1 files changed, 258 insertions, 0 deletions
diff --git a/progress.c b/progress.c
new file mode 100644
index 0000000..d19f80c
--- /dev/null
+++ b/progress.c
@@ -0,0 +1,258 @@
+/*
+ * Simple text-based progress display module for GIT
+ *
+ * Copyright (c) 2007 by Nicolas Pitre <nico@cam.org>
+ *
+ * This code is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "git-compat-util.h"
+#include "progress.h"
+
+#define TP_IDX_MAX      8
+
+struct throughput {
+	off_t curr_total;
+	off_t prev_total;
+	struct timeval prev_tv;
+	unsigned int avg_bytes;
+	unsigned int avg_misecs;
+	unsigned int last_bytes[TP_IDX_MAX];
+	unsigned int last_misecs[TP_IDX_MAX];
+	unsigned int idx;
+	char display[32];
+};
+
+struct progress {
+	const char *title;
+	int last_value;
+	unsigned total;
+	unsigned last_percent;
+	unsigned delay;
+	unsigned delayed_percent_treshold;
+	struct throughput *throughput;
+};
+
+static volatile sig_atomic_t progress_update;
+
+static void progress_interval(int signum)
+{
+	progress_update = 1;
+}
+
+static void set_progress_signal(void)
+{
+	struct sigaction sa;
+	struct itimerval v;
+
+	progress_update = 0;
+
+	memset(&sa, 0, sizeof(sa));
+	sa.sa_handler = progress_interval;
+	sigemptyset(&sa.sa_mask);
+	sa.sa_flags = SA_RESTART;
+	sigaction(SIGALRM, &sa, NULL);
+
+	v.it_interval.tv_sec = 1;
+	v.it_interval.tv_usec = 0;
+	v.it_value = v.it_interval;
+	setitimer(ITIMER_REAL, &v, NULL);
+}
+
+static void clear_progress_signal(void)
+{
+	struct itimerval v = {{0,},};
+	setitimer(ITIMER_REAL, &v, NULL);
+	signal(SIGALRM, SIG_IGN);
+	progress_update = 0;
+}
+
+static int display(struct progress *progress, unsigned n, const char *done)
+{
+	const char *eol, *tp;
+
+	if (progress->delay) {
+		if (!progress_update || --progress->delay)
+			return 0;
+		if (progress->total) {
+			unsigned percent = n * 100 / progress->total;
+			if (percent > progress->delayed_percent_treshold) {
+				/* inhibit this progress report entirely */
+				clear_progress_signal();
+				progress->delay = -1;
+				progress->total = 0;
+				return 0;
+			}
+		}
+	}
+
+	progress->last_value = n;
+	tp = (progress->throughput) ? progress->throughput->display : "";
+	eol = done ? done : "   \r";
+	if (progress->total) {
+		unsigned percent = n * 100 / progress->total;
+		if (percent != progress->last_percent || progress_update) {
+			progress->last_percent = percent;
+			fprintf(stderr, "%s: %3u%% (%u/%u)%s%s",
+				progress->title, percent, n,
+				progress->total, tp, eol);
+			fflush(stderr);
+			progress_update = 0;
+			return 1;
+		}
+	} else if (progress_update) {
+		fprintf(stderr, "%s: %u%s%s", progress->title, n, tp, eol);
+		fflush(stderr);
+		progress_update = 0;
+		return 1;
+	}
+
+	return 0;
+}
+
+static void throughput_string(struct throughput *tp, off_t total,
+			      unsigned int rate)
+{
+	int l = sizeof(tp->display);
+	if (total > 1 << 30) {
+		l -= snprintf(tp->display, l, ", %u.%2.2u GiB",
+			      (int)(total >> 30),
+			      (int)(total & ((1 << 30) - 1)) / 10737419);
+	} else if (total > 1 << 20) {
+		l -= snprintf(tp->display, l, ", %u.%2.2u MiB",
+			      (int)(total >> 20),
+			      ((int)(total & ((1 << 20) - 1)) * 100) >> 20);
+	} else if (total > 1 << 10) {
+		l -= snprintf(tp->display, l, ", %u.%2.2u KiB",
+			      (int)(total >> 10),
+			      ((int)(total & ((1 << 10) - 1)) * 100) >> 10);
+	} else {
+		l -= snprintf(tp->display, l, ", %u bytes", (int)total);
+	}
+	if (rate)
+		snprintf(tp->display + sizeof(tp->display) - l, l,
+			 " | %u KiB/s", rate);
+}
+
+void display_throughput(struct progress *progress, off_t total)
+{
+	struct throughput *tp;
+	struct timeval tv;
+	unsigned int misecs;
+
+	if (!progress)
+		return;
+	tp = progress->throughput;
+
+	gettimeofday(&tv, NULL);
+
+	if (!tp) {
+		progress->throughput = tp = calloc(1, sizeof(*tp));
+		if (tp) {
+			tp->prev_total = tp->curr_total = total;
+			tp->prev_tv = tv;
+		}
+		return;
+	}
+	tp->curr_total = total;
+
+	/*
+	 * We have x = bytes and y = microsecs.  We want z = KiB/s:
+	 *
+	 *	z = (x / 1024) / (y / 1000000)
+	 *	z = x / y * 1000000 / 1024
+	 *	z = x / (y * 1024 / 1000000)
+	 *	z = x / y'
+	 *
+	 * To simplify things we'll keep track of misecs, or 1024th of a sec
+	 * obtained with:
+	 *
+	 *	y' = y * 1024 / 1000000
+	 *	y' = y / (1000000 / 1024)
+	 *	y' = y / 977
+	 */
+	misecs = (tv.tv_sec - tp->prev_tv.tv_sec) * 1024;
+	misecs += (int)(tv.tv_usec - tp->prev_tv.tv_usec) / 977;
+
+	if (misecs > 512) {
+		unsigned int count, rate;
+
+		count = total - tp->prev_total;
+		tp->prev_total = total;
+		tp->prev_tv = tv;
+		tp->avg_bytes += count;
+		tp->avg_misecs += misecs;
+		rate = tp->avg_bytes / tp->avg_misecs;
+		tp->avg_bytes -= tp->last_bytes[tp->idx];
+		tp->avg_misecs -= tp->last_misecs[tp->idx];
+		tp->last_bytes[tp->idx] = count;
+		tp->last_misecs[tp->idx] = misecs;
+		tp->idx = (tp->idx + 1) % TP_IDX_MAX;
+
+		throughput_string(tp, total, rate);
+		if (progress->last_value != -1 && progress_update)
+			display(progress, progress->last_value, NULL);
+	}
+}
+
+int display_progress(struct progress *progress, unsigned n)
+{
+	return progress ? display(progress, n, NULL) : 0;
+}
+
+struct progress *start_progress_delay(const char *title, unsigned total,
+				       unsigned percent_treshold, unsigned delay)
+{
+	struct progress *progress = malloc(sizeof(*progress));
+	if (!progress) {
+		/* unlikely, but here's a good fallback */
+		fprintf(stderr, "%s...\n", title);
+		fflush(stderr);
+		return NULL;
+	}
+	progress->title = title;
+	progress->total = total;
+	progress->last_value = -1;
+	progress->last_percent = -1;
+	progress->delayed_percent_treshold = percent_treshold;
+	progress->delay = delay;
+	progress->throughput = NULL;
+	set_progress_signal();
+	return progress;
+}
+
+struct progress *start_progress(const char *title, unsigned total)
+{
+	return start_progress_delay(title, total, 0, 0);
+}
+
+void stop_progress(struct progress **p_progress)
+{
+	stop_progress_msg(p_progress, "done");
+}
+
+void stop_progress_msg(struct progress **p_progress, const char *msg)
+{
+	struct progress *progress = *p_progress;
+	if (!progress)
+		return;
+	*p_progress = NULL;
+	if (progress->last_value != -1) {
+		/* Force the last update */
+		char buf[strlen(msg) + 5];
+		struct throughput *tp = progress->throughput;
+		if (tp) {
+			unsigned int rate = !tp->avg_misecs ? 0 :
+					tp->avg_bytes / tp->avg_misecs;
+			throughput_string(tp, tp->curr_total, rate);
+		}
+		progress_update = 1;
+		sprintf(buf, ", %s.\n", msg);
+		display(progress, progress->last_value, buf);
+	}
+	clear_progress_signal();
+	free(progress->throughput);
+	free(progress);
+}