pry, the good parts

Installing Pry

• gem install pry-plus --no-ri --no-rdoc

• Pry-plus contains pry + pry-doc (documentation for C methods)+ pry-debugger (step-through debugger)+ pry-rescue (opens pry on unhandled exceptions)+ pry-stack_explorer (call-stack navigation)+ gist support, bond support, more docs…

What’s Pry?

• “like irb, but better”

• Pry is a REPL for Ruby– (Read-Evaluate-Print Loop)

• An aide for ruby programmers

Pry as an aide

• Pry doesn’t solve your problems

• Pry helps you solve your problems

• Lots of simple tools to make your life better

Progress

• Introduction• How do I use the Base64 library?• Why doesn’t my method work?• Where did that nil come from?• What does ordinalize actually do?• Conclusion

How do I use the Base64 library?

$ pry[1] pry(main)> require ‘base64’=> true[2] pry(main)> ls Base64Base64.methods: decode64 encode64 strict_decode64 strict_encode64 urlsafe_decode64 urlsafe_encode64


$ pry[1] pry(main)> require ‘base64’=> true[2] pry(main)> ls Base64Base64.methods: decode64 encode64 strict_decode64 strict_encode64 urlsafe_decode64 urlsafe_encode64[3] pry(main)>


[2] pry(main)> ls Base64Base64.methods: decode64 encode64 strict_decode64 strict_encode64 urlsafe_decode64 urlsafe_encode64[3] pry(main)> (“hi”)=> “aGk=\n”[4] pry(main)> Base64.decode64(_)=> “hi”


[2] pry(main)> ls Base64Base64.methods: decode64 encode64 strict_decode64 strict_encode64 urlsafe_decode64 urlsafe_encode64[3] pry(main)> Base64.encode64(“hi”)=> “aGk=\n”[4] pry(main)> Base64.decode64(_)=> “hi”


[2] pry(main)> ls Base64Base64.methods: decode64 encode64 strict_decode64 strict_encode64 urlsafe_decode64 urlsafe_encode64[3] pry(main)> Base64.enc<tab>4(“hi”)=> “aGk=\n”[4] pry(main)> Base64.decode64(_)=> “hi”


[2] pry(main)> ls Base64Base64.methods: decode64 encode64 strict_decode64 strict_encode64 urlsafe_decode64 urlsafe_encode64[3] pry(main)> Base64.encode64(“hi”)=> “aGk=\n”[4] pry(main)> Base64.decode64(_)=> “hi”


[2] pry(main)> ls Base64Base64.methods: decode64 encode64 strict_decode64 strict_encode64 urlsafe_decode64 urlsafe_encode64[3] pry(main)> Base64.encode64 “hi”=> “aGk=\n”[4] pry(main)> Base64.decode64 _=> “hi”


[2] pry(main)> ls Base64Base64.methods: decode64 encode64 strict_decode64 strict_encode64 urlsafe_decode64 urlsafe_encode64[5] pry(main)>


[2] pry(main)> ls Base64Base64.methods: decode64 encode64 strict_decode64 strict_encode64 urlsafe_decode64 urlsafe_encode64[5] pry(main)> ? Base64.strict_encode64

How do I use the Base64 library?[5] pry(main)> ? Base64.strict_encode64

From: ~/ruby-1.9.3/lib/ruby/base64.rbOwner: #<Class:Base64>Visibility: publicSignature: strict_encode64(bin)

Returns the Base64-encoded version of bin.This method complies with RFC 4648.No line feeds are added.

How do I use the Base64 library?[5] pry(main)> ? Base64.encode64

From: ~/ruby-1.9.3/lib/ruby/base64.rbOwner: #<Class:Base64>Visibility: publicSignature: encode64(bin)

Returns the Base64-encoded version of bin.This method complies with RFC 2045.Line feeds are added every 60 characters.


• Evaluate ruby code.• Colour• Tab-completion• _ (the last output)• ls (list methods)• ? (show-doc)

Progress


Why doesn’t my method work?

• Broken code can be downloaded if you’re following along– (n.b. /raw/ is important!)

curl https://gist.github.com/raw/4463940 > basic_auth.rb

https://gist.github.com/4463940

Why doesn’t my method work?[1] pry(main)> cat basic_auth.rbrequire ‘base64’module BasicAuth def self.encode(username, password) s = [username, password].join(“:”) “Basic #{Base64.strict_encode64 s}” end

def self.decode(header) base64 = header[/Basic (.*)/, 1] Base64.decode64 base64.split(“:”) endend


[1] pry(main)> cat basic_auth.rb[2] pry(main)> require _file_=> true[3] pry(main)> BasicAuth.encode ‘hi’, ‘mum’=> “Basic aGk6bXVt”[4] pry(main)> BasicAuth.decode _NoMethodError: undefined method `unpack’ for [“aGk6bXVt”]:Array[4] pry(main)> wtf?0’


[1] pry(main)> cat basic_auth.rb[2] pry(main)> require _file_=> true[3] pry(main)> BasicAuth.encode ‘hi’, ‘mum’=> “Basic aGk6bXVt”[4] pry(main)> BasicAuth.decode _NoMethodError: undefined method `unpack’ for [“aGk6bXVt”]:Array[5] pry(main)> wtf?0’


[4] pry(main)> BasicAuth.decode _NoMethodError: undefined method `unpack’ for [“aGk6bXVt”]:Array[5] pry(main)> wtf?0: ~/ruby-1.9.3/lib/ruby/base64.rb:58 in `decode’1: ~/basic_auth.rb:10 in `decode’2: (pry):3 in `__pry__’


[4] pry(main)> BasicAuth.decode _NoMethodError: undefined method `unpack’ for [“aGk6bXVt”]:Array[5] pry(main)> wtf? 0: ~/ruby-1.9.3/lib/ruby/base64.rb:58 in `decode64’ 1: ~/basic_auth.rb:10 in `decode’ 2: (pry):3 in `__pry__’[6] pry(main)>


[5] pry(main)> wtf? 0: ~/ruby-1.9.3/lib/ruby/base64.rb:58 in `decode64’ 1: ~/basic_auth.rb:10 in `decode’ 2: (pry):3 in `__pry__’[6] pry(main)> $ BasicAuth.decode


[5] pry(main)> wtf? 0: ~/ruby-1.9.3/lib/ruby/base64.rb:58 in `decode64’ 1: ~/basic_auth.rb:10 in `decode’ 2: (pry):3 in `__pry__’[6] pry(main)> show-source BasicAuth.decode


[6] pry(main)> $ BasicAuth.decode

From: ~/basic_auth.rbOwner: #<Class:BasicAuth>Visibility: publicNumber of lines: 4

def self.decode(header) base64 = header[/Basic (.*)/, 1] Base64.decode64 base64.split(“:”)end


[5] pry(main)> wtf? 0: ~/ruby-1.9.3/lib/ruby/base64.rb:58 in `decode64’ 1: ~/basic_auth.rb:10 in `decode’ 2: (pry):3 in `__pry__’[6] pry(main)> $ BasicAuth.decode[7] pry(main)> edit-method


[5] pry(main)> wtf? 0: ~/ruby-1.9.3/lib/ruby/base64.rb:58 in `decode64’ 1: ~/basic_auth.rb:10 in `decode’ 2: (pry):3 in `__pry__’[6] pry(main)> $ BasicAuth.decode[7] pry(main)> edit-method <alt+_> (on Linux)


[5] pry(main)> wtf? 0: ~/ruby-1.9.3/lib/ruby/base64.rb:58 in `decode64’ 1: ~/basic_auth.rb:10 in `decode’ 2: (pry):3 in `__pry__’[6] pry(main)> $ BasicAuth.decode[7] pry(main)> edit-method <esc>_ (on a Mac)


[5] pry(main)> wtf? 0: ~/ruby-1.9.3/lib/ruby/base64.rb:58 in `decode64’ 1: ~/basic_auth.rb:10 in `decode’ 2: (pry):3 in `__pry__’[6] pry(main)> $ BasicAuth.decode[7] pry(main)> edit-method BasicAuth.decode


[7] pry(main)> edit-method BasicAuth.decode[8] pry(main)>


[7] pry(main)> edit-method BasicAuth.decode[8] pry(main)> <ctrl+r>


[7] pry(main)> edit-method BasicAuth.decode[8] pry(main)>(reverse-i-search)`’:


[7] pry(main)> edit-method BasicAuth.decode[8] pry(main)> BasicAuth.encode ‘hi’, ‘mum’(reverse-i-search)`enc’


[7] pry(main)> edit-method BasicAuth.decode[8] pry(main)> BasicAuth.encode ‘hi’, ‘mum’=> “Basic aGk6bXVt”[9] pry(main)>


[7] pry(main)> edit-method BasicAuth.decode[8] pry(main)> BasicAuth.encode ‘hi’, ‘mum’=> “Basic aGk6bXVt”[9] pry(main)> BasicAuth.decode _=> [“hi”, “mum”][10] pry(main)>


[7] pry(main)> edit-method BasicAuth.decode[8] pry(main)> BasicAuth.encode ‘hi’, ‘mum’=> “Basic aGk6bXVt”[9] pry(main)> BasicAuth.decode _=> [“hi”, “mum”][10] pry(main)> BasicAuth.decode _out_[3]


[7] pry(main)> edit-method BasicAuth.decode[8] pry(main)> BasicAuth.encode ‘hi’, ‘mum’=> “Basic aGk6bXVt”[9] pry(main)> BasicAuth.decode _=> [“hi”, “mum”][10] pry(main)> BasicAuth.decode _out_[3]=> [“hi”, “mum”]


• wtf? (show backtrace, also _ex_.backtrace)• $ (show-source)• edit-method (uses $EDITOR)• <Alt+_>, <esc>_ (copy last word down)• <ctrl+r> (search history)• _file_ (last shown file, also _dir_)• _out_ (array of all output values, also _in_)

Progress


Where did that nil come from?

• To follow along get the next file – (the /raw/ is still important)

• curl https://gist.github.com/raw/4464704 > post.rb

https://gist.github.com/raw/4464704




$ ruby post.rbpost.rb:11:in `make_safe': undefined method `gsub' for nil:NilClass (NoMethodError)

from post.rb:7:in `safe_title'from post.rb:19:in `<main>’

$


$ ruby post.rbpost.rb:11:in `make_safe': undefined method `gsub' for nil:NilClass (NoMethodError)

from post.rb:7:in `safe_title'from post.rb:19:in `<main>’

$ subl post.rb


$ subl post.rb$


$ subl post.rb$ ruby post.rb

Where did that nil come from?$ subl post.rb$ ruby post.rbFrom: post.rb @ line 19 :

16: new_post = Post.new( 17: 'title' => 'new post', 18: 'body' => 'your text here') => 19: binding.pry # Added for debugging 20: puts new_post.safe_title

[1] pry(main)>



[1] pry(main)> puts new_post.safe_title



[1] pry(main)> puts new_post.safe_titleNoMethodError: undefined method `gsub' for nil

Where did that nil come from?[1] pry(main)> puts new_post.safe_titleNoMethodError: undefined method `gsub' for nil[2] pry(main)>

Where did that nil come from?[1] pry(main)> puts new_post.safe_titleNoMethodError: undefined method `gsub' for nil[2] pry(main)> cd new_post

Where did that nil come from?[1] pry(main)> puts new_post.safe_titleNoMethodError: undefined method `gsub' for nil[2] pry(main)> cd new_post[3] pry(#<Post>):1>

Where did that nil come from?[1] pry(main)> puts new_post.safe_titleNoMethodError: undefined method `gsub' for nil[2] pry(main)> cd new_post[3] pry(#<Post>):1> ls

Where did that nil come from?[1] pry(main)> puts new_post.safe_titleNoMethodError: undefined method `gsub' for nil[2] pry(main)> cd new_post[3] pry(#<Post>):1> lsPost#methods: make_safe safe_titleinstance variables: @paramslocals: _ _dir_ _ex_ _file_ _in_ _out_ _pry_[4] pry(#<Post>):1>

Where did that nil come from?[1] pry(main)> puts new_post.safe_titleNoMethodError: undefined method `gsub' for nil[2] pry(main)> cd new_post[3] pry(#<Post>):1> lsPost#methods: make_safe safe_titleinstance variables: @paramslocals: _ _dir_ _ex_ _file_ _in_ _out_ _pry_[4] pry(#<Post>):1> $ safe_title

Where did that nil come from?[1] pry(main)> puts new_post.safe_titleNoMethodError: undefined method `gsub' for nil[2] pry(main)> cd new_post[3] pry(#<Post>):1> lsPost#methods: make_safe safe_titleinstance variables: @paramslocals: _ _dir_ _ex_ _file_ _in_ _out_ _pry_[4] pry(#<Post>):1> $ Post#safe_title

Where did that nil come from?[4] pry(#<Post>):1> $ safe_titleFrom: post.rb @ line 7:Number of lines: 3Owner: PostVisibility: public

def safe_title make_safe @params[:title]end[5] pry(#<Post>):1>


def safe_title make_safe @params[:title]end[5] pry(#<Post>):1> @params


def safe_title make_safe @params[:title]end[5] pry(#<Post>):1> @params{“title”=>”new post”, “body”=>”your text here”}[6] pry(#<Post>):1>


def safe_title make_safe @params[:title]end[5] pry(#<Post>):1> @params{“title”=>”new post”, “body”=>”your text here”}[6] pry(#<Post>):1> edit --ex


[5] pry(#<Post>):1> @params{“title”=>”new post”, “body”=>”your text here”}[6] pry(#<Post>):1> edit --ex[7] pry(#<Post>):1>


[5] pry(#<Post>):1> @params{“title”=>”new post”, “body”=>”your text here”}[6] pry(#<Post>):1> edit --ex[7] pry(#<Post>):1> .git diff

Where did that nil come from?[7] pry(#<Post>):1> .git diffdiff --git a/post.rb b/post.rbindex d0ed356..057d37c 100644--- a/post.rb+++ b/post.rb@@ -4, 7 +4,7 @@ class Post end

def safe_title- make_safe @params[:title] + make_safe @params[‘title’] end [8] pry(#<Post>):1>

Where did that nil come from?[7] pry(#<Post>):1> .git diffdiff --git a/post.rb b/post.rbindex d0ed356..057d37c 100644--- a/post.rb+++ b/post.rb@@ -4, 7 +4,7 @@ class Post end

def safe_title- make_safe @params[:title]+ make_safe @params[‘title’] end [8] pry(#<Post>):1> cd ..

Where did that nil come from?[8] pry(#<Post>):1> cd ..[9] pry(main)>

Where did that nil come from?[8] pry(#<Post>):1> cd ..[9] pry(main)> whereami

Where did that nil come from?[8] pry(#<Post>):1> cd ..[9] pry(main)> whereamiFrom: post.rb @ line 19 :

16: new_post = Post.new( 17: 'title' => 'new post', 18: 'body' => 'your text here') => 19: binding.pry # Added for debugging 20: puts new_post.safe_title[10] pry(main)>

Where did that nil come from?[8] pry(#<Post>):1> cd ..[9] pry(main)> whereamiFrom: post.rb @ line 19 :

16: new_post = Post.new( 17: 'title' => 'new post', 18: 'body' => 'your text here') => 19: binding.pry # Added for debugging 20: puts new_post.safe_title[10] pry(main)> puts new_post.safe_title

Where did that nil come from?[9] pry(main)> whereamiFrom: post.rb @ line 19 :

16: new_post = Post.new( 17: 'title' => 'new post', 18: 'body' => 'your text here') => 19: binding.pry # Added for debugging 20: puts new_post.safe_title[10] pry(main)> puts new_post.safe_titlenew-post=> nil[11] pry(main)>

Where did that nil come from?[10] pry(main)> puts new_post.safe_titlenew-post=> nil[11] pry(main)> puts new_post.safe_title;

Where did that nil come from?[10] pry(main)> puts new_post.safe_titlenew-post=> nil[11] pry(main)> puts new_post.safe_title;new-post[12] pry(main)>

Where did that nil come from?[10] pry(main)> puts new_post.safe_titlenew-post=> nil[11] pry(main)> puts new_post.safe_title;new-post[12] pry(main)> <ctrl+d>


• binding.pry (open pry right here, right now)• cd (change self)• whereami• edit --ex (also, edit -i)• . (run’s shell commands)• <ctrl-d> (cd .. or exit)• ; (suppress output)

Progress


What does ordinalize actually do?

[1] pry(main)>


[1] pry(main)> help gem


[1] pry(main)> help gemGems gem-cd Change working directory to specified gem's directory. gem-install Install a gem and refresh the gem cache. gem-list List and search installed gems. gem-open Opens the working directory of the gem in your editor.[2] pry(main)>


[1] pry(main)> help gemGems gem-cd Change working directory to specified gem's directory. gem-install Install a gem and refresh the gem cache. gem-list List and search installed gems. gem-open Opens the working directory of the gem in your editor.[2] pry(main)> help gem-install


[1] pry(main)> help gemGems gem-cd Change working directory to specified gem's directory. gem-install Install a gem and refresh the gem cache. gem-list List and search installed gems. gem-open Opens the working directory of the gem in your editor.[2] pry(main)> gem-install --help


[2] pry(main)> gem-install --helpUsage: gem-install GEM_NAME

Installs the given gem and refreshes the gem cache so that you can immediately 'require GEM_FILE'

-h, --help Show this message.[3] pry(main)>


[1] pry(main)> help gem[2] pry(main)> gem-install --help[3] pry(main)> gem-install activesupport


[3] pry(main)> gem-install activesupportFetching: i18n-0.6.1.gem (100%)Fetching: multi_json-1.5.0.gem (100%)Fetching: activesupport-3.2.10.gem (100%)Gem `activesupport` installed.[4] pry(main)>


[3] pry(main)> gem-install activesupportFetching: i18n-0.6.1.gem (100%)Fetching: multi_json-1.5.0.gem (100%)Fetching: activesupport-3.2.10.gem (100%)Gem `activesupport` installed.[3] pry(main)> require ‘active_support/core_ext’


[3] pry(main)> gem-install activesupportFetching: i18n-0.6.1.gem (100%)Fetching: multi_json-1.5.0.gem (100%)Fetching: activesupport-3.2.10.gem (100%)Gem `activesupport` installed.[4] pry(main)> require ‘active_support/core_ext’=> true[5] pry(main)>


[3] pry(main)> gem-install activesupportFetching: i18n-0.6.1.gem (100%)Fetching: multi_json-1.5.0.gem (100%)Fetching: activesupport-3.2.10.gem (100%)Gem `activesupport` installed.[4] pry(main)>require ‘active_support/core_ext’=> true[5] pry(main)> 5.ordinalize=> “5th”[6] pry(main)>


[3] pry(main)> gem-install activesupportFetching: i18n-0.6.1.gem (100%)Fetching: multi_json-1.5.0.gem (100%)Fetching: activesupport-3.2.10.gem (100%)Gem `activesupport` installed.[4] pry(main)>require ‘active_support/core_ext’=> True[5] pry(main)> 5.ordinalize=> “5th”[6] pry(main)> break Fixnum#ordinalize


[6] pry(main)> break Fixnum#ordinalizeBreakpoint 1: core_ext/integer/inflections.rb:14

12: # -1001.ordinalize # => "-1001st" 13: # => 14: def ordinalize 15: Inflector.ordinalize(self) 16: end 17: end

[7] pry(main)>


[6] pry(main)> break Fixnum#ordinalizeBreakpoint 1: core_ext/integer/inflections.rb:14

12: # -1001.ordinalize # => "-1001st" 13: # => 14: def ordinalize 15: Inflector.ordinalize(self) 16: end 17: end

[7] pry(main)> 5.ordinalize


[7] pry(main)> 5.ordinalizeBreakpoint 1. First hit.

From: core_ext/integer/inflections.rb:14:

=> 14: def ordinalize 15: Inflector.ordinalize(self) 16: end

[8] pry(5)>


[7] pry(main)> 5.ordinalizeBreakpoint 1. First hit.

From: core_ext/integer/inflections.rb:14:

=> 14: def ordinalize 15: Inflector.ordinalize(self) 16: end

[8] pry(5)> step


[8] pry(5)> stepFrom: core_ext/integer/inflections.rb:15:

14: def ordinalize => 15: Inflector.ordinalize(self) 16: end

[9] pry(5)>


[8] pry(5)> stepFrom: core_ext/integer/inflections.rb:15:

14: def ordinalize => 15: Inflector.ordinalize(self) 16: end

[9] pry(5)> step

What does ordinalize actually do? [9] pry(5)> stepFrom: active_support/inflector/methods.rb:280 279: def ordinalize(number) => 280: if (11..13).include?(number.to_i.abs % 100) 281: "#{number}th" 282: else 283: case number.to_i.abs % 10 284: when 1; "#{number}st" 285: when 2; "#{number}nd" 286: when 3; "#{number}rd" 287: else "#{number}th" 288: end 289: end 290: end

[10] pry(ActiveSupport::Inflector)>

What does ordinalize actually do? [9] pry(5)> stepFrom: active_support/inflector/methods.rb:280 279: def ordinalize(number) => 280: if (11..13).include?(number.to_i.abs % 100) 281: "#{number}th" 282: else 283: case number.to_i.abs % 10 284: when 1; "#{number}st" 285: when 2; "#{number}nd" 286: when 3; "#{number}rd" 287: else "#{number}th" 288: end 289: end 290: end

[10] pry(ActiveSupport::Inflector)> next

What does ordinalize actually do? [10] pry(ActiveSupport::Inflector)> nextFrom: active_support/inflector/methods.rb:283 279: def ordinalize(number) 280: if (11..13).include?(number.to_i.abs % 100) 281: "#{number}th" 282: else => 283: case number.to_i.abs % 10 284: when 1; "#{number}st" 285: when 2; "#{number}nd" 286: when 3; "#{number}rd" 287: else "#{number}th" 288: end 289: end 290: end


What does ordinalize actually do? [10] pry(ActiveSupport::Inflector)> nextFrom: active_support/inflector/methods.rb:283 279: def ordinalize(number) 280: if (11..13).include?(number.to_i.abs % 100) 281: "#{number}th" 282: else => 283: case number.to_i.abs % 10 284: when 1; "#{number}st" 285: when 2; "#{number}nd" 286: when 3; "#{number}rd" 287: else "#{number}th" 288: end 289: end 290: end

[11] pry(ActiveSupport::Inflector)> next

What does ordinalize actually do? [11] pry(ActiveSupport::Inflector)> nextFrom: active_support/inflector/methods.rb:287 279: def ordinalize(number) 280: if (11..13).include?(number.to_i.abs % 100) 281: "#{number}th" 282: else 283: case number.to_i.abs % 10 284: when 1; "#{number}st" 285: when 2; "#{number}nd" 286: when 3; "#{number}rd" => 287: else "#{number}th" 288: end 289: end 290: end


What does ordinalize actually do? [11] pry(ActiveSupport::Inflector)> nextFrom: active_support/inflector/methods.rb:287 279: def ordinalize(number) 280: if (11..13).include?(number.to_i.abs % 100) 281: "#{number}th" 282: else 283: case number.to_i.abs % 10 284: when 1; "#{number}st" 285: when 2; "#{number}nd" 286: when 3; "#{number}rd" => 287: else "#{number}th" 288: end 289: end 290: end

[12] pry(ActiveSupport::Inflector)> continue

What does ordinalize actually do? [12] pry(ActiveSupport::Inflector)> continue=> “5th”[13] pry(main)>

What does ordinalize actually do? [12] pry(ActiveSupport::Inflector)> continue=> “5th”[13] pry(main)> gist -m ActiveSupport::Inflector.ordinalize

What does ordinalize actually do? [12] pry(ActiveSupport::Inflector)> continue=> “5th”[13] pry(main)> gist –m ActiveSupport::Inflector.ordinalizeGist created at https://gist.github.com/465407823ee6182d8833 and added to clipboard.[14] pry(main)>

What does ordinalize actually do? [12] pry(ActiveSupport::Inflector)> continue=> “5th”[13] pry(main)> gist –m ActiveSupport::Inflector.ordinalizeGist created at https://gist.github.com/465407823ee6182d8833 and added to clipboard,[14] pry(main)> !!!

What does ordinalize actually do? [12] pry (ActiveSupport::Inflector)> continue=> “5th”[13] pry(main)> gist –m ActiveSupport::Inflector.ordinalizeGist created at https://gist.github.com/465407823ee6182d8833 and added to clipboard,[14] pry(main)> !!!$


• help (and --help)• break (pry-debugger)• step/next/continue (pry-debugger)• gist• gem-install (-cd, -open, -list)• !!! (exit)

Progress


More good plugins (pry-plus)!

• pry-rescue– Automatic binding.pry where-ever you have an

unhandled exception or test failure.• pry-stack_explorer– Lets you move up-and-down the callstack.

• pry-doc, pry-docmore– ?/show-doc for C methods, ruby syntax

• bond– Better-yet tab completion

Configuration

• Configuration– ./.pryrc and ~/.pryrc

• Custom commands Pry.commands.add_command ‘test’ do output.puts “test” end

• Documentation on the wiki

There’s still more…Help help Show a list of commands. Type help <foo> for information about <foo>.

Context cd Move into a new context (object or scope). find-method Recursively search for a method within a Class/Module or the current namespace. fin ls Show the list of vars and methods in the current scope. pry-backtrace Show the backtrace for the Pry session. raise-up Raise an exception out of the current pry instance. reset Reset the REPL to a clean state. whereami Show code surrounding the current context. wtf? Show the backtrace of the most recent exception

Editing ! Clear the input buffer. Useful if the parsing process goes wrong and you get stuck amend-line Amend a line of input in multi-line mode. edit Invoke the default editor on a file. edit-method Edit the source code for a method. hist Show and replay Readline history. Aliases: history play Play back a string variable or a method or a file as input. show-input Show the contents of the input buffer for the current multi-line expression.

Introspection ri View ri documentation. e.g ri Array#each show-command Show the source for CMD. show-source Show the source for a method or class. Aliases: $, show-method stat View method information and set _file_ and _dir_ locals.

Input and output .<shell command> All text following a '.' is forwarded to the shell. cat Show code from a file, Pry's input buffer, or the last exception. save-file Export to a file using content from the REPL. shell-mode Toggle shell mode. Bring in pwd prompt and file completion.

Navigating pry !pry Start a Pry session on current self; this even works mid multi-line expression. exit Pop the previous binding (does NOT exit program). Aliases: quit exit-all End the current Pry session (popping all bindings) and returning to caller. Accepts exit-program End the current program. Aliases: quit-program, !!! jump-to Jump to a binding further up the stack, popping all bindings below. nesting Show nesting information. switch-to Start a new sub-session on a binding in the current stack (numbered by nesting).

Gems gem-cd Change working directory to specified gem's directory. gem-install Install a gem and refresh the gem cache. gem-list List and search installed gems.

Commands import-set Import a command set install-command Install a disabled command.

Aliases !!! Alias for exit-program !!@ Alias for exit-all $ Alias for show-source ? Alias for show-doc breakpoint Alias for break breaks Alias for breakpoints clipit Alias for gist --clip

file-mode Alias for shell-mode history Alias for hist jist Alias for gist quit Alias for exit quit-program Alias for exit-program show-method Alias for show-source

Gist gist Gist a method or expression history to GitHub.

Misc pry-version Show Pry version. reload-method Reload the source file that contains the specified method simple-prompt Toggle the simple prompt. toggle-color Toggle syntax highlighting.

pry-debugger (v0.2.1) break Set or edit a breakpoint. breakpoints List defined breakpoints. continue Continue program execution and end the Pry session. finish Execute until current stack frame returns. next Execute the next line within the current stack frame. step Step execution into the next line or method.

pry-docmore (v0.0.3) show-doc Show the documentation for a method/class/keyword/global. Aliases: ? show-docmores List keywords and vars covered by pry-docmore

pry-exception_explorer (v0.2.3) continue-exception Attempt to continue the current exception. enter-exception Enter the context of the last exception exit-exception Leave the context of the current exception.

pry-popularity (v0.0.3) pry-popularity Sort pry input history by frequency of use

pry-rescue (v0.14) cd-cause Move to the previously raised exception try-again Re-try the code that caused this exception

pry-stack_explorer (v0.4.7) down Go down to the callee's context. frame Switch to a particular frame. show-stack Show all frames up Go up to the caller's context.

*** REMOTE GEMS ***

pry-awesome_print (9.6.5)pry-bot (0.0.1)pry-buffers (1.0.0)pry-capture (1.0)pry-clipboard (0.1.1)pry-coolline (0.1.5)pry-de (0.1.0)pry-debugger (0.2.1)pry-debundle (0.6)pry-developer_tools (0.1.1)pry-disasm (0.0.1)pry-doc (0.4.4)pry-docmore (0.0.3)pry-editline (1.1.1)pry-em (0.2.1)pry-exception_explorer (0.2.3)pry-full (1.2.0)pry-full18 (0.4)pry-gist (5.1.12)pry-git (0.2.3)pry-github (0.0.2)pry-hack (0.1)pry-highlight (0.0.1)pry-multi_debugger (4.8.15)pry-nav (0.2.3)pry-note (0.2.9)pry-padrino (0.1.2)pry-plus (0.2.0)pry-popularity (0.0.3)pry-pretty-numeric (0.1.1)pry-rails (0.2.2)pry-remote (0.1.6)pry-remote-auto (1.1.0)pry-remote-em (0.7.3)pry-rescue (0.14)pry-stack_explorer (0.4.7)pry-syntax-hacks (0.0.6)pry-theme (0.1.3)pry-vterm_aliases (1.0.0)

Thanks!

• Pry– http://pryrepl.org– https://github.com/pry/pry– irc://irc.freenode.net#pry

• Conrad Irwin– http://twitter.com/ConradIrwin– https://github.com/ConradIrwin– irc://irc.freenode.net/cirwin

http://pryrepl.org/

https://github.com/pry/pry

http://twitter.com/ConradIrwin

https://github.com/ConradIrwin

pry, the good parts

Documents

decode64 base64

decode64 strict

decode64 urlsafe

base64 library

encode643 prymain base64

n4 prymain base64

pry1 prymain

encode645 prymain