Method: Bio::Command.call_command_popen

Defined in:
lib/bio/command.rb

.call_command_popen(cmd, options = {}) ⇒ Object

Executes the program via IO.popen for OS which doesn’t support fork. A block must be given. An IO object is passed to the block.

Arguments:

  • (required) cmd: Array containing String objects

  • (optional) options: Hash

Returns

(undefined)



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# File 'lib/bio/command.rb', line 161

def call_command_popen(cmd, options = {})
  str = make_command_line(cmd)
  # processing options
  if dir = options[:chdir] then
    case RUBY_PLATFORM
    when /mswin32|bccwin32/
      # Unix-like dir separator is changed to Windows dir separator
      # by using String#gsub.
      dirstr = dir.gsub(/\//, "\\")
      chdirstr = make_command_line([ 'cd', '/D', dirstr ])
      str = chdirstr + ' && ' + str
    else
      # UNIX shell
      chdirstr = make_command_line([ 'cd', dir ])
      str = chdirstr + ' && ' + str
    end
  end
  # call command by using IO.popen
  IO.popen(str, "w+") do |io|
    io.sync = true
    yield io
  end
end