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//! Define backends using common libraries.
//!
//! Cursive doesn't print anything by itself: it delegates this job to a
//! backend library, which handles all actual input and output.
//!
//! This module defines the [`Backend`] trait, as well as a few implementations
//! using some common libraries. Each of those included backends needs a
//! corresonding feature to be enabled.
//!
//! [`Backend`]: ../backend/trait.Backend.html
#[cfg(unix)]
mod resize;
pub mod blt;
pub mod crossterm;
pub mod curses;
pub mod puppet;
pub mod termion;
#[allow(dead_code)]
fn boxed(e: impl std::error::Error + 'static) -> Box<dyn std::error::Error> {
Box::new(e)
}
/// Tries to initialize the default backend.
///
/// Will use the first backend enabled from the list:
/// * BearLibTerminal
/// * Termion
/// * Crossterm
/// * Pancurses
/// * Ncurses
/// * Dummy
pub fn try_default(
) -> Result<Box<dyn cursive_core::backend::Backend>, Box<dyn std::error::Error>>
{
cfg_if::cfg_if! {
if #[cfg(feature = "blt-backend")] {
Ok(blt::Backend::init())
} else if #[cfg(feature = "termion-backend")] {
termion::Backend::init().map_err(boxed)
} else if #[cfg(feature = "crossterm-backend")] {
crossterm::Backend::init().map_err(boxed)
} else if #[cfg(feature = "pancurses-backend")] {
curses::pan::Backend::init().map_err(boxed)
} else if #[cfg(feature = "ncurses-backend")] {
curses::n::Backend::init().map_err(boxed)
} else {
log::warn!("No built-it backend, falling back to Dummy backend.");
Ok(cursive_core::backend::Dummy::init())
}
}
}
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