src/libterm/lib.rs

   1 // Copyright 2013-2014 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 implementations,
  15 //! the `TerminfoTerminal`, which uses control characters from a
  16 //! [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 //!
  25 //! use std::io::prelude::*;
  26 //!
  27 //! fn main() {
  28 //!     let mut t = term::stdout().unwrap();
  29 //!
  30 //!     t.fg(term::color::GREEN).unwrap();
  31 //!     (write!(t, "hello, ")).unwrap();
  32 //!
  33 //!     t.fg(term::color::RED).unwrap();
  34 //!     (writeln!(t, "world!")).unwrap();
  35 //!
  36 //!     t.reset().unwrap();
  37 //! }
  38 //! ```
  39 //!
  40 //! [ansi]: https://en.wikipedia.org/wiki/ANSI_escape_code
  41 //! [win]: http://msdn.microsoft.com/en-us/library/windows/desktop/ms682010%28v=vs.85%29.aspx
  42 //! [ti]: https://en.wikipedia.org/wiki/Terminfo
  43
  44 // Do not remove on snapshot creation. Needed for bootstrap. (Issue #22364)
  45 #![cfg_attr(stage0, feature(custom_attribute))]
  46 #![crate_name = "term"]
  47 #![unstable(feature = "rustc_private",
  48             reason = "use the crates.io `term` library instead")]
  49 #![staged_api]
  50 #![crate_type = "rlib"]
  51 #![crate_type = "dylib"]
  52 #![doc(html_logo_url = "http://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
  53        html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
  54        html_root_url = "http://doc.rust-lang.org/nightly/",
  55        html_playground_url = "http://play.rust-lang.org/")]
  56 #![deny(missing_docs)]
  57
  58 #![feature(box_syntax)]
  59 #![feature(owned_ascii_ext)]
  60 #![feature(path_ext)]
  61 #![feature(rustc_private)]
  62 #![feature(staged_api)]
  63 #![feature(str_char)]
  64 #![feature(vec_push_all)]
  65 #![cfg_attr(windows, feature(libc))]
  66
  67 #[macro_use] extern crate log;
  68
  69 pub use terminfo::TerminfoTerminal;
  70 #[cfg(windows)]
  71 pub use win::WinConsole;
  72
  73 use std::io::prelude::*;
  74 use std::io;
  75
  76 pub mod terminfo;
  77
  78 #[cfg(windows)]
  79 mod win;
  80
  81 /// A hack to work around the fact that `Box<Write + Send>` does not
  82 /// currently implement `Write`.
  83 pub struct WriterWrapper {
  84     wrapped: Box<Write + Send>,
  85 }
  86
  87 impl Write for WriterWrapper {
  88     #[inline]
  89     fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
  90         self.wrapped.write(buf)
  91     }
  92
  93     #[inline]
  94     fn flush(&mut self) -> io::Result<()> {
  95         self.wrapped.flush()
  96     }
  97 }
  98
  99 #[cfg(not(windows))]
 100 /// Return a Terminal wrapping stdout, or None if a terminal couldn't be
 101 /// opened.
 102 pub fn stdout() -> Option<Box<Terminal<WriterWrapper> + Send>> {
 103     TerminfoTerminal::new(WriterWrapper {
 104         wrapped: box std::io::stdout(),
 105     })
 106 }
 107
 108 #[cfg(windows)]
 109 /// Return a Terminal wrapping stdout, or None if a terminal couldn't be
 110 /// opened.
 111 pub fn stdout() -> Option<Box<Terminal<WriterWrapper> + Send>> {
 112     let ti = TerminfoTerminal::new(WriterWrapper {
 113         wrapped: box std::io::stdout(),
 114     });
 115
 116     match ti {
 117         Some(t) => Some(t),
 118         None => {
 119             WinConsole::new(WriterWrapper {
 120                 wrapped: box std::io::stdout(),
 121             })
 122         }
 123     }
 124 }
 125
 126 #[cfg(not(windows))]
 127 /// Return a Terminal wrapping stderr, or None if a terminal couldn't be
 128 /// opened.
 129 pub fn stderr() -> Option<Box<Terminal<WriterWrapper> + Send>> {
 130     TerminfoTerminal::new(WriterWrapper {
 131         wrapped: box std::io::stderr(),
 132     })
 133 }
 134
 135 #[cfg(windows)]
 136 /// Return a Terminal wrapping stderr, or None if a terminal couldn't be
 137 /// opened.
 138 pub fn stderr() -> Option<Box<Terminal<WriterWrapper> + Send>> {
 139     let ti = TerminfoTerminal::new(WriterWrapper {
 140         wrapped: box std::io::stderr(),
 141     });
 142
 143     match ti {
 144         Some(t) => Some(t),
 145         None => {
 146             WinConsole::new(WriterWrapper {
 147                 wrapped: box std::io::stderr(),
 148             })
 149         }
 150     }
 151 }
 152
 153
 154 /// Terminal color definitions
 155 pub mod color {
 156     /// Number for a terminal color
 157     pub type Color = u16;
 158
 159     pub const BLACK:   Color = 0;
 160     pub const RED:     Color = 1;
 161     pub const GREEN:   Color = 2;
 162     pub const YELLOW:  Color = 3;
 163     pub const BLUE:    Color = 4;
 164     pub const MAGENTA: Color = 5;
 165     pub const CYAN:    Color = 6;
 166     pub const WHITE:   Color = 7;
 167
 168     pub const BRIGHT_BLACK:   Color = 8;
 169     pub const BRIGHT_RED:     Color = 9;
 170     pub const BRIGHT_GREEN:   Color = 10;
 171     pub const BRIGHT_YELLOW:  Color = 11;
 172     pub const BRIGHT_BLUE:    Color = 12;
 173     pub const BRIGHT_MAGENTA: Color = 13;
 174     pub const BRIGHT_CYAN:    Color = 14;
 175     pub const BRIGHT_WHITE:   Color = 15;
 176 }
 177
 178 /// Terminal attributes
 179 pub mod attr {
 180     pub use self::Attr::*;
 181
 182     /// Terminal attributes for use with term.attr().
 183     ///
 184     /// Most attributes can only be turned on and must be turned off with term.reset().
 185     /// The ones that can be turned off explicitly take a boolean value.
 186     /// Color is also represented as an attribute for convenience.
 187     #[derive(Copy, Clone)]
 188     pub enum Attr {
 189         /// Bold (or possibly bright) mode
 190         Bold,
 191         /// Dim mode, also called faint or half-bright. Often not supported
 192         Dim,
 193         /// Italics mode. Often not supported
 194         Italic(bool),
 195         /// Underline mode
 196         Underline(bool),
 197         /// Blink mode
 198         Blink,
 199         /// Standout mode. Often implemented as Reverse, sometimes coupled with Bold
 200         Standout(bool),
 201         /// Reverse mode, inverts the foreground and background colors
 202         Reverse,
 203         /// Secure mode, also called invis mode. Hides the printed text
 204         Secure,
 205         /// Convenience attribute to set the foreground color
 206         ForegroundColor(super::color::Color),
 207         /// Convenience attribute to set the background color
 208         BackgroundColor(super::color::Color)
 209     }
 210 }
 211
 212 /// A terminal with similar capabilities to an ANSI Terminal
 213 /// (foreground/background colors etc).
 214 pub trait Terminal<T: Write>: Write {
 215     /// Sets the foreground color to the given color.
 216     ///
 217     /// If the color is a bright color, but the terminal only supports 8 colors,
 218     /// the corresponding normal color will be used instead.
 219     ///
 220     /// Returns `Ok(true)` if the color was set, `Ok(false)` otherwise, and `Err(e)`
 221     /// if there was an I/O error.
 222     fn fg(&mut self, color: color::Color) -> io::Result<bool>;
 223
 224     /// Sets the background color to the given color.
 225     ///
 226     /// If the color is a bright color, but the terminal only supports 8 colors,
 227     /// the corresponding normal color will be used instead.
 228     ///
 229     /// Returns `Ok(true)` if the color was set, `Ok(false)` otherwise, and `Err(e)`
 230     /// if there was an I/O error.
 231     fn bg(&mut self, color: color::Color) -> io::Result<bool>;
 232
 233     /// Sets the given terminal attribute, if supported.  Returns `Ok(true)`
 234     /// if the attribute was supported, `Ok(false)` otherwise, and `Err(e)` if
 235     /// there was an I/O error.
 236     fn attr(&mut self, attr: attr::Attr) -> io::Result<bool>;
 237
 238     /// Returns whether the given terminal attribute is supported.
 239     fn supports_attr(&self, attr: attr::Attr) -> bool;
 240
 241     /// Resets all terminal attributes and color to the default.
 242     /// Returns `Ok()`.
 243     fn reset(&mut self) -> io::Result<()>;
 244
 245     /// Gets an immutable reference to the stream inside
 246     fn get_ref<'a>(&'a self) -> &'a T;
 247
 248     /// Gets a mutable reference to the stream inside
 249     fn get_mut<'a>(&'a mut self) -> &'a mut T;
 250 }
 251
 252 /// A terminal which can be unwrapped.
 253 pub trait UnwrappableTerminal<T: Write>: Terminal<T> {
 254     /// Returns the contained stream, destroying the `Terminal`
 255     fn unwrap(self) -> T;
 256 }