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With the Simple Orca Plugin System (SOPS) you can extend the functionality of the Orca screen reader. It offers the possibility to add plug-ins in nearly any programming language in an easy way. The settings for the plug-ins are controlled via the filename. ## Contents * [1 Installation](#Installation) * [2 Setup](#Setup) * [3 Administration](#Administration) * [3.1 Basics](#Basics) * [3.2 Administration tools](#Administration_tools) * [4 Plug-ins](#Plug-ins) * [4.1 Structure of the filename](#Structure_of_the_filename) * [4.2 Run a plug-in](#Run_a_plug-in) * [4.2.1 Modifiers/ Shortcuts](#Modifiers.2F_Shortcuts) * [4.2.1.1 Valid shortcuts](#Valid_shortcuts) * [4.2.2 Commands/ Preferences](#Commands.2F_Preferences) * [4.2.3 Examples](#Examples) * [4.3 Types of plug-ins](#Types_of_plug-ins) * [4.3.1 Sub process plug-ins](#Sub_process_plug-ins) * [4.3.1.1 Requirements](#Requirements) * [4.3.1.2 Example](#Example) * [4.3.2 Advanced plug-ins](#Advanced_plug-ins) * [4.3.2.1 Requirements](#Requirements_2) * [4.3.2.2 Example](#Example_2) * [5 Plug-in hosting](#Plug-in_hosting) ## Installation Just [Install](/index.php/Install "Install") the package [simpleorcapluginsystem-git](https://aur.archlinux.org/packages/simpleorcapluginsystem-git/) from the [AUR](/index.php/AUR "AUR"). ## Setup To setup the plug-in system for the current user, run: `$ */usr/share/SOPS/install-for-current-user.sh*` ## Administration ### Basics * The Installation path. This contains the default plug-ins, the documentation,the plugin loader and the administration tools: `/usr/share/SOPS/` * The path for user plug-ins is: `~/.config/SOPS/plugins-available/` * The following path is used for all enabled (active) plug-ins. All plug-ins in that folder will be loaded, if they are valid: `~/.config/SOPS/plugins-enabled/` ### Administration tools The tools are located in the "tools" folder beneath the installation directory. The following command enables/activates a plug-in, but you have to rename the filename to create a shortcut and pass a command to the plug-in: ``` $ *./ensop <pluginname>* ``` The command to disable and unload a plug-in is: ``` $ *./dissop <pluginname>* ``` Both commands basically just create or delete links in `~./.config/SOPSP/plugins-enabled` and make the plug-ins executable. You have to configure the plug-ins manually. Restart Orca to reload the plug-ins after changes. SOPS also provides a plug-in manager, it is available after the installation. To open the plug-in manager use `orca+ctrl+p` while Orca is running. It can be used to activate, deactivate, install or configure plug-ins. Orca gets re-started automatically after closing the plug-in manager. ## Plug-ins **Tip:** You can find some fully predefined example plugins in `/usr/share/SOPS/examples`. ### Structure of the filename The shortcut, plug-in type and preference of a plug-in are controlled by its filename. The descriptive part of the filename has to be separated from the preferences part with `__-__`. The commands, modifier and the key has to be separated by `__+__`. ``` <description>__-__[<command>__+__command...][__+__<modifier>__+__<modifier>__+__key_<key>].ext ``` ### Run a plug-in There are two different ways to run a plug-in: * shortcut (See [#Modifiers/ Shortcuts](#Modifiers.2F_Shortcuts)) * exec run once when the plug-in loads. (See [#Commands/ Preferences](#Commands.2F_Preferences)) If none of those are present. the plug-in does not load. There are some more [#Commands](#Commands) to control the behaviour of a plug-in. #### Modifiers/ Shortcuts With modifiers you can set different shortcut combinations for a `key`. You always have to press the Orca-modifier. The order of the three modifier keys does not matter: * `control` is the modifier for the `ctrl` key on the keyboard * `shift` is the modifier for the `shift` key on the keyboard * `alt` is the modifier for the `alt` key on the keyboard * `key_<key>` defines the basic shortcut that is used for the plug-in, maybe together with the defined modifiers (example_plugin__-__key_d.sh uses `orca+d`). ##### Valid shortcuts Only a few combinations of modifiers are valid. Those are predefined by Orca. Valid combinations are: * `alt` i.e. `description__-__alt__+__key_y.sh` * `control` i.e. `description__-__control__+__key_b.sh` * `shift` i.e. `description__-__shift__+__key_c.sh` * `control + alt` i.e. `description__-__control__+__alt__+__key_w.py` * `shift + alt` i.e. `description__-__shift__+__alt__+__key_y.sh` As `key_<key>` you can use every alphanumerical key. #### Commands/ Preferences Preferences for plug-ins are called commands. A command defines the action to pass to the plug-in. With commands you control the behaviour of the plug-ins. You may add more than one command. The order of the commands does not matter. You can use them mostly for all kinds of plug-ins. * `startnotify` announces "start <description>" before the plug-in is executed. It is useful as feedback for plug-ins with longer progress times. (all plug-ins) * `stopnotify` announces "finish <description>". This is useful as feedback for plug-ins with no output. (all plugins) * `blockcall` do not start the plug-in in a thread. Be careful, as this locks Orca until the plug-in is finished. By default, plug-ins each run in a dedicated thread. (all plug-ins) * `error` announces returned errors. (all plug-ins) * `supressoutput` ignores the output of STDOUT. This is useful for plugins that may have a UI and do not pass output to STDOUT. (sub process plug-in only) * `parameters_<parameter1> [parameter2] [parameter3]...` passes the parameters to the plug-in. (sub process plug-in only) * `exec` run the plug-in once while loading it. Mostly useful as advanced-plug-in. (all plug-ins) * `loadmodule` does not load as a sub process plug-in but loads it as advanced plug-in. (advanced plug-in only) #### Examples * `Plugin name__-__startnotify__+__control__+__alt__+__key_n.sh` Run with `orca+ctrl+alt+n` and announce the start of the process. * `PluginName__-__error__+__stopnotify__+__shift__+__key_y.py` Run with `orca+shift+m` and announce the finishing. Does also read occurring errors . * `Plugin_Name__-__key_m.py` Run with `orca+m` * `Plugin_Name__-__exec.py` Run once at starting Orca. ### Types of plug-ins Basically there are two different types of plugins. #### Sub process plug-ins Sub process plug-ins are simple plug-ins and the default type. They may be any type of application or script that writes to STDOUT or STDERR. Orca executes the plug-in, reads from STDOUT/ STDERR and announces the result to the user, when the defined shortcut is pressed or the plug-in is executed via `exec` while starting screen reader. ##### Requirements * Execution permission * `key_<key>` or `exec` have to be defined in the filename. ##### Example Say "Hello World when pressing `orca+y`: Filename:`Hello_world__-__key_y.sh` ``` *#!/bin/sh* echo "Hello World" ``` #### Advanced plug-ins Those type of plug-ins are loaded with the spec.loader.exec_module. you can load them by using `loadmodule` in the filename. They are fully included into Orca as soon as it starts. Advanced plug-ins are more powerful, because you are able to work in the Orca context. They are mostly similar to the `orca-customizations.py`. See also for "real" Orca scripting: [https://wiki.gnome.org/Projects/Orca/FrequentlyAskedQuestions/CustomizingOrca](https://wiki.gnome.org/Projects/Orca/FrequentlyAskedQuestions/CustomizingOrca) ##### Requirements * Correct code written in python3 * Fileextension `.py` * Use `loadmodule` in the filename * `key_<key>` or `exec` have to been defined in filename ##### Example Configure Orca to speak/braille the word "bang" instead of the "!" while loading the plug-in. Filename:`replace_chnames__-__loadmodule__+__exec.py` ``` *import orca.orca* orca.chnames.chnames["!"] = "bang" ``` ## Plug-in hosting You can also host plug-ins, making them available for installation via the plug-in manager. If you want to Host plug-ins, read: `/usr/share/SOPS/tools/hosting.txt` The default online resource is: [https://stormdragon.tk/orca-plugins/index.php](https://stormdragon.tk/orca-plugins/index.php)