[syslinux:master] menu: add MENU CLEAR option

[syslinux-bot for H. Peter Anvin]

Commit-ID:  cf31931a1afe86c9d3f0871d0ba82d1d788b4774
Gitweb:     http://syslinux.zytor.com/commit/cf31931a1afe86c9d3f0871d0ba82d1d788b4774
Author:     H. Peter Anvin <hpa at zytor.com>
AuthorDate: Wed, 3 Feb 2010 16:05:59 -0800
Committer:  H. Peter Anvin <hpa at zytor.com>
CommitDate: Wed, 3 Feb 2010 16:05:59 -0800

menu: add MENU CLEAR option

Add MENU CLEAR to clear the screen on menu exit.

Signed-off-by: H. Peter Anvin <hpa at zytor.com>


---
 com32/menu/menu.h       |    1 +
 com32/menu/menumain.c   |    3 +++
 com32/menu/readconfig.c |    5 ++++-
 doc/menu.txt            |    8 ++++++++
 4 files changed, 16 insertions(+), 1 deletions(-)

diff --git a/com32/menu/menu.h b/com32/menu/menu.h
index 52b4e4d..1e596e1 100644
--- a/com32/menu/menu.h
+++ b/com32/menu/menu.h
@@ -180,6 +180,7 @@ extern struct menu *root_menu, *start_menu, *hide_menu, *menu_list;
 /* These are global parameters regardless of which menu we're displaying */
 extern int shiftkey;
 extern int hiddenmenu;
+extern int clearmenu;
 extern long long totaltimeout;
 
 void parse_configs(char **argv);
diff --git a/com32/menu/menumain.c b/com32/menu/menumain.c
index 9516f72..0c39264 100644
--- a/com32/menu/menumain.c
+++ b/com32/menu/menumain.c
@@ -1130,6 +1130,9 @@ int main(int argc, char *argv[])
 	local_cursor_enable(true);
 	cmdline = run_menu();
 
+	if (clearmenu)
+	    clear_screen();
+
 	local_cursor_enable(false);
 	printf("\033[?25h\033[%d;1H\033[0m", END_ROW);
 
diff --git a/com32/menu/readconfig.c b/com32/menu/readconfig.c
index a248721..d4c8848 100644
--- a/com32/menu/readconfig.c
+++ b/com32/menu/readconfig.c
@@ -1,7 +1,7 @@
 /* ----------------------------------------------------------------------- *
  *
  *   Copyright 2004-2009 H. Peter Anvin - All Rights Reserved
- *   Copyright 2009 Intel Corporation; author: H. Peter Anvin
+ *   Copyright 2009-2010 Intel Corporation; author: H. Peter Anvin
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -34,6 +34,7 @@ struct menu *root_menu, *start_menu, *hide_menu, *menu_list;
 /* These are global parameters regardless of which menu we're displaying */
 int shiftkey = 0;		/* Only display menu if shift key pressed */
 int hiddenmenu = 0;
+int clearmenu = 0;
 long long totaltimeout = 0;
 
 /* Keep track of global default */
@@ -690,6 +691,8 @@ static void parse_config_file(FILE * f)
 		m->menu_background = refdup_word(&p);
 	    } else if ((ep = looking_at(p, "hidden"))) {
 		hiddenmenu = 1;
+	    } else if ((ep = looking_at(p, "clear"))) {
+		clearmenu = 1;
 	    } else if ((ep = is_message_name(p, &msgnr))) {
 		refstr_put(m->messages[msgnr]);
 		m->messages[msgnr] = refstrdup(skipspace(ep));
diff --git a/doc/menu.txt b/doc/menu.txt
index e160124..c912c1d 100644
--- a/doc/menu.txt
+++ b/doc/menu.txt
@@ -48,6 +48,14 @@ MENU HIDDEN
 	All that is displayed is a timeout message.
 
 
+MENU CLEAR
+
+	Clear the screen when exiting the menu, instead of leaving the
+	menu displayed.  For vesamenu, this means the graphical
+	background is still displayed without the menu itself for as
+	long as the screen remains in graphics mode.
+
+
 MENU SHIFTKEY
 
 	Exit the menu system immediately unless either the Shift or Alt