Class: Pathname

Inherits:
Object
  • Object
show all
Defined in:
lib/downlow/ext/pathname.rb

Overview

we enhance pathname to make our code more readable

Instance Method Summary collapse

Instance Method Details

#abv ⇒ Object 



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# File 'lib/downlow/ext/pathname.rb', line 92

def abv
  out=''
  n=`find #{to_s} -type f | wc -l`.to_i
  out<<"#{n} files, " if n > 1
  out<<`/usr/bin/du -hd0 #{to_s} | cut -d"\t" -f1`.strip
end

#chmod_R(perms) ⇒ Object 



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# File 'lib/downlow/ext/pathname.rb', line 87

def chmod_R perms
  require 'fileutils'
  FileUtils.chmod_R perms, to_s
end

#cp(dst) ⇒ Object 



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# File 'lib/downlow/ext/pathname.rb', line 55

def cp dst
  if file?
    FileUtils.cp to_s, dst
  else
    FileUtils.cp_r to_s, dst
  end
  return dst
end

#extname ⇒ Object

extended to support the double extensions .tar.gz and .tar.bz2



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# File 'lib/downlow/ext/pathname.rb', line 65

def extname
  /(\.tar\.(gz|bz2))$/.match to_s
  return $1 if $1
  return File.extname(to_s)
end

#install(src) ⇒ Object 



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# File 'lib/downlow/ext/pathname.rb', line 28

def install src
  if src.is_a? Array
    src.collect {|src| install src }
  else
    raise "#{src} does not exist" unless File.exist? src
    mkpath
    if File.symlink? src
      # we use the BSD mv command because FileUtils copies the target and
      # not the link! I'm beginning to wish I'd used Python quite honestly!
      raise unless Kernel.system 'mv', src, to_s and $? == 0
    else
      # we mv when possible as it is faster and you should only be using
      # this function when installing from the temporary build directory
      FileUtils.mv src, to_s
    end
    src=Pathname.new src
    return self+src.basename
  end
end

#md5 ⇒ Object 



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# File 'lib/downlow/ext/pathname.rb', line 157

def md5
  require 'digest'
  Digest::MD5.hexdigest(File.read(self))
end

#rmdir_if_possible ⇒ Object

I don’t trust the children.length == 0 check particularly, not to mention it is slow to enumerate the whole directory just to see if it is empty, instead rely on good ol’ libc and the filesystem



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# File 'lib/downlow/ext/pathname.rb', line 79

def rmdir_if_possible
  rmdir
  true
rescue SystemCallError => e
  raise unless e.errno == Errno::ENOTEMPTY::Errno or e.errno == Errno::EACCES::Errno
  false
end

#stem ⇒ Object

for filetypes we support, basename without extension



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# File 'lib/downlow/ext/pathname.rb', line 72

def stem
  return File.basename(to_s, extname)
end

#version ⇒ Object

attempts to retrieve the version component of this path, so generally you’ll call it on tarballs or extracted tarball directories, if you add to this please provide amend the unittest



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# File 'lib/downlow/ext/pathname.rb', line 102

def version
  if directory?
    # directories don't have extnames
    stem=basename.to_s
  else
    stem=self.stem
  end

  # github tarballs are special
  # we only support numbered tagged downloads
  %r[github.com/.*/tarball/((\d\.)+\d)$].match to_s
  return $1 if $1

  # eg. boost_1_39_0
  /((\d+_)+\d+)$/.match stem
  return $1.gsub('_', '.') if $1

  # eg. foobar-4.5.1-1
  # eg. ruby-1.9.1-p243
  /-((\d+\.)*\d\.\d+-(p|rc)?\d+)$/.match stem
  return $1 if $1

  # eg. lame-398-1
  /-((\d)+-\d)/.match stem
  return $1 if $1

  # eg. foobar-4.5.1
  /-((\d+\.)*\d+)$/.match stem
  return $1 if $1

  # eg. foobar-4.5.1b
  /-((\d+\.)*\d+([abc]|rc\d))$/.match stem
  return $1 if $1

  # eg foobar-4.5.0-beta1
  /-((\d+\.)*\d+-beta\d+)$/.match stem
  return $1 if $1

  # eg. foobar4.5.1
  /((\d+\.)*\d+)$/.match stem
  return $1 if $1

  # eg foobar-4.5.0-bin
  /-((\d+\.)+\d+[abc]?)[-.](bin|src|sources?)$/.match stem
  return $1 if $1

  # eg. otp_src_R13B (this is erlang's style)
  # eg. astyle_1.23_macosx.tar.gz
  stem.scan /_([^_]+)/ do |match|
    return match.first if /\d/.match $1
  end

  nil
end

#write(content) ⇒ Object

we assume this pathname object is a file obviously



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# File 'lib/downlow/ext/pathname.rb', line 49

def write content
  raise "Will not overwrite #{to_s}" if exist? and not ARGV.force?
  dirname.mkpath
  File.open(self, 'w') {|f| f.write content }
end