Convert all commands to classes

John "banister" Mair describes the following key features of commands
as classes:

  1. It enables people to extend them by either subclassing or
     monkeypatching.
  2. It enables them to provide their own API, so that for example, the
     Pry::Command::Edit class could have class methods for people to
     configure it.

Please, note that I didn't touch easter eggs commands. I also prettified
some strings (your source code reading experience should vastly improve!).

Signed-off-by: Kyrylo Silin <kyrylosilin@gmail.com>

lib/pry/commands/amend_line.rb

@@ -1,8 +1,9 @@
 class Pry
-  Pry::Commands.create_command(/amend-line(?: (-?\d+)(?:\.\.(-?\d+))?)?/) do
+  class Command::AmendLine < Pry::ClassCommand
+    match /amend-line(?: (-?\d+)(?:\.\.(-?\d+))?)?/
     group 'Editing'
-    description "Amend a line of input in multi-line mode."
-    command_options :interpolate => false, :listing => "amend-line"
+    description 'Amend a line of input in multi-line mode.'
+    command_options :interpolate => false, :listing => 'amend-line'
 
     banner <<-'BANNER'
       Amend a line of input in multi-line mode. `amend-line N`, where the N in `amend-line N` represents line to replace.
@@ -40,5 +41,7 @@ class Pry
       run "show-input"
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::AmendLine)
 end
 

lib/pry/commands/bang.rb

@@ -1,13 +1,16 @@
 class Pry
-  Pry::Commands.create_command "!" do
+  class Command::Bang < Pry::ClassCommand
+    match '!'
     group 'Editing'
-    description "Clear the input buffer. Useful if the parsing process goes " \
-      "wrong and you get stuck in the read loop."
+    description 'Clear the input buffer. Useful if the parsing process goes ' \
+      'wrong and you get stuck in the read loop.'
     command_options :use_prefix => false
 
     def process
-      output.puts "Input buffer cleared!"
-      eval_string.replace("")
+      output.puts 'Input buffer cleared!'
+      eval_string.replace('')
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::Bang)
 end

lib/pry/commands/bang_pry.rb

@@ -1,11 +1,14 @@
 class Pry
-  Pry::Commands.create_command "!pry" do
+  class Command::BangPry < Pry::ClassCommand
+    match '!pry'
     group 'Navigating Pry'
-    description "Start a Pry session on current self; this even works mid " \
-      "multi-line expression."
+    description 'Start a Pry session on current self; this even works mid ' \
+      'multi-line expression.'
 
     def process
       target.pry
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::BangPry)
 end

lib/pry/commands/cat.rb

@@ -1,5 +1,6 @@
 class Pry
-  Pry::Commands.create_command "cat" do
+  class Command::Cat < Pry::ClassCommand
+    match 'cat'
     group 'Input and Output'
     description "Show code from a file, Pry's input buffer, or the last " \
       "exception."
@@ -175,4 +176,6 @@ class Pry
       end
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::Cat)
 end

lib/pry/commands/cd.rb

@@ -1,7 +1,8 @@
 class Pry
-  Pry::Commands.create_command "cd" do
-    group "Context"
-    description "Move into a new context (object or scope)."
+  class Command::Cd < Pry::ClassCommand
+    match 'cd'
+    group 'Context'
+    description 'Move into a new context (object or scope).'
 
     banner <<-BANNER
       Usage: cd [OPTIONS] [--help]
@@ -25,4 +26,6 @@ class Pry
       _pry_.binding_stack = stack if stack
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::Cd)
 end

lib/pry/commands/disable_pry.rb

@@ -1,5 +1,6 @@
 class Pry
-  Pry::Commands.create_command "disable-pry" do
+  class Command::DisablePry < Pry::ClassCommand
+    match 'disable-pry'
     group 'Navigating Pry'
     description 'Stops all future calls to pry and exits the current session.'
 
@@ -21,4 +22,6 @@ class Pry
       _pry_.run_command "exit"
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::DisablePry)
 end

lib/pry/commands/edit.rb

@@ -6,9 +6,10 @@ class Pry
   #       the entire source code because an exception may happen anywhere in the
   #       code and there is no way to predict that. So we simply superimpose
   #       everything (admittedly, doing extra job).
-  Pry::Commands.create_command "edit" do
+  class Command::Edit < Pry::ClassCommand
+    match 'edit'
     group 'Editing'
-    description "Invoke the default editor on a file."
+    description 'Invoke the default editor on a file.'
 
     banner <<-BANNER
       Usage: edit [--no-reload|--reload] [--line LINE] [--temp|--ex|FILE[:LINE]|--in N]
@@ -175,4 +176,6 @@ class Pry
       end
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::Edit)
 end

lib/pry/commands/edit_method.rb

@@ -1,7 +1,8 @@
 class Pry
-  Pry::Commands.create_command "edit-method" do
+  class Command::EditMethod < Pry::ClassCommand
+    match 'edit-method'
     group 'Editing'
-    description "Edit the source code for a method."
+    description 'Edit the source code for a method.'
 
     banner <<-BANNER
       Usage: edit-method [OPTIONS] [METH]
@@ -177,4 +178,6 @@ class Pry
         source
       end
   end
+
+  Pry::Commands.add_command(Pry::Command::EditMethod)
 end

lib/pry/commands/exit.rb

@@ -1,7 +1,8 @@
 class Pry
-  Pry::Commands.create_command "exit" do
+  class Command::Exit < Pry::ClassCommand
+    match 'exit'
     group 'Navigating Pry'
-    description "Pop the previous binding (does NOT exit program). Aliases: quit"
+    description 'Pop the previous binding (does NOT exit program). Aliases: quit'
 
     banner <<-BANNER
       Usage:   exit [OPTIONS] [--help]
@@ -38,5 +39,6 @@ class Pry
     end
   end
 
-  Pry::Commands.alias_command "quit", "exit"
+  Pry::Commands.add_command(Pry::Command::Exit)
+  Pry::Commands.alias_command 'quit', 'exit'
 end

lib/pry/commands/exit_all.rb

@@ -1,8 +1,9 @@
 class Pry
-  Pry::Commands.create_command "exit-all" do
+  class Command::ExitAll < Pry::ClassCommand
+    match 'exit-all'
     group 'Navigating Pry'
-    description "End the current Pry session (popping all bindings) and " \
-      "returning to caller. Accepts optional return value. Aliases: !!@"
+    description 'End the current Pry session (popping all bindings) and ' \
+      'returning to caller. Accepts optional return value. Aliases: !!@'
 
     def process
       # calculate user-given value
@@ -16,5 +17,6 @@ class Pry
     end
   end
 
-  Pry::Commands.alias_command "!!@", "exit-all"
+  Pry::Commands.add_command(Pry::Command::ExitAll)
+  Pry::Commands.alias_command '!!@', 'exit-all'
 end

lib/pry/commands/exit_program.rb

@@ -1,7 +1,8 @@
 class Pry
-  Pry::Commands.create_command "exit-program" do
+  class Command::ExitProgram < Pry::ClassCommand
+    match 'exit-program'
     group 'Navigating Pry'
-    description "End the current program. Aliases: quit-program, !!!"
+    description 'End the current program. Aliases: quit-program, !!!'
 
     def process
       Pry.save_history if Pry.config.history.should_save
@@ -9,6 +10,7 @@ class Pry
     end
   end
 
-  Pry::Commands.alias_command "quit-program", "exit-program"
-  Pry::Commands.alias_command "!!!", "exit-program"
+  Pry::Commands.add_command(Pry::Command::ExitProgram)
+  Pry::Commands.alias_command 'quit-program', 'exit-program'
+  Pry::Commands.alias_command '!!!', 'exit-program'
 end

lib/pry/commands/find_method.rb

@@ -1,13 +1,13 @@
 class Pry
-  Pry::Commands.create_command "find-method" do
+  class Command::FindMethod < Pry::ClassCommand
     extend Pry::Helpers::BaseHelpers
 
-    group "Context"
-
-    options :requires_gem => "ruby18_source_location" if mri_18?
+    match 'find-method'
+    group 'Context'
+    options :requires_gem => 'ruby18_source_location' if mri_18?
     options :shellwords => false
 
-    description "Recursively search for a method within a Class/Module or the current namespace. find-method [-n | -c] METHOD [NAMESPACE]"
+    description 'Recursively search for a method within a Class/Module or the current namespace. find-method [-n | -c] METHOD [NAMESPACE]'
 
     banner <<-BANNER
       Usage: find-method  [-n | -c] METHOD [NAMESPACE]
@@ -162,4 +162,6 @@ class Pry
       end
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::FindMethod)
 end

lib/pry/commands/gem_cd.rb

@@ -1,5 +1,6 @@
 class Pry
-  Pry::Commands.create_command "gem-cd" do |gem|
+  class Command::GemCd < Pry::ClassCommand
+    match 'gem-cd'
     group 'Gems'
     description "Change working directory to specified gem's directory."
     command_options :argument_required => true
@@ -19,4 +20,6 @@ class Pry
       gem_complete(str)
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::GemCd)
 end

lib/pry/commands/gem_install.rb

@@ -1,7 +1,8 @@
 class Pry
-  Pry::Commands.create_command "gem-install" do |gem|
+  class Command::GemInstall < Pry::ClassCommand
+    match 'gem-install'
     group 'Gems'
-    description "Install a gem and refresh the gem cache."
+    description 'Install a gem and refresh the gem cache.'
     command_options :argument_required => true
 
     banner <<-BANNER
@@ -30,4 +31,6 @@ class Pry
       end
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::GemInstall)
 end

lib/pry/commands/gem_list.rb

@@ -1,7 +1,8 @@
 class Pry
-  Pry::Commands.create_command "gem-list" do |pattern|
+  class Command::GemList < Pry::ClassCommand
+    match 'gem-list'
     group 'Gems'
-    description "List and search installed gems."
+    description 'List and search installed gems.'
 
     banner <<-BANNER
       Usage: gem-list [REGEX]
@@ -10,7 +11,7 @@ class Pry
       match the regex.
     BANNER
 
-    def process(pattern=nil)
+    def process(pattern = nil)
       pattern = Regexp.compile(pattern || '')
       gems    = gem_list(pattern).group_by(&:name)
 
@@ -27,4 +28,6 @@ class Pry
       end
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::GemList)
 end

lib/pry/commands/gem_open.rb

@@ -1,7 +1,8 @@
 class Pry
-  Pry::Commands.create_command "gem-open" do |gem|
+  class Command::GemOpen < Pry::ClassCommand
+    match 'gem-open'
     group 'Gems'
-    description "Opens the working directory of the gem in your editor"
+    description 'Opens the working directory of the gem in your editor'
     command_options :argument_required => true
 
     banner <<-BANNER
@@ -21,4 +22,6 @@ class Pry
       gem_complete(str)
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::GemOpen)
 end

lib/pry/commands/gist.rb

@@ -28,9 +28,10 @@ class Pry
     end
   end
 
-  Pry::Commands.create_command "gist" do
+  class Command::Gist < Pry::ClassCommand
     include Pry::Helpers::DocumentationHelpers
 
+    match 'gist'
     group 'Misc'
     description Pry::Gist::DESCRIPTION
     command_options :requires_gem => 'jist', :shellwords => false
@@ -192,6 +193,7 @@ class Pry
 
   end
 
-  Pry::Commands.alias_command "clipit", "gist --clip"
-  Pry::Commands.alias_command "jist", "gist"
+  Pry::Commands.add_command(Pry::Command::Gist)
+  Pry::Commands.alias_command 'clipit', 'gist --clip'
+  Pry::Commands.alias_command 'jist', 'gist'
 end

lib/pry/commands/help.rb

@@ -1,7 +1,8 @@
 class Pry
-  Pry::Commands.create_command "help" do |cmd|
+  class Command::Help < Pry::ClassCommand
+    match 'help'
     group 'Help'
-    description "Show a list of commands. Type `help <foo>` for information about <foo>."
+    description 'Show a list of commands. Type `help <foo>` for information about <foo>.'
 
     banner <<-BANNER
       Usage: help [ COMMAND ]
@@ -121,4 +122,6 @@ class Pry
       [%w(Help Context Editing Introspection Input_and_output Navigating_pry Gems Basic Commands).index(group_name.gsub(' ', '_')) || 99, group_name]
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::Help)
 end

lib/pry/commands/hist.rb

@@ -1,7 +1,8 @@
 class Pry
-  Pry::Commands.create_command "hist" do
-    group "Editing"
-    description "Show and replay Readline history. Aliases: history"
+  class Command::Hist < Pry::ClassCommand
+    match 'hist'
+    group 'Editing'
+    description 'Show and replay Readline history. Aliases: history'
 
     banner <<-USAGE
       Usage: hist
@@ -153,5 +154,6 @@ class Pry
     end
   end
 
-  Pry::Commands.alias_command "history", "hist"
+  Pry::Commands.add_command(Pry::Command::Hist)
+  Pry::Commands.alias_command 'history', 'hist'
 end

lib/pry/commands/import_set.rb

@@ -1,7 +1,10 @@
 class Pry
-  Pry::Commands.create_command "import-set" do
-    group "Commands"
-    description "Import a command set."
+  class Command::ImportSet < Pry::ClassCommand
+    match 'import-set'
+    group 'Commands'
+    # TODO: Provide a better description with examples and a general conception
+    # of this command.
+    description 'Import a Pry command set.'
 
     def process(command_set_name)
       raise CommandError, "Provide a command set name" if command_set.nil?
@@ -10,4 +13,6 @@ class Pry
       _pry_.commands.import set
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::ImportSet)
 end

lib/pry/commands/install_command.rb

@@ -1,7 +1,8 @@
 class Pry
-  Pry::Commands.create_command "install-command" do
+  class Command::InstallCommand < Pry::ClassCommand
+    match 'install-command'
     group 'Commands'
-    description "Install a disabled command."
+    description 'Install a disabled command.'
 
     banner <<-BANNER
       Usage: install-command COMMAND
@@ -45,4 +46,6 @@ class Pry
       output.puts "Installation of `#{name}` successful! Type `help #{name}` for information"
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::InstallCommand)
 end

lib/pry/commands/jump_to.rb

@@ -1,8 +1,9 @@
 class Pry
-  Pry::Commands.create_command "jump-to" do
+  class Command::JumpTo < Pry::ClassCommand
+    match 'jump-to'
     group 'Navigating Pry'
-    description "Jump to a binding further up the stack, popping all " \
-      "bindings below."
+    description 'Jump to a binding further up the stack, popping all ' \
+      'bindings below.'
 
     def process(break_level)
       break_level = break_level.to_i
@@ -20,4 +21,6 @@ class Pry
       end
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::JumpTo)
 end

lib/pry/commands/ls.rb

@@ -1,7 +1,8 @@
 class Pry
-  Pry::Commands.create_command "ls" do
-    group "Context"
-    description "Show the list of vars and methods in the current scope."
+  class Command::Ls < Pry::ClassCommand
+    match 'ls'
+    group 'Context'
+    description 'Show the list of vars and methods in the current scope.'
     command_options :shellwords => false, :interpolate => false
 
     def options(opt)
@@ -320,4 +321,6 @@ class Pry
       text.send(Pry.config.ls.send(:"#{type}_color"), str)
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::Ls)
 end

lib/pry/commands/nesting.rb

@@ -1,11 +1,12 @@
 class Pry
-  Pry::Commands.create_command "nesting" do
+  class Command::Nesting < Pry::ClassCommand
+    match 'nesting'
     group 'Navigating Pry'
-    description "Show nesting information."
+    description 'Show nesting information.'
 
     def process
-      output.puts "Nesting status:"
-      output.puts "--"
+      output.puts 'Nesting status:'
+      output.puts '--'
       _pry_.binding_stack.each_with_index do |obj, level|
         if level == 0
           output.puts "#{level}. #{Pry.view_clip(obj.eval('self'))} (Pry top level)"
@@ -15,4 +16,6 @@ class Pry
       end
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::Nesting)
 end

lib/pry/commands/play.rb

@@ -1,9 +1,10 @@
 class Pry
-  Pry::Commands.create_command "play" do
+  class Command::Play < Pry::ClassCommand
     include Pry::Helpers::DocumentationHelpers
 
+    match 'play'
     group 'Editing'
-    description "Play back a string variable or a method or a file as input."
+    description 'Play back a string variable or a method or a file as input.'
 
     banner <<-BANNER
       Usage: play [OPTIONS] [--help]
@@ -115,6 +116,7 @@ class Pry
       self.content << File.read(_pry_.last_file)
       self.content = restrict_to_lines(self.content, lines)
     end
-
   end
+
+  Pry::Commands.add_command(Pry::Command::Play)
 end

lib/pry/commands/pry_backtrace.rb

@@ -1,7 +1,8 @@
 class Pry
-  Pry::Commands.create_command "pry-backtrace" do
+  class Command::PryBacktrace < Pry::ClassCommand
+    match 'pry-backtrace'
     group 'Context'
-    description "Show the backtrace for the Pry session."
+    description 'Show the backtrace for the Pry session.'
 
     banner <<-BANNER
       Usage:   pry-backtrace [OPTIONS] [--help]
@@ -21,4 +22,6 @@ class Pry
       stagger_output _pry_.backtrace.join("\n")
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::PryBacktrace)
 end

lib/pry/commands/pry_version.rb

@@ -1,10 +1,13 @@
 class Pry
-  Pry::Commands.create_command "pry-version" do
+  class Command::Version < Pry::ClassCommand
+    match 'pry-version'
     group 'Misc'
-    description "Show Pry version."
+    description 'Show Pry version.'
 
     def process
       output.puts "Pry version: #{Pry::VERSION} on Ruby #{RUBY_VERSION}."
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::Version)
 end

lib/pry/commands/raise_up.rb

@@ -1,8 +1,9 @@
 class Pry
   # N.B. using a regular expresion here so that "raise-up 'foo'" does the right thing.
-  Pry::Commands.create_command(/raise-up(!?\b.*)/) do
+  class Command::RaiseUp < Pry::ClassCommand
+    match /raise-up(!?\b.*)/
     group 'Context'
-    description "Raise an exception out of the current pry instance."
+    description 'Raise an exception out of the current pry instance.'
     command_options :listing => 'raise-up'
 
     banner <<-BANNER
@@ -23,4 +24,6 @@ class Pry
       target.eval("_pry_.raise_up#{captures[0]}")
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::RaiseUp)
 end

lib/pry/commands/reload_method.rb

@@ -1,7 +1,8 @@
 class Pry
-  Pry::Commands.create_command "reload-method" do
+  class Command::ReloadMethod < Pry::ClassCommand
+    match 'reload-method'
     group 'Misc'
-    description "Reload the source file that contains the specified method"
+    description 'Reload the source file that contains the specified method'
 
     def process(meth_name)
       meth = get_method_or_raise(meth_name, target, {}, :omit_help)
@@ -17,4 +18,6 @@ class Pry
       end
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::ReloadMethod)
 end

lib/pry/commands/reset.rb

@@ -1,11 +1,14 @@
 class Pry
-  Pry::Commands.create_command "reset" do
+  class Command::Reset < Pry::ClassCommand
+    match 'reset'
     group 'Context'
-    description "Reset the REPL to a clean state."
+    description 'Reset the REPL to a clean state.'
 
     def process
-      output.puts "Pry reset."
-      exec "pry"
+      output.puts 'Pry reset.'
+      exec 'pry'
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::Reset)
 end

lib/pry/commands/ri.rb

@@ -1,7 +1,8 @@
 class Pry
-  Pry::Commands.create_command "ri" do
+  class Command::Ri < Pry::ClassCommand
+    match 'ri'
     group 'Introspection'
-    description "View ri documentation. e.g `ri Array#each`"
+    description 'View ri documentation. e.g `ri Array#each`'
 
     banner <<-BANNER
       Usage: ri [spec]
@@ -48,4 +49,6 @@ class Pry
       end
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::Ri)
 end

lib/pry/commands/save_file.rb

@@ -1,7 +1,8 @@
 class Pry
-  Pry::Commands.create_command "save-file" do
+  class Command::SaveFile < Pry::ClassCommand
+    match 'save-file'
     group 'Input and Output'
-    description "Export to a file using content from the REPL."
+    description 'Export to a file using content from the REPL.'
 
     banner <<-USAGE
       Usage: save-file [OPTIONS] [FILE]
@@ -96,4 +97,6 @@ class Pry
       end
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::SaveFile)
 end

lib/pry/commands/shell_command.rb

@@ -1,8 +1,9 @@
 class Pry
-  Pry::Commands.create_command(/\.(.*)/) do
+  class Command::ShellCommand < Pry::ClassCommand
+    match /\.(.*)/
     group 'Input and Output'
     description "All text following a '.' is forwarded to the shell."
-    command_options :listing => ".<shell command>", :use_prefix => false,
+    command_options :listing => '.<shell command>', :use_prefix => false,
       :takes_block => true
 
     def process(cmd)
@@ -28,4 +29,6 @@ class Pry
       super + Bond::Rc.files(search.split(" ").last || '')
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::ShellCommand)
 end

lib/pry/commands/shell_mode.rb

@@ -1,7 +1,8 @@
 class Pry
-  Pry::Commands.create_command "shell-mode" do
+  class Command::ShellMode < Pry::ClassCommand
+    match 'shell-mode'
     group 'Input and Output'
-    description "Toggle shell mode. Bring in pwd prompt and file completion."
+    description 'Toggle shell mode. Bring in pwd prompt and file completion.'
 
     def process
       case _pry_.prompt
@@ -17,5 +18,6 @@ class Pry
     end
   end
 
-  Pry::Commands.alias_command "file-mode", "shell-mode"
+  Pry::Commands.add_command(Pry::Command::ShellMode)
+  Pry::Commands.alias_command 'file-mode', 'shell-mode'
 end

lib/pry/commands/show_command.rb

@@ -1,7 +1,8 @@
 class Pry
-  Pry::Commands.create_command "show-command" do
+  class Command::ShowCommand < Pry::ClassCommand
+    match 'show-command'
     group 'Introspection'
-    description "Show the source for CMD."
+    description 'Show the source for CMD.'
 
     def process(*args)
       target = target()
@@ -19,4 +20,6 @@ class Pry
       render_output opts.banner
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::ShowCommand)
 end

lib/pry/commands/show_doc.rb

@@ -1,12 +1,13 @@
 class Pry
-  Pry::Commands.create_command "show-doc" do
+  class Command::ShowDoc < Pry::ClassCommand
     include Pry::Helpers::DocumentationHelpers
     extend  Pry::Helpers::BaseHelpers
 
+    match 'show-doc'
     group 'Introspection'
-    description "Show the documentation for a method or class. Aliases: \?"
+    description 'Show the documentation for a method or class. Aliases: \?'
     command_options :shellwords => false
-    command_options :requires_gem => "ruby18_source_location" if mri_18?
+    command_options :requires_gem => 'ruby18_source_location' if mri_18?
 
     banner <<-BANNER
       Usage: show-doc [OPTIONS] [METH]
@@ -174,5 +175,6 @@ class Pry
     end
   end
 
-  Pry::Commands.alias_command "?", "show-doc"
+  Pry::Commands.add_command(Pry::Command::ShowDoc)
+  Pry::Commands.alias_command '?', 'show-doc'
 end

lib/pry/commands/show_input.rb

@@ -1,10 +1,13 @@
 class Pry
-  Pry::Commands.create_command "show-input" do
+  class Command::ShowInput < Pry::ClassCommand
+    match 'show-input'
     group 'Editing'
-    description "Show the contents of the input buffer for the current multi-line expression."
+    description 'Show the contents of the input buffer for the current multi-line expression.'
 
     def process
       output.puts Code.new(eval_string).with_line_numbers
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::ShowInput)
 end

lib/pry/commands/show_source.rb

@@ -1,9 +1,10 @@
 class Pry
-  Pry::Commands.create_command "show-source" do
+  class Command::ShowSource < Pry::ClassCommand
     extend  Pry::Helpers::BaseHelpers
 
+    match 'show-source'
     group 'Introspection'
-    description "Show the source for a method or class. Aliases: $, show-method"
+    description 'Show the source for a method or class. Aliases: $, show-method'
 
     banner <<-BANNER
       Usage: show-source [OPTIONS] [METH|CLASS]
@@ -130,6 +131,7 @@ class Pry
     end
   end
 
-  Pry::Commands.alias_command "show-method", "show-source"
-  Pry::Commands.alias_command "$", "show-source"
+  Pry::Commands.add_command(Pry::Command::ShowSource)
+  Pry::Commands.alias_command 'show-method', 'show-source'
+  Pry::Commands.alias_command '$', 'show-source'
 end

lib/pry/commands/simple_prompt.rb

@@ -1,7 +1,8 @@
 class Pry
-  Pry::Commands.create_command "simple-prompt" do
+  class Command::SimplePrompt < Pry::ClassCommand
+    match 'simple-prompt'
     group 'Misc'
-    description "Toggle the simple prompt."
+    description 'Toggle the simple prompt.'
 
     def process
       case _pry_.prompt
@@ -12,4 +13,6 @@ class Pry
       end
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::SimplePrompt)
 end

lib/pry/commands/stat.rb

@@ -1,7 +1,8 @@
 class Pry
-  Pry::Commands.create_command "stat" do
+  class Command::Stat < Pry::ClassCommand
+    match 'stat'
     group 'Introspection'
-    description "View method information and set _file_ and _dir_ locals."
+    description 'View method information and set _file_ and _dir_ locals.'
     command_options :shellwords => false
 
     banner <<-BANNER
@@ -32,4 +33,6 @@ class Pry
       EOS
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::Stat)
 end

lib/pry/commands/switch_to.rb

@@ -1,8 +1,9 @@
 class Pry
-  Pry::Commands.create_command "switch-to" do
+  class Command::SwitchTo < Pry::ClassCommand
+    match 'switch-to'
     group 'Navigating Pry'
-    description "Start a new sub-session on a binding in the current stack " \
-      "(numbered by nesting)."
+    description 'Start a new subsession on a binding in the current stack ' \
+      '(numbered by nesting).'
 
     def process(selection)
       selection = selection.to_i
@@ -14,4 +15,6 @@ class Pry
       end
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::SwitchTo)
 end

lib/pry/commands/toggle_color.rb

@@ -1,11 +1,14 @@
 class Pry
-  Pry::Commands.create_command "toggle-color" do
+  class Command::ToggleColor < Pry::ClassCommand
+    match 'toggle-color'
     group 'Misc'
-    description "Toggle syntax highlighting."
+    description 'Toggle syntax highlighting.'
 
     def process
       Pry.color = !Pry.color
       output.puts "Syntax highlighting #{Pry.color ? "on" : "off"}"
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::ToggleColor)
 end

lib/pry/commands/whereami.rb

@@ -1,7 +1,9 @@
 class Pry
-  Pry::Commands.create_command "whereami" do
-    description "Show code surrounding the current context."
+  class Command::Whereami < Pry::ClassCommand
+    match 'whereami'
+    description 'Show code surrounding the current context.'
     group 'Context'
+
     banner <<-BANNER
       Usage: whereami [-q] [N]
 
@@ -84,4 +86,6 @@ class Pry
       end
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::Whereami)
 end

lib/pry/commands/wtf.rb

@@ -1,7 +1,8 @@
 class Pry
-  Pry::Commands.create_command(/wtf([?!]*)/) do
+  class Command::Wtf < Pry::ClassCommand
+    match /wtf([?!]*)/
     group 'Context'
-    description "Show the backtrace of the most recent exception"
+    description 'Show the backtrace of the most recent exception'
     options :listing => 'wtf?'
 
     banner <<-BANNER
@@ -35,4 +36,6 @@ class Pry
       end
     end
   end
+
+  Pry::Commands.add_command(Pry::Command::Wtf)
 end