# encoding: utf-8
require 'fedux_org_stdlib/core_ext/file/which'

module FeduxOrgStdlib
  class CommandFinder
    private

    attr_reader :search_paths, :alternatives

    public

    # Finds path to command
    #
    # It also considers other executables for one command
    #
    # @param [String, Array] alternatives
    #   The executables to be used
    #
    # @param [String, Array] search_paths
    #   The search path as multiple paths as array or string where single
    #   search paths are concatenated via ':'
    def initialize(alternatives:, search_paths:)
      @alternatives = Array(alternatives)
      @search_paths = Array(search_paths)
    end

    # Find path to command
    def path
      alternatives.each do |e|
        next unless path = File.which(e, search_paths.join(':'))

        return path
      end

      nil
    end

    # Return known commands
    def known_commands
      @alternatives
    end
  end
end