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//! Terminfo database interface.
use std::collections::HashMap;
use std::env;
use std::error;
use std::fmt;
use std::fs::File;
use std::io::{self, prelude::*, BufReader};
use std::path::Path;
use super::color;
use super::Terminal;
use parm::{expand, Param, Variables};
use parser::compiled::{msys_terminfo, parse};
use searcher::get_dbpath_for_term;
/// A parsed terminfo database entry.
#[allow(unused)]
#[derive(Debug)]
pub(crate) struct TermInfo {
/// Names for the terminal
pub(crate) names: Vec<String>,
/// Map of capability name to boolean value
pub(crate) bools: HashMap<String, bool>,
/// Map of capability name to numeric value
pub(crate) numbers: HashMap<String, u32>,
/// Map of capability name to raw (unexpanded) string
pub(crate) strings: HashMap<String, Vec<u8>>,
}
/// A terminfo creation error.
#[derive(Debug)]
pub(crate) enum Error {
/// TermUnset Indicates that the environment doesn't include enough information to find
/// the terminfo entry.
TermUnset,
/// MalformedTerminfo indicates that parsing the terminfo entry failed.
MalformedTerminfo(String),
/// io::Error forwards any io::Errors encountered when finding or reading the terminfo entry.
IoError(io::Error),
}
impl error::Error for Error {
fn source(&self) -> Option<&(dyn error::Error + 'static)> {
use Error::*;
match self {
IoError(e) => Some(e),
_ => None,
}
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
use Error::*;
match *self {
TermUnset => Ok(()),
MalformedTerminfo(ref e) => e.fmt(f),
IoError(ref e) => e.fmt(f),
}
}
}
impl TermInfo {
/// Creates a TermInfo based on current environment.
pub(crate) fn from_env() -> Result<TermInfo, Error> {
let term = match env::var("TERM") {
Ok(name) => TermInfo::from_name(&name),
Err(..) => return Err(Error::TermUnset),
};
if term.is_err() && env::var("MSYSCON").map_or(false, |s| "mintty.exe" == s) {
// msys terminal
Ok(msys_terminfo())
} else {
term
}
}
/// Creates a TermInfo for the named terminal.
pub(crate) fn from_name(name: &str) -> Result<TermInfo, Error> {
if cfg!(miri) {
// Avoid all the work of parsing the terminfo (it's pretty slow under Miri), and just
// assume that the standard color codes work (like e.g. the 'colored' crate).
return Ok(TermInfo {
names: Default::default(),
bools: Default::default(),
numbers: Default::default(),
strings: Default::default(),
});
}
get_dbpath_for_term(name)
.ok_or_else(|| {
Error::IoError(io::Error::new(io::ErrorKind::NotFound, "terminfo file not found"))
})
.and_then(|p| TermInfo::from_path(&(*p)))
}
/// Parse the given TermInfo.
pub(crate) fn from_path<P: AsRef<Path>>(path: P) -> Result<TermInfo, Error> {
Self::_from_path(path.as_ref())
}
// Keep the metadata small
fn _from_path(path: &Path) -> Result<TermInfo, Error> {
let file = File::open(path).map_err(Error::IoError)?;
let mut reader = BufReader::new(file);
parse(&mut reader, false).map_err(Error::MalformedTerminfo)
}
}
pub(crate) mod searcher;
/// TermInfo format parsing.
pub(crate) mod parser {
//! ncurses-compatible compiled terminfo format parsing (term(5))
pub(crate) mod compiled;
}
pub(crate) mod parm;
/// A Terminal that knows how many colors it supports, with a reference to its
/// parsed Terminfo database record.
pub(crate) struct TerminfoTerminal<T> {
num_colors: u32,
out: T,
ti: TermInfo,
}
impl<T: Write + Send> Terminal for TerminfoTerminal<T> {
fn fg(&mut self, color: color::Color) -> io::Result<bool> {
let color = self.dim_if_necessary(color);
if cfg!(miri) && color < 8 {
// The Miri logic for this only works for the most basic 8 colors, which we just assume
// the terminal will support. (`num_colors` is always 0 in Miri, so higher colors will
// just fail. But libtest doesn't use any higher colors anyway.)
return write!(self.out, "\x1B[3{color}m").and(Ok(true));
}
if self.num_colors > color {
return self.apply_cap("setaf", &[Param::Number(color as i32)]);
}
Ok(false)
}
fn reset(&mut self) -> io::Result<bool> {
if cfg!(miri) {
return write!(self.out, "\x1B[0m").and(Ok(true));
}
// are there any terminals that have color/attrs and not sgr0?
// Try falling back to sgr, then op
let cmd = match ["sgr0", "sgr", "op"].iter().find_map(|cap| self.ti.strings.get(*cap)) {
Some(op) => match expand(op, &[], &mut Variables::new()) {
Ok(cmd) => cmd,
Err(e) => return Err(io::Error::new(io::ErrorKind::InvalidData, e)),
},
None => return Ok(false),
};
self.out.write_all(&cmd).and(Ok(true))
}
}
impl<T: Write + Send> TerminfoTerminal<T> {
/// Creates a new TerminfoTerminal with the given TermInfo and Write.
pub(crate) fn new_with_terminfo(out: T, terminfo: TermInfo) -> TerminfoTerminal<T> {
let nc = if terminfo.strings.contains_key("setaf") && terminfo.strings.contains_key("setab")
{
terminfo.numbers.get("colors").map_or(0, |&n| n)
} else {
0
};
TerminfoTerminal { out, ti: terminfo, num_colors: nc }
}
/// Creates a new TerminfoTerminal for the current environment with the given Write.
///
/// Returns `None` when the terminfo cannot be found or parsed.
pub(crate) fn new(out: T) -> Option<TerminfoTerminal<T>> {
TermInfo::from_env().map(move |ti| TerminfoTerminal::new_with_terminfo(out, ti)).ok()
}
fn dim_if_necessary(&self, color: color::Color) -> color::Color {
if color >= self.num_colors && (8..16).contains(&color) { color - 8 } else { color }
}
fn apply_cap(&mut self, cmd: &str, params: &[Param]) -> io::Result<bool> {
match self.ti.strings.get(cmd) {
Some(cmd) => match expand(cmd, params, &mut Variables::new()) {
Ok(s) => self.out.write_all(&s).and(Ok(true)),
Err(e) => Err(io::Error::new(io::ErrorKind::InvalidData, e)),
},
None => Ok(false),
}
}
}
impl<T: Write> Write for TerminfoTerminal<T> {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
self.out.write(buf)
}
fn flush(&mut self) -> io::Result<()> {
self.out.flush()
}
}
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