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terminal.rs
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terminal.rs
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/*!
This module contains an implementation of the `term::Terminal` trait.
The actual implementation is copied almost verbatim from the `term` crate, so
this code is under the same license (MIT/Apache).
The specific reason why this is copied here is to wrap an Arc<TermInfo> instead
of a TermInfo. This makes multithreaded sharing much more performant.
N.B. This is temporary until this issue is fixed:
https://github.com/Stebalien/term/issues/64
*/
use std::io::{self, Write};
use std::sync::Arc;
use term::{Attr, Error, Result, Terminal, color};
use term::terminfo::TermInfo;
use term::terminfo::parm::{Param, Variables, expand};
/// A Terminal that knows how many colors it supports, with a reference to its
/// parsed Terminfo database record.
#[derive(Clone, Debug)]
pub struct TerminfoTerminal<T> {
num_colors: u16,
out: T,
ti: Arc<TermInfo>,
}
impl<T: Write + Send> Terminal for TerminfoTerminal<T> {
type Output = T;
fn fg(&mut self, color: color::Color) -> Result<()> {
let color = self.dim_if_necessary(color);
if self.num_colors > color {
return apply_cap(&self.ti, "setaf", &[Param::Number(color as i32)], &mut self.out);
}
Err(Error::ColorOutOfRange)
}
fn bg(&mut self, color: color::Color) -> Result<()> {
let color = self.dim_if_necessary(color);
if self.num_colors > color {
return apply_cap(&self.ti, "setab", &[Param::Number(color as i32)], &mut self.out);
}
Err(Error::ColorOutOfRange)
}
fn attr(&mut self, attr: Attr) -> Result<()> {
match attr {
Attr::ForegroundColor(c) => self.fg(c),
Attr::BackgroundColor(c) => self.bg(c),
_ => apply_cap(&self.ti, cap_for_attr(attr), &[], &mut self.out),
}
}
fn supports_attr(&self, attr: Attr) -> bool {
match attr {
Attr::ForegroundColor(_) | Attr::BackgroundColor(_) => self.num_colors > 0,
_ => {
let cap = cap_for_attr(attr);
self.ti.strings.get(cap).is_some()
}
}
}
fn reset(&mut self) -> Result<()> {
reset(&self.ti, &mut self.out)
}
fn supports_reset(&self) -> bool {
["sgr0", "sgr", "op"].iter().any(|&cap| self.ti.strings.get(cap).is_some())
}
fn supports_color(&self) -> bool {
self.num_colors > 0 && self.supports_reset()
}
fn cursor_up(&mut self) -> Result<()> {
apply_cap(&self.ti, "cuu1", &[], &mut self.out)
}
fn delete_line(&mut self) -> Result<()> {
apply_cap(&self.ti, "dl", &[], &mut self.out)
}
fn carriage_return(&mut self) -> Result<()> {
apply_cap(&self.ti, "cr", &[], &mut self.out)
}
fn get_ref(&self) -> &T {
&self.out
}
fn get_mut(&mut self) -> &mut T {
&mut self.out
}
fn into_inner(self) -> T
where Self: Sized
{
self.out
}
}
impl<T: Write + Send> TerminfoTerminal<T> {
/// Create a new TerminfoTerminal with the given TermInfo and Write.
pub fn new_with_terminfo(out: T, terminfo: Arc<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: out,
ti: terminfo,
num_colors: nc,
}
}
/// Create a new TerminfoTerminal for the current environment with the given Write.
///
/// Returns `None` when the terminfo cannot be found or parsed.
pub fn new(out: T) -> Option<TerminfoTerminal<T>> {
TermInfo::from_env().map(move |ti| {
TerminfoTerminal::new_with_terminfo(out, Arc::new(ti))
}).ok()
}
fn dim_if_necessary(&self, color: color::Color) -> color::Color {
if color >= self.num_colors && color >= 8 && color < 16 {
color - 8
} else {
color
}
}
}
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()
}
}
fn cap_for_attr(attr: Attr) -> &'static str {
match attr {
Attr::Bold => "bold",
Attr::Dim => "dim",
Attr::Italic(true) => "sitm",
Attr::Italic(false) => "ritm",
Attr::Underline(true) => "smul",
Attr::Underline(false) => "rmul",
Attr::Blink => "blink",
Attr::Standout(true) => "smso",
Attr::Standout(false) => "rmso",
Attr::Reverse => "rev",
Attr::Secure => "invis",
Attr::ForegroundColor(_) => "setaf",
Attr::BackgroundColor(_) => "setab",
}
}
fn apply_cap(ti: &TermInfo, cmd: &str, params: &[Param], out: &mut io::Write) -> Result<()> {
match ti.strings.get(cmd) {
Some(cmd) => {
match expand(cmd, params, &mut Variables::new()) {
Ok(s) => {
try!(out.write_all(&s));
Ok(())
}
Err(e) => Err(e.into()),
}
}
None => Err(Error::NotSupported),
}
}
fn reset(ti: &TermInfo, out: &mut io::Write) -> Result<()> {
// are there any terminals that have color/attrs and not sgr0?
// Try falling back to sgr, then op
let cmd = match [("sgr0", &[] as &[Param]), ("sgr", &[Param::Number(0)]), ("op", &[])]
.iter()
.filter_map(|&(cap, params)| {
ti.strings.get(cap).map(|c| (c, params))
})
.next() {
Some((op, params)) => {
match expand(op, params, &mut Variables::new()) {
Ok(cmd) => cmd,
Err(e) => return Err(e.into()),
}
}
None => return Err(Error::NotSupported),
};
try!(out.write_all(&cmd));
Ok(())
}