Squashed 'third_party/git/' content from commit cb71568594

git-subtree-dir: third_party/git
git-subtree-split: cb715685942260375e1eb8153b0768a376e4ece7

1 files changed, 309 insertions, 0 deletions

diff --git a/progress.c b/progress.c
new file mode 100644
index 000000000000..277db8afa26d
--- /dev/null
+++ b/progress.c
@@ -0,0 +1,309 @@
+/*
+ * Simple text-based progress display module for GIT
+ *
+ * Copyright (c) 2007 by Nicolas Pitre <nico@fluxnic.net>
+ *
+ * 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 "cache.h"
+#include "gettext.h"
+#include "progress.h"
+#include "strbuf.h"
+#include "trace.h"
+#include "utf8.h"
+
+#define TP_IDX_MAX      8
+
+struct throughput {
+	off_t curr_total;
+	off_t prev_total;
+	uint64_t prev_ns;
+	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;
+	struct strbuf display;
+};
+
+struct progress {
+	const char *title;
+	uint64_t last_value;
+	uint64_t total;
+	unsigned last_percent;
+	unsigned delay;
+	unsigned sparse;
+	struct throughput *throughput;
+	uint64_t start_ns;
+	struct strbuf counters_sb;
+	int title_len;
+	int split;
+};
+
+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 is_foreground_fd(int fd)
+{
+	int tpgrp = tcgetpgrp(fd);
+	return tpgrp < 0 || tpgrp == getpgid(0);
+}
+
+static void display(struct progress *progress, uint64_t n, const char *done)
+{
+	const char *tp;
+	struct strbuf *counters_sb = &progress->counters_sb;
+	int show_update = 0;
+
+	if (progress->delay && (!progress_update || --progress->delay))
+		return;
+
+	progress->last_value = n;
+	tp = (progress->throughput) ? progress->throughput->display.buf : "";
+	if (progress->total) {
+		unsigned percent = n * 100 / progress->total;
+		if (percent != progress->last_percent || progress_update) {
+			progress->last_percent = percent;
+
+			strbuf_reset(counters_sb);
+			strbuf_addf(counters_sb,
+				    "%3u%% (%"PRIuMAX"/%"PRIuMAX")%s", percent,
+				    (uintmax_t)n, (uintmax_t)progress->total,
+				    tp);
+			show_update = 1;
+		}
+	} else if (progress_update) {
+		strbuf_reset(counters_sb);
+		strbuf_addf(counters_sb, "%"PRIuMAX"%s", (uintmax_t)n, tp);
+		show_update = 1;
+	}
+
+	if (show_update) {
+		if (is_foreground_fd(fileno(stderr)) || done) {
+			const char *eol = done ? done : "\r";
+
+			term_clear_line();
+			if (progress->split) {
+				fprintf(stderr, "  %s%s", counters_sb->buf,
+					eol);
+			} else if (!done &&
+				   /* The "+ 2" accounts for the ": ". */
+				   term_columns() < progress->title_len +
+						    counters_sb->len + 2) {
+				fprintf(stderr, "%s:\n  %s%s",
+					progress->title, counters_sb->buf, eol);
+				progress->split = 1;
+			} else {
+				fprintf(stderr, "%s: %s%s", progress->title,
+					counters_sb->buf, eol);
+			}
+			fflush(stderr);
+		}
+		progress_update = 0;
+	}
+}
+
+static void throughput_string(struct strbuf *buf, uint64_t total,
+			      unsigned int rate)
+{
+	strbuf_reset(buf);
+	strbuf_addstr(buf, ", ");
+	strbuf_humanise_bytes(buf, total);
+	strbuf_addstr(buf, " | ");
+	strbuf_humanise_rate(buf, rate * 1024);
+}
+
+void display_throughput(struct progress *progress, uint64_t total)
+{
+	struct throughput *tp;
+	uint64_t now_ns;
+	unsigned int misecs, count, rate;
+
+	if (!progress)
+		return;
+	tp = progress->throughput;
+
+	now_ns = getnanotime();
+
+	if (!tp) {
+		progress->throughput = tp = xcalloc(1, sizeof(*tp));
+		tp->prev_total = tp->curr_total = total;
+		tp->prev_ns = now_ns;
+		strbuf_init(&tp->display, 0);
+		return;
+	}
+	tp->curr_total = total;
+
+	/* only update throughput every 0.5 s */
+	if (now_ns - tp->prev_ns <= 500000000)
+		return;
+
+	/*
+	 * We have x = bytes and y = nanosecs.  We want z = KiB/s:
+	 *
+	 *	z = (x / 1024) / (y / 1000000000)
+	 *	z = x / y * 1000000000 / 1024
+	 *	z = x / (y * 1024 / 1000000000)
+	 *	z = x / y'
+	 *
+	 * To simplify things we'll keep track of misecs, or 1024th of a sec
+	 * obtained with:
+	 *
+	 *	y' = y * 1024 / 1000000000
+	 *	y' = y * (2^10 / 2^42) * (2^42 / 1000000000)
+	 *	y' = y / 2^32 * 4398
+	 *	y' = (y * 4398) >> 32
+	 */
+	misecs = ((now_ns - tp->prev_ns) * 4398) >> 32;
+
+	count = total - tp->prev_total;
+	tp->prev_total = total;
+	tp->prev_ns = now_ns;
+	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->display, total, rate);
+	if (progress->last_value != -1 && progress_update)
+		display(progress, progress->last_value, NULL);
+}
+
+void display_progress(struct progress *progress, uint64_t n)
+{
+	if (progress)
+		display(progress, n, NULL);
+}
+
+static struct progress *start_progress_delay(const char *title, uint64_t total,
+					     unsigned delay, unsigned sparse)
+{
+	struct progress *progress = xmalloc(sizeof(*progress));
+	progress->title = title;
+	progress->total = total;
+	progress->last_value = -1;
+	progress->last_percent = -1;
+	progress->delay = delay;
+	progress->sparse = sparse;
+	progress->throughput = NULL;
+	progress->start_ns = getnanotime();
+	strbuf_init(&progress->counters_sb, 0);
+	progress->title_len = utf8_strwidth(title);
+	progress->split = 0;
+	set_progress_signal();
+	return progress;
+}
+
+struct progress *start_delayed_progress(const char *title, uint64_t total)
+{
+	return start_progress_delay(title, total, 2, 0);
+}
+
+struct progress *start_progress(const char *title, uint64_t total)
+{
+	return start_progress_delay(title, total, 0, 0);
+}
+
+/*
+ * Here "sparse" means that the caller might use some sampling criteria to
+ * decide when to call display_progress() rather than calling it for every
+ * integer value in[0 .. total).  In particular, the caller might not call
+ * display_progress() for the last value in the range.
+ *
+ * When "sparse" is set, stop_progress() will automatically force the done
+ * message to show 100%.
+ */
+struct progress *start_sparse_progress(const char *title, uint64_t total)
+{
+	return start_progress_delay(title, total, 0, 1);
+}
+
+struct progress *start_delayed_sparse_progress(const char *title,
+					       uint64_t total)
+{
+	return start_progress_delay(title, total, 2, 1);
+}
+
+static void finish_if_sparse(struct progress *progress)
+{
+	if (progress &&
+	    progress->sparse &&
+	    progress->last_value != progress->total)
+		display_progress(progress, progress->total);
+}
+
+void stop_progress(struct progress **p_progress)
+{
+	finish_if_sparse(*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;
+		struct throughput *tp = progress->throughput;
+
+		if (tp) {
+			uint64_t now_ns = getnanotime();
+			unsigned int misecs, rate;
+			misecs = ((now_ns - progress->start_ns) * 4398) >> 32;
+			rate = tp->curr_total / (misecs ? misecs : 1);
+			throughput_string(&tp->display, tp->curr_total, rate);
+		}
+		progress_update = 1;
+		buf = xstrfmt(", %s.\n", msg);
+		display(progress, progress->last_value, buf);
+		free(buf);
+	}
+	clear_progress_signal();
+	strbuf_release(&progress->counters_sb);
+	if (progress->throughput)
+		strbuf_release(&progress->throughput->display);
+	free(progress->throughput);
+	free(progress);
+}