ruby-mini-magick 3.8.1-1 / usr / lib / ruby / vendor_ruby / mini_magick / utilities.rb

require 'rbconfig'
require 'shellwords'
require 'pathname'

module MiniMagick
  module Utilities
    class << self
      # Cross-platform way of finding an executable in the $PATH.
      #
      #   which('ruby') #=> /usr/bin/ruby
      def which(cmd)
        exts = ENV['PATHEXT'] ? ENV['PATHEXT'].split(';') : ['']
        ENV['PATH'].split(File::PATH_SEPARATOR).each do |path|
          exts.each do |ext|
            exe = File.join(path, "#{cmd}#{ext}")
            return exe if File.executable? exe
          end
        end
        nil
      end

      # Finds out if the host OS is windows
      def windows?
        RbConfig::CONFIG['host_os'] =~ /mswin|mingw|cygwin/
      end

      def escape(value)
        if windows?
          windows_escape(value)
        else
          shell_escape(value)
        end
      end

      def shell_escape(value)
        Shellwords.escape(value)
      end

      def windows_escape(value)
        # For Windows, ^ is the escape char, equivalent to \ in Unix.
        escaped = value.gsub(/\^/, '^^').gsub(/>/, '^>')
        if escaped !~ /^".+"$/ && escaped.include?("'")
          escaped.inspect
        else
          escaped
        end
      end

      def path(path)
        if windows?
          # For Windows, if a path contains space char, you need to quote it,
          # otherwise you SHOULD NOT quote it. If you quote a path that does
          # not contains space, it will not work.
          pathname = Pathname.new(path).to_s
          path.include?(' ') ? pathname.inspect : pathname
        else
          path
        end
      end
    end
  end
end