For a Rust TUI, let Ratatui manage drawing, use your backend’s event API for input, restore raw mode and other terminal modes on every exit path, and treat text from users, logs, or subprocesses as untrusted. With Ratatui 0.30 or later, ratatui::run is the simplest managed lifecycle for most fullscreen apps; sanitize untrusted text before it reaches the terminal.
How should input and drawing flow through a Ratatui app?
Ratatui is a rendering library, not an input system. With Crossterm, read keyboard, mouse, and other terminal events through crossterm::event. Handle each event and update application state between draw calls, then render the current state through Ratatui.
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Ratatui widgets write into an intermediate buffer. On Terminal::draw, Ratatui compares that buffer with its previous view and flushes the required changes to the terminal. Keep normal screen output within this rendering path so the renderer’s view stays aligned with what is displayed.
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A fullscreen application commonly enables raw mode and switches to the alternate screen. These modes change the terminal for the application’s use, so setup must have corresponding cleanup. The right lifecycle approach depends on how much control you need:
#1 Best Overall
| Approach | When to use it | Cleanup responsibility |
|---|---|---|
ratatui::run |
Most fullscreen applications on Ratatui 0.30 or later. | The helper provides a preconfigured terminal and restores state when the callback returns or panics. |
ratatui::init and ratatui::restore |
When you need to control the event loop and choose when to restore. | Call restore at the appropriate point in your application’s lifecycle. |
| Manual terminal construction | When you need to manage setup and terminal behavior yourself. | Your application owns mode setup and teardown, including handling panic paths. |
Ratatui documents run as introduced in version 0.30. Older tutorials may use init/restore or manual setup; match the approach to the version you actually have installed. The current lifecycle guidance is in the Ratatui terminal documentation.
Which backend should handle terminal events and modes?
Ratatui documents Crossterm, Termion, Termwiz, and Termina as backends. Choose according to platform support, event APIs, and the raw-mode, alternate-screen, and mouse-capture controls your application needs. The documentation does not establish one universally best backend; Crossterm is commonly used with Ratatui.
Rank #2
If you use Crossterm directly, keep its crate version compatible with Ratatui’s. The Ratatui backend guide warns that incompatible major versions can maintain separate event queues and raw-mode state, potentially causing lost or racing events or incorrect restoration.
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Why doesn’t ANSI styling inside a string work as Ratatui styling?
Ratatui stores cell text separately from style metadata. An ANSI escape sequence embedded in a text string is therefore not interpreted as a Ratatui style instruction. For styled output, express styling with Ratatui’s text and style types, or deliberately parse and convert ANSI-formatted input with an appropriate converter.
Rank #3
Avoid writing directly to the terminal or moving its cursor behind Ratatui’s back while relying on the renderer’s existing buffers. Ratatui tracks its own buffers and cursor positions, not arbitrary changes made by other code. If an integration must write directly or change the screen surface, clear the terminal or perform a full draw before relying on normal differential rendering again.
How do I prevent ANSI escape injection in terminal output?
Escape sequences are terminal commands, not harmless decoration. Untrusted text can manipulate terminal state or make output appear to say something it does not. Establish a boundary between renderer-generated styling, which your application controls, and untrusted content from user input, remote services, child processes, or logs.
- Sanitize untrusted text when it becomes terminal-visible, including in log output.
- Choose which ordinary control characters to allow for each field. A single-line label may need to reject tabs and line breaks, while a multiline log view may preserve them.
- Do not rely on removing only a visible
ESC [pattern. OSC and other control-string families, including 8-bit controls, can also be relevant. - Review the sanitizer against the terminal protocols and characters your application accepts; a narrow pattern replacement is not a general-purpose guarantee.
A proposed FrankenTUI design recommends stripping ESC and CSI/OSC/DCS/APC sequences by default, preserving TAB/LF/CR, and requiring explicit opt-in for raw passthrough. That is a project proposal, not a universal standard. It is a useful starting point for a policy: default to sanitized display, and make any raw-output path explicit and limited to data you deliberately trust.
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RustSec Advisory Database entry RUSTSEC-2025-0055, issued September 2, 2025, states: “Previous versions of tracing-subscriber were vulnerable to ANSI escape sequence injection attacks.” The advisory describes untrusted input affecting terminal titles or displays and misleading users; it lists tracing-subscriber versions >=0.3.20 as patched. This finding concerns prior versions and a particular logging path, not every version or logging configuration. Check the RustSec advisory for current status and assess the version and configuration in your own dependency tree.
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