make struct progress an opaque type

This allows for better management of progress "object" existence,
as well as making the progress display implementation more independent
from its callers.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 27 insertions, 6 deletions

diff --git a/progress.c b/progress.c
index 7629e05..c342e39 100644
--- a/progress.c
+++ b/progress.c
@@ -1,6 +1,15 @@
 #include "git-compat-util.h"
 #include "progress.h"
 
+struct progress {
+	const char *title;
+	int last_value;
+	unsigned total;
+	unsigned last_percent;
+	unsigned delay;
+	unsigned delayed_percent_treshold;
+};
+
 static volatile sig_atomic_t progress_update;
 
 static void progress_interval(int signum)
@@ -76,12 +85,18 @@ static int display(struct progress *progress, unsigned n, int done)
 
 int display_progress(struct progress *progress, unsigned n)
 {
-	return display(progress, n, 0);
+	return progress ? display(progress, n, 0) : 0;
 }
 
-void start_progress_delay(struct progress *progress, const char *title,
-			  unsigned total, unsigned percent_treshold, unsigned delay)
+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);
+		return NULL;
+	}
 	progress->title = title;
 	progress->total = total;
 	progress->last_value = -1;
@@ -89,19 +104,25 @@ void start_progress_delay(struct progress *progress, const char *title,
 	progress->delayed_percent_treshold = percent_treshold;
 	progress->delay = delay;
 	set_progress_signal();
+	return progress;
 }
 
-void start_progress(struct progress *progress, const char *title, unsigned total)
+struct progress *start_progress(const char *title, unsigned total)
 {
-	start_progress_delay(progress, title, total, 0, 0);
+	return start_progress_delay(title, total, 0, 0);
 }
 
-void stop_progress(struct progress *progress)
+void stop_progress(struct progress **p_progress)
 {
+	struct progress *progress = *p_progress;
+	if (!progress)
+		return;
+	*p_progress = NULL;
 	if (progress->last_value != -1) {
 		/* Force the last update */
 		progress_update = 1;
 		display(progress, progress->last_value, 1);
 	}
 	clear_progress_signal();
+	free(progress);
 }