status: add advice on how to push/pull to tracking branch

Signed-off-by: Matthieu Moy <Matthieu.Moy@imag.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

remote.c

@@ -1627,21 +1627,25 @@ int format_tracking_info(struct branch *branch, struct strbuf *sb)
 
 	base = branch->merge[0]->dst;
 	base = shorten_unambiguous_ref(base, 0);
-	if (!num_theirs)
+	if (!num_theirs) {
 		strbuf_addf(sb,
 			Q_("Your branch is ahead of '%s' by %d commit.\n",
 			   "Your branch is ahead of '%s' by %d commits.\n",
 			   num_ours),
 			base, num_ours);
-	else if (!num_ours)
+		strbuf_addf(sb,
+			_("  (use \"git push\" to publish your local commits)\n"));
+	} else if (!num_ours) {
 		strbuf_addf(sb,
 			Q_("Your branch is behind '%s' by %d commit, "
 			       "and can be fast-forwarded.\n",
 			   "Your branch is behind '%s' by %d commits, "
 			       "and can be fast-forwarded.\n",
 			   num_theirs),
 			base, num_theirs);
-	else
+		strbuf_addf(sb,
+			_("  (use \"git pull\" to update your local branch)\n"));
+	} else {
 		strbuf_addf(sb,
 			Q_("Your branch and '%s' have diverged,\n"
 			       "and have %d and %d different commit each, "
@@ -1651,6 +1655,9 @@ int format_tracking_info(struct branch *branch, struct strbuf *sb)
 			       "respectively.\n",
 			   num_theirs),
 			base, num_ours, num_theirs);
+		strbuf_addf(sb,
+			_("  (use \"git pull\" to merge the remote branch into yours)\n"));
+	}
 	return 1;
 }
 

t/t2020-checkout-detach.sh

@@ -151,6 +151,7 @@ test_expect_success 'checkout does not warn leaving reachable commit' '
 
 cat >expect <<'EOF'
 Your branch is behind 'master' by 1 commit, and can be fast-forwarded.
+  (use "git pull" to update your local branch)
 EOF
 test_expect_success 'tracking count is accurate after orphan check' '
 	reset &&