101 lines
3.3 KiB
Rust
101 lines
3.3 KiB
Rust
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/* relish: versatile lisp shell
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* Copyright (C) 2021 Aidan Hahn
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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use rustyline::error::ReadlineError;
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use rustyline::Editor;
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use dirs::home_dir;
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use std::rc::Rc;
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use std::cell::RefCell;
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use relish::ast::{VTable, FTable, Ctr, lex, eval, ast_to_string};
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use relish::stdlib::{get_stdlib};
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fn main() {
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let mut rl = Editor::<()>::new();
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const HIST_FILE: &str = ".relish_hist";
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//const CONFIG_FILE: &str = ".relishrc";
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let mut hist: String = "".to_owned();
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if let Some(home) = home_dir() {
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if let Some(h) = home.to_str() {
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hist = h.to_owned() + HIST_FILE;
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}
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}
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if hist != "" {
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// ignore result. it loads or it doesnt.
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let _ = rl.load_history(&hist);
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}
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let mut vt = Rc::new(RefCell::new(VTable::new()));
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// if we fail to get stdlib we can just use this one
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let mut ft = Rc::new(RefCell::new(FTable::new()));
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match get_stdlib() {
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Ok(f) => ft = f,
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Err(s) => println!("{}", s)
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}
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loop {
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// todo: configurable prompt
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let readline = rl.readline("λ ");
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match readline {
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Ok(line) => {
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rl.add_history_entry(line.as_str());
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match lex(line.as_str().to_owned()) {
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Ok(a) => {
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match eval(a.clone(), vt.clone(), ft.clone(), false) {
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Ok(a) => {
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match a {
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Ctr::Symbol(s) => println!("{}", s),
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Ctr::String(s) => println!("{}", s),
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Ctr::Integer(i) => println!("{}", i),
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Ctr::Float(f) => println!("{}", f),
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Ctr::Bool(b) => println!("{}", b),
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Ctr::Seg(c) => println!("{}", ast_to_string(c.clone())),
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Ctr::None => ()
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}
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},
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Err(s) => {
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println!("{}", s);
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}
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}
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},
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Err(s) => {
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println!("{}", s);
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}
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}
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},
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Err(ReadlineError::Interrupted) => {
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break
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},
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Err(ReadlineError::Eof) => {
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return
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},
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Err(err) => {
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println!("Prompt error: {:?}", err);
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break
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}
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}
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}
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if hist != "" {
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rl.save_history(&hist).unwrap();
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}
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}
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