Rename --eta-window to --average-rate-window, since that is what it does, and correct the behaviour of the final update so the final rate shown is the average rate across the whole transfer.

src/include/options.h

@@ -42,7 +42,7 @@ struct opts_s {           /* structure describing run-time options */
 	double delay_start;            /* delay before first display */
 	unsigned int watch_pid;	       /* process to watch fds of */
 	int watch_fd;		       /* fd to watch */
-	unsigned int eta_window;       /* time window in seconds for eta calculations */
+	unsigned int average_rate_window; /* time window in seconds for average rate calculations */
 	unsigned int width;            /* screen width */
 	unsigned int height;           /* screen height */
 	char *name;                    /* process name, if any */

src/include/pv.h

@@ -93,7 +93,7 @@ extern void pv_state_name_set(pvstate_t, const char *);
 extern void pv_state_format_string_set(pvstate_t, const char *);
 extern void pv_state_watch_pid_set(pvstate_t, unsigned int);
 extern void pv_state_watch_fd_set(pvstate_t, int);
-extern void pv_state_eta_window_set(pvstate_t, int);
+extern void pv_state_average_rate_window_set(pvstate_t, int);
 
 extern void pv_state_inputfiles(pvstate_t, int, const char **);
 

src/main/help.c

@@ -40,9 +40,9 @@ void display_help(void)
 		 N_("show data transfer rate counter")},
 		{"-a", "--average-rate", 0,
 		 N_("show data transfer average rate counter")},
-		{"-m", "--eta-window", N_("SEC"),
+		{"-m", "--average-rate-window", N_("SEC"),
 		 N_
-		 ("compute ETA based on rate over past SEC seconds (default 30s)")},
+		 ("compute average rate over past SEC seconds (default 30s)")},
 		{"-b", "--bytes", 0,
 		 N_("show number of bytes transferred")},
 		{"-T", "--buffer-percent", 0,

src/main/main.c

@@ -206,7 +206,7 @@ int main(int argc, char **argv)
 	pv_state_format_string_set(state, opts->format);
 	pv_state_watch_pid_set(state, opts->watch_pid);
 	pv_state_watch_fd_set(state, opts->watch_fd);
-	pv_state_eta_window_set(state, opts->eta_window);
+	pv_state_average_rate_window_set(state, opts->average_rate_window);
 
 	pv_state_set_format(state, opts->progress, opts->timer, opts->eta,
 			    opts->fineta, opts->rate, opts->average_rate,

src/main/options.c

@@ -82,7 +82,7 @@ opts_t opts_parse(int argc, char **argv)
 		{"remote", 1, NULL, (int) 'R'},
 		{"pidfile", 1, NULL, (int) 'P'},
 		{"watchfd", 1, NULL, (int) 'd'},
-		{"eta-window", 1, NULL, (int) 'm'},
+		{"average-rate-window", 1, NULL, (int) 'm'},
 		{NULL, 0, NULL, 0}
 	};
 	int option_index = 0;
@@ -124,7 +124,7 @@ opts_t opts_parse(int argc, char **argv)
 	opts->delay_start = 0;
 	opts->watch_pid = 0;
 	opts->watch_fd = -1;
-	opts->eta_window = 30;
+	opts->average_rate_window = 30;
 
 	do {
 #ifdef HAVE_GETOPT_LONG
@@ -341,7 +341,7 @@ opts_t opts_parse(int argc, char **argv)
 				      &(opts->watch_fd));
 			break;
 		case 'm':
-			opts->eta_window = pv_getnum_ui(optarg);
+			opts->average_rate_window = pv_getnum_ui(optarg);
 			break;
 		default:
 #ifdef HAVE_GETOPT_LONG

src/pv/display.c

@@ -542,6 +542,22 @@ static char *pv__format(pvstate_t state,
 	update_history_avg_rate(state, total_bytes, elapsed_sec, rate);
 	average_rate = state->current_avg_rate;
 
+	/*
+	 * If this is the final update at the end of the transfer, we
+	 * recalculate the rate - and the average rate - across the whole
+	 * period of the transfer.
+	 */
+	if (bytes_since_last < 0) {
+		/* Sanity check to avoid division by zero */
+		if (elapsed_sec < 0.000001)
+			elapsed_sec = 0.000001;
+		average_rate =
+		    (((long double) total_bytes) -
+		     ((long double) state->initial_offset)) /
+		    (long double) elapsed_sec;
+		rate = average_rate;
+	}
+
 	if (state->size <= 0) {
 		/*
 		 * If we don't know the total size of the incoming data,

src/pv/state.c

@@ -250,7 +250,7 @@ void pv_state_watch_fd_set(pvstate_t state, int val)
 	state->watch_fd = val;
 };
 
-void pv_state_eta_window_set(pvstate_t state, int val)
+void pv_state_average_rate_window_set(pvstate_t state, int val)
 {
 	if (val < 1)
 		val = 1;