From 11a8e301f4d8217c0f4f9f60860736d4daca8aa7 Mon Sep 17 00:00:00 2001
From: Andrea Mazzoleni <amadvance@gmail.com>
Date: Wed, 27 Jan 2016 20:39:00 +0100
Subject: [PATCH] Clear the screen before printing stats

---
 cmdline/mingw.c    | 22 ++++++++++++++++++++++
 cmdline/portable.h |  5 +++++
 cmdline/state.c    |  1 +
 cmdline/unix.c     |  6 ++++++
 4 files changed, 34 insertions(+)

diff --git a/cmdline/mingw.c b/cmdline/mingw.c
index 3139772c..e15b1e3a 100644
--- a/cmdline/mingw.c
+++ b/cmdline/mingw.c
@@ -271,6 +271,28 @@ void os_abort(void)
 	exit(EXIT_FAILURE);
 }
 
+void os_clear(void)
+{
+	HANDLE console;
+	CONSOLE_SCREEN_BUFFER_INFO screen;
+	COORD coord;
+	DWORD written;
+
+	/* get the console */
+	console = GetStdHandle(STD_OUTPUT_HANDLE);
+	if (console == INVALID_HANDLE_VALUE)
+		return;
+
+	/* get the screen size */
+	if (!GetConsoleScreenBufferInfo(console, &screen))
+		return;
+
+	/* fill the screen with spaces */
+	coord.X = 0;
+	coord.Y = 0;
+	FillConsoleOutputCharacterA(console, ' ', screen.dwSize.X * screen.dwSize.Y, coord, &written);
+}
+
 /**
  * Size in chars of conversion buffers for u8to16() and u16to8().
  */
diff --git a/cmdline/portable.h b/cmdline/portable.h
index 2540d3d4..5b820410 100644
--- a/cmdline/portable.h
+++ b/cmdline/portable.h
@@ -352,6 +352,11 @@ void os_done(void);
  */
 void os_abort(void) __noreturn;
 
+/**
+ * Clear the screen.
+ */
+void os_clear(void);
+
 /**
  * Log file.
  *
diff --git a/cmdline/state.c b/cmdline/state.c
index 61c940c4..57d7a9c0 100644
--- a/cmdline/state.c
+++ b/cmdline/state.c
@@ -4018,6 +4018,7 @@ int state_progress(struct snapraid_state* state, struct snapraid_io* io, block_o
 				out_eta = (countmax - countpos) * delta_time / (60 * delta_pos);
 
 			if (msg_level >= MSG_VERBOSE) {
+				os_clear();
 				state_usage_graph(state, io, state->progress_ptr, oldest);
 			}
 		}
diff --git a/cmdline/unix.c b/cmdline/unix.c
index d71243b6..b6681e42 100644
--- a/cmdline/unix.c
+++ b/cmdline/unix.c
@@ -1226,5 +1226,11 @@ void os_abort(void)
 }
 /* LCOV_EXCL_STOP */
 
+void os_clear(void)
+{
+	/* ANSI code for clear screen */
+	printf("\033[2J");
+}
+
 #endif