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|
use textmode::Textmode as _;
use unicode_width::{UnicodeWidthChar as _, UnicodeWidthStr as _};
pub struct Readline {
size: (u16, u16),
input_line: String,
pos: usize,
}
impl Readline {
pub fn new() -> Self {
Self {
size: (24, 80),
input_line: "".into(),
pos: 0,
}
}
pub async fn render(
&self,
out: &mut textmode::Output,
entry_count: usize,
focus: bool,
offset: time::UtcOffset,
) -> anyhow::Result<()> {
let pwd = crate::env::pwd()?;
let user = crate::env::user()?;
let hostname = crate::env::hostname()?;
let time = crate::env::time(offset)?;
let prompt_char = crate::env::prompt_char()?;
let id = format!("{}@{}", user, hostname);
let idlen: u16 = id.len().try_into().unwrap();
let timelen: u16 = time.len().try_into().unwrap();
out.move_to(self.size.0 - 2, 0);
if focus {
out.set_bgcolor(textmode::Color::Rgb(32, 32, 64));
} else {
out.set_bgcolor(textmode::Color::Rgb(32, 32, 32));
}
out.write(b"\x1b[K");
out.set_fgcolor(textmode::color::YELLOW);
out.write_str(&format!("{}", entry_count + 1));
out.reset_attributes();
if focus {
out.set_bgcolor(textmode::Color::Rgb(32, 32, 64));
} else {
out.set_bgcolor(textmode::Color::Rgb(32, 32, 32));
}
out.write_str(" (");
out.write_str(&pwd);
out.write_str(")");
out.move_to(self.size.0 - 2, self.size.1 - 4 - idlen - timelen);
out.write_str(&id);
out.write_str(" [");
out.write_str(&time);
out.write_str("]");
out.move_to(self.size.0 - 1, 0);
out.reset_attributes();
out.write_str(&prompt_char);
out.write_str(" ");
out.reset_attributes();
out.write(b"\x1b[K");
out.write_str(&self.input_line);
out.reset_attributes();
out.move_to(self.size.0 - 1, 2 + self.pos_width());
if focus {
out.hide_cursor(false);
}
Ok(())
}
pub async fn resize(&mut self, size: (u16, u16)) {
self.size = size;
}
pub fn lines(&self) -> usize {
2 // XXX handle wrapping
}
pub fn input(&self) -> String {
self.input_line.clone()
}
pub fn add_input(&mut self, s: &str) {
self.input_line.insert_str(self.byte_pos(), s);
self.pos += s.chars().count();
}
pub fn set_input(&mut self, s: &str) {
self.input_line = s.to_string();
self.pos = s.chars().count();
}
pub fn backspace(&mut self) {
while self.pos > 0 {
self.pos -= 1;
let width =
self.input_line.remove(self.byte_pos()).width().unwrap_or(0);
if width > 0 {
break;
}
}
}
pub fn clear_input(&mut self) {
self.input_line.clear();
self.pos = 0;
}
pub fn clear_backwards(&mut self) {
self.input_line = self.input_line.chars().skip(self.pos).collect();
self.pos = 0;
}
pub fn cursor_left(&mut self) {
if self.pos == 0 {
return;
}
self.pos -= 1;
while let Some(c) = self.input_line.chars().nth(self.pos) {
if c.width().unwrap_or(0) == 0 {
self.pos -= 1;
} else {
break;
}
}
}
pub fn cursor_right(&mut self) {
if self.pos == self.input_line.chars().count() {
return;
}
self.pos += 1;
while let Some(c) = self.input_line.chars().nth(self.pos) {
if c.width().unwrap_or(0) == 0 {
self.pos += 1;
} else {
break;
}
}
}
fn pos_width(&self) -> u16 {
self.input_line
.chars()
.take(self.pos)
.collect::<String>()
.width()
.try_into()
.unwrap()
}
fn byte_pos(&self) -> usize {
self.input_line
.char_indices()
.nth(self.pos)
.map_or(self.input_line.len(), |(i, _)| i)
}
}
|
