ReaScript

ReaScript is the scripting component of Cockos REAPER, a digital audio workstation. It provides a programmable interface that lets users automate tasks, customize workflows, and extend REAPER's functionality by writing scripts in EEL, Lua, or Python. ReaScripts can manipulate tracks, items, envelopes, markers, and other project data, control playback and rendering, query and modify state, and interact with the user interface.

The supported languages are EEL, Lua, and Python. EEL is REAPER's native, lightweight language; Lua is widely used for its readability and cross-platform support; Python is also supported but requires a Python interpreter configured in REAPER. While the languages differ in syntax, they share access to the same underlying API.

Scripts are saved with the extensions .eel, .lua, or .py and placed in REAPER's Scripts directory. They appear in the Actions list, can be assigned keyboard shortcuts or integrated into custom actions, and may be triggered by commands or events. Script API functions are accessed through the reaper namespace, such as reaper.GetTrack and reaper.SetMediaItemInfo_String.

ReaScript is included with REAPER and runs on Windows, macOS, and Linux. The distribution includes a built-in script editor, and users can pair external editors. The ecosystem is augmented by community-contributed scripts and documentation in the REAPER manual and online forums.