api: add support of format/translation of command arguments description line by line (issue #2005)

src/plugins/weechat-plugin.h

@@ -220,6 +220,19 @@ struct timeval;
 #define WEECHAT_STR_CONCAT(separator, argz...)                          \
     weechat_string_concat (separator, ##argz, NULL)
 
+/*
+ * string used at beginning of arguments description to format the help text
+ * and translate it line by line
+ */
+#define WEECHAT_HOOK_COMMAND_STR_FORMATTED "[fmt]"
+
+/* macro to concatenate strings for description of command arguments */
+#define WEECHAT_CMD_ARGS_DESC(args...)                                  \
+    WEECHAT_STR_CONCAT(                                                 \
+        "\n",                                                           \
+        WEECHAT_HOOK_COMMAND_STR_FORMATTED,                             \
+        ##args)
+
 /*
  * macro to return error in case of missing arguments in callback of
  * hook_command
@@ -1248,6 +1261,7 @@ extern int weechat_plugin_end (struct t_weechat_plugin *plugin);
 #define NG_(single,plural,number)                                       \
     (weechat_plugin->ngettext)(single, plural, number)
 #endif /* NG_ */
+#define AI(string) (string)
 #endif /* WEECHAT_H */
 #define weechat_gettext(string) (weechat_plugin->gettext)(string)
 #define weechat_ngettext(single,plural,number)                          \