37 lines
1.2 KiB
Ruby
37 lines
1.2 KiB
Ruby
module Vagrant
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module Util
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class FileUtil
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# Cross-platform way of finding an executable in the $PATH.
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#
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# which('ruby') #=> /usr/bin/ruby
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# by http://stackoverflow.com/users/11687/mislav
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#
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# This code is adapted from the following post by mislav:
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# http://stackoverflow.com/questions/2108727/which-in-ruby-checking-if-program-exists-in-path-from-ruby
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def self.which(cmd)
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# If the PATHEXT variable is empty, we're on *nix and need to find the exact filename
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exts = nil
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if !Util::Platform.windows? || ENV['PATHEXT'].nil?
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exts = ['']
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# On Windows: if filename contains an extension, we must match that exact filename
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elsif File.extname(cmd).length != 0
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exts = ['']
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# On Windows: otherwise try to match all possible executable file extensions (.EXE .COM .BAT etc.)
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else
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exts = ENV['PATHEXT'].split(';')
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end
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ENV['PATH'].split(File::PATH_SEPARATOR).each do |path|
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exts.each do |ext|
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exe = "#{path}#{File::SEPARATOR}#{cmd}#{ext}"
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return exe if File.executable? exe
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end
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end
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return nil
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end
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end
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end
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end
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