Contents

require 'open3'

module Autowow
  class Command

    include EasyLogging

    def self.run(*args)
      Command.new(*args).check.explain.chronic_execute
    end

    def self.run_dry(*args)
      Command.new(*args).silent_check.execute
    end

    def self.popen3_reader(*args)
      args.each do |arg|
        reader = <<-EOF
          def #{arg}
            @#{arg} = @#{arg}.read.rstrip unless @#{arg}.is_a?(String)
            return @#{arg}
          end
        EOF
        class_eval(reader)
      end
    end

    popen3_reader :stdin, :stdout, :stderr
    attr_reader :wait_thr

    def initialize(*args)
      @cmd = args
    end

    def explain
      logger.debug(@cmd.join(' ')) unless @cmd.empty?
      self
    end

    def execute
      @stdin, @stdout, @stderr, @wait_thr = Open3.popen3(*@cmd) unless @cmd.empty?
      self
    end

    def chronic_execute
      @stdin, @stdout, @stderr, @wait_thr = Open3.popen3(*@cmd) unless @cmd.empty?
      logger.error(stderr) unless stderr.empty?
      self
    end

    def silent_check
      @stdin, @stdout, @stderr, @wait_thr = Open3.popen3('which', @cmd[0])
      unless output_matches?(not_empty_matcher)
        yield if block_given?
        @cmd = []
      end
      self
    end

    def check
      silent_check do
        logger.info("Skipping '#{@cmd.join(' ')}' because command '#{@cmd[0]}' is not found.")
      end
    end

    def output_matches?(matcher)
      stdout.match(matcher)
    end

    def output_does_not_match?(matcher)
      !output_matches?(matcher)
    end

    def not_empty_matcher
      %r{.*\S.*}
    end
  end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
autowow-0.3.0	lib/autowow/command.rb
autowow-0.2.0	lib/autowow/command.rb