common.mk: update-man-date

* common.mk (update-man-date): update last date in man pages.

* tool/vcs.rb (VCS#modified): returns last modified time.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50614 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

common.mk

@@ -1023,6 +1023,12 @@ yes-test-all: sudo-precheck
 sudo-precheck: PHONY
 	@$(SUDO) echo > $(NULL)
 
+update-man-date: PHONY
+	-$(Q) $(BASERUBY) -I"$(srcdir)/tool" -rvcs -i -p \
+	-e 'BEGIN{@vcs=VCS.detect(ARGV.shift)}' \
+	-e '$$_.sub!(/^(\.Dd ).*/){$$1+@vcs.modified(ARGF.path).strftime("%B %d, %Y")}' \
+	"$(srcdir)" "$(srcdir)"/man/*.1
+
 help: PHONY
 	$(MESSAGE_BEGIN) \
 	"                Makefile of Ruby" \

tool/vcs.rb

@@ -130,6 +130,11 @@ class VCS
     return last, changed, modified, *rest
   end
 
+  def modified(path)
+    last, changed, modified, *rest = get_revisions(path)
+    modified
+  end
+
   def relative_to(path)
     if path
       srcdir = File.realpath(@srcdir)