Method: TTY::Pager::SystemPager.command_exist?

Defined in:
lib/tty/pager/system.rb

.command_exist?(command) ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Check if command exists

Examples:

command_exist?("less") # => true

Parameters:

  • command (String) —

    the command to check

Returns:

  • (Boolean) 


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# File 'lib/tty/pager/system.rb', line 26

def self.command_exist?(command)
  exts = ENV.fetch("PATHEXT", "").split(::File::PATH_SEPARATOR)
  if Pathname.new(command).absolute?
    ::File.exist?(command) ||
      exts.any? { |ext| ::File.exist?("#{command}#{ext}")}
  else
    ENV.fetch("PATH", "").split(::File::PATH_SEPARATOR).any? do |dir|
      file = ::File.join(dir, command)
      ::File.exist?(file) ||
        exts.any? { |ext| ::File.exist?("#{file}#{ext}") }
    end
  end
end