# encoding: utf-8
require 'fedux_org_stdlib/require_files'
require_library %w(pathname active_support/core_ext/object/blank)

module FeduxOrgStdlib
  module Command
    # Find path to executable
    module Which
      # Search for command
      # @param [String] cmd
      #    name of command or path to command (will be reduced to basename and then searched in PATH)
      #
      # @param [Array,String] paths
      #   a string containing paths separated by "File::PATH_SEPARATOR" or an array of paths
      #
      # @param [Array,String] pathexts
      #   a string containing pathexts separated by ";" or an array of pathexts
      #
      # @return [String]
      #   path to command
      def which(cmd, options = {})
        options = {
          paths:                         ENV['PATH'].split(File::PATH_SEPARATOR),
          pathexts:                      ENV['PATHEXT'].to_s.split(/;/),
          raise_error_on_not_executable: false,
          raise_error_on_not_found:      false
        }.merge options

        cmd = Pathname.new(cmd)

        paths                         = options[:paths]
        pathexts                      = options[:pathexts]
        raise_error_on_not_executable = options[:raise_error_on_not_executable]
        raise_error_on_not_found      = options[:raise_error_on_not_found]

        fail Exceptions::CommandNotFound if cmd.to_s.empty?
        return nil if cmd.to_s.empty?

        if cmd.absolute?
          return cmd.to_s if cmd.executable?
          fail Exceptions::CommandNotFound if raise_error_on_not_found && !cmd.exist?
          fail Exceptions::CommandNotExecutable if raise_error_on_not_executable && !cmd.executable?
          return nil
        end

        pathexts = [''] if pathexts.blank?

        Array(paths).each do |path|
          Array(pathexts).each do |ext|
            file = Pathname.new(File.join(path, "#{cmd}#{ext}"))
            return file.to_s if file.executable?
            fail Exceptions::CommandNotExecutable if raise_error_on_not_executable && !cmd.executable?
          end
        end
        fail Exceptions::CommandNotFound if raise_error_on_not_found
        nil
      end
    end
  end
end