Update newer version gems only

tool/update-bundled_gems.rb

@@ -10,26 +10,29 @@ END {
   output.print date.strftime("latest_date=%F") if date
 }
 unless /^[^#]/ !~ (gem = $F[0])
+  ver = Gem::Version.new($F[1])
   (gem, src), = Gem::SpecFetcher.fetcher.detect(:latest) {|s|
     s.platform == "ruby" && s.name == gem
   }
-  gem = src.fetch_spec(gem)
-  if ENV["UPDATE_BUNDLED_GEMS_ALL"]
-    uri = gem.metadata["source_code_uri"] || gem.homepage
-    uri = uri.sub(%r[\Ahttps://github\.com/[^/]+/[^/]+\K/tree/.*], "").chomp(".git")
-  else
-    uri = $F[2]
-  end
-  date = gem.date if !date or gem.date && gem.date > date
-  if $F[3]
-    if $F[3].include?($F[1])
-      $F[3][$F[1]] = gem.version.to_s
-    elsif Gem::Version.new($F[1]) != gem.version and /\A\h+\z/ =~ $F[3]
-      $F[3..-1] = []
+  if gem.version > ver
+    gem = src.fetch_spec(gem)
+    if ENV["UPDATE_BUNDLED_GEMS_ALL"]
+      uri = gem.metadata["source_code_uri"] || gem.homepage
+      uri = uri.sub(%r[\Ahttps://github\.com/[^/]+/[^/]+\K/tree/.*], "").chomp(".git")
+    else
+      uri = $F[2]
     end
+    date = gem.date if !date or gem.date && gem.date > date
+    if $F[3]
+      if $F[3].include?($F[1])
+        $F[3][$F[1]] = gem.version.to_s
+      elsif Gem::Version.new($F[1]) != gem.version and /\A\h+\z/ =~ $F[3]
+        $F[3..-1] = []
+      end
+    end
+    f = [gem.name, gem.version.to_s, uri, *$F[3..-1]]
+    $_.gsub!(/\S+\s*(?=\s|$)/) {|s| (f.shift || "").ljust(s.size)}
+    $_ = [$_, *f].join(" ") unless f.empty?
+    $_.rstrip!
   end
-  f = [gem.name, gem.version.to_s, uri, *$F[3..-1]]
-  $_.gsub!(/\S+\s*/) {|s| (f.shift || "").ljust(s.size)}
-  $_ = [$_, *f].join(" ") unless f.empty?
-  $_.rstrip!
 end