core: allow value "0" in buffer property "unread" to remove read marker from buffer

ChangeLog.adoc

@@ -20,6 +20,7 @@ https://weechat.org/files/releasenotes/ReleaseNotes-devel.html[release notes]
 
 New features::
 
+  * core: allow value "0" in buffer property "unread" to remove read marker from buffer
   * core: add command `/allbuf`
   * core: add command `/hotlist`
   * core: move some `/input` actions to commands `/allbuf`, `/buffer` and `/hotlist`

doc/en/weechat_plugin_api.en.adoc

@@ -13785,8 +13785,9 @@ Properties:
   "1": do not stop completion when command line is updated
   (global setting, buffer pointer is not used).
 
-| unread | | -
-| Set unread marker after last line of buffer.
+| unread | | empty string or "0"
+| empty string: set unread marker after last line of buffer +
+  "0": remove unread marker from buffer.
 
 | display | | "1" or "auto"
 | "1": switch to this buffer in current window +

doc/fr/weechat_plugin_api.fr.adoc

@@ -14084,8 +14084,10 @@ Propriétés :
   "1" : ne pas arrêter la complétion lorsque la ligne de commande est mise à
   jour (option globale, le pointeur vers le tampon n'est pas utilisé).
 
-| unread | | -
-| Définit le marqueur de données non lues après la dernière ligne du tampon.
+| unread | | chaîne vide ou "0"
+| chaîne vide : définit le marqueur de données non lues après la dernière ligne
+  du tampon +
+  "0" : supprime le marqueur de données non lues du tampon.
 
 | display | | "1" ou "auto"
 | "1" : basculer vers ce tampon dans la fenêtre active +

doc/it/weechat_plugin_api.it.adoc

@@ -14427,8 +14427,10 @@ Properties:
   "1": do not stop completion when command line is updated
   (impostazione globale, il puntatore al buffer non è utilizzato).
 
-| unread | | -
-| Imposta l'evidenziatore di lettura dopo l'ultima riga del buffer.
+// TRANSLATION MISSING
+| unread | | empty string or "0"
+| empty string: set unread marker after last line of buffer +
+  "0": remove unread marker from buffer.
 
 | display | | "1" oppure "auto"
 | "1": passa a questo buffer nella finestra corrente +

doc/ja/weechat_plugin_api.ja.adoc

@@ -13936,8 +13936,10 @@ void weechat_buffer_set (struct t_gui_buffer *buffer, const char *property,
   "1": コマンドラインが更新された際に補完を継続する
   (グローバル設定、バッファへのポインタは使われない)
 
-| unread | | -
-| バッファの最後の行の後に未読マーカーを設定
+// TRANSLATION MISSING
+| unread | | empty string or "0"
+| empty string: set unread marker after last line of buffer +
+  "0": remove unread marker from buffer.
 
 | display | | "1" または "auto"
 | "1": 指定したバッファを現在のウィンドウに表示 +

doc/sr/weechat_plugin_api.sr.adoc

@@ -13356,8 +13356,10 @@ void weechat_buffer_set (struct t_gui_buffer *buffer, const char *property,
   "1": довршавање се не зауставља када се ажурира командна линија
   (глобално подешавање, не користи се показивач на бафер).
 
-| unread | | -
-| Поставља маркер непрочитаних линија након последње линије бафера.
+// TRANSLATION MISSING
+| unread | | empty string or "0"
+| empty string: set unread marker after last line of buffer +
+  "0": remove unread marker from buffer.
 
 | display | | "1" или "auto"
 | "1": прелазак на овај бафер у текућем прозору +

src/gui/gui-buffer.c

@@ -2107,21 +2107,34 @@ gui_buffer_set_input_multiline (struct t_gui_buffer *buffer,
 
 /*
  * Sets unread marker for a buffer.
+ *
+ * If remove_marker == 1, then unread marker is removed, otherwise it's set
+ * after the last line.
  */
 
 void
-gui_buffer_set_unread (struct t_gui_buffer *buffer)
+gui_buffer_set_unread (struct t_gui_buffer *buffer, int remove_marker)
 {
     int refresh;
 
     if (!buffer || (buffer->type != GUI_BUFFER_TYPE_FORMATTED))
         return;
 
-    refresh = ((buffer->lines->last_read_line != NULL)
-               && (buffer->lines->last_read_line != buffer->lines->last_line));
-
-    buffer->lines->last_read_line = buffer->lines->last_line;
-    buffer->lines->first_line_not_read = (buffer->lines->last_read_line) ? 0 : 1;
+    if (remove_marker)
+    {
+        /* remove unread marker */
+        refresh = (buffer->lines->last_read_line != NULL);
+        buffer->lines->last_read_line = NULL;
+        buffer->lines->first_line_not_read = 0;
+    }
+    else
+    {
+        /* set unread marker after last line */
+        refresh = ((buffer->lines->last_read_line != NULL)
+                   && (buffer->lines->last_read_line != buffer->lines->last_line));
+        buffer->lines->last_read_line = buffer->lines->last_line;
+        buffer->lines->first_line_not_read = (buffer->lines->last_read_line) ? 0 : 1;
+    }
 
     if (refresh)
         gui_buffer_ask_chat_refresh (buffer, 2);
@@ -2135,7 +2148,7 @@ void
 gui_buffer_set (struct t_gui_buffer *buffer, const char *property,
                 const char *value)
 {
-    int gui_chat_mute_old;
+    int gui_chat_mute_old, remove_marker;
     long number;
     char *error;
     const char *ptr_notify;
@@ -2182,7 +2195,8 @@ gui_buffer_set (struct t_gui_buffer *buffer, const char *property,
     /* properties that need a buffer */
     if (string_strcasecmp (property, "unread") == 0)
     {
-        gui_buffer_set_unread (buffer);
+        remove_marker = (strcmp (value, "0") == 0);
+        gui_buffer_set_unread (buffer, remove_marker);
     }
     else if (string_strcasecmp (property, "display") == 0)
     {

src/gui/gui-buffer.h

@@ -330,7 +330,8 @@ extern void gui_buffer_set_highlight_tags (struct t_gui_buffer *buffer,
                                            const char *new_tags);
 extern void gui_buffer_set_hotlist_max_level_nicks (struct t_gui_buffer *buffer,
                                                     const char *new_hotlist_max_level_nicks);
-extern void gui_buffer_set_unread (struct t_gui_buffer *buffer);
+extern void gui_buffer_set_unread (struct t_gui_buffer *buffer,
+                                   int remove_marker);
 extern void gui_buffer_set (struct t_gui_buffer *buffer, const char *property,
                             const char *value);
 extern void gui_buffer_set_pointer (struct t_gui_buffer *buffer,