Separate updated gems lists into sections in NEWS.md

Author: nobu

NEWS.md

@@ -19,14 +19,13 @@ Other changes are listed in the following sections. We also listed release
 history from the previous bundled version that is Ruby 3.4.0 if it has GitHub
 releases.
 
-The following bundled gems are promoted from default gems.
+### The following bundled gems are promoted from default gems.
 
-The following default gem is added.
+### The following default gem is added.
 
-The following default gems are updated.
+### The following default gems are updated.
 
-
-The following bundled gems are updated.
+### The following bundled gems are updated.
 
 ### RubyGems and Bundler
 

tool/update-NEWS-gemlist.rb

@@ -6,10 +6,10 @@
 
 update = ->(list, type, desc = "updated") do
   item = ->(mark = "* ") do
-    "The following #{type} gem#{list.size == 1 ? ' is' : 's are'} #{desc}.\n\n" +
+    "### The following #{type} gem#{list.size == 1 ? ' is' : 's are'} #{desc}.\n\n" +
       list.map {|g, v|"#{mark}#{g} #{v}\n"}.join("") + "\n"
   end
-  news.sub!(/^(?:\*( +))?The following #{type} gems? (?:are|is) #{desc}\.\n+(?:(?(1) \1)\*( *).*\n)*\n*/) do
+  news.sub!(/^(?:\*( +)|#+ *)?The following #{type} gems? (?:are|is) #{desc}\.\n+(?:(?(1) \1)\*( *).*\n)*\n*/) do
     item["#{$1&.<< " "}*#{$2 || ' '}"]
   end or news.sub!(/^## Stdlib updates(?:\n+The following.*(?:\n+( *\* *).*)*)*\n+\K/) do
     item[$1 || "* "]