https://git.ruby-lang.org/ruby.git/commit/?id=474af9ee9a

From 474af9ee9a4804d052e1e40503e1b6491d00a969 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Wed, 1 May 2019 20:47:00 +0900
Subject: No last commit when up-to-date

Get the last commit title from the upstream to the head, so that
no `last_commit` line will be shown when the branch is up to date
with the upstream.

diff --git a/tool/vcs.rb b/tool/vcs.rb
index f4a10c8..f85b57e 100644
--- a/tool/vcs.rb
+++ b/tool/vcs.rb
@@ -402,7 +402,9 @@ class VCS https://github.com/ruby/ruby/blob/trunk/tool/vcs.rb#L402
       modified = log[/^Date:\s+(.*)/, 1]
       branch = cmd_read_at(srcdir, [gitcmd + %W[symbolic-ref --short HEAD]])
       branch.chomp!
-      title = cmd_read_at(srcdir, [gitcmd + %W[log --format=%s -n1 FETCH_HEAD..HEAD]])
+      upstream = cmd_read_at(srcdir, [gitcmd + %W[branch --list --format=%(upstream:short) #${branch}]])
+      upstream.chomp!
+      title = cmd_read_at(srcdir, [gitcmd + %W[log --format=%s -n1 #{upstream}..HEAD]])
       title = nil if title.empty?
       [last, changed, modified, branch, title]
     end
-- 
cgit v0.10.2


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