Minor optimization in timeline retrieving.

Functions now receive an optional int *more, set to 1 if
there are more than the 'show' requested.

activitypub.c

@@ -3081,7 +3081,7 @@ int activitypub_get_handler(const xs_dict *req, const char *q_path,
         int cnt = xs_number_get(xs_dict_get_def(srv_config, "max_public_entries", "20"));
 
         /* get the public outbox or the pinned list */
-        xs *elems = *p_path == 'o' ? timeline_simple_list(&snac, "public", 0, cnt) : pinned_list(&snac);
+        xs *elems = *p_path == 'o' ? timeline_simple_list(&snac, "public", 0, cnt, NULL) : pinned_list(&snac);
 
         xs_list_foreach(elems, v) {
             xs *i = NULL;

data.c

@@ -1489,16 +1489,28 @@ xs_str *user_index_fn(snac *user, const char *idx_name)
 }
 
 
-xs_list *timeline_simple_list(snac *user, const char *idx_name, int skip, int show)
+xs_list *timeline_simple_list(snac *user, const char *idx_name, int skip, int show, int *more)
 /* returns a timeline (with all entries) */
 {
     xs *idx = user_index_fn(user, idx_name);
 
-    return index_list_desc(idx, skip, show);
+    /* if a more flag is sent, request one more */
+    xs_list *lst = index_list_desc(idx, skip, show + (more != NULL ? 1 : 0));
+
+    if (more != NULL) {
+        if (xs_list_len(lst) > show) {
+            *more = 1;
+            lst = xs_list_del(lst, -1);
+        }
+        else
+            *more = 0;
+    }
+
+    return lst;
 }
 
 
-xs_list *timeline_list(snac *snac, const char *idx_name, int skip, int show)
+xs_list *timeline_list(snac *snac, const char *idx_name, int skip, int show, int *more)
 /* returns a timeline (only top level entries) */
 {
     int c_max;
@@ -1510,7 +1522,7 @@ xs_list *timeline_list(snac *snac, const char *idx_name, int skip, int show)
     if (show > c_max)
         show = c_max;
 
-    xs *list = timeline_simple_list(snac, idx_name, skip, show);
+    xs *list = timeline_simple_list(snac, idx_name, skip, show, more);
 
     return timeline_top_level(snac, list);
 }
@@ -2709,9 +2721,9 @@ xs_list *content_search(snac *user, const char *regex,
     const char *md5s[3] = {0};
     int c[3] = {0};
 
-    tls[0] = timeline_simple_list(user, "public", 0, XS_ALL);   /* public */
+    tls[0] = timeline_simple_list(user, "public", 0, XS_ALL, NULL);   /* public */
     tls[1] = timeline_instance_list(0, XS_ALL); /* instance */
-    tls[2] = priv ? timeline_simple_list(user, "private", 0, XS_ALL) : xs_list_new(); /* private or none */
+    tls[2] = priv ? timeline_simple_list(user, "private", 0, XS_ALL, NULL) : xs_list_new(); /* private or none */
 
     /* first positioning */
     for (int n = 0; n < 3; n++)

html.c

@@ -3314,21 +3314,17 @@ int html_get_handler(const xs_dict *req, const char *q_path,
         }
         else {
             xs *list = NULL;
-            xs *next = NULL;
+            int more = 0;
 
-            if (xs_is_true(xs_dict_get(srv_config, "strict_public_timelines"))) {
-                list = timeline_simple_list(&snac, "public", skip, show);
-                next = timeline_simple_list(&snac, "public", skip + show, 1);
-            }
-            else {
-                list = timeline_list(&snac, "public", skip, show);
-                next = timeline_list(&snac, "public", skip + show, 1);
-            }
+            if (xs_is_true(xs_dict_get(srv_config, "strict_public_timelines")))
+                list = timeline_simple_list(&snac, "public", skip, show, &more);
+            else 
+                list = timeline_list(&snac, "public", skip, show, &more);
 
             xs *pins = pinned_list(&snac);
             pins = xs_list_cat(pins, list);
 
-            *body = html_timeline(&snac, pins, 1, skip, show, xs_list_len(next), NULL, "", 1, error);
+            *body = html_timeline(&snac, pins, 1, skip, show, more, NULL, "", 1, error);
 
             *b_size = strlen(*body);
             status  = HTTP_STATUS_OK;
@@ -3490,13 +3486,14 @@ int html_get_handler(const xs_dict *req, const char *q_path,
                                 xs_dict_get(req, "if-none-match"), etag);
                 }
                 else {
+                    int more = 0;
+
                     snac_debug(&snac, 1, xs_fmt("building timeline"));
 
-                    xs *list = timeline_list(&snac, "private", skip, show);
-                    xs *next = timeline_list(&snac, "private", skip + show, 1);
+                    xs *list = timeline_list(&snac, "private", skip, show, &more);
 
                     *body = html_timeline(&snac, list, 0, skip, show,
-                            xs_list_len(next), NULL, "/admin", 1, error);
+                            more, NULL, "/admin", 1, error);
 
                     *b_size = strlen(*body);
                     status  = HTTP_STATUS_OK;
@@ -3702,7 +3699,7 @@ int html_get_handler(const xs_dict *req, const char *q_path,
 
         int cnt = xs_number_get(xs_dict_get_def(srv_config, "max_public_entries", "20"));
 
-        xs *elems = timeline_simple_list(&snac, "public", 0, cnt);
+        xs *elems = timeline_simple_list(&snac, "public", 0, cnt, NULL);
         xs *bio   = xs_dup(xs_dict_get(snac.config, "bio"));
 
         xs *rss_title = xs_fmt("%s (@%s@%s)",

mastoapi.c

@@ -1676,7 +1676,7 @@ int mastoapi_get_handler(const xs_dict *req, const char *q_path,
                 else
                 if (strcmp(opt, "statuses") == 0) { /** **/
                     /* the public list of posts of a user */
-                    xs *timeline = timeline_simple_list(&snac2, "public", 0, 256);
+                    xs *timeline = timeline_simple_list(&snac2, "public", 0, 256, NULL);
                     xs_list *p   = timeline;
                     const xs_str *v;
 

snac.h

@@ -157,8 +157,8 @@ int timeline_here(snac *snac, const char *md5);
 int timeline_get_by_md5(snac *snac, const char *md5, xs_dict **msg);
 int timeline_del(snac *snac, const char *id);
 xs_str *user_index_fn(snac *user, const char *idx_name);
-xs_list *timeline_simple_list(snac *user, const char *idx_name, int skip, int show);
-xs_list *timeline_list(snac *snac, const char *idx_name, int skip, int show);
+xs_list *timeline_simple_list(snac *user, const char *idx_name, int skip, int show, int *more);
+xs_list *timeline_list(snac *snac, const char *idx_name, int skip, int show, int *more);
 int timeline_add(snac *snac, const char *id, const xs_dict *o_msg);
 int timeline_admire(snac *snac, const char *id, const char *admirer, int like);