require 'rake'

require 'rbconfig'

require 'tsort'

require 'pathname'

require 'find'

class String

  rake_extension("/") do

    def / (arg)

      r = File.join(File.expand_path(self), arg.to_s())

      if arg.to_s.include? ?* or arg.to_s.include? ??

        r = Dir.glob(r)

        r.reject! { | f | (f =~ /\^.svn|^CVS|^\.hg|^\.git/i) != nil }

      end

      return r

    end

  end

end

(defined? VERBOSE) || (VERBOSE = nil)

class Object

  rake_extension("halt") do 

    def halt()

      begin

        require 'pry'      

      rescue LoadError 

        error("`pry` not installed, run `gem install pry` to install it")

      end

      begin

        require 'pry-byebug'

      rescue LoadError

        error("`pry-byebug` not installed, run `gem install pry-byebug` to install it")        

      end

      binding.pry

    end

  end  

  rake_extension("info") do 

    def info(message, details = nil)

      if (VERBOSE != nil)

        $stderr.puts "[INFO] #{message}"

        if (details) 

          $stderr.puts "      #{details}"

        end

      end

    end

  end  

  rake_extension("warn") do 

    def warn(message, details = nil)

      if (VERBOSE != nil)

        $stderr.puts "[WARN] #{message}"

        if (details) 

          $stderr.puts "      #{details}"

        end

      end

    end

  end  

  rake_extension("error") do

    def error(message)

      raise Exception.new(message)

    end

  end 

  rake_extension("error_unsupported_platform") do

    def error_unsupported_platform()

      error("Unsupported platform (#{RbConfig::CONFIG['host_os']})")

    end

  end 

  rake_extension("win32?") do

    def win32?      

      if win32_wine?

        return true

      end

      return (RbConfig::CONFIG['host_os'] =~ /mingw32/) != nil

    end

  end 

  rake_extension("win32_wine?") do

    def win32_wine?      

      return ENV['CROSSCOMPILE'] == 'wine'

    end

  end 

  rake_extension("unix?") do

    def unix?     

      if win32_wine?

        return false

      end      

      return (RbConfig::CONFIG['host_os'] =~ /linux|solaris/) != nil

    end

  end 

  rake_extension("linux?") do

    def linux?

      if win32_wine?

        return false

      end

      return (RbConfig::CONFIG['host_os'] =~ /linux/i) != nil

    end

  end 

  rake_extension("x86_64?") do

    def x86_64?

      return RbConfig::CONFIG['host_cpu'] == 'x86_64'

    end

  end 

  rake_extension("i386?") do

    def i386?

      return RbConfig::CONFIG['host_cpu'] == 'i386'

    end

  end 

  rake_extension("redefine") do

    def redefine(*args, &block)

      task_name, arg_names, deps = Rake.application.resolve_args(args)

      task = Rake.application.lookup(task_name)

      error "task #{task_name} not defined ant thus cannot be redefined" if not task

      info "Redefining task #{task.name}"

      task.clear()

      task.set_arg_names(arg_names)

      task.enhance(deps, &block)

    end

  end 

  rake_extension("clear") do

    def clear(*args, &block)

      if block_given? 

        error "Block has no meaning when clearing task prereqs"

      end

      task_name, arg_names, deps = Rake.application.resolve_args(args)

      deps = deps.collect { | each | each.to_s }

      task = Rake.application.lookup(task_name)

      return nil if not task

      info "Clearing dependencies of task #{task.name} (#{deps.join(", ")})"

      task.prerequisites.reject! { | each | deps.include? each.to_s  }    

      return task

    end

  end 

  class << self

    alias :__const_missing__ :const_missing

  end

  def self.const_missing(name)

    if ENV[name.to_s]

      return ENV[name.to_s]

    else

      return __const_missing__(name)

    end

  end

end

class Rake::Task

  class PrerequisiteSorter

    include TSort

    def initialize(task)

      @task = task

    end

    def each_prereq(task)

      task.prerequisites.each do | prereq |

        prereq_t = task.application.lookup(prereq, task.scope)

        if prereq_t

          yield prereq_t

        end

      end

    end

    def tsort_each_node(&block)

      each_prereq(@task, &block)      

    end

    def tsort_each_child(task, &block)      

      each_prereq(task, &block)      

    end

  end # class PrerequisiteSorter

  def all_prerequisites_sorted

    return PrerequisiteSorter.new(self).tsort.collect{ | t | t.name }

  end

end

module RakeFileUtils

  # Evaluates given command using a shell. If block is given

  # then block is evaluate with status, stdout and stderr.

  # If no block is given, return true if command is successfull

  #

  # if cwd: keyword is specified, then working directory is changed

  # to specified directory before the command is run.  

  def sh(cmd, cwd: Dir.pwd)        

    when_writing(cmd) do 

      if block_given? then

        chdir(cwd) do

          fu_output_message (cmd.kind_of?(Array) ? cmd.join(' ') : cmd)

          stdout, stderr, status = Open3.capture3(*cmd)

        end

        case block.arity

        when 1        

          yield status          

        when 2        

          yield status, stdout

        when 3        

          yield status, stdout, stderr

        else

          raise Exception.new("invalid arity of given block")

        end

        return status.success?

      else

        success = false

        chdir(cwd) do                

          fu_output_message (cmd.kind_of?(Array) ? cmd.join(' ') : cmd)

          system(*cmd)

          success = $?.success?

        end        

        if not success then

          raise Exception.new("command failed: #{cmd.kind_of?(Array) ? cmd.join(' ') : cmd}")

        end        

      end

    end

    return true

  end

  # Cross-platform way of finding an executable in the $PATH.

  #

  #   which('ruby') #=> /usr/bin/ruby  

  def which(cmd)

    exts = ENV['PATHEXT'] ? ENV['PATHEXT'].split(';') : ['']

    ENV['PATH'].split(File::PATH_SEPARATOR).each do |path|

      exts.each { |ext|

        exe = File.join(path, "#{cmd}#{ext}")

        return exe if File.executable?(exe) && !File.directory?(exe)

      }

    end

    return nil

  end

  def make(args = '')

    if win32?

      #sh "make.exe -N -f bc.mak #{args}"

      if win32_wine?

        def make_objdir(directory)              

          if File.exist? directory / 'bmake.bat'

            #puts "Making objbc in #{directory}"      

            if not File.exist?(directory / OBJ_DIR)

              #puts "Made objbc in #{directory}"      

              mkdir directory / OBJ_DIR

            end            

            Dir.entries(directory).each do | each |              

              if each != '.' and each != '..' and File.directory?(directory / each)

                #puts "  recursing into #{directory / each}"

                make_objdir(directory / each)

              end

            end

          end

        end

        make_objdir('.')

        sh "wine cmd /c #{MAKE} #{args}"

      else         

        sh "#{MAKE} #{args}"

      end

    else      

      sh "#{MAKE} #{args}"

    end

  end

  # Pretty much like sed. Replaces all occurences of `pattern` by `replacement` in given `file`.

  # If `inplace` is `true`, then the modified contents is written back to the file. Otherwise it

  # printed on `STDOUT`.

  def sed(pattern, replacement, file, inplace = false)

    contents = File.read(file)

    contents.gsub!(pattern, replacement)

    if inplace then

      cp file, "#{file}.bak"

      File.open(file, "w") { | f | f.puts contents }

    else

      STDOUT.puts contents

    end

  end

  # Create a compressed archive of `source`. Under Windows it creates

  # `.zip` archive, otherwise (on Linux) it creates `tar.bz2`. 

  # 

  # The archive is created in the same directory as the source and

  # has the same name unless explicitily specified by `archive:` option. 

  # If `remove: true` option is set to true, the original (`source`) directory is

  # removed after adding the archive. 

  #

  # As a side-effect, it generates a SHA256 checksum in file .sha256 unles

  # option `sha256: false` is given.

  # 

  # Examples: 

  #

  # Create `somedir.bar.bz2` on `/tmp` containg contants of `/tmp/somedir`:

  #

  #     zip '/tmp/somedir'

  #

  # Create `smalltalkx.bar.bz2` on `/tmp` containg contants of `/tmp/build_dir`

  # and remove `/tmp/build_dir` afterwards:

  # 

  #     zip '/tmp/build_dir', archive: 'smalltalkx', remove: true

  #  

  def zip(source, options = {})

    remove = options[:remove] || false

    archive = options[:archive] || nil

    sha256 = options[:sha256] || true

    suffix = win32? ? '.zip' : '.tar.bz2'

    if not archive then

      archive = "#{source}#{suffix}"

    else 

      if not archive.end_with? suffix then

        archive = "#{archive}#{suffix}"

      end

    end

    archive = File.expand_path(archive)

    chdir File.dirname(source) do

      if win32? then

        sh "zip -q -r #{remove ? '-T -m' : ''} \"#{archive}\" \"#{File.basename(source)}\""

      else 

        sh "tar cjf \"#{archive}\" #{remove ? '--remove-files' : ''} \"#{File.basename(source)}\""

      end

    end        

    if sha256 then

      require 'digest'

      File.open("#{archive}.sha256", "w") do | sum |

      	sum.write Digest::SHA256.file(archive).hexdigest

      end

    end

  end

  # Extract an (compressed) archive. 

  # 

  # Files are extracted to the directory that contains `archive` unless 

  # options `directory: "some/other/directory` is given. 

  # 

  # If file named `#{archive}.sha256` exists then SHA256 checksum is validated

  # against the one `.sha256` file. If differ, an `Exception` is raised.

  #

  # If option `remove: true` is given, then the archive is removed after

  # all files are extracted. 

  # 

  def unzip(archive, options = {})     

    directory = options[:directory] || File.dirname(archive)

    remove = options[:remove] || false

    archive = File.expand_path archive

    sha256 = "#{archive}.sha256"

    if File.exist? sha256 then

      require 'digest'

      actual = Digest::SHA256.file(archive).hexdigest

      expected = nil

      File.open(sha256) { | f | expected = f.read}

      if actual != expected then

        raise Exception.new("SHA256 checksum for #{archive} differ (actual #{actual}, expected #{expected}")

      end

    end

    chdir directory do      

      if archive.end_with? '.zip' then

        sh "unzip \"#{archive}\""

      elsif archive.end_with? '.tar.bz2' then

        sh "tar xjf \"#{archive}\""

      elsif archive.end_with? '.tar.gz' then

        sh "tar xzf \"#{archive}\""

      else

        raise Exception.new("Unknown archive type: #{File.basename(archive)}")        

      end       

    end

    if remove then

      rm_f archive

    end

  end

  # Like FileUtils.cp_r, but takes a filter proc that can return false 

  # to skip a file

  #

  # Note that if the filter rejects a subdirectory then everything within that

  # subdirectory is automatically skipped as well.

  #

  # Taken from http://www.ruby-forum.com/attachment/4467/filteredCopy.rb  

  # Both of these are modified from the implementations in fileutils.rb from 

  # Ruby 1.9.1p378  

  def cp_rx src, dest, options = {}, &filter

    fu_check_options options, OPT_TABLE['cp_r']

    fu_output_message "cp -r#{options[:preserve] ? 'p' : ''}#{options[:remove_destination] ? ' --remove-destination' : ''} #{[src,dest].flatten.join ' '}" if options[:verbose]

    return if options[:noop]

    fu_each_src_dest(src, dest) do |s, d|

        copy_entryx s, d, filter, options[:preserve], options[:dereference_root], options[:remove_destination]

    end

  end

  # Like FileUtils.copy_entry, but takes a filter proc that can return false to skip a file

  def copy_entryx(src, dest, filter, preserve = false, dereference_root = false, remove_destination = false)

    Entry_.new(src, nil, dereference_root).traverse do |ent|

        if filter.call(ent.path) then

          destent = Entry_.new(dest, ent.rel, false)

          File.unlink destent.path if remove_destination && File.file?(destent.path)

          ent.copy destent.path

          ent.copy_metadata destent.path if preserve

        end

    end

  end

  # * ruby implementation of find that follows symbolic directory links

  # * tested on ruby 1.9.3, ruby 2.0 and jruby on Fedora 20 linux

  # * you can use Find.prune

  # * detect symlinks to dirs by path "/" suffix; does nothing with files so `symlink?` method is working fine

  # * depth first order

  # * detects cycles and raises an error

  # * raises on broken links

  # * uses recursion in the `do_find` proc when directory links are met (takes a lot of nested links until SystemStackError, that's practically never)

  #

  # * use like: find_follow(".") {|f| puts f}

  #

  # Copyright (c) 2014 Red Hat inc

  #

  # Permission is hereby granted, free of charge, to any person obtaining a copy

  # of this software and associated documentation files (the "Software"), to deal

  # in the Software without restriction, including without limitation the rights

  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

  # copies of the Software, and to permit persons to whom the Software is

  # furnished to do so, subject to the following conditions:

  #

  # The above copyright notice and this permission notice shall be included in

  # all copies or substantial portions of the Software.

  #

  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

  # THE SOFTWARE.

  def find_follow(*paths)

    block_given? or return enum_for(__method__, *paths)

    link_cache = {}

    link_resolve = lambda { |path|

      # puts "++ link_resolve: #{path}" # trace

      if link_cache[path]

        return link_cache[path]

      else

        return link_cache[path] = Pathname.new(path).realpath.to_s

      end

    }

    # this lambda should cleanup `link_cache` from unnecessary entries

    link_cache_reset = lambda { |path|

      # puts "++ link_cache_reset: #{path}" # trace

      # puts link_cache.to_s # trace

      link_cache.select! do |k,v|

        path == k || k == "/" || path.start_with?(k + "/")

      end

      # puts link_cache.to_s # trace

    }

    link_is_recursive = lambda { |path|

      # puts "++ link_is_recursive: #{path}" # trace

      # the ckeck is useless if path is not a link but not our responsibility

      # we need to check full path for link cycles

      pn_initial = Pathname.new(path)

      unless pn_initial.absolute?

        # can we use `expand_path` here? Any issues with links?

        pn_initial = Pathname.new(File.join(Dir.pwd, path))

      end

      # clear unnecessary cache

      link_cache_reset.call(pn_initial.to_s)

      link_dst = link_resolve.call(pn_initial.to_s)

      pn_initial.ascend do |pn|

        if pn != pn_initial && link_dst == link_resolve.call(pn.to_s)

          return {:link => path, :dst => pn}

        end

      end

      return false

    }

    do_find = proc { |path|

      Find.find(path) do |path|

        if File.symlink?(path) && File.directory?(File.realpath(path))

          if path[-1] == "/"

            # probably hitting https://github.com/jruby/jruby/issues/1895

            yield(path.dup)

            Dir.new(path).each { |subpath|

              do_find.call(path + subpath) unless [".", ".."].include?(subpath)

            }

          elsif is_recursive = link_is_recursive.call(path)

            raise "cannot handle recursive links: #{is_recursive[:link]} => #{is_recursive[:dst]}"

          else

            do_find.call(path + "/")

          end

        else

          yield(path)

        end

      end

    }