fel: support FEL progress gauge via dialog utility

This patch adds some additional commands, and implements corresponding
progress callbacks that produce output for the 'dialog' utility:
http://invisible-island.net/dialog/dialog.html

The simple "*-with-gauge" just emits percentage numbers, line by line,
while "*-with-xgauge" outputs extended information to update the
dialog prompt. Both are meant for directly piping the output:
sunxi-fel write-with-gauge <...> | dialog --gauge "FEL upload" 6 70

Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>
Acked-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>

fel.c

@@ -1299,8 +1299,13 @@ int main(int argc, char **argv)
 			"	read address length file	Write memory contents into file\n"
 			"	write address file		Store file contents into memory\n"
 			"	write-with-progress addr file	\"write\" with progress bar\n"
+			"	write-with-gauge addr file	Output progress for \"dialog --gauge\"\n"
+			"	write-with-xgauge addr file	Extended gauge output (updates prompt)\n"
 			"	multi[write] # addr file ...	\"write-with-progress\" multiple files,\n"
 			"					sharing a common progress status\n"
+			"	multi[write]-with-gauge ...	like their \"write-with-*\" counterpart,\n"
+			"	multi[write]-with-xgauge ...	  but following the 'multi' syntax:\n"
+			"					  <#> addr file [addr file [...]]\n"
 			"	ver[sion]			Show BROM version\n"
 			"	clear address length		Clear memory\n"
 			"	fill address length value	Fill memory\n"
@@ -1367,11 +1372,27 @@ int main(int argc, char **argv)
 		} else if (strcmp(argv[1], "write-with-progress") == 0 && argc > 3) {
 			skip += 2 * file_upload(handle, 1, argc - 2, argv + 2,
 						progress_bar);
+		} else if (strcmp(argv[1], "write-with-gauge") == 0 && argc > 3) {
+			skip += 2 * file_upload(handle, 1, argc - 2, argv + 2,
+						progress_gauge);
+		} else if (strcmp(argv[1], "write-with-xgauge") == 0 && argc > 3) {
+			skip += 2 * file_upload(handle, 1, argc - 2, argv + 2,
+						progress_gauge_xxx);
 		} else if ((strcmp(argv[1], "multiwrite") == 0 ||
 			    strcmp(argv[1], "multi") == 0) && argc > 4) {
 			size_t count = strtoul(argv[2], NULL, 0); /* file count */
 			skip = 2 + 2 * file_upload(handle, count, argc - 3,
 						   argv + 3, progress_bar);
+		} else if ((strcmp(argv[1], "multiwrite-with-gauge") == 0 ||
+			    strcmp(argv[1], "multi-with-gauge") == 0) && argc > 4) {
+			size_t count = strtoul(argv[2], NULL, 0); /* file count */
+			skip = 2 + 2 * file_upload(handle, count, argc - 3,
+						   argv + 3, progress_gauge);
+		} else if ((strcmp(argv[1], "multiwrite-with-xgauge") == 0 ||
+			    strcmp(argv[1], "multi-with-xgauge") == 0) && argc > 4) {
+			size_t count = strtoul(argv[2], NULL, 0); /* file count */
+			skip = 2 + 2 * file_upload(handle, count, argc - 3,
+						   argv + 3, progress_gauge_xxx);
 		} else if (strcmp(argv[1], "read") == 0 && argc > 4) {
 			size_t size = strtoul(argv[3], NULL, 0);
 			void *buf = malloc(size);

progress.c

@@ -119,3 +119,47 @@ void progress_bar(size_t total, size_t done)
 
 	fflush(stdout);
 }
+
+/*
+ * Progress callback that emits percentage numbers, each on a separate line.
+ * The output is suitable for piping it into "dialog --gauge".
+ *
+ * sunxi-fel multiwrite-with-gauge <...> \
+ *	| dialog --title "FEL upload progress" \
+ *		 --gauge "" 5 70
+ */
+void progress_gauge(size_t total, size_t done)
+{
+	if (total > 0) {
+		printf("%.0f\n", (float)done / total * 100);
+		fflush(stdout);
+	}
+}
+
+/*
+ * A more sophisticated version of progress_gauge() that also updates the
+ * prompt (caption) with additional information. This uses a feature of
+ * the dialog utility that parses "XXX" delimiters - see 'man dialog'.
+ *
+ * sunxi-fel multiwrite-with-xgauge <...> \
+ *	| dialog --title "FEL upload progress" \
+ *		 --backtitle "Please wait..." \
+ *		 --gauge "" 6 70
+ */
+void progress_gauge_xxx(size_t total, size_t done)
+{
+	if (total > 0) {
+		double speed = rate(done, progress_elapsed());
+		double eta = estimate(total - done, speed);
+		printf("XXX\n");
+		printf("%.0f\n", (float)done / total * 100);
+		if (done < total)
+			printf("%zu of %zu, %.1f kB/s, ETA %s\n",
+				done, total, kilo(speed), format_ETA(eta));
+		else
+			printf("Done: %.1f kB, at %.1f kB/s\n",
+				kilo(done), kilo(speed));
+		printf("XXX\n");
+		fflush(stdout);
+	}
+}

progress.h

@@ -35,5 +35,7 @@ void progress_update(size_t bytes_done);
 
 /* progress callback implementations for various display styles */
 void progress_bar(size_t total, size_t done);
+void progress_gauge(size_t total, size_t done);
+void progress_gauge_xxx(size_t total, size_t done);
 
 #endif /* _SUNXI_TOOLS_PROGRESS_H */