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Diffstat (limited to 'library/test/src/term.rs')
-rw-r--r-- | library/test/src/term.rs | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/library/test/src/term.rs b/library/test/src/term.rs new file mode 100644 index 000000000..b256ab7b8 --- /dev/null +++ b/library/test/src/term.rs @@ -0,0 +1,85 @@ +//! Terminal formatting module. +//! +//! This module provides the `Terminal` trait, which abstracts over an [ANSI +//! Terminal][ansi] to provide color printing, among other things. There are two +//! implementations, the `TerminfoTerminal`, which uses control characters from +//! a [terminfo][ti] database, and `WinConsole`, which uses the [Win32 Console +//! API][win]. +//! +//! [ansi]: https://en.wikipedia.org/wiki/ANSI_escape_code +//! [win]: https://docs.microsoft.com/en-us/windows/console/character-mode-applications +//! [ti]: https://en.wikipedia.org/wiki/Terminfo + +#![deny(missing_docs)] + +use std::io::{self, prelude::*}; + +pub(crate) use terminfo::TerminfoTerminal; +#[cfg(windows)] +pub(crate) use win::WinConsole; + +pub(crate) mod terminfo; + +#[cfg(windows)] +mod win; + +/// Alias for stdout terminals. +pub(crate) type StdoutTerminal = dyn Terminal + Send; + +#[cfg(not(windows))] +/// Returns a Terminal wrapping stdout, or None if a terminal couldn't be +/// opened. +pub(crate) fn stdout() -> Option<Box<StdoutTerminal>> { + TerminfoTerminal::new(io::stdout()).map(|t| Box::new(t) as Box<StdoutTerminal>) +} + +#[cfg(windows)] +/// Returns a Terminal wrapping stdout, or None if a terminal couldn't be +/// opened. +pub(crate) fn stdout() -> Option<Box<StdoutTerminal>> { + TerminfoTerminal::new(io::stdout()) + .map(|t| Box::new(t) as Box<StdoutTerminal>) + .or_else(|| WinConsole::new(io::stdout()).ok().map(|t| Box::new(t) as Box<StdoutTerminal>)) +} + +/// Terminal color definitions +#[allow(missing_docs)] +#[cfg_attr(not(windows), allow(dead_code))] +pub(crate) mod color { + /// Number for a terminal color + pub(crate) type Color = u32; + + pub(crate) const BLACK: Color = 0; + pub(crate) const RED: Color = 1; + pub(crate) const GREEN: Color = 2; + pub(crate) const YELLOW: Color = 3; + pub(crate) const BLUE: Color = 4; + pub(crate) const MAGENTA: Color = 5; + pub(crate) const CYAN: Color = 6; + pub(crate) const WHITE: Color = 7; +} + +/// A terminal with similar capabilities to an ANSI Terminal +/// (foreground/background colors etc). +pub trait Terminal: Write { + /// Sets the foreground color to the given color. + /// + /// If the color is a bright color, but the terminal only supports 8 colors, + /// the corresponding normal color will be used instead. + /// + /// Returns `Ok(true)` if the color was set, `Ok(false)` otherwise, and `Err(e)` + /// if there was an I/O error. + fn fg(&mut self, color: color::Color) -> io::Result<bool>; + + /// Resets all terminal attributes and colors to their defaults. + /// + /// Returns `Ok(true)` if the terminal was reset, `Ok(false)` otherwise, and `Err(e)` if there + /// was an I/O error. + /// + /// *Note: This does not flush.* + /// + /// That means the reset command may get buffered so, if you aren't planning on doing anything + /// else that might flush stdout's buffer (e.g., writing a line of text), you should flush after + /// calling reset. + fn reset(&mut self) -> io::Result<bool>; +} |