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Editing: pathname.rb

#
# = pathname.rb
#
# Object-Oriented Pathname Class
#
# Author:: Tanaka Akira <akr@m17n.org>
# Documentation:: Author and Gavin Sinclair
#
# For documentation, see class Pathname.
#
# <tt>pathname.rb</tt> is distributed with Ruby since 1.8.0.
#

#
# == Pathname
#
# Pathname represents a pathname which locates a file in a filesystem.
# The pathname depends on OS: Unix, Windows, etc.
# Pathname library works with pathnames of local OS.
# However non-Unix pathnames are supported experimentally.
#
# It does not represent the file itself.
# A Pathname can be relative or absolute.  It's not until you try to
# reference the file that it even matters whether the file exists or not.
#
# Pathname is immutable.  It has no method for destructive update.
#
# The value of this class is to manipulate file path information in a neater
# way than standard Ruby provides.  The examples below demonstrate the
# difference.  *All* functionality from File, FileTest, and some from Dir and
# FileUtils is included, in an unsurprising way.  It is essentially a facade for
# all of these, and more.
#
# == Examples
#
# === Example 1: Using Pathname
#
#   require 'pathname'
#   p = Pathname.new("/usr/bin/ruby")
#   size = p.size              # 27662
#   isdir = p.directory?       # false
#   dir  = p.dirname           # Pathname:/usr/bin
#   base = p.basename          # Pathname:ruby
#   dir, base = p.split        # [Pathname:/usr/bin, Pathname:ruby]
#   data = p.read
#   p.open { |f| _ } 
#   p.each_line { |line| _ }
#
# === Example 2: Using standard Ruby
#
#   p = "/usr/bin/ruby"
#   size = File.size(p)        # 27662
#   isdir = File.directory?(p) # false
#   dir  = File.dirname(p)     # "/usr/bin"
#   base = File.basename(p)    # "ruby"
#   dir, base = File.split(p)  # ["/usr/bin", "ruby"]
#   data = File.read(p)
#   File.open(p) { |f| _ } 
#   File.foreach(p) { |line| _ }
#
# === Example 3: Special features
#
#   p1 = Pathname.new("/usr/lib")   # Pathname:/usr/lib
#   p2 = p1 + "ruby/1.8"            # Pathname:/usr/lib/ruby/1.8
#   p3 = p1.parent                  # Pathname:/usr
#   p4 = p2.relative_path_from(p3)  # Pathname:lib/ruby/1.8
#   pwd = Pathname.pwd              # Pathname:/home/gavin
#   pwd.absolute?                   # true
#   p5 = Pathname.new "."           # Pathname:.
#   p5 = p5 + "music/../articles"   # Pathname:music/../articles
#   p5.cleanpath                    # Pathname:articles
#   p5.realpath                     # Pathname:/home/gavin/articles
#   p5.children                     # [Pathname:/home/gavin/articles/linux, ...]
# 
# == Breakdown of functionality
#
# === Core methods
#
# These methods are effectively manipulating a String, because that's all a path
# is.  Except for #mountpoint?, #children, and #realpath, they don't access the
# filesystem.
#
# - +
# - #join
# - #parent
# - #root?
# - #absolute?
# - #relative?
# - #relative_path_from
# - #each_filename
# - #cleanpath
# - #realpath
# - #children
# - #mountpoint?
#
# === File status predicate methods
#
# These methods are a facade for FileTest:
# - #blockdev?
# - #chardev?
# - #directory?
# - #executable?
# - #executable_real?
# - #exist?
# - #file?
# - #grpowned?
# - #owned?
# - #pipe?
# - #readable?
# - #world_readable?
# - #readable_real?
# - #setgid?
# - #setuid?
# - #size
# - #size?
# - #socket?
# - #sticky?
# - #symlink?
# - #writable?
# - #world_writable?
# - #writable_real?
# - #zero?
#
# === File property and manipulation methods
#
# These methods are a facade for File:
# - #atime
# - #ctime
# - #mtime
# - #chmod(mode)
# - #lchmod(mode)
# - #chown(owner, group)
# - #lchown(owner, group)
# - #fnmatch(pattern, *args)
# - #fnmatch?(pattern, *args)
# - #ftype
# - #make_link(old)
# - #open(*args, &block)
# - #readlink
# - #rename(to)
# - #stat
# - #lstat
# - #make_symlink(old)
# - #truncate(length)
# - #utime(atime, mtime)
# - #basename(*args)
# - #dirname
# - #extname
# - #expand_path(*args)
# - #split
#
# === Directory methods
#
# These methods are a facade for Dir:
# - Pathname.glob(*args)
# - Pathname.getwd / Pathname.pwd
# - #rmdir
# - #entries
# - #each_entry(&block)
# - #mkdir(*args)
# - #opendir(*args)
#
# === IO
#
# These methods are a facade for IO:
# - #each_line(*args, &block)
# - #read(*args)
# - #readlines(*args)
# - #sysopen(*args)
#
# === Utilities
#
# These methods are a mixture of Find, FileUtils, and others:
# - #find(&block)
# - #mkpath
# - #rmtree
# - #unlink / #delete
#
#
# == Method documentation
#
# As the above section shows, most of the methods in Pathname are facades.  The
# documentation for these methods generally just says, for instance, "See
# FileTest.writable?", as you should be familiar with the original method
# anyway, and its documentation (e.g. through +ri+) will contain more
# information.  In some cases, a brief description will follow.
#
class Pathname

# :stopdoc:
  if RUBY_VERSION < "1.9"
    TO_PATH = :to_str
  else
    # to_path is implemented so Pathname objects are usable with File.open, etc.
    TO_PATH = :to_path
  end

SAME_PATHS = if File::FNM_SYSCASE.nonzero?
    proc {|a, b| a.casecmp(b).zero?}
  else
    proc {|a, b| a == b}
  end

# :startdoc:

#
  # Create a Pathname object from the given String (or String-like object).
  # If +path+ contains a NUL character (<tt>\0</tt>), an ArgumentError is raised.
  #
  def initialize(path)
    path = path.__send__(TO_PATH) if path.respond_to? TO_PATH
    @path = path.dup

if /\0/ =~ @path
      raise ArgumentError, "pathname contains \\0: #{@path.inspect}"
    end

self.taint if @path.tainted?
  end

def freeze() super; @path.freeze; self end
  def taint() super; @path.taint; self end
  def untaint() super; @path.untaint; self end

#
  # Compare this pathname with +other+.  The comparison is string-based.
  # Be aware that two different paths (<tt>foo.txt</tt> and <tt>./foo.txt</tt>)
  # can refer to the same file.
  #
  def ==(other)
    return false unless Pathname === other
    other.to_s == @path
  end
  alias === ==
  alias eql? ==

# Provides for comparing pathnames, case-sensitively.
  def <=>(other)
    return nil unless Pathname === other
    @path.tr('/', "\0") <=> other.to_s.tr('/', "\0")
  end

def hash # :nodoc:
    @path.hash
  end

# Return the path as a String.
  def to_s
    @path.dup
  end

# to_path is implemented so Pathname objects are usable with File.open, etc.
  alias_method TO_PATH, :to_s

def inspect # :nodoc:
    "#<#{self.class}:#{@path}>"
  end

# Return a pathname which is substituted by String#sub.
  def sub(pattern, *rest, &block)
    if block
      path = @path.sub(pattern, *rest) {|*args|
        begin
          old = Thread.current[:pathname_sub_matchdata]
          Thread.current[:pathname_sub_matchdata] = $~
          eval("$~ = Thread.current[:pathname_sub_matchdata]", block.binding)
        ensure
          Thread.current[:pathname_sub_matchdata] = old
        end
        yield(*args)
      }
    else
      path = @path.sub(pattern, *rest)
    end
    self.class.new(path)
  end

if File::ALT_SEPARATOR
    SEPARATOR_PAT = /[#{Regexp.quote File::ALT_SEPARATOR}#{Regexp.quote File::SEPARATOR}]/
  else
    SEPARATOR_PAT = /#{Regexp.quote File::SEPARATOR}/
  end

# chop_basename(path) -> [pre-basename, basename] or nil
  def chop_basename(path)
    base = File.basename(path)
    if /\A#{SEPARATOR_PAT}?\z/ =~ base
      return nil
    else
      return path[0, path.rindex(base)], base
    end
  end
  private :chop_basename

# split_names(path) -> prefix, [name, ...]
  def split_names(path)
    names = []
    while r = chop_basename(path)
      path, basename = r
      names.unshift basename
    end
    return path, names
  end
  private :split_names

def prepend_prefix(prefix, relpath)
    if relpath.empty?
      File.dirname(prefix)
    elsif /#{SEPARATOR_PAT}/ =~ prefix
      prefix = File.dirname(prefix)
      prefix = File.join(prefix, "") if File.basename(prefix + 'a') != 'a'
      prefix + relpath
    else
      prefix + relpath
    end
  end
  private :prepend_prefix

# Returns clean pathname of +self+ with consecutive slashes and useless dots
  # removed.  The filesystem is not accessed.
  #
  # If +consider_symlink+ is +true+, then a more conservative algorithm is used
  # to avoid breaking symbolic linkages.  This may retain more <tt>..</tt>
  # entries than absolutely necessary, but without accessing the filesystem,
  # this can't be avoided.  See #realpath.
  #
  def cleanpath(consider_symlink=false)
    if consider_symlink
      cleanpath_conservative
    else
      cleanpath_aggressive
    end
  end

#
  # Clean the path simply by resolving and removing excess "." and ".." entries.
  # Nothing more, nothing less.
  #
  def cleanpath_aggressive
    path = @path
    names = []
    pre = path
    while r = chop_basename(pre)
      pre, base = r
      case base
      when '.'
      when '..'
        names.unshift base
      else
        if names[0] == '..'
          names.shift
        else
          names.unshift base
        end
      end
    end
    if /#{SEPARATOR_PAT}/o =~ File.basename(pre)
      names.shift while names[0] == '..'
    end
    self.class.new(prepend_prefix(pre, File.join(*names)))
  end
  private :cleanpath_aggressive

# has_trailing_separator?(path) -> bool
  def has_trailing_separator?(path)
    if r = chop_basename(path)
      pre, basename = r
      pre.length + basename.length < path.length
    else
      false
    end
  end
  private :has_trailing_separator?

# add_trailing_separator(path) -> path
  def add_trailing_separator(path)
    if File.basename(path + 'a') == 'a'
      path
    else
      File.join(path, "") # xxx: Is File.join is appropriate to add separator?
    end
  end
  private :add_trailing_separator

def del_trailing_separator(path)
    if r = chop_basename(path)
      pre, basename = r
      pre + basename
    elsif /#{SEPARATOR_PAT}+\z/o =~ path
      $` + File.dirname(path)[/#{SEPARATOR_PAT}*\z/o]
    else
      path
    end
  end
  private :del_trailing_separator

def cleanpath_conservative
    path = @path
    names = []
    pre = path
    while r = chop_basename(pre)
      pre, base = r
      names.unshift base if base != '.'
    end
    if /#{SEPARATOR_PAT}/o =~ File.basename(pre)
      names.shift while names[0] == '..'
    end
    if names.empty?
      self.class.new(File.dirname(pre))
    else
      if names.last != '..' && File.basename(path) == '.'
        names << '.'
      end
      result = prepend_prefix(pre, File.join(*names))
      if /\A(?:\.|\.\.)\z/ !~ names.last && has_trailing_separator?(path)
        self.class.new(add_trailing_separator(result))
      else
        self.class.new(result)
      end
    end
  end
  private :cleanpath_conservative

def realpath_rec(prefix, unresolved, h)
    resolved = []
    until unresolved.empty?
      n = unresolved.shift
      if n == '.'
        next
      elsif n == '..'
        resolved.pop
      else
        path = prepend_prefix(prefix, File.join(*(resolved + [n])))
        if h.include? path
          if h[path] == :resolving
            raise Errno::ELOOP.new(path)
          else
            prefix, *resolved = h[path]
          end
        else
          s = File.lstat(path)
          if s.symlink?
            h[path] = :resolving
            link_prefix, link_names = split_names(File.readlink(path))
            if link_prefix == ''
              prefix, *resolved = h[path] = realpath_rec(prefix, resolved + link_names, h)
            else
              prefix, *resolved = h[path] = realpath_rec(link_prefix, link_names, h)
            end
          else
            resolved << n
            h[path] = [prefix, *resolved]
          end
        end
      end
    end
    return prefix, *resolved
  end
  private :realpath_rec

#
  # Returns a real (absolute) pathname of +self+ in the actual filesystem.
  # The real pathname doesn't contain symlinks or useless dots.
  #
  # No arguments should be given; the old behaviour is *obsoleted*. 
  #
  def realpath
    path = @path
    prefix, names = split_names(path)
    if prefix == ''
      prefix, names2 = split_names(Dir.pwd)
      names = names2 + names
    end
    prefix, *names = realpath_rec(prefix, names, {})
    self.class.new(prepend_prefix(prefix, File.join(*names)))
  end

# #parent returns the parent directory.
  #
  # This is same as <tt>self + '..'</tt>.
  def parent
    self + '..'
  end

# #mountpoint? returns +true+ if <tt>self</tt> points to a mountpoint.
  def mountpoint?
    begin
      stat1 = self.lstat
      stat2 = self.parent.lstat
      stat1.dev == stat2.dev && stat1.ino == stat2.ino ||
        stat1.dev != stat2.dev
    rescue Errno::ENOENT
      false
    end
  end

#
  # #root? is a predicate for root directories.  I.e. it returns +true+ if the
  # pathname consists of consecutive slashes.
  #
  # It doesn't access actual filesystem.  So it may return +false+ for some
  # pathnames which points to roots such as <tt>/usr/..</tt>.
  #
  def root?
    !!(chop_basename(@path) == nil && /#{SEPARATOR_PAT}/o =~ @path)
  end

# Predicate method for testing whether a path is absolute.
  # It returns +true+ if the pathname begins with a slash.
  def absolute?
    !relative?
  end

# The opposite of #absolute?
  def relative?
    path = @path
    while r = chop_basename(path)
      path, basename = r
    end
    path == ''
  end

#
  # Iterates over each component of the path.
  #
  #   Pathname.new("/usr/bin/ruby").each_filename {|filename| ... }
  #     # yields "usr", "bin", and "ruby".
  #
  def each_filename # :yield: filename
    prefix, names = split_names(@path)
    names.each {|filename| yield filename }
    nil
  end

# Iterates over and yields a new Pathname object
  # for each element in the given path in descending order.
  #
  #  Pathname.new('/path/to/some/file.rb').descend {|v| p v}
  #     #<Pathname:/>
  #     #<Pathname:/path>
  #     #<Pathname:/path/to>
  #     #<Pathname:/path/to/some>
  #     #<Pathname:/path/to/some/file.rb>
  #
  #  Pathname.new('path/to/some/file.rb').descend {|v| p v}
  #     #<Pathname:path>
  #     #<Pathname:path/to>
  #     #<Pathname:path/to/some>
  #     #<Pathname:path/to/some/file.rb>
  #
  # It doesn't access actual filesystem.
  #
  # This method is available since 1.8.5.
  #
  def descend
    vs = []
    ascend {|v| vs << v }
    vs.reverse_each {|v| yield v }
    nil
  end

# Iterates over and yields a new Pathname object
  # for each element in the given path in ascending order.
  #
  #  Pathname.new('/path/to/some/file.rb').ascend {|v| p v}
  #     #<Pathname:/path/to/some/file.rb>
  #     #<Pathname:/path/to/some>
  #     #<Pathname:/path/to>
  #     #<Pathname:/path>
  #     #<Pathname:/>
  #
  #  Pathname.new('path/to/some/file.rb').ascend {|v| p v}
  #     #<Pathname:path/to/some/file.rb>
  #     #<Pathname:path/to/some>
  #     #<Pathname:path/to>
  #     #<Pathname:path>
  #
  # It doesn't access actual filesystem.
  #
  # This method is available since 1.8.5.
  #
  def ascend
    path = @path
    yield self
    while r = chop_basename(path)
      path, name = r
      break if path.empty?
      yield self.class.new(del_trailing_separator(path))
    end
  end

#
  # Pathname#+ appends a pathname fragment to this one to produce a new Pathname
  # object.
  #
  #   p1 = Pathname.new("/usr")      # Pathname:/usr
  #   p2 = p1 + "bin/ruby"           # Pathname:/usr/bin/ruby
  #   p3 = p1 + "/etc/passwd"        # Pathname:/etc/passwd
  #
  # This method doesn't access the file system; it is pure string manipulation. 
  #
  def +(other)
    other = Pathname.new(other) unless Pathname === other
    Pathname.new(plus(@path, other.to_s))
  end

def plus(path1, path2) # -> path
    prefix2 = path2
    index_list2 = []
    basename_list2 = []
    while r2 = chop_basename(prefix2)
      prefix2, basename2 = r2
      index_list2.unshift prefix2.length
      basename_list2.unshift basename2
    end
    return path2 if prefix2 != ''
    prefix1 = path1
    while true
      while !basename_list2.empty? && basename_list2.first == '.'
        index_list2.shift
        basename_list2.shift
      end
      break unless r1 = chop_basename(prefix1)
      prefix1, basename1 = r1
      next if basename1 == '.'
      if basename1 == '..' || basename_list2.empty? || basename_list2.first != '..'
        prefix1 = prefix1 + basename1
        break
      end
      index_list2.shift
      basename_list2.shift
    end
    r1 = chop_basename(prefix1)
    if !r1 && /#{SEPARATOR_PAT}/o =~ File.basename(prefix1)
      while !basename_list2.empty? && basename_list2.first == '..'
        index_list2.shift
        basename_list2.shift
      end
    end
    if !basename_list2.empty?
      suffix2 = path2[index_list2.first..-1]
      r1 ? File.join(prefix1, suffix2) : prefix1 + suffix2
    else
      r1 ? prefix1 : File.dirname(prefix1)
    end
  end
  private :plus

#
  # Pathname#join joins pathnames.
  #
  # <tt>path0.join(path1, ..., pathN)</tt> is the same as
  # <tt>path0 + path1 + ... + pathN</tt>.
  #
  def join(*args)
    args.unshift self
    result = args.pop
    result = Pathname.new(result) unless Pathname === result
    return result if result.absolute?
    args.reverse_each {|arg|
      arg = Pathname.new(arg) unless Pathname === arg
      result = arg + result
      return result if result.absolute?
    }
    result
  end

#
  # Returns the children of the directory (files and subdirectories, not
  # recursive) as an array of Pathname objects.  By default, the returned
  # pathnames will have enough information to access the files.  If you set
  # +with_directory+ to +false+, then the returned pathnames will contain the
  # filename only.
  #
  # For example:
  #   p = Pathname("/usr/lib/ruby/1.8")
  #   p.children
  #       # -> [ Pathname:/usr/lib/ruby/1.8/English.rb,
  #              Pathname:/usr/lib/ruby/1.8/Env.rb,
  #              Pathname:/usr/lib/ruby/1.8/abbrev.rb, ... ]
  #   p.children(false)
  #       # -> [ Pathname:English.rb, Pathname:Env.rb, Pathname:abbrev.rb, ... ]
  #
  # Note that the result never contain the entries <tt>.</tt> and <tt>..</tt> in
  # the directory because they are not children.
  #
  # This method has existed since 1.8.1.
  #
  def children(with_directory=true)
    with_directory = false if @path == '.'
    result = []
    Dir.foreach(@path) {|e|
      next if e == '.' || e == '..'
      if with_directory
        result << self.class.new(File.join(@path, e))
      else
        result << self.class.new(e)
      end
    }
    result
  end

#
  # #relative_path_from returns a relative path from the argument to the
  # receiver.  If +self+ is absolute, the argument must be absolute too.  If
  # +self+ is relative, the argument must be relative too.
  #
  # #relative_path_from doesn't access the filesystem.  It assumes no symlinks.
  #
  # ArgumentError is raised when it cannot find a relative path.
  #
  # This method has existed since 1.8.1.
  #
  def relative_path_from(base_directory)
    dest_directory = self.cleanpath.to_s
    base_directory = base_directory.cleanpath.to_s
    dest_prefix = dest_directory
    dest_names = []
    while r = chop_basename(dest_prefix)
      dest_prefix, basename = r
      dest_names.unshift basename if basename != '.'
    end
    base_prefix = base_directory
    base_names = []
    while r = chop_basename(base_prefix)
      base_prefix, basename = r
      base_names.unshift basename if basename != '.'
    end
    unless SAME_PATHS[dest_prefix, base_prefix]
      raise ArgumentError, "different prefix: #{dest_prefix.inspect} and #{base_directory.inspect}"
    end
    while !dest_names.empty? &&
          !base_names.empty? &&
          SAME_PATHS[dest_names.first, base_names.first]
      dest_names.shift
      base_names.shift
    end
    if base_names.include? '..'
      raise ArgumentError, "base_directory has ..: #{base_directory.inspect}"
    end
    base_names.fill('..')
    relpath_names = base_names + dest_names
    if relpath_names.empty?
      Pathname.new('.')
    else
      Pathname.new(File.join(*relpath_names))
    end
  end
end

class Pathname    # * IO *
  #
  # #each_line iterates over the line in the file.  It yields a String object
  # for each line.
  #
  # This method has existed since 1.8.1.
  #
  def each_line(*args, &block) # :yield: line
    IO.foreach(@path, *args, &block)
  end

# Pathname#foreachline is *obsoleted* at 1.8.1.  Use #each_line.
  def foreachline(*args, &block)
    warn "Pathname#foreachline is obsoleted.  Use Pathname#each_line."
    each_line(*args, &block)
  end

# See <tt>IO.read</tt>.  Returns all the bytes from the file, or the first +N+
  # if specified.
  def read(*args) IO.read(@path, *args) end

# See <tt>IO.readlines</tt>.  Returns all the lines from the file.
  def readlines(*args) IO.readlines(@path, *args) end

# See <tt>IO.sysopen</tt>.
  def sysopen(*args) IO.sysopen(@path, *args) end
end

class Pathname    # * File *

# See <tt>File.atime</tt>.  Returns last access time.
  def atime() File.atime(@path) end

# See <tt>File.ctime</tt>.  Returns last (directory entry, not file) change time.
  def ctime() File.ctime(@path) end

# See <tt>File.mtime</tt>.  Returns last modification time.
  def mtime() File.mtime(@path) end

# See <tt>File.chmod</tt>.  Changes permissions.
  def chmod(mode) File.chmod(mode, @path) end

# See <tt>File.lchmod</tt>.
  def lchmod(mode) File.lchmod(mode, @path) end

# See <tt>File.chown</tt>.  Change owner and group of file.
  def chown(owner, group) File.chown(owner, group, @path) end

# See <tt>File.lchown</tt>.
  def lchown(owner, group) File.lchown(owner, group, @path) end

# See <tt>File.fnmatch</tt>.  Return +true+ if the receiver matches the given
  # pattern.
  def fnmatch(pattern, *args) File.fnmatch(pattern, @path, *args) end

# See <tt>File.fnmatch?</tt> (same as #fnmatch).
  def fnmatch?(pattern, *args) File.fnmatch?(pattern, @path, *args) end

# See <tt>File.ftype</tt>.  Returns "type" of file ("file", "directory",
  # etc).
  def ftype() File.ftype(@path) end

# See <tt>File.link</tt>.  Creates a hard link.
  def make_link(old) File.link(old, @path) end

# See <tt>File.open</tt>.  Opens the file for reading or writing.
  def open(*args, &block) # :yield: file
    File.open(@path, *args, &block)
  end

# See <tt>File.readlink</tt>.  Read symbolic link.
  def readlink() self.class.new(File.readlink(@path)) end

# See <tt>File.rename</tt>.  Rename the file.
  def rename(to) File.rename(@path, to) end

# See <tt>File.stat</tt>.  Returns a <tt>File::Stat</tt> object.
  def stat() File.stat(@path) end

# See <tt>File.lstat</tt>.
  def lstat() File.lstat(@path) end

# See <tt>File.symlink</tt>.  Creates a symbolic link.
  def make_symlink(old) File.symlink(old, @path) end

# See <tt>File.truncate</tt>.  Truncate the file to +length+ bytes.
  def truncate(length) File.truncate(@path, length) end

# See <tt>File.utime</tt>.  Update the access and modification times.
  def utime(atime, mtime) File.utime(atime, mtime, @path) end

# See <tt>File.basename</tt>.  Returns the last component of the path.
  def basename(*args) self.class.new(File.basename(@path, *args)) end

# See <tt>File.dirname</tt>.  Returns all but the last component of the path.
  def dirname() self.class.new(File.dirname(@path)) end

# See <tt>File.extname</tt>.  Returns the file's extension.
  def extname() File.extname(@path) end

# See <tt>File.expand_path</tt>.
  def expand_path(*args) self.class.new(File.expand_path(@path, *args)) end

# See <tt>File.split</tt>.  Returns the #dirname and the #basename in an
  # Array.
  def split() File.split(@path).map {|f| self.class.new(f) } end

# Pathname#link is confusing and *obsoleted* because the receiver/argument
  # order is inverted to corresponding system call.
  def link(old)
    warn 'Pathname#link is obsoleted.  Use Pathname#make_link.'
    File.link(old, @path)
  end

# Pathname#symlink is confusing and *obsoleted* because the receiver/argument
  # order is inverted to corresponding system call.
  def symlink(old)
    warn 'Pathname#symlink is obsoleted.  Use Pathname#make_symlink.'
    File.symlink(old, @path)
  end
end

class Pathname    # * FileTest *

# See <tt>FileTest.blockdev?</tt>.
  def blockdev?() FileTest.blockdev?(@path) end

# See <tt>FileTest.chardev?</tt>.
  def chardev?() FileTest.chardev?(@path) end

# See <tt>FileTest.executable?</tt>.
  def executable?() FileTest.executable?(@path) end

# See <tt>FileTest.executable_real?</tt>.
  def executable_real?() FileTest.executable_real?(@path) end

# See <tt>FileTest.exist?</tt>.
  def exist?() FileTest.exist?(@path) end

# See <tt>FileTest.grpowned?</tt>.
  def grpowned?() FileTest.grpowned?(@path) end

# See <tt>FileTest.directory?</tt>.
  def directory?() FileTest.directory?(@path) end

# See <tt>FileTest.file?</tt>.
  def file?() FileTest.file?(@path) end

# See <tt>FileTest.pipe?</tt>.
  def pipe?() FileTest.pipe?(@path) end

# See <tt>FileTest.socket?</tt>.
  def socket?() FileTest.socket?(@path) end

# See <tt>FileTest.owned?</tt>.
  def owned?() FileTest.owned?(@path) end

# See <tt>FileTest.readable?</tt>.
  def readable?() FileTest.readable?(@path) end

# See <tt>FileTest.world_readable?</tt>.
  def world_readable?() FileTest.world_readable?(@path) end

# See <tt>FileTest.readable_real?</tt>.
  def readable_real?() FileTest.readable_real?(@path) end

# See <tt>FileTest.setuid?</tt>.
  def setuid?() FileTest.setuid?(@path) end

# See <tt>FileTest.setgid?</tt>.
  def setgid?() FileTest.setgid?(@path) end

# See <tt>FileTest.size</tt>.
  def size() FileTest.size(@path) end

# See <tt>FileTest.size?</tt>.
  def size?() FileTest.size?(@path) end

# See <tt>FileTest.sticky?</tt>.
  def sticky?() FileTest.sticky?(@path) end

# See <tt>FileTest.symlink?</tt>.
  def symlink?() FileTest.symlink?(@path) end

# See <tt>FileTest.writable?</tt>.
  def writable?() FileTest.writable?(@path) end

# See <tt>FileTest.world_writable?</tt>.
  def world_writable?() FileTest.world_writable?(@path) end

# See <tt>FileTest.writable_real?</tt>.
  def writable_real?() FileTest.writable_real?(@path) end

# See <tt>FileTest.zero?</tt>.
  def zero?() FileTest.zero?(@path) end
end

class Pathname    # * Dir *
  # See <tt>Dir.glob</tt>.  Returns or yields Pathname objects.
  def Pathname.glob(*args) # :yield: p
    if block_given?
      Dir.glob(*args) {|f| yield self.new(f) }
    else
      Dir.glob(*args).map {|f| self.new(f) }
    end
  end

# See <tt>Dir.getwd</tt>.  Returns the current working directory as a Pathname.
  def Pathname.getwd() self.new(Dir.getwd) end
  class << self; alias pwd getwd end

# Pathname#chdir is *obsoleted* at 1.8.1.
  def chdir(&block)
    warn "Pathname#chdir is obsoleted.  Use Dir.chdir."
    Dir.chdir(@path, &block)
  end

# Pathname#chroot is *obsoleted* at 1.8.1.
  def chroot
    warn "Pathname#chroot is obsoleted.  Use Dir.chroot."
    Dir.chroot(@path)
  end

# Return the entries (files and subdirectories) in the directory, each as a
  # Pathname object.
  def entries() Dir.entries(@path).map {|f| self.class.new(f) } end

# Iterates over the entries (files and subdirectories) in the directory.  It
  # yields a Pathname object for each entry.
  #
  # This method has existed since 1.8.1.
  def each_entry(&block) # :yield: p
    Dir.foreach(@path) {|f| yield self.class.new(f) }
  end

# Pathname#dir_foreach is *obsoleted* at 1.8.1.
  def dir_foreach(*args, &block)
    warn "Pathname#dir_foreach is obsoleted.  Use Pathname#each_entry."
    each_entry(*args, &block)
  end

# See <tt>Dir.mkdir</tt>.  Create the referenced directory.
  def mkdir(*args) Dir.mkdir(@path, *args) end

# See <tt>Dir.rmdir</tt>.  Remove the referenced directory.
  def rmdir() Dir.rmdir(@path) end

# See <tt>Dir.open</tt>.
  def opendir(&block) # :yield: dir
    Dir.open(@path, &block)
  end
end

class Pathname    # * Find *
  #
  # Pathname#find is an iterator to traverse a directory tree in a depth first
  # manner.  It yields a Pathname for each file under "this" directory.
  #
  # Since it is implemented by <tt>find.rb</tt>, <tt>Find.prune</tt> can be used
  # to control the traverse.
  #
  # If +self+ is <tt>.</tt>, yielded pathnames begin with a filename in the
  # current directory, not <tt>./</tt>.
  #
  def find(&block) # :yield: p
    require 'find'
    if @path == '.'
      Find.find(@path) {|f| yield self.class.new(f.sub(%r{\A\./}, '')) }
    else
      Find.find(@path) {|f| yield self.class.new(f) }
    end
  end
end

class Pathname    # * FileUtils *
  # See <tt>FileUtils.mkpath</tt>.  Creates a full path, including any
  # intermediate directories that don't yet exist.
  def mkpath
    require 'fileutils'
    FileUtils.mkpath(@path)
    nil
  end

# See <tt>FileUtils.rm_r</tt>.  Deletes a directory and all beneath it.
  def rmtree
    # The name "rmtree" is borrowed from File::Path of Perl.
    # File::Path provides "mkpath" and "rmtree".
    require 'fileutils'
    FileUtils.rm_r(@path)
    nil
  end
end

class Pathname    # * mixed *
  # Removes a file or directory, using <tt>File.unlink</tt> or
  # <tt>Dir.unlink</tt> as necessary.
  def unlink()
    begin
      Dir.unlink @path
    rescue Errno::ENOTDIR
      File.unlink @path
    end
  end
  alias delete unlink

# This method is *obsoleted* at 1.8.1.  Use #each_line or #each_entry.
  def foreach(*args, &block)
    warn "Pathname#foreach is obsoleted.  Use each_line or each_entry."
    if FileTest.directory? @path
      # For polymorphism between Dir.foreach and IO.foreach,
      # Pathname#foreach doesn't yield Pathname object.
      Dir.foreach(@path, *args, &block)
    else
      IO.foreach(@path, *args, &block)
    end
  end
end

module Kernel
  # create a pathname object.
  #
  # This method is available since 1.8.5.
  def Pathname(path) # :doc:
    Pathname.new(path)
  end
  private :Pathname
end

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