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use crate::terminal::decoding::CharBufReader;
use crate::terminal::error::TerminalError;
use nix::sys::termios;
use std::io::Read;
use std::os::unix::io::AsRawFd;
pub mod decoding;
pub mod error;
#[derive(Clone,Debug,Eq,Hash,Ord,PartialEq,PartialOrd)]
struct Point {
x: usize,
y: usize,
}
impl Point {
pub fn new(x: usize, y: usize) -> Point {
Point {
x: x,
y: y,
}
}
}
#[derive(Debug,Eq,PartialEq)]
struct LineBuffer {
lines: Vec<String>,
cursor: Point,
}
impl LineBuffer {
pub fn new() -> LineBuffer {
LineBuffer {
lines: vec![String::new()],
cursor: Point::new(0, 0),
}
}
pub fn insert(&mut self, input: &str) {
let line = &mut self.lines[self.cursor.y];
line.replace_range(self.cursor.x .. self.cursor.x, input);
self.cursor.x += input.len();
}
pub fn backspace(&mut self) {
if self.cursor.x > 0 {
let line = &mut self.lines[self.cursor.y];
line.replace_range(self.cursor.x - 1 .. self.cursor.x, "");
self.cursor.x -= 1;
} else if self.cursor.y > 0 {
let second_line = self.lines.remove(self.cursor.y);
let first_line = &mut self.lines[self.cursor.y - 1];
self.cursor.x = first_line.len();
self.cursor.y -= 1;
first_line.push_str(&second_line);
}
}
}
#[derive(Clone,Debug,Eq,Hash,Ord,PartialEq,PartialOrd)]
enum InputAction {
Backspace,
Execute,
}
pub fn handle_input_terminal(input_stream: impl Read + AsRawFd)
-> std::result::Result<(), TerminalError>
{
let fd = input_stream.as_raw_fd();
let mut termios = termios::tcgetattr(fd)
.map_err(error::mode_setting)?;
termios.local_flags.insert(termios::LocalFlags::ECHO);
termios.local_flags.remove(termios::LocalFlags::ECHOCTL);
termios.local_flags.remove(termios::LocalFlags::ICANON);
termios.control_chars[termios::SpecialCharacterIndices::VMIN as usize] = 1;
termios.control_chars[termios::SpecialCharacterIndices::VTIME as usize] = 0;
termios::tcsetattr(fd, termios::SetArg::TCSANOW, &termios)
.map_err(error::mode_setting)?;
handle_input(input_stream)
}
pub fn handle_input(input_stream: impl Read)
-> std::result::Result<(), TerminalError>
{
let mut reader = CharBufReader::new(input_stream);
let mut line_buffer = LineBuffer::new();
loop {
let mut action: Option<InputAction> = None;
let string = reader.fill_buf().map_err(error::input)?;
let mut chars = string.char_indices();
for (_, c) in &mut chars {
match c {
'\n' => {
action = Some(InputAction::Execute);
}
'\u{7f}' => {
action = Some(InputAction::Backspace);
}
_ => {
line_buffer.insert(&c.to_string());
}
}
if action.is_some() {
break;
}
}
let n_to_consume = match chars.next() {
Some((offset, _)) => offset,
None => string.len(),
};
reader.consume(n_to_consume);
match action {
Some(InputAction::Execute) => {
break;
}
Some(InputAction::Backspace) => {
line_buffer.backspace();
}
None => { }
}
}
println!("line buffer {:?}", line_buffer);
Ok(())
}
#[cfg(test)]
mod tests {
use super::*;
use std::io::Cursor;
#[test]
fn test_empty_input() {
let buffer = Cursor::new(vec![]);
let result = handle_input(buffer);
assert!(result.is_ok());
}
}
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