Class: File

Inherits:
Object show all
Defined in:
lib/nuggets/file/which.rb

Overview

–

#

A component of ruby-nuggets, some extensions to the Ruby programming # language. #

#

Copyright © 2007-2008 Jens Wille #

#

Authors: #

Jens Wille <jens.wille@uni-koeln.de>                                    #
                                                                        #

ruby-nuggets is free software; you can redistribute it and/or modify it # under the terms of the GNU General Public License as published by the Free # Software Foundation; either version 3 of the License, or (at your option) # any later version. #

#

ruby-nuggets is distributed in the hope that it will be useful, but WITHOUT # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for # more details. #

#

You should have received a copy of the GNU General Public License along # with ruby-nuggets. If not, see <www.gnu.org/licenses/>. #

#

++

Class Method Summary collapse

Class Method Details

.which(executable) ⇒ Object

call-seq:

File.which(executable) => aString or nil

Returns the full path to executable, or nil if not found in PATH. Inspired by Gnuplot.which – thx, Gordon!



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# File 'lib/nuggets/file/which.rb', line 37

def which(executable)
  return executable if executable?(executable)

  if path = ENV['PATH']
    path.split(PATH_SEPARATOR).each { |dir|
      candidate = join(dir, executable)
      return candidate if executable?(candidate)
    }
  end

  nil
end

.which_command(commands) ⇒ Object

call-seq:

File.which_command(commands) => aString or nil

Returns the first of commands that is executable.



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# File 'lib/nuggets/file/which.rb', line 54

def which_command(commands)
  commands.find { |command| which(command[/\S+/]) }
end