1 files changed, 50 insertions, 0 deletions
diff --git a/tool/releng/gen-mail.rb b/tool/releng/gen-mail.rb
new file mode 100755
index 0000000000..b958a64e65
--- /dev/null
+++ b/tool/releng/gen-mail.rb
@@ -0,0 +1,50 @@
+#!/usr/bin/env ruby
+require "open-uri"
+require "yaml"
+
+lang = ARGV.shift
+unless lang
+  abort "usage: #$1 {en,ja} | pbcopy"
+end
+
+# Confirm current directory is www.ruby-lang.org's working directory
+def confirm_w_r_l_o_wd
+  File.foreach('.git/config') do |line|
+    return true if line.include?('git@github.com:ruby/www.ruby-lang.org.git')
+  end
+  abort "Run this script in www.ruby-lang.org's working directory"
+end
+confirm_w_r_l_o_wd
+
+releases = YAML.load_file('_data/releases.yml')
+
+url = "https://hackmd.io/@naruse/ruby-relnote-#{lang}/download"
+src = URI(url).read
+src.gsub!(/[ \t]+$/, "")
+src.sub!(/(?<!\n)\z/, "\n")
+src.sub!(/^breaks: false\n/, '')
+
+if /^\{% assign release = site.data.releases \| where: "version", "([^"]+)" \| first %\}/ =~ src
+  version = $1
+else
+  abort %[#{url} doesn't include `{% assign release = site.data.releases | where: "version", "<version>" | first %}`]
+end
+
+release = releases.find{|rel|rel['version'] == version}
+unless release
+  abort "#{version} is not found in '_data/releases.yml'"
+end
+
+src.gsub!(/^{% assign .*\n/, '')
+src.gsub!(/\{\{(.*?)\}\}/) do
+  var = $1.strip
+  case var
+  when /\Arelease\.(.*)/
+    val =  release.dig(*$1.split('.'))
+    raise "invalid variable '#{var}'" unless val
+  else
+    raise "unknown variable '#{var}'"
+  end
+  val
+end
+puts src