awesome_print

Awesome Print

Awesome Print is a Ruby library that pretty prints Ruby objects in full color exposing their internal structure with proper indentation. Rails ActiveRecord objects and usage within Rails templates are supported via included mixins.

NOTE: awesome_print v1.9.0 may not work on Ruby versions 2.4 or older or Rails versions 4.2 or older. The upcoming awesome_print v2.0 will require Ruby v1.9.3 or later and Rails v3.0 or later.

Installation

# Installing as Ruby gem
$ gem install awesome_print

# Cloning the repository
$ git clone git://github.com/awesome-print/awesome_print.git

Usage

require "awesome_print"
ap object, options = {}

Default options:

indent:        4,      # Number of spaces for indenting.
index:         true,   # Display array indices.
html:          false,  # Use ANSI color codes rather than HTML.
multiline:     true,   # Display in multiple lines.
plain:         false,  # Use colors.
raw:           false,  # Do not recursively format instance variables.
sort_keys:     false,  # Do not sort hash keys.
sort_vars:     true,   # Sort instance variables.
limit:         false,  # Limit arrays & hashes. Accepts bool or int.
ruby19_syntax: false,  # Use Ruby 1.9 hash syntax in output.
class_name:    :class, # Method called to report the instance class name. (e.g. :to_s)
object_id:     true,   # Show object id.
color: {
  args:       :pale,
  array:      :white,
  bigdecimal: :blue,
  class:      :yellow,
  date:       :greenish,
  falseclass: :red,
  integer:    :blue,
  float:      :blue,
  hash:       :pale,
  keyword:    :cyan,
  method:     :purpleish,
  nilclass:   :red,
  rational:   :blue,
  string:     :yellowish,
  struct:     :pale,
  symbol:     :cyanish,
  time:       :greenish,
  trueclass:  :green,
  variable:   :cyanish
}

Supported color names:

:gray, :red, :green, :yellow, :blue, :purple, :cyan, :white
:black, :redish, :greenish, :yellowish, :blueish, :purpleish, :cyanish, :pale

Use Object#ai to return an ASCII encoded string:

irb> "awesome print".ai
=> "\e[0;33m\"awesome print\"\e[0m"

Examples

Array

$ cat > 1.rb
require "awesome_print"
data = [ false, 42, %w(forty two), { :now => Time.now, :class => Time.now.class, :distance => 42e42 } ]
ap data
^D
$ ruby 1.rb
[
    [0] false,
    [1] 42,
    [2] [
        [0] "forty",
        [1] "two"
    ],
    [3] {
           :class => Time < Object,
             :now => Fri Apr 02 19:55:53 -0700 2010,
        :distance => 4.2e+43
    }
]

Hash

$ cat > 2.rb
require "awesome_print"
data = { :now => Time.now, :class => Time.now.class, :distance => 42e42 }
ap data, :indent => -2  # <-- Left align hash keys.
^D
$ ruby 2.rb
{
  :class    => Time < Object,
  :now      => Fri Apr 02 19:55:53 -0700 2010,
  :distance => 4.2e+43
}

Nested array

$ cat > 3.rb
require "awesome_print"
data = [ false, 42, %w(forty two) ]
data << data  # <-- Nested array.
ap data, :multiline => false
^D
$ ruby 3.rb
[ false, 42, [ "forty", "two" ], [...] ]

Class methods

$ cat > 4.rb
require "awesome_print"
class Hello
  def self.world(x, y, z = nil, &blk)
  end
end
ap Hello.methods - Class.methods
^D
$ ruby 4.rb
[
    [0] world(x, y, *z, &blk) Hello
]

Object methods

$ cat > 5.rb
require "awesome_print"
ap (''.methods - Object.methods).grep(/!/)
^D
$ ruby 5.rb
[
    [ 0] capitalize!()           String
    [ 1]      chomp!(*arg1)      String
    [ 2]       chop!()           String
    [ 3]     delete!(*arg1)      String
    [ 4]   downcase!()           String
    [ 5]     encode!(*arg1)      String
    [ 6]       gsub!(*arg1)      String
    [ 7]     lstrip!()           String
    [ 8]       next!()           String
    [ 9]    reverse!()           String
    [10]     rstrip!()           String
    [11]      slice!(*arg1)      String
    [12]    squeeze!(*arg1)      String
    [13]      strip!()           String
    [14]        sub!(*arg1)      String
    [15]       succ!()           String
    [16]   swapcase!()           String
    [17]         tr!(arg1, arg2) String
    [18]       tr_s!(arg1, arg2) String
    [19]     upcase!()           String
]

Compare output to value

$ cat > 6.rb
require "awesome_print"
ap 42 == ap(42)
^D
$ ruby 6.rb
42
true

Array with default output limit

$ cat > 7.rb
require "awesome_print"
some_array = (1..1000).to_a
ap some_array, :limit => true
^D
$ ruby 7.rb
[
    [  0] 1,
    [  1] 2,
    [  2] 3,
    [  3] .. [996],
    [997] 998,
    [998] 999,
    [999] 1000
]

Array with specific output limit

$ cat > 8.rb
require "awesome_print"
some_array = (1..1000).to_a
ap some_array, :limit => 5
^D
$ ruby 8.rb
[
    [  0] 1,
    [  1] 2,
    [  2] .. [997],
    [998] 999,
    [999] 1000
]

Rails console

$ rails console
rails> require "awesome_print"
rails> ap Account.limit(2).all
[
    [0] #<Account:0x1033220b8> {
                     :id => 1,
                :user_id => 5,
            :assigned_to => 7,
                   :name => "Hayes-DuBuque",
                 :access => "Public",
                :website => "http://www.hayesdubuque.com",
        :toll_free_phone => "1-800-932-6571",
                  :phone => "[phone]",
                    :fax => "[phone]",
             :deleted_at => nil,
             :created_at => Sat, 06 Mar 2010 09:46:10 UTC +00:00,
             :updated_at => Sat, 06 Mar 2010 16:33:10 UTC +00:00,
                  :email => "[e-mail]",
        :background_info => nil
    },
    [1] #<Account:0x103321ff0> {
                     :id => 2,
                :user_id => 4,
            :assigned_to => 4,
                   :name => "Ziemann-Streich",
                 :access => "Public",
                :website => "http://www.ziemannstreich.com",
        :toll_free_phone => "1-800-871-0619",
                  :phone => "[phone]",
                    :fax => "[phone]",
             :deleted_at => nil,
             :created_at => Tue, 09 Feb 2010 13:32:10 UTC +00:00,
             :updated_at => Tue, 09 Feb 2010 20:05:01 UTC +00:00,
                  :email => "[e-mail]",
        :background_info => nil
    }
]
rails> ap Account
class Account < ActiveRecord::Base {
                 :id => :integer,
            :user_id => :integer,
        :assigned_to => :integer,
               :name => :string,
             :access => :string,
            :website => :string,
    :toll_free_phone => :string,
              :phone => :string,
                :fax => :string,
         :deleted_at => :datetime,
         :created_at => :datetime,
         :updated_at => :datetime,
              :email => :string,
    :background_info => :string
}
rails>

IRB integration

To use awesome_print as default formatter in irb and Rails console add the following code to your ~/.irbrc file:

require "awesome_print"
AwesomePrint.irb!

PRY integration

If you miss awesome_print's way of formatting output, here's how you can use it in place of the formatting which comes with pry. Add the following code to your ~/.pryrc:

require "awesome_print"
AwesomePrint.pry!

Logger Convenience Method

awesome_print adds the 'ap' method to the Logger and ActiveSupport::BufferedLogger classes letting you call:

logger.ap object

By default, this logs at the :debug level. You can override that globally with:

:log_level => :info

in the custom defaults (see below). You can also override on a per call basis with:

logger.ap object, :warn

ActionView Convenience Method

awesome_print adds the 'ap' method to the ActionView::Base class making it available within Rails templates. For example:

<%= ap @accounts.first %>   # ERB
!= ap @accounts.first       # HAML

With other web frameworks (ex: in Sinatra templates) you can explicitly request HTML formatting:

<%= ap @accounts.first, :html => true %>

String Convenience Methods

Use methods such as .red to set string color:

irb> puts "red text".red
red text # (it's red)

Setting Custom Defaults

You can set your own default options by creating .aprc file in your home directory. Within that file assign your defaults to AwesomePrint.defaults. For example:

# ~/.aprc file.
AwesomePrint.defaults = {
  :indent => -2,
  :color => {
    :hash  => :pale,
    :class => :white
  }
}

Versioning

AwesomePrint follows the Semantic Versioning standard.

Contributing

See CONTRIBUTING.md for information.

License

Copyright (c) 2010-2016 Michael Dvorkin and contributors

http://www.dvorkin.net

%w(mike dvorkin.net) * "@" || "twitter.com/mid"

Released under the MIT license. See LICENSE file for details.