Quit-if-one-screen patch taken from less package in Fedora 24

less-444-Foption.v2.patch

From 21d56469fd4b4558d640ad82c78f2b9748341c11 Mon Sep 17 00:00:00 2001
From: "Vojtech Vitek (V-Teq)" <vvitek@redhat.com>
Date: Mon, 14 May 2012 17:31:20 +0200
Subject: [PATCH] Fix -F option behavior

Original patch written by Jindrich Novy <jnovy@redhat.com>.

Changes and improvements by Zdenek Prikryl <zprikryl@redhat.com>,
Vojtech Vitek <vvitek@redhat.com> and Colin Guthrie <colin@mageia.org>.
Jozef Mlich <jmlich@redhat.com>
---
diff -up ./less-466/forwback.c.Foption ./less-466/forwback.c
--- ./less-466/forwback.c.Foption	2014-08-24 02:46:52.000000000 +0200
+++ ./less-466/forwback.c	2014-09-18 13:54:28.804626580 +0200
@@ -440,3 +440,24 @@ get_back_scroll()
 		return (sc_height - 2);
 	return (10000); /* infinity */
 }
+
+
+/*
+ * Get line count of file up to the screen height + 1 char
+ */
+	public int
+get_line_count()
+{
+       int nlines = 0;
+       POSITION pos;
+
+       pos = ch_zero();
+
+       while (pos != NULL_POSITION && nlines <= sc_height)
+       {
+               pos = forw_line(pos);
+               nlines++;
+       }
+
+       return nlines;
+}
diff -up ./less-466/funcs.h.Foption ./less-466/funcs.h
--- ./less-466/funcs.h.Foption	2014-08-24 02:46:54.000000000 +0200
+++ ./less-466/funcs.h	2014-09-18 13:55:12.140010010 +0200
@@ -139,6 +139,7 @@
 	public void forward ();
 	public void backward ();
 	public int get_back_scroll ();
+	public int get_line_count ();
 	public void del_ifile ();
 	public IFILE next_ifile ();
 	public IFILE prev_ifile ();
diff -up ./less-466/main.c.Foption ./less-466/main.c
--- ./less-466/main.c.Foption	2014-08-24 02:46:51.000000000 +0200
+++ ./less-466/main.c	2014-09-18 14:03:12.868331522 +0200
@@ -54,8 +54,10 @@ static char consoleTitle[256];
 #endif
 
 extern int	less_is_more;
+public int     line_count;
 extern int	missing_cap;
 extern int	know_dumb;
+extern int	quit_if_one_screen;
 extern int	pr_type;
 
 
@@ -273,10 +275,27 @@ main(argc, argv)
 	{
 		if (edit_stdin())  /* Edit standard input */
 			quit(QUIT_ERROR);
+		if (quit_if_one_screen)
+			line_count = get_line_count();
+
 	} else 
 	{
 		if (edit_first())  /* Edit first valid file in cmd line */
 			quit(QUIT_ERROR);
+			/*
+			* In case that we have only one file and -F, have to get a line
+			* count fot init(). If the line count is less then a height of a term,
+			* the content of the file is printed out and then less quits. Otherwise
+			* -F can not be used
+			*/
+		if (quit_if_one_screen)
+		{
+			if (nifile() == 1)
+				line_count = get_line_count();
+			else /* In case more than one file, -F can not be used */
+				quit_if_one_screen = FALSE;
+		}
+
 	}
 
 	init();
diff -up ./less-466/screen.c.Foption ./less-466/screen.c
--- ./less-466/screen.c.Foption	2014-08-24 02:46:51.000000000 +0200
+++ ./less-466/screen.c	2014-09-18 13:58:52.772962165 +0200
@@ -203,6 +203,7 @@ public int missing_cap = 0;	/* Some capa
 
 static int attrmode = AT_NORMAL;
 extern int binattr;
+extern int line_count;
 
 #if !MSDOS_COMPILER
 static char *cheaper();
@@ -232,6 +233,7 @@ extern int wscroll;
 extern int screen_trashed;
 extern int tty;
 extern int top_scroll;
+extern int quit_if_one_screen;
 extern int oldbot;
 #if HILITE_SEARCH
 extern int hilite_search;
@@ -1533,7 +1535,9 @@ win32_deinit_term()
 init()
 {
 #if !MSDOS_COMPILER
-	if (!no_init)
+	if (quit_if_one_screen && line_count >= sc_height)
+		quit_if_one_screen = FALSE;
+	if (!no_init && !quit_if_one_screen)
 		tputs(sc_init, sc_height, putchr);
 	if (!no_keypad)
 		tputs(sc_s_keypad, sc_height, putchr);
@@ -1573,7 +1577,7 @@ deinit()
 #if !MSDOS_COMPILER
 	if (!no_keypad)
 		tputs(sc_e_keypad, sc_height, putchr);
-	if (!no_init)
+	if (!no_init && !quit_if_one_screen)
 		tputs(sc_deinit, sc_height, putchr);
 #else
 	/* Restore system colors. */