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|
use crate::error::*;
use futures_lite::io::AsyncReadExt as _;
use std::os::unix::io::AsRawFd as _;
use crate::private::Input as _;
pub struct RawGuard {
termios: Option<nix::sys::termios::Termios>,
}
impl RawGuard {
#[allow(clippy::new_without_default)]
pub async fn new() -> Result<Self> {
let stdin = std::io::stdin().as_raw_fd();
let termios = blocking::unblock(move || {
nix::sys::termios::tcgetattr(stdin).map_err(Error::SetRaw)
})
.await?;
let mut termios_raw = termios.clone();
nix::sys::termios::cfmakeraw(&mut termios_raw);
blocking::unblock(move || {
nix::sys::termios::tcsetattr(
stdin,
nix::sys::termios::SetArg::TCSANOW,
&termios_raw,
)
.map_err(Error::SetRaw)
})
.await?;
Ok(Self {
termios: Some(termios),
})
}
pub async fn cleanup(&mut self) -> Result<()> {
if let Some(termios) = self.termios.take() {
let stdin = std::io::stdin().as_raw_fd();
blocking::unblock(move || {
nix::sys::termios::tcsetattr(
stdin,
nix::sys::termios::SetArg::TCSANOW,
&termios,
)
.map_err(Error::UnsetRaw)
})
.await
} else {
Ok(())
}
}
}
impl Drop for RawGuard {
fn drop(&mut self) {
futures_lite::future::block_on(async {
let _ = self.cleanup().await;
});
}
}
pub struct Input {
stdin: blocking::Unblock<std::io::Stdin>,
raw: Option<RawGuard>,
buf: Vec<u8>,
pos: usize,
parse_utf8: bool,
parse_ctrl: bool,
parse_meta: bool,
parse_special_keys: bool,
parse_single: bool,
}
impl crate::private::Input for Input {
fn buf(&self) -> &[u8] {
&self.buf[self.pos..]
}
fn buf_mut(&mut self) -> &mut [u8] {
&mut self.buf[self.pos..]
}
fn buf_mut_vec(&mut self) -> &mut Vec<u8> {
&mut self.buf
}
fn consume(&mut self, n: usize) {
self.pos += n;
}
fn unconsume(&mut self, n: usize) {
self.pos -= n;
}
fn buf_is_empty(&self) -> bool {
self.pos >= self.buf.len()
}
fn buf_at_beginning(&self) -> bool {
self.pos == 0
}
fn should_parse_utf8(&self) -> bool {
self.parse_utf8
}
fn should_parse_ctrl(&self) -> bool {
self.parse_ctrl
}
fn should_parse_meta(&self) -> bool {
self.parse_meta
}
fn should_parse_special_keys(&self) -> bool {
self.parse_special_keys
}
fn should_parse_single(&self) -> bool {
self.parse_single
}
}
#[allow(clippy::new_without_default)]
impl Input {
pub async fn new() -> Result<Self> {
let mut self_ = Self::new_without_raw();
self_.raw = Some(RawGuard::new().await?);
Ok(self_)
}
pub fn new_without_raw() -> Self {
Self {
stdin: blocking::Unblock::new(std::io::stdin()),
raw: None,
buf: Vec::with_capacity(4096),
pos: 0,
parse_utf8: true,
parse_ctrl: true,
parse_meta: true,
parse_special_keys: true,
parse_single: true,
}
}
pub fn parse_utf8(&mut self, parse: bool) {
self.parse_utf8 = parse;
}
pub fn parse_ctrl(&mut self, parse: bool) {
self.parse_ctrl = parse;
}
pub fn parse_meta(&mut self, parse: bool) {
self.parse_meta = parse;
}
pub fn parse_special_keys(&mut self, parse: bool) {
self.parse_special_keys = parse;
}
pub fn parse_single(&mut self, parse: bool) {
self.parse_single = parse;
}
pub fn take_raw_guard(&mut self) -> Option<RawGuard> {
self.raw.take()
}
pub async fn read_key(&mut self) -> Result<Option<crate::Key>> {
self.fill_buf().await?;
if self.parse_single {
self.read_single_key()
} else {
if let Some(s) = self.try_read_string()? {
return Ok(Some(s));
}
if let Some(s) = self.try_read_bytes()? {
return Ok(Some(s));
}
if let Some(key) = self.read_single_key()? {
return Ok(Some(self.normalize_to_bytes(key)));
}
Ok(None)
}
}
async fn fill_buf(&mut self) -> Result<bool> {
if self.buf_is_empty() {
self.buf.resize(4096, 0);
self.pos = 0;
let bytes = read_stdin(&mut self.stdin, &mut self.buf).await?;
if bytes == 0 {
return Ok(false);
}
self.buf.truncate(bytes);
}
if self.parse_utf8 {
let expected_bytes = self.expected_leading_utf8_bytes();
if self.buf.len() < self.pos + expected_bytes {
let mut cur = self.buf.len();
self.buf.resize(4096 + expected_bytes, 0);
while cur < self.pos + expected_bytes {
let bytes =
read_stdin(&mut self.stdin, &mut self.buf[cur..])
.await?;
if bytes == 0 {
return Ok(false);
}
cur += bytes;
}
self.buf.truncate(cur);
}
}
Ok(true)
}
}
async fn read_stdin(
stdin: &mut blocking::Unblock<std::io::Stdin>,
buf: &mut [u8],
) -> Result<usize> {
stdin.read(buf).await.map_err(Error::ReadStdin)
}
|
