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#!/usr/bin/ruby -s
# -*- coding: us-ascii -*-
require 'uri'
require 'digest/md5'
require 'digest/sha2'
require 'fileutils'
require 'tmpdir'
STDOUT.sync = true

$exported = nil if $exported == ""
$archname = nil if $archname == ""

ENV["LC_ALL"] = ENV["LANG"] = "C"
SVNURL = URI.parse("http://svn.ruby-lang.org/repos/ruby/")
RUBY_VERSION_PATTERN = /^\#define\s+RUBY_VERSION\s+"([\d.]+)"/

ENV["VPATH"] ||= "include/ruby"
YACC = ENV["YACC"] ||= "bison"
ENV["BASERUBY"] ||= "ruby"
ENV["RUBY"] ||= "ruby"
ENV["MV"] ||= "mv"
ENV["MINIRUBY"] ||= "ruby"

class String
  # for older ruby
  alias bytesize size unless method_defined?(:bytesize)
end

$patch_file &&= File.expand_path($patch_file)
path = ENV["PATH"].split(File::PATH_SEPARATOR)
%w[YACC BASERUBY RUBY MV MINIRUBY].each do |var|
  cmd = ENV[var]
  unless path.any? {|dir|
      file = File.expand_path(cmd, dir)
      File.file?(file) and File.executable?(file)
    }
    abort "#{File.basename $0}: #{var} command not found - #{cmd}"
  end
end

unless destdir = ARGV.shift
  abort "usage: #{File.basename $0} new-directory-to-save [version ...]"
end
revisions = ARGV.empty? ? ["trunk"] : ARGV
unless tmp = $exported
  FileUtils.mkpath(destdir)
  destdir = File.expand_path(destdir)
  tmp = Dir.mktmpdir("ruby-snapshot")
  FileUtils.mkpath(tmp)
  at_exit {
    Dir.chdir "/"
    FileUtils.rm_rf(tmp)
  } unless $keep_temp
end
Dir.chdir tmp

def package(rev, destdir)
  patchlevel = false
  case rev
  when /\Atrunk\z/, /\Abranches\//, /\Atags\//
    url = SVNURL + rev
  when /\Astable\z/
    url = SVNURL + "branches/"
    url = url + `svn ls #{url}`[/.*^(ruby_\d+_\d+)\//m, 1]
  when /\A(.*)\.(.*)\.(.*)-((?!preview)p)?(.*)/
    patchlevel = !!$4
    tag = "#{$4}#{$5}"
    url = SVNURL + "tags/v#{$1}_#{$2}_#{$3}_#{$5}"
  when /\./
    url = SVNURL + "branches/ruby_#{rev.tr('.', '_')}"
  else
    warn "#{$0}: unknown version - #{rev}"
    return
  end
  revision = `svn info #{url} 2>&1`[/Last Changed Rev: (\d+)/, 1]
  version = nil
  unless revision
    url = SVNURL + "trunk"
    version = `svn cat #{url + "version.h"}`[RUBY_VERSION_PATTERN, 1]
    unless rev == version
      warn "#{$0}: #{rev} not found"
      return
    end
    revision = `svn info #{url}`[/Last Changed Rev: (\d+)/, 1]
  end
  v = nil
  if $exported
    if String === $exported
      v = $exported
    end
  else
    v = "ruby"
    puts "Exporting #{rev}@#{revision}"
    IO.popen("svn export #{url} #{v}") do |pipe|
      pipe.each {|line| /^A/ =~ line or print line}
    end
    unless $?.success?
      warn("Export failed")
      return
    end
  end

  if !File.directory?(v)
    v = Dir.glob("ruby-*").select(&File.method(:directory?))
    v.size == 1 or abort "not exported"
    v = v[0]
  end
  open("#{v}/revision.h", "wb") {|f| f.puts "#define RUBY_REVISION #{revision}"}
  version ||= (versionhdr = IO.read("#{v}/version.h"))[RUBY_VERSION_PATTERN, 1]
  version or return
  if patchlevel
    versionhdr ||= IO.read("#{v}/version.h")
    patchlevel = versionhdr[/^\#define\s+RUBY_PATCHLEVEL\s+(\d+)/, 1]
    tag = (patchlevel ? "p#{patchlevel}" : "r#{revision}")
  else
    tag ||= "r#{revision}"
  end
  unless v == $exported
    n = "ruby-#{version}-#{tag}"
    File.directory?(n) or File.rename v, n
    v = n
  end
  system("patch -d #{v} -p0 -i #{$patch_file}") if $patch_file
  def (clean = []).add(n) push(n); n end
  Dir.chdir(v) do
    File.open(clean.add("cross.rb"), "w") {|f| f.puts "CROSS_COMPILING=true"}
    unless File.exist?("configure")
      print "creating configure..."
      unless system("autoconf")
        puts " failed"
        return
      end
      puts " done"
    end
    clean.add("autom4te.cache")
    print "creating prerequisites..."
    if File.file?("common.mk") && /^prereq/ =~ commonmk = IO.read("common.mk")
      puts
      extout = clean.add('tmp')
      File.open(clean.add("config.status"), "w") {|f|
        f.puts "s,@configure_args@,|#_!!_#|,g"
        f.puts "s,@EXTOUT@,|#_!!_#|#{extout},g"
        f.puts "s,@bindir@,|#_!!_#|,g"
        f.puts "s,@ruby_install_name@,|#_!!_#|,g"
        f.puts "s,@ARCH_FLAG@,|#_!!_#|,g"
        f.puts "s,@CFLAGS@,|#_!!_#|,g"
        f.puts "s,@CPPFLAGS@,|#_!!_#|,g"
        f.puts "s,@LDFLAGS@,|#_!!_#|,g"
        f.puts "s,@DLDFLAGS@,|#_!!_#|,g"
        f.puts "s,@LIBEXT@,|#_!!_#|a,g"
        f.puts "s,@OBJEXT@,|#_!!_#|o,g"
        f.puts "s,@LIBRUBY@,|#_!!_#|liburyb.a,g"
        f.puts "s,@LIBRUBY_A@,|#_!!_#|liburyb.a,g"
      }
      FileUtils.mkpath(hdrdir = "#{extout}/include/ruby")
      File.open("#{hdrdir}/config.h", "w") {}
      miniruby = ENV['MINIRUBY'] + " -rcross"
      IO.popen("make -f - prereq srcdir=. IFCHANGE=tool/ifchange 'MINIRUBY=#{miniruby}'", "w") do |f|
        f.puts(IO.read("Makefile.in")[/^lex\.c.*?^$/m])
        f.puts(commonmk.gsub(/\{[^{}]*\}/, ""))
      end
      clean.push("rbconfig.rb", ".rbconfig.time")
      print "prerequisites"
    else
      system("#{YACC} -o parse.c parse.y")
    end
    FileUtils.rm_rf(clean)
    unless $?.success?
      puts " failed"
      return
    end
    puts " done"
  end

  if v == "."
    v = File.basename(Dir.pwd)
    Dir.chdir ".."
  end

  return [["bzip tarball", ".tar.bz2", %w"tar cjf"],
          ["gzip tarball", ".tar.gz", %w"tar czf"],
          ["zip archive", ".zip", %w"zip -qr"]
         ].collect do |mesg, ext, cmd|
    file = "#{destdir}/#{v||$archname}#{ext}"
    print "creating #{mesg}... #{file}"
    if system(*(cmd + [file, v]))
      puts " done"
      file
    else
      puts " failed"
      nil
    end
  end.compact
ensure
  FileUtils.rm_rf(v) if v and !$exported and !$keep_temp
end

revisions.collect {|rev| package(rev, destdir)}.flatten.each do |name|
  name or next
  str = open(name, "rb") {|f| f.read}
  md5 = Digest::MD5.hexdigest str
  sha = Digest::SHA256.hexdigest str
  puts "* #{name}"
  puts "  SIZE:   #{str.bytesize} bytes"
  puts "  MD5:    #{md5}" 
  puts "  SHA256: #{sha}"
  puts
end

# vim:fileencoding=US-ASCII sw=2 ts=4 noexpandtab ff=unix