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use crossterm::{
cursor,
event::{self, Event, KeyCode, KeyModifiers},
execute,
style::{Color, Print, ResetColor, SetForegroundColor},
terminal::{self, Clear, ClearType},
};
use std::time::Duration;
use std::{
error::Error,
io::{self, Write},
};
use crate::common::app_builder::Arbor;
pub struct Repl {
arbor: Arbor,
input: String,
input_section: usize,
selected_suggestion: usize,
}
impl Repl {
pub async fn new() -> Result<Self, Box<dyn Error>> {
Ok(Self {
arbor: Arbor::build().await?,
input: "".to_string(),
input_section: 0,
selected_suggestion: 0,
})
}
pub async fn run(&mut self) -> Result<(), Box<dyn Error>> {
let mut stdout = io::stdout();
terminal::enable_raw_mode()?;
execute!(stdout, terminal::EnterAlternateScreen)?;
loop {
if event::poll(Duration::from_millis(100))? {
if let Event::Key(event) = event::read()? {
match event.code {
KeyCode::Char(' ') => {
if self.input.is_empty() {
continue;
}
self.input.push(' ');
self.input_section += 1;
if self
.input
.chars()
.nth(self.input.len().saturating_sub(2))
.unwrap()
== ' '
{
self.input.pop();
self.input_section -= 1;
}
}
KeyCode::Char('c') if event.modifiers.contains(KeyModifiers::CONTROL) => {
break
}
KeyCode::Char(c) => {
self.input.push(c);
self.selected_suggestion = 0;
}
KeyCode::Backspace => {
if self.input.is_empty() {
continue;
}
let curr = self
.input
.chars()
.nth(self.input.len().saturating_sub(1))
.unwrap();
if curr == ' ' {
self.input_section -= 1;
}
self.input.pop();
self.selected_suggestion = 0;
}
KeyCode::Enter => {
let words = self.input.split(' ').collect::<Vec<&str>>();
for word in words {
// word length must be bigger than 1 character
if word.len() < 2 {
continue;
}
self.arbor
.autocomplete
.insert_word(word.to_string())
.await?;
}
self.input = "".to_string();
self.selected_suggestion = 0;
self.input_section = 0;
}
KeyCode::Up => {
if self.selected_suggestion > 0 {
self.selected_suggestion -= 1;
}
}
KeyCode::Down => {
self.selected_suggestion += 1;
}
KeyCode::Tab => {
if self.input.is_empty() {
continue;
}
if let Some(suggestion) = self
.arbor
.autocomplete
.suggest_word(
self.input
.split(' ')
.collect::<Vec<&str>>()
.get(self.input_section)
.unwrap(),
)
.await?
.get(self.selected_suggestion)
{
let mut words = self.input.split(' ').collect::<Vec<&str>>();
words[self.input_section] = suggestion.as_str();
self.input = words.join(" ");
}
self.selected_suggestion = 0;
self.input.push(' ');
self.input_section += 1;
}
KeyCode::Esc => break,
_ => panic!("Unknown keystroke!"),
}
}
}
let suggestions = self
.arbor
.autocomplete
.suggest_word(
self.input
.split(' ')
.collect::<Vec<&str>>()
.get(self.input_section)
.unwrap(),
)
.await?;
// NOTE: this is to prevent selection overflow
let max_index = suggestions.len().saturating_sub(1);
if self.selected_suggestion > max_index {
self.selected_suggestion = max_index;
}
execute!(stdout, Clear(ClearType::All))?;
execute!(
stdout,
cursor::MoveTo(0, 0),
Print(format!("> {}", self.input))
)?;
for (i, suggestion) in suggestions.iter().enumerate() {
if i == self.selected_suggestion {
execute!(
stdout,
cursor::MoveTo(2, (i + 1) as u16),
SetForegroundColor(Color::Green),
Print(suggestion),
ResetColor
)?;
} else {
execute!(
stdout,
cursor::MoveTo(2, (i + 1) as u16),
SetForegroundColor(Color::DarkGrey),
Print(suggestion),
ResetColor
)?;
}
}
execute!(stdout, cursor::MoveTo(2 + self.input.len() as u16, 0))?;
stdout.flush()?;
}
execute!(stdout, terminal::LeaveAlternateScreen)?;
terminal::disable_raw_mode()?;
Ok(())
}
}