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Great Ruby debugging companion: pretty print Ruby objects to visualize their structure. Supports custom object formatting via plugins
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 Project Readme

Amazing Print

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AmazingPrint is a fork of AwesomePrint which became stale and should be used in its place to avoid conflicts. It 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.

GitHub API demo

Supported Versions

  • Ruby >= 2.3
  • Rails >= 5.1

Installation

# Installing as Ruby gem
$ gem install amazing_print

# Cloning the repository
$ git clone git://github.com/amazing-print/amazing_print.git

Usage

require "amazing_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:       :whiteish,
  array:      :white,
  bigdecimal: :blue,
  class:      :yellow,
  date:       :greenish,
  falseclass: :red,
  integer:    :blue,
  float:      :blue,
  hash:       :whiteish,
  keyword:    :cyan,
  method:     :purpleish,
  nilclass:   :red,
  rational:   :blue,
  string:     :yellowish,
  struct:     :whiteish,
  symbol:     :cyanish,
  time:       :greenish,
  trueclass:  :green,
  variable:   :cyanish
}

Supported color names:

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

Use Object#ai to return an ASCII encoded string:

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

Examples

$ cat > 1.rb
require "amazing_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
    }
]

$ cat > 2.rb
require "amazing_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
}

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

$ cat > 4.rb
require "amazing_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
]

$ cat > 5.rb
require "amazing_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
]

$ cat > 6.rb
require "amazing_print"
ap 42 == ap(42)
^D
$ ruby 6.rb
42
true
$ cat 7.rb
require "amazing_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
]

$ cat 8.rb
require "amazing_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
]

Example (Rails console)

$ rails console
rails> require "amazing_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 => "(111)549-5002",
                    :fax => "(349)415-2266",
             :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 => "info@hayesdubuque.com",
        :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 => "(042)056-1534",
                    :fax => "(106)017-8792",
             :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 => "info@ziemannstreich.com",
        :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 amazing_print as default formatter in irb and Rails console add the following code to your ~/.irbrc file:

require "amazing_print"
AmazingPrint.irb!

PRY integration

If you miss amazing_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 "amazing_print"
AmazingPrint.pry!

Logger Convenience Method

amazing_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
# or
logger.ap object, level: :warn

You can also pass additional options (providing nil or leaving off level will log at the default level):

logger.ap object, { level: :info, sort_keys: true }

ActionView Convenience Method

amazing_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 AmazingPrint.defaults. For example:

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

Versioning

AmazingPrint 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.