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require 'tasks/config'
require 'pathname'
begin
  require 'zip/zipfilesystem'
rescue
  abort "rake development_dependencies"
end

#-----------------------------------------------------------------------
# Extensions
#-----------------------------------------------------------------------

if ext_config = Configuration.for_if_exist?('extension') then
  namespace :ext do
    def current_sqlite_version
      ext = Configuration.for('extension').configs.first
      path = Pathname.new( ext )
      h_path = path.dirname.realpath + "sqlite3.h"
      File.open( h_path ) do |f|
        f.each_line do |line|
          if line =~ /\A#define SQLITE_VERSION\s+/ then
            define ,constant ,value = line.split
            return value
          end
        end
      end
    end

    desc "Build the SQLite extension version #{current_sqlite_version}"
    task :build => :clean do
      ext_config.configs.each do |extension|
        path = Pathname.new(extension)
        parts = path.split
        conf = parts.last
        Dir.chdir(path.dirname) do |d|
          ruby conf.to_s
          sh "make"

          # install into requireable location so specs will run
          subdir = "amalgalite/#{RUBY_VERSION.sub(/\.\d$/,'')}"
          dest_dir = Amalgalite::Paths.lib_path( subdir )
          mkdir_p dest_dir, :verbose => true
          cp "amalgalite3.#{Config::CONFIG['DLEXT']}", dest_dir, :verbose => true
        end
      end
    end

    def myruby
      require 'rbconfig'
      x = File.join(
        RbConfig::CONFIG['bindir'],
        RbConfig::CONFIG['ruby_install_name']
      )
      #puts "myruby = #{x}"
      return x
    end

    def build_win( version = "1.8.7" )
      ext_config = Configuration.for("extension")
      rbconfig = ext_config.cross_rbconfig["rbconfig-#{version}"]
      raise ArgumentError, "No cross compiler for version #{version}, we have #{ext_config.cross_rbconfig.keys.join(",")}" unless rbconfig
     Amalgalite::GEM_SPEC.extensions.each do |extension|
        path = Pathname.new(extension)
        parts = path.split
        conf = parts.last
        rvm = File.expand_path( "~/.rvm/bin/rvm" )
        Dir.chdir(path.dirname) do |d|
          if File.exist?( "Makefile" ) then
            sh "make clean distclean"
          end
          cp "#{rbconfig}", "rbconfig.rb"
          rubylib = ENV['RUBYLIB']
          ENV['RUBYLIB'] = "."
          sh %[ #{rvm} #{version} -S extconf.rb #{myruby} ]
          ENV['RUBYLIB'] = rubylib
          sh "make"
        end
      end
    end

    win_builds = []
    ext_config.cross_rbconfig.keys.each do |v|
      s = v.split("-").last
      desc "Build the extension for windows version #{s}"
      win_bname = "build_win-#{s}"
      win_builds << win_bname
      task win_bname => :clean do
        build_win( s )
      end
    end

    task :clean do
      ext_config.configs.each do |extension|
        path = Pathname.new(extension)
        parts = path.split
        conf = parts.last
        Dir.chdir(path.dirname) do |d|
          if File.exist?( "Makefile" ) then
            sh "make clean"
          end
          rm_f "rbconfig.rb"
        end
      end
    end

    desc "List the sqlite api calls that are not implemented"
    task :todo do

      not_implementing = %w[
sqlite3_exec
sqlite3_open
sqlite3_os_end
sqlite3_os_init
sqlite3_malloc
sqlite3_realloc
sqlite3_free
sqlite3_get_table
sqlite3_free_table
sqlite3_key
sqlite3_rekey
sqlite3_next_stmt
sqlite3_release_memory
sqlite3_sleep
sqlite3_snprintf
sqlite3_vmprintf
sqlite3_strnicmp
sqlite3_test_control
sqlite3_unlock_notify
sqlite3_vfs_find
sqlite3_vfs_register
sqlite3_vfs_unregister
]

      sqlite_h = File.join( *%w[ ext amalgalite sqlite3.h ] )
      api_todo = {}
      IO.readlines( sqlite_h ).each do |line|
        if line =~ /\ASQLITE_API/ then
          if line !~ /SQLITE_DEPRECATED/ and line !~ /SQLITE_EXPERIMENTAL/ then
            if md = line.match( /(sqlite3_[^(\s]+)\(/ ) then
              next if not_implementing.include?(md.captures[0])
              api_todo[md.captures[0]] = true
            end
          end
        end
      end

      Dir.glob("ext/amalgalite/amalgalite*.c").each do |am_file|
        IO.readlines( am_file ).each do |am_line|
          if md = am_line.match( /(sqlite3_[^(\s]+)\(/ ) then
            api_todo.delete( md.captures[0] )
          end
        end
      end

      puts "#{api_todo.keys.size} functions to still implement"
      puts api_todo.keys.sort.join("\n")
    end

    task :clobber do
      ext_config.configs.each do |extension|
        path = Pathname.new(extension)
        parts = path.split
        conf = parts.last
        Dir.chdir(path.dirname) do |d|
          if File.exist?( "Makefile") then
            sh "make distclean"
          end
          rm_f "rbconfig.rb"
        end
      end
    end

    desc "Download and integrate the next version of sqlite (use VERSION=x.y.z)"
    task :update_sqlite do
      parts = ENV['VERSION'].split(".")
      next_version = [ parts.shift.to_s ]
      parts.each do |p|
        next_version << "#{"%02d" % p }"
      end
      next_version << "00" if next_version.size == 3

      next_version = next_version.join('')

      raise "VERSION env variable must be set" unless next_version
      url = URI.parse("http://sqlite.org/sqlite-amalgamation-#{next_version}.zip")
      puts "downloading #{url.to_s} ..."
      file = "tmp/#{File.basename( url.path ) }"
      FileUtils.mkdir "tmp" unless File.directory?( "tmp" )
      File.open( file, "wb+") do |f|
        res = Net::HTTP.get_response( url )
        f.write( res.body )
      end

      puts "extracting..."
      upstream_files = %w[ sqlite3.h sqlite3.c sqlite3ext.h ]
      Zip::ZipInputStream.open( file ) do |io|
        loop do
          entry = io.get_next_entry
          break unless entry
          bname = File.basename( entry.name )
          if upstream_files.include?( bname ) then
            dest_file = File.join( "ext", "amalgalite", bname )
            puts "updating #{dest_file}"
            entry.extract( dest_file ) { true }
          end
        end
      end
    end
  end
end
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