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Hob - Scope Code Generator


Hob is a multi-language code generator for the Opera Scope Protocol. It generates code from Google Protocol Buffer files (.proto), which describes the services, messages, commands and events.

The Scope Protocol is an RPC system used in the Opera web browser. This allows external and embedded clients to debug, inspect or perform other operations on any running Opera instance.

Hob consists of the following components:

  • The hob command line tool which is used to generate code and other output formats.
  • A library for working with Google Protocol Buffer definitions. It can read .proto files and has classes and functions for working with protobuf elements.
  • Support for third party extensions which can add additional commands.


If you install hob using easy_install or pip these dependencies will be installed automatically.


Hob can be installed with pip (or easy_install) using:

pip install hob

Visit for more details on current and earlier releases.


    usage: hob [-h] [-v] [--verbose] [--quiet] [-c CONFIG_FILE] [-t TARGET]
               [--project PROJECT] [-w [WARNING [WARNING ...]]] [--pdb]
               [--profile FILE]
               command ...

        xml                 Generate XML structures of protocol definitions
        proto               Generate Protocol Buffer definitions
        js                  Create service interfaces for JavaScript. If no files
                            are specified, the following files will be added in
                            the 'service' folder:,
                   Files can also be specified
                            with the service name, e.g. just ecmascript-debugger.
                   and will always be added.
        extensions          Lists all enabled extensions
        rst-doc             Create reST documentation of selected services. If no
                            files are specified all services are added.
        validate            Validates services, commands, events, messages and
                            fields according to the style guide
        config              Displays the current config. This is the result of all
                            loaded config and project files as well as overrides
                            from the command-line.

      -h, --help            show this help message and exit
      -v, --version         show program's version number and exit
      --verbose             increase verbosity
      --quiet               be silent
      -c CONFIG_FILE, --config-file CONFIG_FILE
                            use specific config file instead of system-wide/local
                            config files
      -t TARGET, --target TARGET
                            specify target configuration to use (overrides config
      --project PROJECT     specifies project name or file to use (hob.project)
      -w [WARNING [WARNING ...]], --warning [WARNING [WARNING ...]]
                            enable a warning flag, pick from all, field-id-gap,
      --pdb                 start python debugger on exceptions
      --profile FILE        profile a command using the python profiler, writes
                            result to specified file


See the Changelog page.


Hob is maintained by the Opera Dragonfly team. The authors are:

  • Jan Borsodi <jborsodi at opera dot com>
  • Christian Krebs <chrisk opera dot com>

Additional help from:

  • Johannes Hoff <jhoff at opera dot com>
  • Rune Halvorsen <runeh at opera dot com>
  • Anders Hartvoll Ruud <andersr at opera dot com>


See the LICENSE file in the top distribution directory.