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‎docs/developer-guide/advanced-topics/renderer-internals.md‎ renamed to ‎docs/developer-guide/advanced-topics/how-renderer-works.md‎

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‎docs/developer-guide/advanced-topics/index.md‎

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---
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description: Learn about the internals that power Lite XL.
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---
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# Advanced Topics
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This section contains deep dives and explainers for core functionalities,
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such as the renderer.
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It is more technical can be a good read for those who want to know Lite XL
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does text rendering, etc.
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## In this section
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| Topic | Description
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| ----- | -----------
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| [How Renderer Works] | Learn how Lite XL makes immediate-mode rendering fast and efficient.
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[How Renderer Works]: ./how-renderer-works.md

‎docs/developer-guide/commands-and-shortcuts/commands.md‎

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description: Learn how to create and call commands programmatically in Lite XL.
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---
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As explained in the User Guide, a lot of Lite XL's functionalities are implemented as commands.
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Each command has a predicate — a condition to check if Lite XL should run the command.
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The predicate will return a boolean and other values to be consumed by the command function.
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‎docs/developer-guide/commands-and-shortcuts/index.md‎

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---
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description: Learn how Lite XL perform tasks with commands and keyboard shortcuts.
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---
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# Commands and Shortcuts
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Most tasks in Lite XL are performed with commands, based on a simple system of
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predicates and user-defined actions.
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Commands can be bound to keyboard shortcuts,
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which will be run when the corresponding keys or mouse buttons are pressed.
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A common idiom used in Lite XL is to listen to `View:on_mouse_moved()`
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and record the item that the cursor is hovering on;
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and then add a command to set the hovered item as the selected item
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when the left-clicks the item.
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This idiom does not require the user to listen to `View:on_mouse_click()` and allows
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unifying the mouse and keyboard handling code.
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## In this section
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| Topic | Description
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| ----- | -----------
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| [Commands] | Learn how to create and call commands programmatically.
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| [Managing Keyboard Shortcuts] | Learn in detail how to add and manage keyboard shortcuts.
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[Commands]: ./commands.md
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[Managing Keyboard Shortcuts]: ./managing-keyboard-shortcuts.md

‎docs/developer-guide/index.md‎

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As such, a lot of concepts used in lite is inherited in Lite XL.
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[Lite: An Implementation Overview][7] is an excellent article that explains many concepts about lite.
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## Types of plugins
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There are a few types of plugins.
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Syntaxes and colors are considered as subset of plugins.
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These subsets of plugins only interact with the syntax highlighter and the `style` table respectively.
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## Interactive debugging
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Other than using GDB to debug the C part of Lite XL, you can also debug the Lua part with [lite-debugger][8].
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Follow [this guide][9] to learn how it works.
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[1]: https://www.lua.org/manual/5.4/
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[2]: https://www.lua.org/pil/
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[3]: https://tylerneylon.com/a/learn-lua/
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[4]: http://www.tutorialspoint.com/lua/lua_overview.htm
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[5]: http://lua-users.org/wiki/LuaTutorial
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[6]: https://github.com/rxi/lite
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[7]: https://rxi.github.io/lite_an_implementation_overview.html
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[8]: https://github.com/lite-xl/lite-xl-plugins/blob/master/plugins/lite-debugger.lua?raw=1
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[9]: ./writing-plugins/debugging.md
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## In this section
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| Topics | Descrption
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| ------ | ----------
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| [Syntaxes and Themes][8] | Learn how Lite XL loads syntax definitions and themes.
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| [Commands and Shortcuts][9] | Learn how Lite XL perform tasks with commands and keyboard shortcuts.
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| [Writing Plugins][10] | Learn how to write plugins for Lite XL.
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| [Using Libraries][11] | Learn how to use library functions in Lite XL.
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| [Samples][12] | View samples of plugins built for Lite XL.
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| [Advanced Topics][13] | Learn about the internals that power Lite XL.
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[1]: https://www.lua.org/manual/5.4/
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[2]: https://www.lua.org/pil/
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[3]: https://tylerneylon.com/a/learn-lua/
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[4]: http://www.tutorialspoint.com/lua/lua_overview.htm
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[5]: http://lua-users.org/wiki/LuaTutorial
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[6]: https://github.com/rxi/lite
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[7]: https://rxi.github.io/lite_an_implementation_overview.html
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[8]: ./syntaxes-and-themes/index.md
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[9]: ./commands-and-shortcuts/index.md
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[10]: ./writing-plugins/index.md
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[11]: ./using-libraries/index.md
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[12]: ./samples/index.md
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[13]: ./advanced-topics/index.md

‎docs/developer-guide/samples/index.md‎

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---
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description: View samples of plugins built for Lite XL.
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---
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# Samples
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This section contains sample plugins to illustrate various features of Lite XL.
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## In this section
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| Topic | Description
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| ----- | -----------
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| [Simple Plugin] | Learn to write a simple plugin that draws text in the top right corner of the editor window.
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| [ToolbarView] | Learn to extend a View in Lite XL for extra functionality.
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[Simple Plugin]: ./simple-plugin.md
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[ToolbarView]: ./toolbarview.md

‎docs/developer-guide/samples/views-toolbarview.md‎ renamed to ‎docs/developer-guide/samples/toolbarview.md‎

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‎docs/developer-guide/syntaxes-and-themes/index.md‎

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---
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description: Learn how Lite XL loads syntax definitions and themes.
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---
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# Syntaxes and Themes
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In Lite XL, adding support for different programming languages is accomplished by adding
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syntax definitions to the tokenizer.
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The highlighter uses the tokenizer to get a stream of tokens, and queries the visual styles
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from the current theme.
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The tokens are then rendered to the window.
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Syntax definition and theme files are Lua files that are loaded during Lite XL initialization.
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Syntax definition calls `syntax.add()` while theme files manipulate the values in the `styles` table.
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## In this section
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| Topic | Description
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| ----- | -----------
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| [Creating Syntaxes] | Learn how to add support for other programming languages.
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| [Creating Themes] | Learn how to create themes.
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[Creating Syntaxes]: ./creating-syntaxes.md
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[Creating Themes]: ./creating-themes.md

‎docs/developer-guide/using-libraries/index.md‎

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---
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description: Learn how to use library functions in Lite XL.
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---
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# Using Libraries
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Lite XL implements most of the functionalities in Lua, but it would be impossible to create
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a window, get input events, or perform various filesystem operations in pure Lua,
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without relying on functions provided by the platform.
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Lite XL has its own bindings to [SDL2], which provides cross-platform abstractions to windowing
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and event handling.
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Other than that Lite XL also uses [PCRE2] to provide support for regular expressions as Lua only
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has a simple pattern-based matching engine.
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Finally, Lite XL provides an API for running starting and managing programs, as well as handling
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the input / output of the program without blocking the editor.
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## In this section
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| Topic | Description
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| ----- | -----------
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| [Using Regular Expressions] | Learn to use regular expressions in plugins or user configuration.
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| [Interacting with the OS] | Learn how to interact with the OS, such as the clipboard and querying high-resolution time.
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| [Child Processes] | Learn how to use the Process API to start and manage child processes.
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[SDL2]: https://libsdl.org
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[PCRE2]: https://www.pcre.org
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[Using Regular Expressions]: ./using-regular-expressions.md
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[Interacting with the OS]: ./interacting-with-the-os.md
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[Child Processes]: ./child-processes.md

‎docs/developer-guide/writing-plugins/index.md‎

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---
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description: Learn how to write plugins for Lite XL.
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---
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# Writing Plugins
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Lite XL allows users to load Lua files to add or modify functionalities of the editor.
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In general, a plugin is a Lua file or a directory that contains an `init.lua` file
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serving as the entrypoint.
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Plugins can load other Lua files or native libraries that can be used to call system functions,
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but are responsible for managing their own dependencies.
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!!! tip
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[Plugin managers] provide dependency resolution capabilities for plugins,
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and automates the installation of native libraries on different platforms.
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If you aren't using a plugin manager, you should definitely consider using one.
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## Overriding existing functionality
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Lite XL heavily uses the idiom of overriding existing function that does a certain task.
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For instance, to run something when the user saves a file, you can override `Doc:save()`
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to add your own functionality before or after calling the original `Doc:save()` function.
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This design makes plugin code generally easier to tinker with, but gets complex when the user
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installs a bunch of plugins that doesn't interact with each other well.
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This is a trade-off [lite] and Lite XL made for the sake of simplicity.
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## Native libraries
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Lite XL, since v2.1.0, supports loading shared libraries
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(also known as dynamically-linked libraries on Windows) to provide functionalities
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that are not available with Lite XL's own native bindings.
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Lite XL uses [Lua's convention] for these libraries, but extends the convention to support
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statically-linked Lua in Lite XL.
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!!! warning
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Using native libraries in v2.1.0 is **not recommended**, as the native plugin API
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was missing several Lua symbols that will cause a crash when called.
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This behavior is fixed in v2.1.1.
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## In this section
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| Topic | Description
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| ----- | -----------
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| [Classes and Objects] | Learn how Lite XL implements OOP in Lua.
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| [Documents] | Learn about how to operate on files opened in the editor.
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| [Views] | Learn about Views, one of the core concepts for building UIs.
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| [Background Tasks] | Learn how to use background tasks to perform long-running operations.
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| [Debugging] | Learn how to debug Lite XL with the debugger plugin, and other related tips.
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[Plugin managers]: ../../user-guide/managing-plugins.md#plugin-managers
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[lite]: https://github.com/rxi/lite
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[Lua's convention]: https://www.lua.org/manual/5.4/manual.html#pdf-package.searchers
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[Classes and Objects]: ./classes-and-objects.md
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[Documents]: ./documents.md
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[Views]: ./views.md
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[Background Tasks]: ./background-tasks.md
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[Debugging]: ./debugging.md

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