44 lines
1.4 KiB
Ruby
44 lines
1.4 KiB
Ruby
require "vagrant/util/platform"
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module Vagrant
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module Util
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class Which
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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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#
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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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#
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# @param [String] cmd The command to search for in the PATH.
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# @return [String] The full path to the executable or `nil` if not found.
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def self.which(cmd)
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exts = nil
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if !Platform.windows? || ENV['PATHEXT'].nil?
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# If the PATHEXT variable is empty, we're on *nix and need to find
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# the exact filename
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exts = ['']
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elsif File.extname(cmd).length != 0
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# On Windows: if filename contains an extension, we must match that
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# exact filename
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exts = ['']
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else
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# On Windows: otherwise try to match all possible executable file
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# extensions (.EXE .COM .BAT etc.)
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exts = ENV['PATHEXT'].split(';')
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end
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ENV['PATH'].encode('UTF-8', 'binary', invalid: :replace, undef: :replace, replace: '').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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