curwin, list, ' ', IObuff, NULL);
 
                list_free(list);
                vim_free(fname);
diff --git a/src/testdir/test_quickfix.vim b/src/testdir/test_quickfix.vim
index e79315b..6e38bbd 100644
--- a/src/testdir/test_quickfix.vim
+++ b/src/testdir/test_quickfix.vim
@@ -1504,3 +1504,37 @@ func Test_duplicate_buf()
 
   call delete('Xgrepthis')
 endfunc
+
+" Quickfix/Location list title text test
+function Xtitle_set_Tests(cchar)
+    call s:setup_commands(a:cchar)
+
+    " Set and get the title
+    Xopen
+    wincmd p
+    call g:Xsetlist([{'filename':'foo', 'lnum':27}])
+    call g:Xsetlist([], 'a', {'title' : 'Sample'})
+    let d = g:Xgetlist({'title':1})
+    call assert_equal('Sample', d.title)
+
+    Xopen
+    call assert_equal('Sample', w:quickfix_title)
+    Xclose
+
+    " Invalid arguments
+    call assert_fails('call g:Xgetlist([])', 'E715')
+    call assert_fails('call g:Xsetlist([], "a", [])', 'E715')
+    let s = g:Xsetlist([], 'a', {'abc':1})
+    call assert_equal(-1, s)
+
+    call assert_equal({}, g:Xgetlist({'abc':1}))
+
+    if a:cchar == 'l'
+       call assert_equal({}, getloclist(99, {'title':1}))
+    endif
+endfunction
+
+function Test_set_title()
+    call Xtitle_set_Tests('c')
+    call Xtitle_set_Tests('l')
+endfunction

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