prompttoolkit

prompttoolkit is a Python library for building interactive command-line applications. It provides a powerful framework for creating rich user interfaces within the terminal, going beyond the capabilities of standard input prompts. The library offers features such as syntax highlighting, autocompletion, key bindings, and multi-line input editing.

Its core functionality revolves around the `PromptSession` object, which manages the input process. Users can define custom lexers for syntax highlighting, allowing for dynamic coloring of input text based on defined grammars. Autocompletion can be implemented using callable functions or predefined lists, suggesting relevant options as the user types. Advanced key bindings enable users to customize keyboard shortcuts for various actions within the prompt.

prompttoolkit is designed to be flexible and extensible. It supports asynchronous operations, making it suitable for applications that require non-blocking input. The library also provides tools for building more complex terminal UIs, including dialogs, menus, and progress bars, though its primary focus remains on enhancing the command-line prompt experience. It is widely used in various Python projects, including popular command-line tools and interactive shells.