nicer eye candies for pack-objects

This provides a stable and simpler progress reporting mechanism that
updates progress as often as possible but accurately not updating more
than once a second.  The deltification phase is also made more
interesting to watch (since repacking a big repository and only seeing a
dot appear once every many seconds is rather boring and doesn't provide
much food for anticipation).

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/pack-objects.c b/pack-objects.c
index 0c9f4c9..5e1e14c 100644 (file)
--- a/pack-objects.c
+++ b/pack-objects.c
@@ -4,6 +4,7 @@
 #include "pack.h"
 #include "csum-file.h"
 #include <sys/time.h>
+#include <signal.h>
 
 static const char pack_usage[] = "git-pack-objects [-q] [--no-reuse-delta] [--non-empty] [--local] [--incremental] [--window=N] [--depth=N] {--stdout | base-name} < object-list";
 
@@ -661,17 +662,22 @@ static int try_delta(struct unpacked *cur, struct unpacked *old, unsigned max_de
        return 0;
 }
 
+static volatile int progress_update = 0;
+static void progress_interval(int signum)
+{
+       signal(SIGALRM, progress_interval);
+       progress_update = 1;
+}
+
 static void find_deltas(struct object_entry **list, int window, int depth)
 {
        int i, idx;
        unsigned int array_size = window * sizeof(struct unpacked);
        struct unpacked *array = xmalloc(array_size);
-       int eye_candy;
 
        memset(array, 0, array_size);
        i = nr_objects;
        idx = 0;
-       eye_candy = i - (nr_objects / 20);
 
        while (--i >= 0) {
                struct object_entry *entry = list[i];
@@ -680,9 +686,10 @@ static void find_deltas(struct object_entry **list, int window, int depth)
                char type[10];
                int j;
 
-               if (progress && i <= eye_candy) {
-                       eye_candy -= nr_objects / 20;
-                       fputc('.', stderr);
+               if (progress_update || i == 0) {
+                       fprintf(stderr, "Deltifying (%d %d%%)\r",
+                               nr_objects-i, (nr_objects-i) * 100/nr_objects);
+                       progress_update = 0;
                }
 
                if (entry->delta)
@@ -714,6 +721,9 @@ static void find_deltas(struct object_entry **list, int window, int depth)
                        idx = 0;
        }
 
+       if (progress)
+               fputc('\n', stderr);
+
        for (i = 0; i < window; ++i)
                free(array[i].data);
        free(array);
@@ -721,17 +731,10 @@ static void find_deltas(struct object_entry **list, int window, int depth)
 
 static void prepare_pack(int window, int depth)
 {
-       if (progress)
-               fprintf(stderr, "Packing %d objects", nr_objects);
        get_object_details();
-       if (progress)
-               fputc('.', stderr);
-
        sorted_by_type = create_sorted_list(type_size_sort);
        if (window && depth)
                find_deltas(sorted_by_type, window+1, depth);
-       if (progress)
-               fputc('\n', stderr);
        write_pack_file();
 }
 
@@ -796,10 +799,6 @@ int main(int argc, char **argv)
        int window = 10, depth = 10, pack_to_stdout = 0;
        struct object_entry **list;
        int i;
-       struct timeval prev_tv;
-       int eye_candy = 0;
-       int eye_candy_incr = 500;
-
 
        setup_git_directory();
 
@@ -856,30 +855,25 @@ int main(int argc, char **argv)
                usage(pack_usage);
 
        prepare_packed_git();
+
        if (progress) {
+               struct itimerval v;
+               v.it_interval.tv_sec = 1;
+               v.it_interval.tv_usec = 0;
+               v.it_value = v.it_interval;
+               signal(SIGALRM, progress_interval);
+               setitimer(ITIMER_REAL, &v, NULL);
                fprintf(stderr, "Generating pack...\n");
-               gettimeofday(&prev_tv, NULL);
        }
+
        while (fgets(line, sizeof(line), stdin) != NULL) {
                unsigned int hash;
                char *p;
                unsigned char sha1[20];
 
-               if (progress && (eye_candy <= nr_objects)) {
+               if (progress_update) {
                        fprintf(stderr, "Counting objects...%d\r", nr_objects);
-                       if (eye_candy && (50 <= eye_candy_incr)) {
-                               struct timeval tv;
-                               int time_diff;
-                               gettimeofday(&tv, NULL);
-                               time_diff = (tv.tv_sec - prev_tv.tv_sec);
-                               time_diff <<= 10;
-                               time_diff += (tv.tv_usec - prev_tv.tv_usec);
-                               if ((1 << 9) < time_diff)
-                                       eye_candy_incr += 50;
-                               else if (50 < eye_candy_incr)
-                                       eye_candy_incr -= 50;
-                       }
-                       eye_candy += eye_candy_incr;
+                       progress_update = 0;
                }
                if (get_sha1_hex(line, sha1))
                        die("expected sha1, got garbage:\n %s", line);