commit-graph: split up close_reachable() progress output

Amend the progress output added in 7b0f229222 ("commit-graph write:
add progress output", 2018-09-17) so that the total numbers it reports
aren't higher than the total number of commits anymore. See [1] for a
bug report pointing that out.

When I added this I wasn't intending to provide an accurate count, but
just have some progress output to show the user the command wasn't
hanging[2]. But since we are showing numbers, let's make them
accurate. The progress descriptions were suggested by Derrick Stolee
in [3].

As noted in [2] we are unlikely to show anything except the "Expanding
reachable..." message even on fairly large repositories such as
linux.git. On a test repository I have with north of 7 million commits
all of these are displayed. Two of them don't show up for long, but as
noted in [5] future-proofing this for if the loops become more
expensive in the future makes sense.

1. https://public-inbox.org/git/20181010203738.GE23446@szeder.dev/
2. https://public-inbox.org/git/87pnwhea8y.fsf@evledraar.gmail.com/
3. https://public-inbox.org/git/f7a0cbee-863c-61d3-4959-5cec8b43c705@gmail.com/
4. https://public-inbox.org/git/20181015160545.GG19800@szeder.dev/
5. https://public-inbox.org/git/87murle8da.fsf@evledraar.gmail.com/

Reported-by: SZEDER Gábor <szeder.dev@gmail.com>
Helped-by: Derrick Stolee <stolee@gmail.com>
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/commit-graph.c b/commit-graph.c
index 2a24eb8b5a60bfbb66597b4b8dd113eeb0f4715f..7f3bb93b0a2510e3201142f979b454cd915185aa 100644 (file)
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -595,26 +595,29 @@ static void add_missing_parents(struct packed_oid_list *oids, struct commit *com
 
 static void close_reachable(struct packed_oid_list *oids, int report_progress)
 {
-       int i;
+       int i, j;
        struct commit *commit;
        struct progress *progress = NULL;
-       int j = 0;
 
        if (report_progress)
                progress = start_delayed_progress(
-                       _("Annotating commits in commit graph"), 0);
+                       _("Loading known commits in commit graph"), j = 0);
        for (i = 0; i < oids->nr; i++) {
                display_progress(progress, ++j);
                commit = lookup_commit(the_repository, &oids->list[i]);
                if (commit)
                        commit->object.flags |= UNINTERESTING;
        }
+       stop_progress(&progress);
 
        /*
         * As this loop runs, oids->nr may grow, but not more
         * than the number of missing commits in the reachable
         * closure.
         */
+       if (report_progress)
+               progress = start_delayed_progress(
+                       _("Expanding reachable commits in commit graph"), j = 0);
        for (i = 0; i < oids->nr; i++) {
                display_progress(progress, ++j);
                commit = lookup_commit(the_repository, &oids->list[i]);
@@ -622,7 +625,11 @@ static void close_reachable(struct packed_oid_list *oids, int report_progress)
                if (commit && !parse_commit(commit))
                        add_missing_parents(oids, commit);
        }
+       stop_progress(&progress);
 
+       if (report_progress)
+               progress = start_delayed_progress(
+                       _("Clearing commit marks in commit graph"), j = 0);
        for (i = 0; i < oids->nr; i++) {
                display_progress(progress, ++j);
                commit = lookup_commit(the_repository, &oids->list[i]);