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# debug.rb

This library provides debugging functionality to Ruby (MRI) 2.7 and later.

This debug.rb is the replacement of traditional lib/debug.rb standard library, which is implemented by `set_trace_func`.
New debug.rb has several advantages:

* Fast: No performance penalty on non-stepping mode and non-breakpoints.
* [Remote debugging](#remote-debugging): Support remote debugging natively.
  * UNIX domain socket (UDS)
  * TCP/IP
  * Integration with rich debugger frontends

     | Frontend    | [Console](https://github.com/ruby/debug#invoke-as-a-remote-debuggee) | [VSCode](https://github.com/ruby/debug#vscode-integration)                                  | [Chrome DevTool](#chrome-devtool-integration) |
     | ----------- | -------------------------------------------------------------------- | ------------------------------------------------------------------------------------------- | --------------------------------------------- |
     | Connection  | UDS, TCP/IP                                                          | UDS, TCP/IP                                                                                 | TCP/IP                                        |
     | Requirement | No                                                                   | [vscode-rdbg](https://marketplace.visualstudio.com/items?itemName=KoichiSasada.vscode-rdbg) | Chrome                                        |

* Extensible: application can introduce debugging support in several ways:
  * By `rdbg` command
  * By loading libraries with `-r` command line option
  * By calling Ruby's method explicitly
* Misc
  * Support threads (almost done) and ractors (TODO).
  * Support suspending and entering to the console debugging with `Ctrl-C` at most of timing.
  * Show parameters on backtrace command.
  * Support recording & replay debugging.

# Installation

```
$ gem install debug
```

or specify `-Ipath/to/debug/lib` in `RUBYOPT` or each ruby command-line option, especially for debug this gem development.

If you use Bundler, write the following line to your Gemfile.

```
gem "debug", ">= 1.0.0"
```

(The version constraint is important; `debug < 1.0.0` is an older,
abandoned gem that is completely different from this product.)

# HOW TO USE

To use a debugger, roughly you will do the following steps:

1. Set breakpoints.
2. Run a program with the debugger.
3. At the breakpoint, enter the debugger console.
4. Use debug commands.
    * [Evaluate Ruby expressions](#evaluate) (e.g. `p lvar` to see the local variable `lvar`).
    * [Query the program status](#information) (e.g. `info` to see information about the current frame).
    * [Control program flow](#control-flow) (e.g. move to another line with `step`, to the next line with `next`).
    * [Set another breakpoint](#breakpoint) (e.g. `catch Exception` to set a breakpoint that'll be triggered when `Exception` is raised).
    * [Activate tracing in your program](#trace) (e.g. `trace call` to trace method calls).
    * [Change the configuration](#configuration-1) (e.g. `config set no_color true` to disable coloring).
    * Continue the program (`c` or `continue`) and goto 3.

## Invoke with the debugger

There are several options for (1) and (2). Please choose your favorite way.

### Modify source code with [`binding.break`](#bindingbreak-method) (similar to `binding.pry` or `binding.irb`)

If you can modify the source code, you can use the debugger by adding `require 'debug'` at the top of your program and putting [`binding.break`](#bindingbreak-method) method into lines where you want to stop as breakpoints like `binding.pry` and `binding.irb`.

You can also use its 2 aliases in the same way:

- `binding.b`
- `debugger`

After that, run the program as usual and you will enter the debug console at breakpoints you inserted.

The following example shows the demonstration of [`binding.break`](#bindingbreak-method).

```shell
$ cat target.rb                        # Sample program
require 'debug'

a = 1
b = 2
binding.break                          # Program will stop here
c = 3
d = 4
binding.break                          # Program will stop here
p [a, b, c, d]

$ ruby target.rb                       # Run the program normally.
DEBUGGER: Session start (pid: 7604)
[1, 10] in target.rb
      1| require 'debug'
      2|
      3| a = 1
      4| b = 2
=>    5| binding.break                 # Now you can see it stops at this line
      6| c = 3
      7| d = 4
      8| binding.break
      9| p [a, b, c, d]
     10|
=>#0    <main> at target.rb:5

(rdbg) info locals                     # You can show local variables
=>#0    <main> at target.rb:5
%self => main
a => 1
b => 2
c => nil
d => nil

(rdbg) continue                        # Continue the execution
[3, 11] in target.rb
      3| a = 1
      4| b = 2
      5| binding.break
      6| c = 3
      7| d = 4
=>    8| binding.break                 # Again the program stops here
      9| p [a, b, c, d]
     10|
     11| __END__
=>#0    <main> at target.rb:8

(rdbg) info locals                     # And you can see the updated local variables
=>#0    <main> at target.rb:8
%self => main
a => 1
b => 2
c => 3
d => 4

(rdbg) continue
[1, 2, 3, 4]
```

### Invoke the program from the debugger as a traditional debuggers

If you don't want to modify the source code, you can set breakpoints with a debug command `break` (`b` for short).
Using `rdbg` command (or `bundle exec rdbg`) to launch the program without any modifications, you can run the program with the debugger.

```shell
$ cat target.rb                        # Sample program
a = 1
b = 2
c = 3
d = 4
p [a, b, c, d]

$ rdbg target.rb                       # run like `ruby target.rb`
DEBUGGER: Session start (pid: 7656)
[1, 7] in target.rb
=>    1| a = 1
      2| b = 2
      3| c = 3
      4| d = 4
      5| p [a, b, c, d]
      6|
      7| __END__
=>#0    <main> at target.rb:1

(rdbg)
```

`rdbg` command suspends the program at the beginning of the given script (`target.rb` in this case) and you can use debug commands. `(rdbg)` is prompt. Let's set breakpoints on line 3 and line 5 with `break` command (`b` for short).

```shell
(rdbg) break 3                         # set breakpoint at line 3
#0  BP - Line  /mnt/c/ko1/src/rb/ruby-debug/target.rb:3 (line)

(rdbg) b 5                             # set breakpoint at line 5
#1  BP - Line  /mnt/c/ko1/src/rb/ruby-debug/target.rb:5 (line)

(rdbg) break                           # show all registered breakpoints
#0  BP - Line  /mnt/c/ko1/src/rb/ruby-debug/target.rb:3 (line)
#1  BP - Line  /mnt/c/ko1/src/rb/ruby-debug/target.rb:5 (line)
```

You can see that two breakpoints are registered. Let's continue the program by using the `continue` command.

```shell
(rdbg) continue
[1, 7] in target.rb
      1| a = 1
      2| b = 2
=>    3| c = 3
      4| d = 4
      5| p [a, b, c, d]
      6|
      7| __END__
=>#0    <main> at target.rb:3

Stop by #0  BP - Line  /mnt/c/ko1/src/rb/ruby-debug/target.rb:3 (line)

(rdbg)
```

You can see that we can stop at line 3.
Let's see the local variables with the `info` command, and continue.
You can also confirm that the program will suspend at line 5 and you can use the `info` command again.

```shell
(rdbg) info
=>#0    <main> at target.rb:3
%self => main
a => 1
b => 2
c => nil
d => nil

(rdbg) continue
[1, 7] in target.rb
      1| a = 1
      2| b = 2
      3| c = 3
      4| d = 4
=>    5| p [a, b, c, d]
      6|
      7| __END__
=>#0    <main> at target.rb:5

Stop by #1  BP - Line  /mnt/c/ko1/src/rb/ruby-debug/target.rb:5 (line)

(rdbg) info
=>#0    <main> at target.rb:5
%self => main
a => 1
b => 2
c => 3
d => 4

(rdbg) continue
[1, 2, 3, 4]
```

By the way, using `rdbg` command you can suspend your application with `C-c` (SIGINT) and enter the debug console.
It will help if you want to know what the program is doing.

### Use `rdbg` with commands written in Ruby

If you want to run a command written in Ruby like `rake`, `rails`, `bundle`, `rspec`, and so on, you can use `rdbg -c` option.

* Without the `-c` option, `rdbg <name>` means that `<name>` is a Ruby script and invokes it like `ruby <name>` with the debugger.
* With the `-c` option, `rdbg -c <name>` means that `<name>` is a command in `PATH` and simply invokes it with the debugger.

Examples:
* `rdbg -c -- rails server`
* `rdbg -c -- bundle exec ruby foo.rb`
* `rdbg -c -- bundle exec rake test`
* `rdbg -c -- ruby target.rb` is the same as `rdbg target.rb`

NOTE: `--` is needed to separate the command line options for `rdbg` and the invoking command. For example, `rdbg -c rake -T` is recognized like `rdbg -c -T -- rake`. It should be `rdbg -c -- rake -T`.

NOTE: If you want to use bundler (`bundle` command), you need to write `gem debug` line in your `Gemfile`.

### Using VSCode

Like other languages, you can use this debugger on the VSCode.

1. Install [VSCode rdbg Ruby Debugger - Visual Studio Marketplace](https://marketplace.visualstudio.com/items?itemName=KoichiSasada.vscode-rdbg)
2. Open `.rb` file (e.g. `target.rb`)
3. Register breakpoints with "Toggle breakpoint" in the Run menu (or type F9 key)
4. Choose "Start debugging" in "Run" menu (or type F5 key)
5. You will see a dialog "Debug command line" and you can choose your favorite command line you want to run.
6. Chosen command line is invoked with `rdbg -c`, and VSCode shows the details at breakpoints.

Please refer to [Debugging in Visual Studio Code](https://code.visualstudio.com/docs/editor/debugging) for operations on VSCode.

You can configure the extension in `.vscode/launch.json`.
Please see the extension page for more details.

## Remote debugging

You can use this debugger as a remote debugger. For example, it will help in the following situations:

* Your application does not run on TTY, and it is hard to use `binding.pry` or `binding.irb`.
  * Your application is running on a Docker container, and there is no TTY.
  * Your application is running as a daemon.
  * Your application uses pipe for STDIN or STDOUT.
* Your application is running as a daemon and you want to query the running status (checking a backtrace and so on).

You can run your application as a remote debuggee, and the remote debugger console can attach to the debuggee anytime.

### Invoke as a remote debuggee

There are multiple ways to run your program as a debuggee:

| Stop at program start | [`rdbg` option](https://github.com/ruby/debug#rdbg---open-or-rdbg--o-for-short) | [require](https://github.com/ruby/debug#require-debugopen-in-a-program) | [debugger API](https://github.com/ruby/debug#start-by-method) |
| --------------------- | ------------------------------------------------------------------------------- | ----------------------------------------------------------------------- | ------------------------------------------------------------- |
| Yes                   | `rdbg --open`                                                                   | `require "debug/open"`                                                  | `DEBUGGER__.open`                                             |
| No                    | `rdbg --open --nonstop`                                                         | `require "debug/open_nonstop"`                                          | `DEBUGGER__.open(nonstop: true)`                              |

#### `rdbg --open` (or `rdbg -O` for short)

You can run a script with `rdbg --open target.rb` command and run a `target.rb` as a debuggee program. It also opens the network port and suspends at the beginning of `target.rb`.

```shell
$ exe/rdbg --open target.rb
DEBUGGER: Session start (pid: 7773)
DEBUGGER: Debugger can attach via UNIX domain socket (/home/ko1/.ruby-debug-sock/ruby-debug-ko1-7773)
DEBUGGER: wait for debugger connection...
```

By default, `rdbg --open` uses UNIX domain socket and generates the path name automatically (`/home/ko1/.ruby-debug-sock/ruby-debug-ko1-7773` in this case).

You can connect to the debuggee with `rdbg --attach` command (`rdbg -A` for short).

```shell
$ rdbg -A
[1, 7] in target.rb
=>    1| a = 1
      2| b = 2
      3| c = 3
      4| d = 4
      5| p [a, b, c, d]
      6|
      7| __END__
=>#0    <main> at target.rb:1

(rdbg:remote)
```

If there are no other opening ports on the default directory, `rdbg --attach` command chooses the only one opening UNIX domain socket and connects to it. If there are more files, you need to specify the file.

When `rdbg --attach` connects to the debuggee, you can use any debug commands (set breakpoints, continue the program, and so on) like the local debug console. When a debuggee program exits, the remote console will also terminate.

NOTE: If you use the `quit` command, only the remote console exits and the debuggee program continues to run (and you can connect it again). If you want to exit the debuggee program, use `kill` command.

If you want to use TCP/IP for the remote debugging, you need to specify the port and host with `--port` like `rdbg --open --port 12345` and it binds to `localhost:12345`. You can add an optional `--port_range` option to try multiple ports in a reliable way. For example, `rdbg --open --port 12345 --port_range 10` will try to bind to 12345, 12346, 12347, ... until it finds an available port.

```shell

To connect to the debuggee, you need to specify the port.

```shell
$ rdbg --attach 12345
```

If you want to choose the host to bind, you can use `--host` option.
Note that all messages communicated between the debugger and the debuggee are *NOT* encrypted so please use remote debugging carefully.

#### `require 'debug/open'` in a program

If you can modify the program, you can open the debugging port by adding `require 'debug/open'` line in the program.

If you don't want to stop the program at the beginning, you can also use `require 'debug/open_nonstop'`.
Using `debug/open_nonstop` is useful if you want to open a backdoor to the application.
However, it is also dangerous because it can become another vulnerability.
Please use it carefully.

By default, UNIX domain socket is used for the debugging port. To use TCP/IP, you can set the `RUBY_DEBUG_PORT` environment variable.

```shell
$ RUBY_DEBUG_PORT=12345 ruby target.rb
```

### Integration with external debugger frontend

You can attach with external debugger frontend with VSCode and Chrome.

```
$ rdbg --open=[frontend] target.rb
```

will open a debug port and `[frontend]` can attach to the port.

Also `open` command allows opening the debug port.

#### VSCode integration

([vscode-rdbg v0.0.9](https://marketplace.visualstudio.com/items?itemName=KoichiSasada.vscode-rdbg) or later is required)

If you don't run a debuggee Ruby process on VSCode, you can attach it to VSCode later with the following steps.

`rdbg --open=vscode` opens the debug port and tries to invoke the VSCode (`code` command).

```
$ rdbg --open=vscode target.rb
DEBUGGER: Debugger can attach via UNIX domain socket (/tmp/ruby-debug-sock-1000/ruby-debug-ko1-27706)
DEBUGGER: wait for debugger connection...
Launching: code /tmp/ruby-debug-vscode-20211014-27706-gd7e85/ /tmp/ruby-debug-vscode-20211014-27706-gd7e85/README.rb
DEBUGGER: Connected.
```

And it tries to invoke the new VSCode window and VSCode starts attaching to the debuggee Ruby program automatically.

You can also use `open vscode` command in REPL.

```
$ rdbg target.rb
[1, 8] in target.rb
     1|
=>   2| p a = 1
     3| p b = 2
     4| p c = 3
     5| p d = 4
     6| p e = 5
     7|
     8| __END__
=>#0    <main> at target.rb:2
(rdbg) open vscode    # command
DEBUGGER: wait for debugger connection...
DEBUGGER: Debugger can attach via UNIX domain socket (/tmp/ruby-debug-sock-1000/ruby-debug-ko1-28337)
Launching: code /tmp/ruby-debug-vscode-20211014-28337-kg9dm/ /tmp/ruby-debug-vscode-20211014-28337-kg9dm/README.rb
DEBUGGER: Connected.
```

If the machine which runs the Ruby process doesn't have a `code` command, the following message will be shown:

```
(rdbg) open vscode
DEBUGGER: wait for debugger connection...
DEBUGGER: Debugger can attach via UNIX domain socket (/tmp/ruby-debug-sock-1000/ruby-debug-ko1-455)
Launching: code /tmp/ruby-debug-vscode-20211014-455-gtjpwi/ /tmp/ruby-debug-vscode-20211014-455-gtjpwi/README.rb
DEBUGGER: Can not invoke the command.
Use the command-line on your terminal (with modification if you need).

  code /tmp/ruby-debug-vscode-20211014-455-gtjpwi/ /tmp/ruby-debug-vscode-20211014-455-gtjpwi/README.rb

If your application is running on a SSH remote host, please try:

  code --remote ssh-remote+[SSH hostname] /tmp/ruby-debug-vscode-20211014-455-gtjpwi/ /tmp/ruby-debug-vscode-20211014-455-gtjpwi/README.rb

```

and try to use the proposed commands.

Note that you can attach with `rdbg --attach` and continue REPL debugging.

#### Chrome DevTool integration

With `rdbg --open=chrome` command will show the following message.

```
$ rdbg target.rb --open=chrome
DEBUGGER: Debugger can attach via TCP/IP (127.0.0.1:43633)
DEBUGGER: With Chrome browser, type the following URL in the address-bar:

   devtools://devtools/bundled/inspector.html?v8only=true&panel=sources&ws=127.0.0.1:57231/b32a55cd-2eb5-4c5c-87d8-b3dfc59d80ef

DEBUGGER: wait for debugger connection...
```

Type `devtools://devtools/bundled/inspector.html?v8only=true&panel=sources&ws=127.0.0.1:57231/b32a55cd-2eb5-4c5c-87d8-b3dfc59d80ef` in the address bar on Chrome browser, and you can continue the debugging with chrome browser.

Also `open chrome` command works like `open vscode`.

For more information about how to use Chrome debugging, you might want to read [here](https://developer.chrome.com/docs/devtools/).

## Configuration

You can configure the debugger's behavior with debug commands and environment variables.
When the debug session is started, initial scripts are loaded so you can put your favorite configurations in the initial scripts.

### Configuration list

You can configure the debugger's behavior with environment variables and `config` command. Each configuration has an environment variable and a name which can be specified by `config` command.

```
# configuration example
config set log_level INFO
config set no_color true
```

<% cat = nil; DEBUGGER__::CONFIG_SET.each do |key, (env, desc, _, default)| %>
<% /\A(\w+): (.+)/ =~ desc; if cat != $1; cat = 1 %>
* <%= $1 %>
<% cat = $1; end %>  * `<%= env %>` (`<%= key %>`): <%= default ? "#{$2} (default: #{default})" : $2 %><% end %>

There are other environment variables:

* `NO_COLOR`: If the value is set, set `RUBY_DEBUG_NO_COLOR` ([NO_COLOR: disabling ANSI color output in various Unix commands](https://no-color.org/)).
* `RUBY_DEBUG_ENABLE`: If the value is `0`, do not enable debug.gem feature.
* `RUBY_DEBUG_ADDED_RUBYOPT`: Remove this value from `RUBYOPT` at first. This feature helps loading debug.gem with `RUBYOPT='-r debug/...'`, and you don't want to derive it to child processes. In this case, you can set `RUBY_DEBUG_ADDED_RUBYOPT='-r debug/...'` (same value), and this string will be deleted from `RUBYOPT` at first.
* `RUBY_DEBUG_EDITOR` or `EDITOR`: An editor used by `edit` debug command.
* `RUBY_DEBUG_BB`: Define `Kernel#bb` method which is alias of `Kernel#debugger`.

### Initial scripts

If there is `~/.rdbgrc`, the file is loaded as an initial script (which contains debug commands) when the debug session is started.

* `RUBY_DEBUG_INIT_SCRIPT` environment variable can specify the initial script file.
* You can specify the initial script with `rdbg -x initial_script` (like gdb's `-x` option).

Initial scripts are useful to write your favorite configurations.
For example, you can set breakpoints with `break file:123` in `~/.rdbgrc`.

If there are `~/.rdbgrc.rb` is available, it is also loaded as a ruby script at same timing.

## Debug command on the debug console

On the debug console, you can use the following debug commands.

There are additional features:

* `<expr>` without debug command is almost the same as `pp <expr>`.
  * If the input line `<expr>` does *NOT* start with any debug command, the line `<expr>` will be evaluated as a Ruby expression, and the result will be printed with `pp` method. So that the input `foo.bar` is the same as `pp foo.bar`.
  * If `<expr>` is recognized as a debug command, of course, it is not evaluated as a Ruby expression but is executed as debug command. For example, you can not evaluate such single-letter local variables `i`, `b`, `n`, `c` because they are single-letter debug commands. Use `p i` instead.
  * So the author (Koichi Sasada) recommends using `p`, `pp` or `eval` command to evaluate the Ruby expression every time.
* `Enter` without any input repeats the last command (useful when repeating `step`s) for some commands.
* `Ctrl-D` is equal to `quit` command.
* [debug command compare sheet - Google Sheets](https://docs.google.com/spreadsheets/d/1TlmmUDsvwK4sSIyoMv-io52BUUz__R5wpu-ComXlsw0/edit?usp=sharing)

You can use the following debug commands. Each command should be written in 1 line.
The `[...]` notation means this part can be eliminated. For example, `s[tep]` means `s` or `step` is a valid command. `ste` is not valid.
The `<...>` notation means the argument.

<%= DEBUGGER__.help %>

### Using IRB as the Debug Console

Starting from version `v1.9`, you can now use IRB as the debug console. This integration brings additional features such as:

* Autocompletion
* Support for multi-line input
* Access to commands not available in `debug`, like `show_source` or `show_doc`
* [Configurable command aliases](https://docs.ruby-lang.org/en/master/IRB.html#module-IRB-label-Command+Aliases)

To switch to the IRB console, simply use the `irb` command in the debug console.

Once activated, you'll notice the prompt changes to:

```txt
irb:rdbg(main):001>
```

If you want to make IRB the default console for all sessions, configure the `irb_console` setting by either:

* Setting the `RUBY_DEBUG_IRB_CONSOLE=true` environment variable
* Or adding `config set irb_console 1` to your `~/.rdbgrc`

To disable the IRB console in the current session, execute `config set irb_console 0` in the console.

## Debugger API

### Start debugging

#### Start by requiring a library

You can start debugging without `rdbg` command by requiring the following libraries:

* `require 'debug'`: Same as `rdbg --nonstop --no-sigint-hook`.
* `require 'debug/start'`: Same as `rdbg`.
* `require 'debug/open'`: Same as `rdbg --open`.
* `require 'debug/open_nonstop'`: Same as `rdbg --open --nonstop`.

You need to require one of them at the very beginning of the application.
Using `ruby -r` (for example `ruby -r debug/start target.rb`) is another way to invoke with debugger.

NOTE: Until Ruby 3.0, there is old `lib/debug.rb` standard library. So that if this gem is not installed, or if `Gemfile` missed to list this gem and `bundle exec` is used, you will see the following output:

```shell
$ ruby -r debug -e0
.../2.7.3/lib/ruby/2.7.0/x86_64-linux/continuation.so: warning: callcc is obsolete; use Fiber instead
Debug.rb
Emacs support available.

.../2.7.3/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:162:    if RUBYGEMS_ACTIVATION_MONITOR.respond_to?(:mon_owned?)
(rdb:1)
```

`lib/debug.rb` was not maintained well in recent years, and the purpose of this library is to rewrite old `lib/debug.rb` with recent techniques.

#### Start by method

After loading `debug/session`, you can start a debug session with the following methods. They are convenient if you want to specify debug configurations in your program.

* `DEBUGGER__.start(**kw)`: start debug session with local console.
* `DEBUGGER__.open(**kw)`: open debug port with configuration (without configurations open with UNIX domain socket)
* `DEBUGGER__.open_unix(**kw)`: open debug port with UNIX domain socket
* `DEBUGGER__.open_tcp(**kw)`: open debug port with TCP/IP

For example:

```ruby
require 'debug/session'
DEBUGGER__.start(no_color: true,    # disable colorize
                 log_level: 'INFO') # Change log_level to INFO

... # your application code
```

### `binding.break` method

`binding.break` (or `binding.b`) set breakpoints at the written line. It also has several keywords.

If `do: 'command'` is specified, the debugger suspends the program, runs the `command` as a debug command, and continues the program.
It is useful if you only want to call a debug command and don't want to stop there.

```
def initialize
  @a = 1
  binding.b do: 'info \n watch @a'
end
```

In this case, execute the `info` command then register a watch breakpoint for `@a` and continue to run. You can also use `;;` instead of `\n` to separate your commands.

If `pre: 'command'` is specified, the debugger suspends the program and runs the `command` as a debug command, and keeps suspended.
It is useful if you have operations before suspend.

```
def foo
  binding.b pre: 'p bar()'
  ...
end
```

In this case, you can see the result of `bar()` every time you stop there.

## rdbg command help

```
<%= `exe/rdbg --help` %>
```

# Additional Resources

- [From byebug to ruby/debug](https://st0012.dev/from-byebug-to-ruby-debug) by Stan Lo - A migration guide for `byebug` users.
- [ruby/debug cheatsheet](https://st0012.dev/ruby-debug-cheatsheet) by Stan Lo

# Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/ruby/debug.
This debugger is not mature so your feedback will help us.

Please also check the [contributing guideline](/CONTRIBUTING.md).

# Acknowledgement

* Some tests are based on [deivid-rodriguez/byebug: Debugging in Ruby 2](https://github.com/deivid-rodriguez/byebug)
* Several codes in `server_cdp.rb` are based on [geoffreylitt/ladybug: Visual Debugger](https://github.com/geoffreylitt/ladybug)