support scrolling menu entry's text (#1539)

GRUB2/MOD_SRC/grub-2.04/grub-core/gfxmenu/gfxmenu.c

@@ -119,6 +119,8 @@ grub_gfxmenu_try (int entry, grub_menu_t menu, int nested)
   view->menu = menu;
   view->nested = nested;
   view->first_timeout = -1;
+  if (menu->size)
+    view->menu_title_offset = grub_zalloc (sizeof (*view->menu_title_offset) * menu->size);
 
   grub_video_set_viewport (0, 0, mode_info.width, mode_info.height);
   if (view->double_repaint)
@@ -134,6 +136,8 @@ grub_gfxmenu_try (int entry, grub_menu_t menu, int nested)
   instance->fini = grub_gfxmenu_viewer_fini;
   instance->print_timeout = grub_gfxmenu_print_timeout;
   instance->clear_timeout = grub_gfxmenu_clear_timeout;
+  if (view->menu_title_offset)
+    instance->scroll_chosen_entry = grub_gfxmenu_scroll_chosen_entry;
 
   grub_menu_register_viewer (instance);
 

GRUB2/MOD_SRC/grub-2.04/grub-core/gfxmenu/view.c

@@ -37,6 +37,7 @@
 #include <grub/gui_string_util.h>
 #include <grub/icon_manager.h>
 #include <grub/i18n.h>
+#include <grub/charset.h>
 
 static void
 init_terminal (grub_gfxmenu_view_t view);
@@ -142,6 +143,8 @@ grub_gfxmenu_view_destroy (grub_gfxmenu_view_t view)
   grub_free (view->title_text);
   grub_free (view->progress_message_text);
   grub_free (view->theme_path);
+  if (view->menu_title_offset)
+    grub_free (view->menu_title_offset);
   if (view->canvas)
     view->canvas->component.ops->destroy (view->canvas);
   grub_free (view);
@@ -428,6 +431,27 @@ grub_gfxmenu_set_chosen_entry (int entry, void *data)
   
 }
 
+void
+grub_gfxmenu_scroll_chosen_entry (void *data, int diren)
+{
+  grub_gfxmenu_view_t view = data;
+  const char *item_title;
+  int off;
+
+  if (!view->menu->size)
+    return;
+
+  item_title = grub_menu_get_entry (view->menu, view->selected)->title;
+  off = view->menu_title_offset[view->selected] + diren;
+
+  if (off < 0
+      || off > grub_utf8_get_num_code (item_title, grub_strlen(item_title)))
+    return;
+
+  view->menu_title_offset[view->selected] = off;
+  grub_gfxmenu_redraw_menu (view);
+}
+
 static void
 grub_gfxmenu_draw_terminal_box (void)
 {

GRUB2/MOD_SRC/grub-2.04/grub-core/normal/menu.c

@@ -461,6 +461,15 @@ menu_set_chosen_entry (grub_menu_t menu, int entry)
     cur->set_chosen_entry (entry, cur->data);
 }
 
+static void
+menu_scroll_chosen_entry (int diren)
+{
+  struct grub_menu_viewer *cur;
+  for (cur = viewers; cur; cur = cur->next)
+    if (cur->scroll_chosen_entry)
+      cur->scroll_chosen_entry (cur->data, diren);
+}
+
 static void
 menu_print_timeout (int timeout)
 {
@@ -846,6 +855,13 @@ run_menu (grub_menu_t menu, int nested, int *auto_boot)
 	      menu_set_chosen_entry (menu, current_entry);
 	      break;
 
+	    case GRUB_TERM_KEY_RIGHT:
+	      menu_scroll_chosen_entry (1);
+	      break;
+	    case GRUB_TERM_KEY_LEFT:
+	      menu_scroll_chosen_entry (-1);
+	      break;
+
 	    case '\n':
 	    case '\r':
 	//    case GRUB_TERM_KEY_RIGHT:

GRUB2/MOD_SRC/grub-2.04/grub-core/normal/menu_text.c

@@ -42,6 +42,7 @@ struct menu_viewer_data
     TIMEOUT_TERSE_NO_MARGIN
   } timeout_msg;
   grub_menu_t menu;
+  int *menu_title_offset;
   struct grub_term_output *term;
 };
 
@@ -524,6 +525,37 @@ menu_text_set_chosen_entry (int entry, void *dataptr)
   grub_term_refresh (data->term);
 }
 
+static void
+menu_text_scroll_chosen_entry (void *dataptr, int diren)
+{
+  struct menu_viewer_data *data = dataptr;
+  const char *orig_title, *scrolled_title;
+  int off;
+  int selected;
+  grub_menu_entry_t entry;
+
+  if (!data->menu->size)
+    return;
+
+  selected = data->first + data->offset;
+  entry = grub_menu_get_entry (data->menu, selected);
+  orig_title = entry->title;
+  off = data->menu_title_offset[selected] + diren;
+  if (off < 0
+      || off > grub_utf8_get_num_code (orig_title, grub_strlen(orig_title)))
+    return;
+
+  scrolled_title =
+    grub_utf8_offset_code (orig_title, grub_strlen (orig_title), off);
+  if (scrolled_title)
+    entry->title = scrolled_title;
+  print_entry (data->geo.first_entry_y + data->offset, 1, entry, data);
+
+  entry->title = orig_title;
+  data->menu_title_offset[selected] = off;
+  grub_term_refresh (data->term);
+}
+
 static void
 menu_text_fini (void *dataptr)
 {
@@ -531,6 +563,8 @@ menu_text_fini (void *dataptr)
 
   grub_term_setcursor (data->term, 1);
   grub_term_cls (data->term);
+  if (data->menu_title_offset)
+    grub_free (data->menu_title_offset);
   grub_free (data);
 }
 
@@ -585,9 +619,14 @@ grub_menu_try_text (struct grub_term_output *term,
       return grub_errno;
     }
 
+  if (menu->size)
+    data->menu_title_offset = grub_zalloc (sizeof (*data->menu_title_offset) * menu->size);
+
   data->term = term;
   instance->data = data;
   instance->set_chosen_entry = menu_text_set_chosen_entry;
+  if (data->menu_title_offset)
+    instance->scroll_chosen_entry = menu_text_scroll_chosen_entry;
   instance->print_timeout = menu_text_print_timeout;
   instance->clear_timeout = menu_text_clear_timeout;
   instance->fini = menu_text_fini;

GRUB2/MOD_SRC/grub-2.04/include/grub/charset.h

+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_CHARSET_HEADER
+#define GRUB_CHARSET_HEADER	1
+
+#include <grub/types.h>
+
+#define GRUB_UINT8_1_LEADINGBIT 0x80
+#define GRUB_UINT8_2_LEADINGBITS 0xc0
+#define GRUB_UINT8_3_LEADINGBITS 0xe0
+#define GRUB_UINT8_4_LEADINGBITS 0xf0
+#define GRUB_UINT8_5_LEADINGBITS 0xf8
+#define GRUB_UINT8_6_LEADINGBITS 0xfc
+#define GRUB_UINT8_7_LEADINGBITS 0xfe
+
+#define GRUB_UINT8_1_TRAILINGBIT 0x01
+#define GRUB_UINT8_2_TRAILINGBITS 0x03
+#define GRUB_UINT8_3_TRAILINGBITS 0x07
+#define GRUB_UINT8_4_TRAILINGBITS 0x0f
+#define GRUB_UINT8_5_TRAILINGBITS 0x1f
+#define GRUB_UINT8_6_TRAILINGBITS 0x3f
+
+#define GRUB_MAX_UTF8_PER_UTF16 4
+/* You need at least one UTF-8 byte to have one UTF-16 word.
+   You need at least three UTF-8 bytes to have 2 UTF-16 words (surrogate pairs).
+ */
+#define GRUB_MAX_UTF16_PER_UTF8 1
+#define GRUB_MAX_UTF8_PER_CODEPOINT 4
+
+#define GRUB_UCS2_LIMIT 0x10000
+#define GRUB_UTF16_UPPER_SURROGATE(code) \
+  (0xD800 | ((((code) - GRUB_UCS2_LIMIT) >> 10) & 0x3ff))
+#define GRUB_UTF16_LOWER_SURROGATE(code) \
+  (0xDC00 | (((code) - GRUB_UCS2_LIMIT) & 0x3ff))
+
+/* Process one character from UTF8 sequence. 
+   At beginning set *code = 0, *count = 0. Returns 0 on failure and
+   1 on success. *count holds the number of trailing bytes.  */
+static inline int
+grub_utf8_process (grub_uint8_t c, grub_uint32_t *code, int *count)
+{
+  if (*count)
+    {
+      if ((c & GRUB_UINT8_2_LEADINGBITS) != GRUB_UINT8_1_LEADINGBIT)
+	{
+	  *count = 0;
+	  /* invalid */
+	  return 0;
+	}
+      else
+	{
+	  *code <<= 6;
+	  *code |= (c & GRUB_UINT8_6_TRAILINGBITS);
+	  (*count)--;
+	  /* Overlong.  */
+	  if ((*count == 1 && *code <= 0x1f)
+	      || (*count == 2 && *code <= 0xf))
+	    {
+	      *code = 0;
+	      *count = 0;
+	      return 0;
+	    }
+	  return 1;
+	}
+    }
+
+  if ((c & GRUB_UINT8_1_LEADINGBIT) == 0)
+    {
+      *code = c;
+      return 1;
+    }
+  if ((c & GRUB_UINT8_3_LEADINGBITS) == GRUB_UINT8_2_LEADINGBITS)
+    {
+      *count = 1;
+      *code = c & GRUB_UINT8_5_TRAILINGBITS;
+      /* Overlong */
+      if (*code <= 1)
+	{
+	  *count = 0;
+	  *code = 0;
+	  return 0;
+	}
+      return 1;
+    }
+  if ((c & GRUB_UINT8_4_LEADINGBITS) == GRUB_UINT8_3_LEADINGBITS)
+    {
+      *count = 2;
+      *code = c & GRUB_UINT8_4_TRAILINGBITS;
+      return 1;
+    }
+  if ((c & GRUB_UINT8_5_LEADINGBITS) == GRUB_UINT8_4_LEADINGBITS)
+    {
+      *count = 3;
+      *code = c & GRUB_UINT8_3_TRAILINGBITS;
+      return 1;
+    }
+  return 0;
+}
+
+
+/* Convert a (possibly null-terminated) UTF-8 string of at most SRCSIZE
+   bytes (if SRCSIZE is -1, it is ignored) in length to a UTF-16 string.
+   Return the number of characters converted. DEST must be able to hold
+   at least DESTSIZE characters. If an invalid sequence is found, return -1.
+   If SRCEND is not NULL, then *SRCEND is set to the next byte after the
+   last byte used in SRC.  */
+static inline grub_size_t
+grub_utf8_to_utf16 (grub_uint16_t *dest, grub_size_t destsize,
+		    const grub_uint8_t *src, grub_size_t srcsize,
+		    const grub_uint8_t **srcend)
+{
+  grub_uint16_t *p = dest;
+  int count = 0;
+  grub_uint32_t code = 0;
+
+  if (srcend)
+    *srcend = src;
+
+  while (srcsize && destsize)
+    {
+      int was_count = count;
+      if (srcsize != (grub_size_t)-1)
+	srcsize--;
+      if (!grub_utf8_process (*src++, &code, &count))
+	{
+	  code = '?';
+	  count = 0;
+	  /* Character c may be valid, don't eat it.  */
+	  if (was_count)
+	    src--;
+	}
+      if (count != 0)
+	continue;
+      if (code == 0)
+	break;
+      if (destsize < 2 && code >= GRUB_UCS2_LIMIT)
+	break;
+      if (code >= GRUB_UCS2_LIMIT)
+	{
+	  *p++ = GRUB_UTF16_UPPER_SURROGATE (code);
+	  *p++ = GRUB_UTF16_LOWER_SURROGATE (code);
+	  destsize -= 2;
+	}
+      else
+	{
+	  *p++ = code;
+	  destsize--;
+	}
+    }
+
+  if (srcend)
+    *srcend = src;
+  return p - dest;
+}
+
+/* Determine the last position where the UTF-8 string [beg, end) can
+   be safely cut. */
+static inline grub_size_t
+grub_getend (const char *beg, const char *end)
+{
+  const char *ptr;
+  for (ptr = end - 1; ptr >= beg; ptr--)
+    if ((*ptr & GRUB_UINT8_2_LEADINGBITS) != GRUB_UINT8_1_LEADINGBIT)
+      break;
+  if (ptr < beg)
+    return 0;
+  if ((*ptr & GRUB_UINT8_1_LEADINGBIT) == 0)
+    return ptr + 1 - beg;
+  if ((*ptr & GRUB_UINT8_3_LEADINGBITS) == GRUB_UINT8_2_LEADINGBITS
+      && ptr + 2 <= end)
+    return ptr + 2 - beg;
+  if ((*ptr & GRUB_UINT8_4_LEADINGBITS) == GRUB_UINT8_3_LEADINGBITS
+      && ptr + 3 <= end)
+    return ptr + 3 - beg;
+  if ((*ptr & GRUB_UINT8_5_LEADINGBITS) == GRUB_UINT8_4_LEADINGBITS
+      && ptr + 4 <= end)
+    return ptr + 4 - beg;
+  /* Invalid character or incomplete. Cut before it.  */
+  return ptr - beg;
+}
+
+/* Convert UTF-16 to UTF-8.  */
+static inline grub_uint8_t *
+grub_utf16_to_utf8 (grub_uint8_t *dest, const grub_uint16_t *src,
+		    grub_size_t size)
+{
+  grub_uint32_t code_high = 0;
+
+  while (size--)
+    {
+      grub_uint32_t code = *src++;
+
+      if (code_high)
+	{
+	  if (code >= 0xDC00 && code <= 0xDFFF)
+	    {
+	      /* Surrogate pair.  */
+	      code = ((code_high - 0xD800) << 10) + (code - 0xDC00) + 0x10000;
+
+	      *dest++ = (code >> 18) | 0xF0;
+	      *dest++ = ((code >> 12) & 0x3F) | 0x80;
+	      *dest++ = ((code >> 6) & 0x3F) | 0x80;
+	      *dest++ = (code & 0x3F) | 0x80;
+	    }
+	  else
+	    {
+	      /* Error...  */
+	      *dest++ = '?';
+	      /* *src may be valid. Don't eat it.  */
+	      src--;
+	    }
+
+	  code_high = 0;
+	}
+      else
+	{
+	  if (code <= 0x007F)
+	    *dest++ = code;
+	  else if (code <= 0x07FF)
+	    {
+	      *dest++ = (code >> 6) | 0xC0;
+	      *dest++ = (code & 0x3F) | 0x80;
+	    }
+	  else if (code >= 0xD800 && code <= 0xDBFF)
+	    {
+	      code_high = code;
+	      continue;
+	    }
+	  else if (code >= 0xDC00 && code <= 0xDFFF)
+	    {
+	      /* Error... */
+	      *dest++ = '?';
+	    }
+	  else if (code < 0x10000)
+	    {
+	      *dest++ = (code >> 12) | 0xE0;
+	      *dest++ = ((code >> 6) & 0x3F) | 0x80;
+	      *dest++ = (code & 0x3F) | 0x80;
+	    }
+	  else
+	    {
+	      *dest++ = (code >> 18) | 0xF0;
+	      *dest++ = ((code >> 12) & 0x3F) | 0x80;
+	      *dest++ = ((code >> 6) & 0x3F) | 0x80;
+	      *dest++ = (code & 0x3F) | 0x80;
+	    }
+	}
+    }
+
+  return dest;
+}
+
+#define GRUB_MAX_UTF8_PER_LATIN1 2
+
+/* Convert Latin1 to UTF-8.  */
+static inline grub_uint8_t *
+grub_latin1_to_utf8 (grub_uint8_t *dest, const grub_uint8_t *src,
+		     grub_size_t size)
+{
+  while (size--)
+    {
+      if (!(*src & 0x80))
+	*dest++ = *src;
+      else
+	{
+	  *dest++ = (*src >> 6) | 0xC0;
+	  *dest++ = (*src & 0x3F) | 0x80;
+	}
+      src++;
+    }
+
+  return dest;
+}
+
+/* Convert UCS-4 to UTF-8.  */
+char *grub_ucs4_to_utf8_alloc (const grub_uint32_t *src, grub_size_t size);
+
+int
+grub_is_valid_utf8 (const grub_uint8_t *src, grub_size_t srcsize);
+
+grub_ssize_t grub_utf8_to_ucs4_alloc (const char *msg,
+				      grub_uint32_t **unicode_msg,
+				      grub_uint32_t **last_position);
+
+/* Returns the number of bytes the string src would occupy is converted
+   to UTF-8, excluding \0.  */
+grub_size_t
+grub_get_num_of_utf8_bytes (const grub_uint32_t *src, grub_size_t size);
+
+/* Converts UCS-4 to UTF-8. Returns the number of bytes effectively written
+   excluding the trailing \0.  */
+grub_size_t
+grub_ucs4_to_utf8 (const grub_uint32_t *src, grub_size_t size,
+		   grub_uint8_t *dest, grub_size_t destsize);
+grub_size_t grub_utf8_to_ucs4 (grub_uint32_t *dest, grub_size_t destsize,
+			       const grub_uint8_t *src, grub_size_t srcsize,
+			       const grub_uint8_t **srcend);
+/* Returns -2 if not enough space, -1 on invalid character.  */
+grub_ssize_t
+grub_encode_utf8_character (grub_uint8_t *dest, grub_uint8_t *destend,
+			    grub_uint32_t code);
+
+const grub_uint32_t *
+grub_unicode_get_comb_start (const grub_uint32_t *str, 
+			     const grub_uint32_t *cur);
+
+int
+grub_utf8_get_num_code (const char *src, grub_size_t srcsize);
+
+const char *
+grub_utf8_offset_code (const char *src, grub_size_t srcsize, int num);
+
+#endif

GRUB2/MOD_SRC/grub-2.04/include/grub/gfxmenu_view.h

+/* gfxmenu_view.h - gfxmenu view interface. */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2008,2009  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_GFXMENU_VIEW_HEADER
+#define GRUB_GFXMENU_VIEW_HEADER 1
+
+#include <grub/types.h>
+#include <grub/err.h>
+#include <grub/menu.h>
+#include <grub/font.h>
+#include <grub/gfxwidgets.h>
+
+struct grub_gfxmenu_view;   /* Forward declaration of opaque type.  */
+typedef struct grub_gfxmenu_view *grub_gfxmenu_view_t;
+
+
+grub_gfxmenu_view_t grub_gfxmenu_view_new (const char *theme_path,
+					   int width, int height);
+
+void grub_gfxmenu_view_destroy (grub_gfxmenu_view_t view);
+
+/* Set properties on the view based on settings from the specified
+   theme file.  */
+grub_err_t grub_gfxmenu_view_load_theme (grub_gfxmenu_view_t view,
+                                         const char *theme_path);
+
+grub_err_t grub_gui_recreate_box (grub_gfxmenu_box_t *boxptr,
+                                  const char *pattern, const char *theme_dir);
+
+void grub_gfxmenu_view_draw (grub_gfxmenu_view_t view);
+
+void
+grub_gfxmenu_redraw_menu (grub_gfxmenu_view_t view);
+
+void
+grub_gfxmenu_redraw_timeout (grub_gfxmenu_view_t view);
+
+void
+grub_gfxmenu_view_redraw (grub_gfxmenu_view_t view,
+			  const grub_video_rect_t *region);
+
+void 
+grub_gfxmenu_clear_timeout (void *data);
+void 
+grub_gfxmenu_print_timeout (int timeout, void *data);
+void
+grub_gfxmenu_set_chosen_entry (int entry, void *data);
+void
+grub_gfxmenu_scroll_chosen_entry (void *data, int diren);
+
+grub_err_t grub_font_draw_string (const char *str,
+				  grub_font_t font,
+				  grub_video_color_t color,
+				  int left_x, int baseline_y);
+int grub_font_get_string_width (grub_font_t font,
+				const char *str);
+
+
+/* Implementation details -- this should not be used outside of the
+   view itself.  */
+
+#include <grub/video.h>
+#include <grub/bitmap.h>
+#include <grub/bitmap_scale.h>
+#include <grub/gui.h>
+#include <grub/gfxwidgets.h>
+#include <grub/icon_manager.h>
+
+/* Definition of the private representation of the view.  */
+struct grub_gfxmenu_view
+{
+  grub_video_rect_t screen;
+
+  int need_to_check_sanity;
+  grub_video_rect_t terminal_rect;
+  int terminal_border;
+
+  grub_font_t title_font;
+  grub_font_t message_font;
+  char *terminal_font_name;
+  grub_video_rgba_color_t title_color;
+  grub_video_rgba_color_t message_color;
+  grub_video_rgba_color_t message_bg_color;
+  struct grub_video_bitmap *raw_desktop_image;
+  struct grub_video_bitmap *scaled_desktop_image;
+  grub_video_bitmap_selection_method_t desktop_image_scale_method;
+  grub_video_bitmap_h_align_t desktop_image_h_align;
+  grub_video_bitmap_v_align_t desktop_image_v_align;
+  grub_video_rgba_color_t desktop_color;
+  grub_gfxmenu_box_t terminal_box;
+  char *title_text;
+  char *progress_message_text;
+  char *theme_path;
+
+  grub_gui_container_t canvas;
+
+  int double_repaint;
+
+  int selected;
+
+  grub_video_rect_t progress_message_frame;
+
+  grub_menu_t menu;
+
+  int nested;
+
+  int first_timeout;
+
+  int *menu_title_offset;
+};
+
+#endif /* ! GRUB_GFXMENU_VIEW_HEADER */

GRUB2/MOD_SRC/grub-2.04/include/grub/menu_viewer.h

+/* menu_viewer.h - Interface to menu viewer implementations. */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2009  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_MENU_VIEWER_HEADER
+#define GRUB_MENU_VIEWER_HEADER 1
+
+#include <grub/err.h>
+#include <grub/symbol.h>
+#include <grub/types.h>
+#include <grub/menu.h>
+#include <grub/term.h>
+
+struct grub_menu_viewer
+{
+  struct grub_menu_viewer *next;
+  void *data;
+  void (*set_chosen_entry) (int entry, void *data);
+  void (*scroll_chosen_entry) (void *data, int diren);
+  void (*print_timeout) (int timeout, void *data);
+  void (*clear_timeout) (void *data);
+  void (*fini) (void *fini);
+};
+
+void grub_menu_register_viewer (struct grub_menu_viewer *viewer);
+
+grub_err_t
+grub_menu_try_text (struct grub_term_output *term, 
+		    int entry, grub_menu_t menu, int nested);
+
+extern grub_err_t (*grub_gfxmenu_try_hook) (int entry, grub_menu_t menu,
+					    int nested);
+
+#endif /* GRUB_MENU_VIEWER_HEADER */