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.
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.
11 //! Simple ANSI color library
13 #![crate_id = "term#0.10-pre"]
14 #![comment = "Simple ANSI color library"]
15 #![license = "MIT/ASL2"]
16 #![crate_type = "rlib"]
17 #![crate_type = "dylib"]
18 #![doc(html_logo_url = "http://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
19 html_favicon_url = "http://www.rust-lang.org/favicon.ico",
20 html_root_url = "http://static.rust-lang.org/doc/master")]
22 #![feature(macro_rules)]
25 extern crate collections;
29 use terminfo::TermInfo;
30 use terminfo::searcher::open;
31 use terminfo::parser::compiled::{parse, msys_terminfo};
32 use terminfo::parm::{expand, Number, Variables};
36 // FIXME (#2807): Windows support.
38 /// Terminal color definitions
40 /// Number for a terminal color
43 pub static BLACK: Color = 0u16;
44 pub static RED: Color = 1u16;
45 pub static GREEN: Color = 2u16;
46 pub static YELLOW: Color = 3u16;
47 pub static BLUE: Color = 4u16;
48 pub static MAGENTA: Color = 5u16;
49 pub static CYAN: Color = 6u16;
50 pub static WHITE: Color = 7u16;
52 pub static BRIGHT_BLACK: Color = 8u16;
53 pub static BRIGHT_RED: Color = 9u16;
54 pub static BRIGHT_GREEN: Color = 10u16;
55 pub static BRIGHT_YELLOW: Color = 11u16;
56 pub static BRIGHT_BLUE: Color = 12u16;
57 pub static BRIGHT_MAGENTA: Color = 13u16;
58 pub static BRIGHT_CYAN: Color = 14u16;
59 pub static BRIGHT_WHITE: Color = 15u16;
62 /// Terminal attributes
64 /// Terminal attributes for use with term.attr().
66 /// Most attributes can only be turned on and must be turned off with term.reset().
67 /// The ones that can be turned off explicitly take a boolean value.
68 /// Color is also represented as an attribute for convenience.
70 /// Bold (or possibly bright) mode
72 /// Dim mode, also called faint or half-bright. Often not supported
74 /// Italics mode. Often not supported
80 /// Standout mode. Often implemented as Reverse, sometimes coupled with Bold
82 /// Reverse mode, inverts the foreground and background colors
84 /// Secure mode, also called invis mode. Hides the printed text
86 /// Convenience attribute to set the foreground color
87 ForegroundColor(super::color::Color),
88 /// Convenience attribute to set the background color
89 BackgroundColor(super::color::Color)
93 fn cap_for_attr(attr: attr::Attr) -> &'static str {
97 attr::Italic(true) => "sitm",
98 attr::Italic(false) => "ritm",
99 attr::Underline(true) => "smul",
100 attr::Underline(false) => "rmul",
101 attr::Blink => "blink",
102 attr::Standout(true) => "smso",
103 attr::Standout(false) => "rmso",
104 attr::Reverse => "rev",
105 attr::Secure => "invis",
106 attr::ForegroundColor(_) => "setaf",
107 attr::BackgroundColor(_) => "setab"
111 /// A Terminal that knows how many colors it supports, with a reference to its
112 /// parsed TermInfo database record.
113 pub struct Terminal<T> {
114 priv num_colors: u16,
119 impl<T: Writer> Terminal<T> {
120 /// Returns a wrapped output stream (`Terminal<T>`) as a `Result`.
122 /// Returns `Err()` if the TERM environment variable is undefined.
123 /// TERM should be set to something like `xterm-color` or `screen-256color`.
125 /// Returns `Err()` on failure to open the terminfo database correctly.
126 /// Also, in the event that the individual terminfo database entry can not
128 pub fn new(out: T) -> Result<Terminal<T>, ~str> {
129 let term = match os::getenv("TERM") {
131 None => return Err(~"TERM environment variable undefined")
134 let entry = open(term);
136 if "cygwin" == term { // msys terminal
137 return Ok(Terminal {out: out, ti: msys_terminfo(), num_colors: 8});
139 return Err(entry.unwrap_err());
142 let mut file = entry.unwrap();
143 let ti = parse(&mut file, false);
145 return Err(ti.unwrap_err());
148 let inf = ti.unwrap();
149 let nc = if inf.strings.find_equiv(&("setaf")).is_some()
150 && inf.strings.find_equiv(&("setab")).is_some() {
151 inf.numbers.find_equiv(&("colors")).map_or(0, |&n| n)
154 return Ok(Terminal {out: out, ti: inf, num_colors: nc});
156 /// Sets the foreground color to the given color.
158 /// If the color is a bright color, but the terminal only supports 8 colors,
159 /// the corresponding normal color will be used instead.
161 /// Returns `Ok(true)` if the color was set, `Ok(false)` otherwise, and `Err(e)`
162 /// if there was an I/O error.
163 pub fn fg(&mut self, color: color::Color) -> io::IoResult<bool> {
164 let color = self.dim_if_necessary(color);
165 if self.num_colors > color {
166 let s = expand(self.ti
168 .find_equiv(&("setaf"))
171 [Number(color as int)], &mut Variables::new());
173 try!(self.out.write(s.unwrap().as_slice()));
179 /// Sets the background color to the given color.
181 /// If the color is a bright color, but the terminal only supports 8 colors,
182 /// the corresponding normal color will be used instead.
184 /// Returns `Ok(true)` if the color was set, `Ok(false)` otherwise, and `Err(e)`
185 /// if there was an I/O error.
186 pub fn bg(&mut self, color: color::Color) -> io::IoResult<bool> {
187 let color = self.dim_if_necessary(color);
188 if self.num_colors > color {
189 let s = expand(self.ti
191 .find_equiv(&("setab"))
194 [Number(color as int)], &mut Variables::new());
196 try!(self.out.write(s.unwrap().as_slice()));
203 /// Sets the given terminal attribute, if supported.
204 /// Returns `Ok(true)` if the attribute was supported, `Ok(false)` otherwise,
205 /// and `Err(e)` if there was an I/O error.
206 pub fn attr(&mut self, attr: attr::Attr) -> io::IoResult<bool> {
208 attr::ForegroundColor(c) => self.fg(c),
209 attr::BackgroundColor(c) => self.bg(c),
211 let cap = cap_for_attr(attr);
212 let parm = self.ti.strings.find_equiv(&cap);
214 let s = expand(parm.unwrap().as_slice(),
216 &mut Variables::new());
218 try!(self.out.write(s.unwrap().as_slice()));
227 /// Returns whether the given terminal attribute is supported.
228 pub fn supports_attr(&self, attr: attr::Attr) -> bool {
230 attr::ForegroundColor(_) | attr::BackgroundColor(_) => {
234 let cap = cap_for_attr(attr);
235 self.ti.strings.find_equiv(&cap).is_some()
240 /// Resets all terminal attributes and color to the default.
242 pub fn reset(&mut self) -> io::IoResult<()> {
243 let mut cap = self.ti.strings.find_equiv(&("sgr0"));
245 // are there any terminals that have color/attrs and not sgr0?
246 // Try falling back to sgr, then op
247 cap = self.ti.strings.find_equiv(&("sgr"));
249 cap = self.ti.strings.find_equiv(&("op"));
252 let s = cap.map_or(Err(~"can't find terminfo capability `sgr0`"), |op| {
253 expand(op.as_slice(), [], &mut Variables::new())
256 return self.out.write(s.unwrap().as_slice())
261 fn dim_if_necessary(&self, color: color::Color) -> color::Color {
262 if color >= self.num_colors && color >= 8 && color < 16 {
267 /// Returns the contained stream
268 pub fn unwrap(self) -> T { self.out }
270 /// Gets an immutable reference to the stream inside
271 pub fn get_ref<'a>(&'a self) -> &'a T { &self.out }
273 /// Gets a mutable reference to the stream inside
274 pub fn get_mut<'a>(&'a mut self) -> &'a mut T { &mut self.out }
277 impl<T: Writer> Writer for Terminal<T> {
278 fn write(&mut self, buf: &[u8]) -> io::IoResult<()> {
282 fn flush(&mut self) -> io::IoResult<()> {