spell: allow special dict value "-" to disable spell checking on a specific buffer (closes #1699)

src/plugins/spell/spell-command.c

@@ -216,6 +216,7 @@ void
 spell_command_set_dict (struct t_gui_buffer *buffer, const char *value)
 {
     char *name;
+    int disabled;
 
     name = spell_build_option_name (buffer);
     if (!name)
@@ -224,8 +225,16 @@ spell_command_set_dict (struct t_gui_buffer *buffer, const char *value)
     if (spell_config_set_dict (name, value) > 0)
     {
         if (value && value[0])
-            weechat_printf (NULL, "%s: \"%s\" => %s",
-                            SPELL_PLUGIN_NAME, name, value);
+        {
+            disabled = (strcmp (value, "-") == 0);
+            weechat_printf (NULL, "%s: \"%s\" => %s%s%s%s",
+                            SPELL_PLUGIN_NAME,
+                            name,
+                            value,
+                            (disabled) ? " (" : "",
+                            (disabled) ? _("spell checking disabled") : "",
+                            (disabled) ? ")" : "");
+        }
         else
             weechat_printf (NULL, _("%s: \"%s\" removed"),
                             SPELL_PLUGIN_NAME, name);
@@ -472,7 +481,7 @@ spell_command_init ()
         N_("spell plugin configuration"),
         N_("enable|disable|toggle"
            " || listdict"
-           " || setdict <dict>[,<dict>...]"
+           " || setdict -|<dict>[,<dict>...]"
            " || deldict"
            " || addword [<dict>] <word>"),
         N_("  enable: enable spell checker\n"
@@ -480,7 +489,8 @@ spell_command_init ()
            "  toggle: toggle spell checker\n"
            "listdict: show installed dictionaries\n"
            " setdict: set dictionary for current buffer (multiple dictionaries "
-           "can be separated by a comma)\n"
+           "can be separated by a comma, the special value \"-\" disables "
+           "spell checking on current buffer)\n"
            " deldict: delete dictionary used on current buffer\n"
            " addword: add a word in personal dictionary\n"
            "\n"

src/plugins/spell/spell-completion.c

@@ -116,6 +116,9 @@ spell_completion_dicts_cb (const void *pointer, void *data,
                                      0, WEECHAT_LIST_POS_SORT);
     }
 
+    weechat_completion_list_add (completion, "-",
+                                 0, WEECHAT_LIST_POS_BEGINNING);
+
     delete_aspell_dict_info_enumeration (elements);
     delete_aspell_config (config);
 #endif /* USE_ENCHANT */

src/plugins/spell/spell-config.c

@@ -255,7 +255,9 @@ spell_config_dict_create_option (const void *pointer, void *data,
                 ptr_option = weechat_config_new_option (
                     config_file, section,
                     option_name, "string",
-                    _("comma separated list of dictionaries to use on this buffer"),
+                    _("comma separated list of dictionaries to use on this "
+                      "buffer (special value \"-\" disables spell checking "
+                      "on this buffer)"),
                     NULL, 0, 0, "", value, 0,
                     NULL, NULL, NULL,
                     &spell_config_dict_change, NULL, NULL,

src/plugins/spell/spell-speller.c

@@ -97,6 +97,13 @@ spell_speller_check_dictionaries (const char *dict_list)
     char **argv;
     int argc, i;
 
+    if (!dict_list)
+        return;
+
+    /* special value "-" is used to disable spell checking on a buffer */
+    if (strcmp (dict_list, "-") == 0)
+        return;
+
     if (dict_list)
     {
         argv = weechat_string_split (dict_list, ",", NULL,
@@ -381,7 +388,7 @@ spell_speller_buffer_new (struct t_gui_buffer *buffer)
     new_speller_buffer->modifier_result = NULL;
 
     buffer_dicts = spell_get_dict (buffer);
-    if (buffer_dicts)
+    if (buffer_dicts && (strcmp (buffer_dicts, "-") != 0))
     {
         dicts = weechat_string_split (buffer_dicts, ",", NULL,
                                       WEECHAT_STRING_SPLIT_STRIP_LEFT