less(1) - add support for alternate scroll mode (xterm, DECSET 1007) http://www.greenwoodsoftware.com/less/

fix-for-alternate-scroll-mode.diff

diff -u less-457/opttbl.c less-457-alternate-scroll/opttbl.c
--- less-457/opttbl.c 2012-12-09 07:15:56.000000000 +0900
+++ less-457-alternate-scroll/opttbl.c	2013-03-23 20:05:50.000000000 +0900
@@ -44,6 +44,7 @@
 public int chopline;		/* Truncate displayed lines at screen width */
 public int no_init;		/* Disable sending ti/te termcap strings */
 public int no_keypad;		/* Disable sending ks/ke termcap strings */
+public int no_wheel;		/* Disable alternate wheel mode */
 public int twiddle;             /* Show tildes after EOF */
 public int show_attn;		/* Hilite first unread line */
 public int shift_count;		/* Number of positions to shift horizontally */
@@ -432,6 +433,14 @@
 			NULL
 		}
 	},
+	{ OLETTER_NONE, &keypad_optname,
+		BOOL|NO_TOGGLE, OPT_OFF, &no_wheel, NULL,
+		{
+			"Use alternate scroll mode",
+			"Don't use alternate scroll mode",
+			NULL
+		}
+	},
 	{ OLETTER_NONE, &oldbot_optname,
 		BOOL, OPT_OFF, &oldbot, NULL,
 		{
Binary files less-457/opttbl.o and less-457-alternate-scroll/opttbl.o differ
diff -u less-457/screen.c less-457-alternate-scroll/screen.c
--- less-457/screen.c	2012-12-09 07:15:55.000000000 +0900
+++ less-457-alternate-scroll/screen.c	2013-03-24 13:06:52.000000000 +0900
@@ -179,6 +179,8 @@
 	*sc_backspace,		/* Backspace cursor */
 	*sc_s_keypad,		/* Start keypad mode */
 	*sc_e_keypad,		/* End keypad mode */
+	*sc_s_wheel,		/* Start alternate scroll mode */
+	*sc_e_wheel,		/* End alternate scroll mode */
 	*sc_init,		/* Startup terminal initialization */
 	*sc_deinit;		/* Exit terminal de-initialization */
 #endif
@@ -227,6 +229,7 @@
 extern int swindow;
 extern int no_init;
 extern int no_keypad;
+extern int no_wheel;
 extern int sigs;
 extern int wscroll;
 extern int screen_trashed;
@@ -1207,6 +1210,9 @@
 	if (sc_e_keypad == NULL)
 		sc_e_keypad = "";
 		
+	sc_s_wheel = "\033[?1007h";
+	sc_e_wheel = "\033[?1007l";
+
 	sc_init = ltgetstr("ti", &sp);
 	if (sc_init == NULL)
 		sc_init = "";
@@ -1537,6 +1543,8 @@
 		tputs(sc_init, sc_height, putchr);
 	if (!no_keypad)
 		tputs(sc_s_keypad, sc_height, putchr);
+	if (!no_wheel)
+		tputs(sc_s_wheel, 1, putchr);
 	if (top_scroll) 
 	{
 		int i;
@@ -1571,6 +1579,8 @@
 	if (!init_done)
 		return;
 #if !MSDOS_COMPILER
+	if (!no_wheel)
+		tputs(sc_e_wheel, 1, putchr);
 	if (!no_keypad)
 		tputs(sc_e_keypad, sc_height, putchr);
 	if (!no_init)