1 //! Terminfo database interface.
3 use std::collections::HashMap;
8 use std::io::{self, prelude::*, BufReader};
15 use parm::{expand, Param, Variables};
16 use parser::compiled::{msys_terminfo, parse};
17 use searcher::get_dbpath_for_term;
19 /// A parsed terminfo database entry.
22 /// Names for the terminal
23 pub names: Vec<String>,
24 /// Map of capability name to boolean value
25 pub bools: HashMap<String, bool>,
26 /// Map of capability name to numeric value
27 pub numbers: HashMap<String, u32>,
28 /// Map of capability name to raw (unexpanded) string
29 pub strings: HashMap<String, Vec<u8>>,
32 /// A terminfo creation error.
35 /// TermUnset Indicates that the environment doesn't include enough information to find
36 /// the terminfo entry.
38 /// MalformedTerminfo indicates that parsing the terminfo entry failed.
39 MalformedTerminfo(String),
40 /// io::Error forwards any io::Errors encountered when finding or reading the terminfo entry.
44 impl error::Error for Error {
45 fn source(&self) -> Option<&(dyn error::Error + 'static)> {
48 IoError(e) => Some(e),
54 impl fmt::Display for Error {
55 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
59 MalformedTerminfo(ref e) => e.fmt(f),
60 IoError(ref e) => e.fmt(f),
66 /// Creates a TermInfo based on current environment.
67 pub fn from_env() -> Result<TermInfo, Error> {
68 let term = match env::var("TERM") {
69 Ok(name) => TermInfo::from_name(&name),
70 Err(..) => return Err(Error::TermUnset),
73 if term.is_err() && env::var("MSYSCON").map_or(false, |s| "mintty.exe" == s) {
81 /// Creates a TermInfo for the named terminal.
82 pub fn from_name(name: &str) -> Result<TermInfo, Error> {
83 get_dbpath_for_term(name)
85 Error::IoError(io::Error::new(io::ErrorKind::NotFound, "terminfo file not found"))
87 .and_then(|p| TermInfo::from_path(&(*p)))
90 /// Parse the given TermInfo.
91 pub fn from_path<P: AsRef<Path>>(path: P) -> Result<TermInfo, Error> {
92 Self::_from_path(path.as_ref())
94 // Keep the metadata small
95 fn _from_path(path: &Path) -> Result<TermInfo, Error> {
96 let file = File::open(path).map_err(Error::IoError)?;
97 let mut reader = BufReader::new(file);
98 parse(&mut reader, false).map_err(Error::MalformedTerminfo)
104 /// TermInfo format parsing.
106 //! ncurses-compatible compiled terminfo format parsing (term(5))
111 fn cap_for_attr(attr: Attr) -> &'static str {
113 Attr::Bold => "bold",
115 Attr::Italic(true) => "sitm",
116 Attr::Italic(false) => "ritm",
117 Attr::Underline(true) => "smul",
118 Attr::Underline(false) => "rmul",
119 Attr::Blink => "blink",
120 Attr::Standout(true) => "smso",
121 Attr::Standout(false) => "rmso",
122 Attr::Reverse => "rev",
123 Attr::Secure => "invis",
124 Attr::ForegroundColor(_) => "setaf",
125 Attr::BackgroundColor(_) => "setab",
129 /// A Terminal that knows how many colors it supports, with a reference to its
130 /// parsed Terminfo database record.
131 pub struct TerminfoTerminal<T> {
137 impl<T: Write + Send> Terminal for TerminfoTerminal<T> {
139 fn fg(&mut self, color: color::Color) -> io::Result<bool> {
140 let color = self.dim_if_necessary(color);
141 if self.num_colors > color {
142 return self.apply_cap("setaf", &[Param::Number(color as i32)]);
147 fn bg(&mut self, color: color::Color) -> io::Result<bool> {
148 let color = self.dim_if_necessary(color);
149 if self.num_colors > color {
150 return self.apply_cap("setab", &[Param::Number(color as i32)]);
155 fn attr(&mut self, attr: Attr) -> io::Result<bool> {
157 Attr::ForegroundColor(c) => self.fg(c),
158 Attr::BackgroundColor(c) => self.bg(c),
159 _ => self.apply_cap(cap_for_attr(attr), &[]),
163 fn supports_attr(&self, attr: Attr) -> bool {
165 Attr::ForegroundColor(_) | Attr::BackgroundColor(_) => self.num_colors > 0,
167 let cap = cap_for_attr(attr);
168 self.ti.strings.get(cap).is_some()
173 fn reset(&mut self) -> io::Result<bool> {
174 // are there any terminals that have color/attrs and not sgr0?
175 // Try falling back to sgr, then op
176 let cmd = match ["sgr0", "sgr", "op"].iter().find_map(|cap| self.ti.strings.get(*cap)) {
177 Some(op) => match expand(&op, &[], &mut Variables::new()) {
179 Err(e) => return Err(io::Error::new(io::ErrorKind::InvalidData, e)),
181 None => return Ok(false),
183 self.out.write_all(&cmd).and(Ok(true))
186 fn get_ref(&self) -> &T {
190 fn get_mut(&mut self) -> &mut T {
194 fn into_inner(self) -> T
202 impl<T: Write + Send> TerminfoTerminal<T> {
203 /// Creates a new TerminfoTerminal with the given TermInfo and Write.
204 pub fn new_with_terminfo(out: T, terminfo: TermInfo) -> TerminfoTerminal<T> {
205 let nc = if terminfo.strings.contains_key("setaf") && terminfo.strings.contains_key("setab")
207 terminfo.numbers.get("colors").map_or(0, |&n| n)
212 TerminfoTerminal { out, ti: terminfo, num_colors: nc }
215 /// Creates a new TerminfoTerminal for the current environment with the given Write.
217 /// Returns `None` when the terminfo cannot be found or parsed.
218 pub fn new(out: T) -> Option<TerminfoTerminal<T>> {
219 TermInfo::from_env().map(move |ti| TerminfoTerminal::new_with_terminfo(out, ti)).ok()
222 fn dim_if_necessary(&self, color: color::Color) -> color::Color {
223 if color >= self.num_colors && color >= 8 && color < 16 { color - 8 } else { color }
226 fn apply_cap(&mut self, cmd: &str, params: &[Param]) -> io::Result<bool> {
227 match self.ti.strings.get(cmd) {
228 Some(cmd) => match expand(&cmd, params, &mut Variables::new()) {
229 Ok(s) => self.out.write_all(&s).and(Ok(true)),
230 Err(e) => Err(io::Error::new(io::ErrorKind::InvalidData, e)),
237 impl<T: Write> Write for TerminfoTerminal<T> {
238 fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
242 fn flush(&mut self) -> io::Result<()> {