src/libterm/lib.rs

   1 // Copyright 2013-2015 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 //! Terminal formatting library.
  12 //!
  13 //! This crate provides the `Terminal` trait, which abstracts over an [ANSI
  14 //! Terminal][ansi] to provide color printing, among other things. There are two
  15 //! implementations, the `TerminfoTerminal`, which uses control characters from
  16 //! a [terminfo][ti] database, and `WinConsole`, which uses the [Win32 Console
  17 //! API][win].
  18 //!
  19 //! # Examples
  20 //!
  21 //! ```no_run
  22 //! # #![feature(rustc_private)]
  23 //! extern crate term;
  24 //! use std::io::prelude::*;
  25 //!
  26 //! fn main() {
  27 //!     let mut t = term::stdout().unwrap();
  28 //!
  29 //!     t.fg(term::color::GREEN).unwrap();
  30 //!     write!(t, "hello, ").unwrap();
  31 //!
  32 //!     t.fg(term::color::RED).unwrap();
  33 //!     writeln!(t, "world!").unwrap();
  34 //!
  35 //!     assert!(t.reset().unwrap());
  36 //! }
  37 //! ```
  38 //!
  39 //! [ansi]: https://en.wikipedia.org/wiki/ANSI_escape_code
  40 //! [win]: http://msdn.microsoft.com/en-us/library/windows/desktop/ms682010%28v=vs.85%29.aspx
  41 //! [ti]: https://en.wikipedia.org/wiki/Terminfo
  42
  43 #![crate_name = "term"]
  44 #![unstable(feature = "rustc_private",
  45             reason = "use the crates.io `term` library instead",
  46             issue = "27812")]
  47 #![crate_type = "rlib"]
  48 #![crate_type = "dylib"]
  49 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
  50        html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
  51        html_root_url = "https://doc.rust-lang.org/nightly/",
  52        html_playground_url = "https://play.rust-lang.org/",
  53        test(attr(deny(warnings))))]
  54 #![deny(missing_docs)]
  55 #![deny(warnings)]
  56
  57 #![feature(box_syntax)]
  58 #![feature(staged_api)]
  59 #![cfg_attr(windows, feature(libc))]
  60 // Handle rustfmt skips
  61 #![feature(custom_attribute)]
  62 #![allow(unused_attributes)]
  63
  64 use std::io::prelude::*;
  65
  66 pub use terminfo::TerminfoTerminal;
  67 #[cfg(windows)]
  68 pub use win::WinConsole;
  69
  70 use std::io::{self, Stdout, Stderr};
  71
  72 pub mod terminfo;
  73
  74 #[cfg(windows)]
  75 mod win;
  76
  77 /// Alias for stdout terminals.
  78 pub type StdoutTerminal = Terminal<Output = Stdout> + Send;
  79 /// Alias for stderr terminals.
  80 pub type StderrTerminal = Terminal<Output = Stderr> + Send;
  81
  82 #[cfg(not(windows))]
  83 /// Return a Terminal wrapping stdout, or None if a terminal couldn't be
  84 /// opened.
  85 pub fn stdout() -> Option<Box<StdoutTerminal>> {
  86     TerminfoTerminal::new(io::stdout()).map(|t| Box::new(t) as Box<StdoutTerminal>)
  87 }
  88
  89 #[cfg(windows)]
  90 /// Return a Terminal wrapping stdout, or None if a terminal couldn't be
  91 /// opened.
  92 pub fn stdout() -> Option<Box<StdoutTerminal>> {
  93     TerminfoTerminal::new(io::stdout())
  94         .map(|t| Box::new(t) as Box<StdoutTerminal>)
  95         .or_else(|| WinConsole::new(io::stdout()).ok().map(|t| Box::new(t) as Box<StdoutTerminal>))
  96 }
  97
  98 #[cfg(not(windows))]
  99 /// Return a Terminal wrapping stderr, or None if a terminal couldn't be
 100 /// opened.
 101 pub fn stderr() -> Option<Box<StderrTerminal>> {
 102     TerminfoTerminal::new(io::stderr()).map(|t| Box::new(t) as Box<StderrTerminal>)
 103 }
 104
 105 #[cfg(windows)]
 106 /// Return a Terminal wrapping stderr, or None if a terminal couldn't be
 107 /// opened.
 108 pub fn stderr() -> Option<Box<StderrTerminal>> {
 109     TerminfoTerminal::new(io::stderr())
 110         .map(|t| Box::new(t) as Box<StderrTerminal>)
 111         .or_else(|| WinConsole::new(io::stderr()).ok().map(|t| Box::new(t) as Box<StderrTerminal>))
 112 }
 113
 114
 115 /// Terminal color definitions
 116 #[allow(missing_docs)]
 117 pub mod color {
 118     /// Number for a terminal color
 119     pub type Color = u16;
 120
 121     pub const BLACK: Color = 0;
 122     pub const RED: Color = 1;
 123     pub const GREEN: Color = 2;
 124     pub const YELLOW: Color = 3;
 125     pub const BLUE: Color = 4;
 126     pub const MAGENTA: Color = 5;
 127     pub const CYAN: Color = 6;
 128     pub const WHITE: Color = 7;
 129
 130     pub const BRIGHT_BLACK: Color = 8;
 131     pub const BRIGHT_RED: Color = 9;
 132     pub const BRIGHT_GREEN: Color = 10;
 133     pub const BRIGHT_YELLOW: Color = 11;
 134     pub const BRIGHT_BLUE: Color = 12;
 135     pub const BRIGHT_MAGENTA: Color = 13;
 136     pub const BRIGHT_CYAN: Color = 14;
 137     pub const BRIGHT_WHITE: Color = 15;
 138 }
 139
 140 /// Terminal attributes for use with term.attr().
 141 ///
 142 /// Most attributes can only be turned on and must be turned off with term.reset().
 143 /// The ones that can be turned off explicitly take a boolean value.
 144 /// Color is also represented as an attribute for convenience.
 145 #[derive(Debug, PartialEq, Eq, Copy, Clone)]
 146 pub enum Attr {
 147     /// Bold (or possibly bright) mode
 148     Bold,
 149     /// Dim mode, also called faint or half-bright. Often not supported
 150     Dim,
 151     /// Italics mode. Often not supported
 152     Italic(bool),
 153     /// Underline mode
 154     Underline(bool),
 155     /// Blink mode
 156     Blink,
 157     /// Standout mode. Often implemented as Reverse, sometimes coupled with Bold
 158     Standout(bool),
 159     /// Reverse mode, inverts the foreground and background colors
 160     Reverse,
 161     /// Secure mode, also called invis mode. Hides the printed text
 162     Secure,
 163     /// Convenience attribute to set the foreground color
 164     ForegroundColor(color::Color),
 165     /// Convenience attribute to set the background color
 166     BackgroundColor(color::Color),
 167 }
 168
 169 /// A terminal with similar capabilities to an ANSI Terminal
 170 /// (foreground/background colors etc).
 171 pub trait Terminal: Write {
 172     /// The terminal's output writer type.
 173     type Output: Write;
 174
 175     /// Sets the foreground color to the given color.
 176     ///
 177     /// If the color is a bright color, but the terminal only supports 8 colors,
 178     /// the corresponding normal color will be used instead.
 179     ///
 180     /// Returns `Ok(true)` if the color was set, `Ok(false)` otherwise, and `Err(e)`
 181     /// if there was an I/O error.
 182     fn fg(&mut self, color: color::Color) -> io::Result<bool>;
 183
 184     /// Sets the background color to the given color.
 185     ///
 186     /// If the color is a bright color, but the terminal only supports 8 colors,
 187     /// the corresponding normal color will be used instead.
 188     ///
 189     /// Returns `Ok(true)` if the color was set, `Ok(false)` otherwise, and `Err(e)`
 190     /// if there was an I/O error.
 191     fn bg(&mut self, color: color::Color) -> io::Result<bool>;
 192
 193     /// Sets the given terminal attribute, if supported.  Returns `Ok(true)`
 194     /// if the attribute was supported, `Ok(false)` otherwise, and `Err(e)` if
 195     /// there was an I/O error.
 196     fn attr(&mut self, attr: Attr) -> io::Result<bool>;
 197
 198     /// Returns whether the given terminal attribute is supported.
 199     fn supports_attr(&self, attr: Attr) -> bool;
 200
 201     /// Resets all terminal attributes and colors to their defaults.
 202     ///
 203     /// Returns `Ok(true)` if the terminal was reset, `Ok(false)` otherwise, and `Err(e)` if there
 204     /// was an I/O error.
 205     ///
 206     /// *Note: This does not flush.*
 207     ///
 208     /// That means the reset command may get buffered so, if you aren't planning on doing anything
 209     /// else that might flush stdout's buffer (e.g. writing a line of text), you should flush after
 210     /// calling reset.
 211     fn reset(&mut self) -> io::Result<bool>;
 212
 213     /// Gets an immutable reference to the stream inside
 214     fn get_ref(&self) -> &Self::Output;
 215
 216     /// Gets a mutable reference to the stream inside
 217     fn get_mut(&mut self) -> &mut Self::Output;
 218
 219     /// Returns the contained stream, destroying the `Terminal`
 220     fn into_inner(self) -> Self::Output where Self: Sized;
 221 }