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use crate::repl::{settings::SessionSettings, Session};
use ansi_term::{Colour, Style};
use rustyline::error::ReadlineError;
use rustyline::Editor;
use std::io::{stdin, stdout, Write};
const VERSION: Option<&'static str> = option_env!("CARGO_PKG_VERSION");
const HISTORY_FILE: Option<&'static str> = option_env!("CLARITY_REPL_HISTORY_FILE");
enum Input<'a> {
Incomplete(char),
Complete(Vec<&'a str>),
}
fn complete_input(str: &str) -> Result<Input, (char, char)> {
let mut forms: Vec<&str> = vec![];
let mut paren_count = 0;
let mut last_pos = 0;
let mut brackets = vec![];
let mut skip_next = false;
let mut in_string = false;
for (pos, character) in str.char_indices() {
match character {
'\\' => skip_next = true,
'"' => {
if skip_next {
skip_next = false
} else {
in_string = !in_string
}
}
'(' | '{' => {
if !in_string {
brackets.push(character);
match (character, paren_count) {
('(', 0) => {
paren_count += 1;
last_pos = pos
}
('(', _) => paren_count += 1,
_ => {}
}
}
}
')' | '}' => {
if !in_string {
match (brackets.pop(), character) {
(Some('('), '}') => return Err((')', '}')),
(Some('{'), ')') => return Err(('}', ')')),
_ => {}
};
if character == ')' {
paren_count -= 1;
if paren_count == 0 {
forms.push(&str[last_pos..pos + 1]);
}
}
}
}
_ => {}
}
}
match brackets.last() {
Some(char) => Ok(Input::Incomplete(*char)),
_ => Ok(Input::Complete(forms)),
}
}
pub struct Terminal {
pub session: Session,
}
impl Terminal {
pub fn new(session_settings: SessionSettings) -> Terminal {
let mut session = Session::new(session_settings);
session.is_interactive = true;
Terminal { session }
}
pub fn load(mut session: Session) -> Terminal {
session.is_interactive = true;
Terminal { session }
}
pub fn start(&mut self) {
println!("{}", green!(format!("clarity-repl v{}", VERSION.unwrap())));
println!("{}", black!("Enter \"::help\" for usage hints."));
println!("{}", black!("Connected to a transient in-memory database."));
let output = match self.session.display_digest() {
Ok(output) => output,
Err(e) => {
println!("{}", e);
std::process::exit(1);
}
};
println!("{}", output);
let mut editor = Editor::<()>::new();
let mut ctrl_c_acc = 0;
let mut input_buffer = vec![];
let mut prompt = String::from(">> ");
editor
.load_history(HISTORY_FILE.unwrap_or("history.txt"))
.ok();
loop {
let readline = editor.readline(prompt.as_str());
match readline {
Ok(command) => {
ctrl_c_acc = 0;
input_buffer.push(command);
let input = input_buffer.join(" ");
match complete_input(&input) {
Ok(Input::Complete(forms)) => {
let output = self.session.handle_command(&input);
for line in output {
println!("{}", line);
}
prompt = String::from(">> ");
self.session.executed.push(input.to_string());
editor.add_history_entry(input);
input_buffer.clear();
}
Ok(Input::Incomplete(str)) => {
prompt = format!("{}.. ", str);
}
Err((expected, got)) => {
println!("Error: expected closing {}, got {}", expected, got);
prompt = String::from(">> ");
input_buffer.pop();
}
}
}
Err(ReadlineError::Interrupted) => {
ctrl_c_acc += 1;
if ctrl_c_acc == 2 {
break;
} else {
println!("{}", yellow!("Hit CTRL-C a second time to quit."));
}
}
Err(ReadlineError::Eof) => {
println!("CTRL-D");
break;
}
Err(err) => {
println!("Error: {:?}", err);
break;
}
}
}
editor
.save_history(HISTORY_FILE.unwrap_or("history.txt"))
.unwrap();
}
}
