# Copyright (C) 2013, Eric Wong <normalperson@yhbt.net> and all contributors
# License: GPLv3 or later (https://www.gnu.org/licenses/gpl-3.0.txt)
require 'tempfile'
include Rake::DSL

gendocs = %w(NEWS NEWS.atom.xml)
task rsync_docs: gendocs do
  dest = ENV["RSYNC_DEST"] || "yahns.yhbt.net:/srv/yahns/"
  top = %w(INSTALL HACKING README COPYING)

  # git-set-file-times is distributed with rsync,
  # Also available at: http://yhbt.net/git-set-file-times
  # on Debian systems: /usr/share/doc/rsync/scripts/git-set-file-times.gz
  sh("git", "set-file-times", "Documentation", "examples", *top)

  do_gzip = lambda do |txt|
    gz = "#{txt}.gz"
    tmp = "#{gz}.#$$"
    sh("gzip --rsyncable -9 < #{txt} > #{tmp}")
    st = File.stat(txt)
    File.utime(st.atime, st.mtime, tmp) # make nginx gzip_static happy
    File.rename(tmp, gz)
    gz
  end

  files = `git ls-files Documentation/*.txt`.split(/\n/)
  files.concat(top)
  files.concat(gendocs)
  gzfiles = files.map { |txt| do_gzip.call(txt) }
  files.concat(gzfiles)

  sh("rsync --chmod=Fugo=r -av #{files.join(' ')} #{dest}")

  examples = `git ls-files examples`.split(/\n/)
  gzex = examples.map { |txt| do_gzip.call(txt) }
  examples.concat(gzex)

  sh("rsync --chmod=Fugo=r -av #{examples.join(' ')} #{dest}/examples/")
end

def tags
  timefmt = '%Y-%m-%dT%H:%M:%SZ'
  @tags ||= `git tag -l`.split(/\n/).map do |tag|
    if %r{\Av[\d\.]+} =~ tag
      header, subject, body = `git cat-file tag #{tag}`.split(/\n\n/, 3)
      header = header.split(/\n/)
      tagger = header.grep(/\Atagger /).first
      body ||= "initial"
      time = Time.at(tagger.split(/ /)[-2].to_i).utc
      {
        time_obj: time,
        time: time.strftime(timefmt),
        tagger_name: %r{^tagger ([^<]+)}.match(tagger)[1].strip,
        tagger_email: %r{<([^>]+)>}.match(tagger)[1].strip,
        id: `git rev-parse refs/tags/#{tag}`.chomp!,
        tag: tag,
        subject: subject,
        body: body,
      }
    end
  end.compact.sort { |a,b| b[:time] <=> a[:time] }
end

url_base = 'http://yahns.yhbt.net'
cgit_url = 'http://yhbt.net/yahns.git'
git_url = 'git://yhbt.net/yahns.git'
since = "v0.0.2"

desc 'prints news as an Atom feed'
task "NEWS.atom.xml" do
  require 'nokogiri'
  new_tags = tags[0,10]
  time = nil
  str = Nokogiri::XML::Builder.new do
    feed :xmlns => "http://www.w3.org/2005/Atom" do
      id! "#{url_base}/NEWS.atom.xml"
      title "yahns news"
      subtitle "sleepy, multi-threaded, non-blocking Ruby application server"
      link! :rel => 'alternate', :type => 'text/plain',
            :href => "#{url_base}/NEWS"
      updated(new_tags.empty? ? "1970-01-01T00:00:00Z" : new_tags.first[:time])
      new_tags.each do |tag|
        time ||= tag[:time_obj]
        entry do
          title tag[:subject]
          updated tag[:time]
          published tag[:time]
          author {
            name tag[:tagger_name]
            email tag[:tagger_email]
          }
          url = "#{cgit_url}/tag/?id=#{tag[:tag]}"
          link! :rel => "alternate", :type => "text/html", :href =>url
          id! url
          message_only = tag[:body].split(/\n.+\(\d+\):\n {6}/).first.strip
          content({:type =>:text}, message_only)
          content(:type =>:xhtml) { pre tag[:body] }
        end
      end
    end
  end.to_xml

  fp = Tempfile.new("NEWS.atom.xml", ".")
  fp.sync = true
  fp.write(str)
  fp.chmod 0644
  File.utime(time, time, fp.path) if time
  File.rename(fp.path, "NEWS.atom.xml")
  fp.close!
end

desc 'prints news as a text file'
task "NEWS" do
  fp = Tempfile.new("NEWS", ".")
  fp.sync = true
  time = nil
  tags.each do |tag|
    time ||= tag[:time_obj]
    line = tag[:subject] + " / " + tag[:time].gsub(/T.*/, '')
    fp.puts line
    fp.puts("-" * line.length)
    fp.puts
    fp.puts tag[:body] #.gsub(/^/m, "  ").gsub(/[ \t]+$/m, "")
    fp.puts
  end
  fp.write("Unreleased\n\n") unless fp.size > 0
  fp.puts "COPYRIGHT"
  fp.puts "---------"
  bdfl = 'Eric Wong <normalperson@yhbt.net>'
  fp.puts "Copyright (C) 2013, #{bdfl} and all contributors"
  fp.puts "License: GPLv3 or later (http://www.gnu.org/licenses/gpl-3.0.txt)"
  fp.chmod 0644
  File.utime(time, time, fp.path) if time
  File.rename(fp.path, "NEWS")
  fp.close!
end