[PATCH v2 1/3] Customization of GRUB menu title

["Jiří Wolker via Grub-devel" <grub-devel@gnu.org>]

Since these changes, the module ‘normal’ initializes environment variable
‘grub_menu_title’ with the previously hardcoded text. The variable is
automatically exported, so it applies also to submenus.

Scripts may change this variable to change the title of the menu.
---
 grub-core/normal/main.c | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/grub-core/normal/main.c b/grub-core/normal/main.c
index 96abfda2f..b341cebe0 100644
--- a/grub-core/normal/main.c
+++ b/grub-core/normal/main.c
@@ -203,19 +203,18 @@ grub_normal_init_page (struct grub_term_output *term,
 {
   grub_ssize_t msg_len;
   int posx;
-  char *msg_formatted;
+  const char *msg_title;
   grub_uint32_t *unicode_msg;
   grub_uint32_t *last_position;
 
   grub_term_cls (term);
 
-  msg_formatted = grub_xasprintf (_("GNU GRUB  version %s"), PACKAGE_VERSION);
-  if (!msg_formatted)
+  msg_title = grub_env_get ("grub_menu_title");
+  if (! msg_title)
     return;
 
-  msg_len = grub_utf8_to_ucs4_alloc (msg_formatted,
-  				     &unicode_msg, &last_position);
-  grub_free (msg_formatted);
+  msg_len = grub_utf8_to_ucs4_alloc (msg_title,
+				     &unicode_msg, &last_position);
 
   if (msg_len < 0)
     {
@@ -315,6 +314,16 @@ static grub_err_t
 grub_cmd_normal (struct grub_command *cmd __attribute__ ((unused)),
 		 int argc, char *argv[])
 {
+  if (grub_env_get ("grub_menu_title") == NULL)
+    {
+      /* Initialize the menu title with a GRUB version information. */
+      char *title;
+      title = grub_xasprintf (_("GNU GRUB  version %s"), PACKAGE_VERSION);
+      grub_env_set ("grub_menu_title", title);
+      grub_free (title);
+      grub_env_export ("grub_menu_title");
+    }
+
   if (argc == 0)
     {
       /* Guess the config filename. It is necessary to make CONFIG static,
-- 
2.45.3


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