CODEWITHSUNDEEP
ruby-on-railsruby
user2912390
user2912390

Reputation: 116

Undefined method for string

I don't understand why I can't call the method colorize from color.rb.

I wrote include color inside the class, but when I try to execute the script I get this error in wget:

undefined method `colorize' for #<String:0x00000001152d30>

This is the code:

$LOAD_PATH << './lib'
 require 'color'

class Download
 include color
 def wget(arr)
   FileUtils.cd('/mnt/list')
   site = "xxxxx"
    arr.each do |f|
      wget = system("wget #{site}#{f}")
      logger.info("wget: #{f}".colorize("blue"))
    end
 end
end

The file color.rb with the method colorize 

module Color

 def colorize(color, options = {})
   background = options[:background] || options[:bg] || false
   style = options[:style]
   offsets = ["gray","red", "green", "yellow", "blue", "magenta", "cyan","white"]
   styles =   ["normal","bold","dark","italic","underline","xx","xx","underline","xx","strikethrough"]
   start = background ? 40 : 30
   color_code = start + (offsets.index(color) || 8)
   style_code = styles.index(style) || 0
   "\e[#{style_code};#{color_code}m#{self}\e[0m"
 end
end

Upvotes: 0

Views: 4809

Answers (1)

Aleksei Matiushkin
Aleksei Matiushkin

Reputation: 121000

As soon as you want to call colorize method on Strings instance, you should monkeypatch the String class:

class String
  include Color
end

include color string in your Download class is senseless.

The snippet might be put anywhere in your code, e. g. right after the Color module definition. Since you have String class monkeypatched as shown above, you yield an ability to call colorize on string instances. The summing up:

module Color
 def colorize(color, options = {})
 ....
 end
end

class String
  include Color
end

puts 'a'.colorize(...) # ⇒ works

Upvotes: 2

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