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Make "git log --count" work like "git rev-list"

This is a ridiculous patch. And I understand entirely if nobody else
cares, because I don't think anybody else has ever even noticed.

It turns out that I still use "git rev-list" outside of some hard-core
scripting for one silly reason: the linux-next statistics are all
about non-merge commits, and so to do a rough comparison with
linux-next, I do

        git rev-list --count --no-merges v4.20..

to get an approximate idea of how much I've merged compared to what is
in linux-next.

(See also


for the graphical view of it all, even though it looks a bit odd right
now because of how linux-next wasn't being updated over the holidats
and right at the 4.19 release).

Anyway, I've occasionally thought to myself that I should just fix
"git log" to learn that too, so that I wouldn't have to type out "git
rev-list". Because "git log" does actually take the "--count"
argument, it just doesn't honor it.

This is that patch.

From e3bc5387404bcefbd86081fbc82a93fc5c9efa99 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date: Sat, 5 Jan 2019 14:39:41 -0800
Subject: [PATCH] git log: honor the '--count' argument

"git log" is really the human-facing useful command that long long ago
used to scripted around "git rev-list".

In fact, if you want to use the old scripting code, you can still
approximate "git log" with something like

   git rev-list --pretty HEAD | less

but you'd be silly to do that, since "git log" is clearly a much nicer
interface and is what people should use.

Except I find myself still occasionally using "git rev-list" simply
because "git log" doesn't do one odd little quirk: commit counting.

So if you want to count the number of non-merge commits since the last
kernel version, you'd have to do something like

   git rev-list --count --no-merges v4.20..

because while "git log" actually silently _accepts_ the "--count"
argument, it doesn't do anything about it.

This little patch copies the rev-list code for counting to "git log".

Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
 builtin/log.c | 11 +++++++++++
 log-tree.c    | 10 ++++++++++
 2 files changed, 21 insertions(+)

diff --git a/builtin/log.c b/builtin/log.c
index e8e51068bd..62bef62f8a 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -411,6 +411,17 @@ static int cmd_log_walk(struct rev_info *rev)
 	if (close_file)
+	if (rev->count) {
+		if (rev->left_right && rev->cherry_mark)
+			printf("%d\t%d\t%d\n", rev->count_left, rev->count_right, rev->count_same);
+		else if (rev->left_right)
+			printf("%d\t%d\n", rev->count_left, rev->count_right);
+		else if (rev->cherry_mark)
+			printf("%d\t%d\n", rev->count_left + rev->count_right, rev->count_same);
+		else
+			printf("%d\n", rev->count_left + rev->count_right);
+	}
 	if (rev->diffopt.output_format & DIFF_FORMAT_CHECKDIFF &&
 	    rev->diffopt.flags.check_failed) {
 		return 02;
diff --git a/log-tree.c b/log-tree.c
index 10680c139e..49ff485320 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -913,6 +913,16 @@ int log_tree_commit(struct rev_info *opt, struct commit *commit)
 	struct log_info log;
 	int shown, close_file = opt->diffopt.close_file;
+	if (opt->count) {
+		if (commit->object.flags & PATCHSAME)
+			opt->count_same++;
+		else if (commit->object.flags & SYMMETRIC_LEFT)
+			opt->count_left++;
+		else
+			opt->count_right++;
+		return 1;
+	}
 	log.commit = commit;
 	log.parent = NULL;
 	opt->loginfo = &log;